JP2006037674A - Jet nozzle device and its control means - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet nozzle device capable of securely operating a reverse injection mechanism when certain loads are applied to a socket and a nozzle body and to provide its control means. <P>SOLUTION: This jet nozzle device is composed of the nozzle body 30 having an injection port 23 and a passage 31 for jet water and having a reverse injection port 32 communicating with the passage 31 in a section different from the injection port 23 and opened outward and the cylindrical socket 20 for attaching the nozzle body 30. A channel 21 is constituted by matching it with an opening part of the reverse injection port 32 on the inner peripheral face of the socket 20. A socket injection port 33 communicating with the channel 21 is constituted. When attaching the socket 20 to a pile 10, the socket injection port 33 is closed by the pile 10, and the socket injection port 33 is opened when the socket 20 drops from the pile 10 to inject jet water. At the same time, an amount of the discharge water of a pump 50 is kept at a proper amount by a pressure sensor 52 for detecting the reduction of the discharge pressure of the pump 50 and a control part 53. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a jet nozzle device that is used by being attached to a pile such as a steel sheet pile that is press-fitted into the ground and jets jet water to the ground and its control means.

  Conventionally, when a pile such as a steel sheet pile is press-fitted into the ground, depending on the condition of the ground, a jet nozzle device is attached to the pile, and high pressure jet water is injected from the tip of this jet nozzle device to the ground. It was.

A conventional jet nozzle device used in this construction method is shown in FIG. 4, and a socket 120 is fixed near the tip of a pile 110 to be press-fitted by means such as welding. The socket 120 attaches the nozzle body 130 to the pile 110, and the nozzle body 130 is inserted from a cylindrical upper part.
The nozzle body 130 includes a jet water passage 131 therein, and four reverse injection ports 133 are formed in the lower portion of the passage 131. The lower end portion of the passage 131 includes an injection port 123 for jetting jet water. ing.

  The nozzle body 130 is attached to the socket 120 by fixing the nozzle body 130 and the socket 120 by press-fitting the shear pin 122 into the engagement groove 134 provided in the nozzle body 130 from the pin hole of the socket 120.

  When the jet nozzle device having the above-described configuration is used, jet water passing through the passage 131 is jetted from the jet port 123 at the lower end of the passage to excavate the ground. At this time, when the shear pin 122 is broken for some reason, the nozzle body 130 rapidly rises due to the pressure of the jet water and is separated from the socket 120, thereby opening the reverse injection port 133.

Since a part of jet water is thereby discharged from the reverse injection port 133, the pressure of the jet water jetted from the jet port 123 is drastically lowered, and the hose (not shown) is prevented from jumping upward. is there. For this reason, there is an advantage that safety can be ensured without the nozzle body 130 being largely scattered or jumping around.
Japanese Patent No. 2756664

In the conventional example described above, when some load is applied to the nozzle body 130 during the press-fitting of the pile, the shear pin 122 is broken, so that part of the jet water is discharged from the reverse injection port 133, and the nozzle body 130. The runaway was prevented.
However, if the shear pin 122 does not break when some load is applied to the nozzle body 130, the socket 120 may come off from the pile 110 together with the nozzle body 130. In this case, the reverse injection function does not work, so the nozzle body 130 and the hose were out of control and it was very dangerous.

  The present invention has been made in view of the above points, and provides a jet nozzle device capable of reliably operating a reverse injection mechanism when a load is applied to a socket or a nozzle body, and a control unit thereof. is there.

The gist of the present invention is that a reverse injection port having an injection port for jetting water and a passage communicating with the injection port and communicating with the passage at a portion different from the injection port and opening outward. A nozzle body and a cylindrical socket to which the nozzle body is attached,
A groove is formed on the inner peripheral surface of the socket in accordance with the opening of the reverse injection port, and a socket injection port that is open to the outside in communication with the groove is formed. The mouth is sealed by a pile, and when the socket is dropped from the pile, the socket injection port is opened to jet jet water.

  Further, the gist of the present invention is that a pressure sensor for detecting a decrease in the discharge pressure of the pump accompanying jet water injection from the socket injection port or the reverse injection port of the nozzle body, and control based on the command of the pressure sensor The control unit of the jet nozzle device ensures safety by controlling the number of rotations of the motor of the pump or reducing the discharge amount of the pump.

  Since the present invention is configured as described above, when a load is applied to the socket or the nozzle body, the reverse injection mechanism is reliably operated even when the socket is detached from the pile without breaking the lock pin, The effect is that the pressure drop of the pump is detected and controlled to an appropriate amount of water to prevent the runaway of the nozzle body and hose.

The best mode for carrying out the present invention has a jet port for jetting jet water and a passage communicating with the jet port, and communicates with the passage at a portion different from the jet port and opens outward. It consists of a nozzle body with a reverse injection port and a cylindrical socket to which this nozzle body is attached.
A groove is formed on the inner peripheral surface of the socket in accordance with the opening of the reverse injection port, and a socket injection port that communicates with the groove and opens outward is configured.
When the socket is attached to the pile, the socket outlet is sealed by the pile, and when the socket falls off the pile, the socket outlet opens to inject jet water, and at the same time, detects a decrease in pump discharge pressure. It is to keep the discharge water amount of the pump appropriate by the control unit.

FIG. 1 is a sectional front view showing an embodiment of the jet nozzle device of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 shows an embodiment of the control means of the jet nozzle device of the present invention. It is a systematic diagram.
The jet nozzle device of the present embodiment is shown in FIG. 1, and one side surface of the socket 20 is fixed near the tip of the pile 10 to be press-fitted by means such as welding. The socket 20 attaches the nozzle body 30 to the pile 10 and inserts the nozzle body 30 from the cylindrical upper opening.

On the inner peripheral surface of the socket 20, a groove 21 is cut in accordance with an opening 32a of a reverse injection port 32 of a nozzle body 30 described later. The groove 21 is annularly provided over the entire inner peripheral surface of the socket 20, and a part of the groove 21 communicates with the socket injection port 33.
The socket outