JPH0624090U - Signal transmission equipment for machinery operating in water - Google Patents

Abstract

(57) [Abstract] [Purpose] To enable reliable wireless signal transmission using water as a medium between a mechanical device that operates underwater in a drill hole and the ground side. [Configuration] Bottom expanding bit 20 → Kelly bar 13 → Wire rope 12 Earth line of earth drill machine 10 and transmitter 32 → Transmitting antenna 33 → Liquid water 2 → Stand pipe 3
→ A wireless loop of the receiver 15 is formed, and a signal current is sent from the transmitter 32 side in the underground. In this way, by using the standpipe 3 provided for reinforcement around the excavation hole as a receiving antenna instead of the conventional underwater antenna on the ground side, reliability not affected by generation of bubbles, turbulent flow, water quality, etc. Realizes highly reliable signal transmission. In addition, the signal current at this time is modulated at a specific frequency, so that the signal current can be easily distinguished from a noise current flowing in the ground and the reliability is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a signal transmission device used for wirelessly transmitting a signal for monitoring or the like between a ground side and an underwater side in a mechanical device that operates underwater in a drill hole, such as a bottom drilling device. Is.

[0002]

[Prior art]

 Conventionally, as a technique of this kind, there is Japanese Utility Model Publication No. 62-7746 by the present applicant. In this conventional technology, a transmitter and an underwater transmitting antenna are placed on a bottom expanding bit that performs bottom expanding excavation at the bottom of a pile hole filled with muddy water, and a receiving antenna is dropped from the receiver on the ground side into the water, during which a weak A signal current was passed to transmit a detection signal of the operating state of the bottom expanding bit in mud to the receiver, aiming to standardize the excavation work process and to ensure the accuracy of the work.

[0003]

[Problems to be solved by the device]

 However, the signal transmission by the above-mentioned conventional underwater receiving antenna is affected by the underground current (noise), the generation of bubbles in the drill hole, the turbulence due to the water flowing from the makeup water inlet, the quality of muddy water, etc. Due to the influence, the current flowing in the water was not constant and sometimes the signal could not be received, which made reliable signal transmission impossible.

The present invention has been made in order to solve the above problems, and an object thereof is to achieve high reliability by using water as a medium between a mechanical device that operates in water in a drilling hole and the ground side. It is an object of the present invention to provide a signal transmission device that enables wireless signal transmission.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in the signal transmission device for a mechanical device operating underwater of the present invention, one of the transmitter and the receiver is arranged on the ground side, and the transmitter and the receiver are connected to each other. The other of them is arranged in a mechanical device that operates in water in a drill hole, and one end of a transmission output terminal of the transmitter and one end of a reception input terminal of the receiver are configured from the ground side to underwater. Connect the other end of the transmission output terminal or the reception input terminal of one of the transmitter and the receiver to the casing that surrounds the drilled hole, and transmit the other of the transmitter and the receiver. The other end of the output terminal or the receiving input terminal is connected to an underwater antenna, and the signal current is modulated at a specific frequency that can be easily distinguished from the noise current from the transmitter by using water as a medium between the underwater antenna and the casing. Sour the above It is characterized by performing transmission of the signals to the vessel.

[0006]

[Action]

 In the signal transmission device for a mechanical device operating underwater of the present invention, a transmitter → an underwater antenna (or casing) → water → a casing (or an underwater antenna) → a receiver → a conductive component of the mechanical device → a transmitter A wireless loop is formed, and a signal current is sent from the transmitter side. In this way, by using the casing provided for reinforcement around the excavation hole instead of the conventional underwater antenna on the ground side, reliable signal transmission that is not affected by the generation of bubbles, turbulence, water quality, etc. To be realized. In addition, the signal current at this time can be easily distinguished from noise current flowing in the ground by modulating it at a specific frequency, thus improving reliability.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing the configuration of an embodiment of the present invention. This embodiment is an application example of a bottom expanding excavator that performs bottom expanding excavation of a pile hole by the earth drilling method. In the figure, 1 is a pile hole, which is filled with liquid water 2 such as bentonite liquid. The liquid water 2 forms a water blocking film on the side wall of the pile hole 1 to prevent the side wall from collapsing due to the hydrostatic pressure of the liquid water 2. In addition, 3 is a stand pipe of several meters that is inserted from the ground side of the pile hole 1 and constitutes a reinforcing casing that surrounds the pile hole. Since the surface layer easily collapses, several meters of underground pipe from the ground side of the pile hole 1 It prevents the collapse of the sediment up to the side.

The bottom expanding digging device includes an earth drill machine 10 and a bottom expanding bit 20. In the earth drill machine 10, a crane section 11 is provided with a kelly bar 13 made of a hollow square pipe or a pipe with a key groove so that it can be lifted and lowered by a wire rope 12, and a bottom expanding bit 20 is coupled to the lower end of the kerry bar 13. Has been done. Further, the earth drill machine 10 has a power swivel 14, and the kelly bar 13 is loosely inserted into the power swivel 14 to move up and down and rotated by the power swivel 14. Further, the earth drill machine 10 is provided with a receiver 15, a receiver monitor 16 and a battery 17 for supplying power to these, which constitute the signal transmission device of this embodiment.

2A, 2B, and 2C are views showing details of the bottom expanding bit 20, where FIG. 2A is a front view showing a state before the start of bottom expanding, and FIG. 2B is a side view thereof. , (C) are side views showing the bottom expanded state. In the figure, reference numeral 21 denotes a drive pipe, which is spline-fitted to a body pipe 22 so as to be slidable in the axial direction and capable of transmitting a rotational force. A crosshead 23 is provided at the upper end of the drive pipe 21, and the tip of the crosshead 23 is fitted into the socket at the lower end of the kelly bar 13 shown in FIG. 1 and fixed by a pin. A stabilizer 24 for stabilizing the posture in the pile hole 1 is provided at the upper portion of the body pipe 22, and a bucket 25 for accommodating the earth and sand excavated from the bottom is provided at the lower portion. Two plate-shaped guides 26 are fixed around the body pipe 22 from the lower portion of the stabilizer 24 to the inside of the bucket 25 with a required inclination in a direction in which they face each other and cross each other. Each of the guides 26 is provided with a wing expanding bit 27 for expanding the bottom, one by one being slidable up and down. Each of the expanding blade bits 27 is connected to a crosshead 23 above the drive pipe 21 via a support rod 28. As a result, when the drive pipe 21 moves downward in the body pipe 22, each expanding blade bit 27 also slides downward along the inclination of the guide 26, so that the diameter of excavation increases in proportion to the downward movement. Has become. The bucket 25 is provided with a cutout portion for protruding when the expanding blade bit 27 moves downward. The notch has a structure that prevents the outflow of earth and sand in the bucket 25 by closing the shutter by rotating the shutter when the expanding blade 27 moves upward and rotates counterclockwise.

Next, the bottom expanding bit 20 is provided with a position detector 31, a transmitter 32, a transmitting antenna 33, a battery 34, etc., which constitute a signal transmitting device, in order to grasp the bottom excavation state on the ground side. The stabilizer 24 is provided at or near the stabilizer 24. As shown in the sectional view of FIG. 3, the position detector 31 has a structure in which a wire rope 31a is wound around a wire drum 31c having a built-in spring 31b, and the shaft of the wire drum 31c is housed in a watertight casing 31f. The rotary encoder 31d is connected. The tip of the wire rope 31a is connected to the crosshead 23 of FIG. 2. In the state of FIGS. 2 (a) and 2 (b), the wire rope 31a is pulled out, and as the expanding blade 27 moves downward, it is pulled in reverse. 2 (c) to 2 (a) and 2 (b), it is pulled out again when returning to its original state. During this time, when the wire rope 31a is pulled in or pulled out, the shaft of the wire drum 31c in FIG. 3 rotates, and the rotary encoder 31d interlocks with the pulling out or pulling in of the wire rope 31a and outputs a pulse signal indicating the direction of rotation. Output. This pulse signal output is connected to the oscillator 32 of FIG. 2 via a waterproof connector 31e. The transmitter 32 operates on a battery 34, the transmission output of which is connected to a transmission antenna 33. The transmitter 32 and the battery 34 are housed and mounted in a watertight casing. As the position detector, a potentiometer, a synchro motor or the like may be used instead of the rotary encoder, and the rotation angle of the wire drum may be extracted as a current change or a voltage change instead of a pulse signal. In this case, signal transmission is performed by performing analog-digital conversion.

Next, a block diagram of FIG. 4 shows a configuration of a signal transmission device which is a main part of the present embodiment. In the figure, 31 is a position detector, 32 is a transmitter, and 33 is a transmitting antenna, which have been described above. Reference numeral 35 is a magnet sensor or limit switch for detecting the state of FIGS. 2 (a) and 2 (b), that is, the state where the expanding blade 27 has moved upward. A magnet is installed at the position. The above are the components of the pile hole in water, that is, the underground part.

The oscillator 32 includes a pulse train converter 32a including a microcomputer (microcomputer), a pulse modulator 32b, a carrier frequency oscillator 32c, and an amplifier 32d. The detection signal of the magnet sensor 35 and the detection signal (pulse signal) of the position detector 31 are input to the pulse train converter 32a, the origin of the wire rope is detected by the detection signal of the magnet sensor 35, and the position detector is detected from there. The detected signal of 31 is added or subtracted according to the rotation direction of the wire drum to calculate the position of the expanding bit 27 of FIG. 2, this position information is coded and converted into a pulse train, and is output to the modulator 32b as serial data. Output. The carrier of the two frequencies used for pulse modulation is output from the carrier frequency oscillator 32c to the modulator 32b. The pulse train modulated by the pulse modulator 32b is amplified by the amplifier 32d and output to the transmitting antenna 33. Here, one end of the output of the amplifier 32d is connected to 20 expanded bottom bits as ground.

Next, as a ground component of the signal transmission device, 3 is a stand pipe, 15 is a receiver, and 16 is a receiver monitor, which are as described above. The receiver 15 includes an amplifier 15a, a filter circuit 15b, a signal discriminator 15c, and a bottom expansion status display unit 15d. The input of the amplifier 15a is electrically connected to the stand pipe 3 whose one end acts as a receiving antenna and the other end is electrically connected to the earth drill machine 10, and outputs the output signal from the oscillator 32 propagating as a weak current in water. The signal is amplified and output to the filter circuit 15b. The filter circuit 15b takes out only the modulated signal and passes it to the signal discriminator 15c. The signal discriminator 15c demodulates a necessary pulse train and outputs it to the bottomed state display unit 15d. The bottom expansion status display unit 15d is composed of a microcomputer, etc., and decodes the above-mentioned pulse train to obtain position information of the blade expansion bit, determines the progress of the bottom expansion status from this, creates display information, and sends it to the receiver monitor 16. Output and display.

The operation and action of the embodiment configured as described above will be described.

The bottom expanding bit 20 in the present embodiment is suspended from the pile hole 1 previously drilled as a shaft hole, and when the tip of the bottom expanding bit 20 lands, the blade expanding bit 27 is rotated by the power swivel 14 to perform bottom expanding drilling. . The expanding blade bit 27 moves downward together with the crosshead 23 as the bottom is excavated, and the wire rope 31a of the position detector 31 is rewound by the spring 31b and drawn into the wire drum 31c. Here, the degree of bottom expansion digging is interlocked with the downhill position of the blade expansion bit 27, that is, the upper and lower positions in the axial direction of the crosshead 23, that is, the expansion / contraction length of the wire rope 31a. Therefore, in this embodiment, this position information is wirelessly transmitted from the transmitter 33 in the underground to the receiver 15 in the ground by flowing a signal current using water as a medium.

The position information of the bottom expansion bit indicating the bottom expansion condition is calculated by the pulse train converter 32a taking in the origin detection signal from the magnet sensor 35 and the detection signal (pulse signal) from the position detector 31, and calculating the position information. The position information is converted into a pulse train and output as serial data. Therefore, a large number of magnet sensors can be arranged for position detection. The modulator 32b superimposes the carrier frequency on this and performs pulse modulation. As an example of the pulse train, as shown in FIG. 5, a long pulse P is followed by data bits D1, D2, D3 at equal intervals between a high (H) level start pulse S and a low (L) level stop pulse E. , D4, D5 are set to H level if there is a bit, and set to L level if there is no bit, and a long pulse P is added to this to make one set, which is repeatedly output. In the modulator 32b, a carrier frequency of, for example, 5 kHz is superimposed on the H level of the pulse train, and a carrier frequency of, for example, 3 kHz is superimposed on the L level to perform pulse modulation. This modulated signal is amplified and discharged from the transmitting antenna 33.

The signal transmission is performed wirelessly by a weak current flowing through the water between the bottom expansion bit 20 → the kelly bar 13 → the wire rope 12 → the earth drill machine 10 and the earth line connecting the transmitting antenna 33 → the stand pipe 3. The transmitter 15 on the ground receives the weak current propagating through the water and first amplifies the whole. Next, in order to distinguish it from other noise signals, only the carrier frequency discharged in water is taken out by the filter circuit 15b, and this signal is further amplified and rectified by the signal discriminating unit 15c. The pulse train is demodulated and reproduced. This is taken into the bottom expansion status display portion 15d, and the progress of the bottom expansion status is judged and displayed on the receiver monitor 16.

As described above, in the present embodiment, by using the stand pipe 3 for reinforcing the pile hole 1 as the receiving antenna on the ground side, a lot of bubbles are generated in the pile hole 1 and turbulent flow is generated. Even if the current flowing in the water 2 is not constant, the weak current can be stably received. In addition, as a result of actual measurement, a signal current of about 2 to 10 kHz is the best and can be distinguished from noise such as underground current. If the carrier frequency for modulation is selected within that range, more reliable data transmission is performed. be able to. However, it is not particularly limited to this frequency.

Although the above-mentioned embodiment has been described as an application example to the earth drill method, it is shown in the all-casing method of excavating the pile hole while embedding the casing up to the support layer of the bottom expanding bit, and JP-B-62-7746. Of course, it can also be applied to bottom expanding bits by the reverse method. Furthermore, it is also obvious that it can be widely used in other mechanical devices that operate in water. At this time, it is also possible to use a mode in which the above-ground part is the transmitting side and the underwater part is the receiving side, and the control signal of the above-ground part is received in the underground part to operate the mechanical device. is there. As described above, the present invention can be applied in various ways in accordance with its gist and can take various embodiments.

[0021]

[Effect of device]

 As is clear from the above description, according to the present invention, it is possible to perform stable and reliable wireless signal transmission between a mechanical device operating underwater such as a drill hole and the ground side. .

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

2A is a front view showing details of a bottom expanding bit of the above embodiment, FIG. 2B is a side view thereof, and FIG. 2C is a view showing its expanded state.

FIG. 3 is a sectional view of a position detector used in the above embodiment.

FIG. 4 is a block configuration diagram of a signal transmission device that is a main part of the above embodiment.

FIG. 5 is a diagram showing a pulse train for explaining the operation of the signal transmission device.

[Explanation of symbols]

 1 ... Pile hole 2 ... Liquid water 3 ... Stand pipe 10 ... Earth drill machine 13 ... Kelly bar 15 ... Receiver 31 ... Position detector 32 ... Transmitter 33 ... Transmission antenna

Claims (1)

[Scope of utility model registration request] 1. One of the transmitter and the receiver is arranged on the ground side, and the other of the transmitter and the receiver is arranged on a mechanical device operating in the water in the borehole, and the transmitter transmits the signal. One end of the output terminal and one end of the reception input terminal of the receiver are connected to a constituent member of the mechanical device that extends from the ground side into the water, and one of the transmitter and the receiver has a transmission output terminal or a reception input terminal. Between the underwater antenna and the casing, and the other end of the transmitter and the receiver is connected to the underwater antenna. A signal for a mechanical device operating in water, characterized in that a signal current modulated at a specific frequency easily distinguishable from a noise current is sent from the transmitter using water as a medium to transmit the signal to the transmitter. Transmission equipment.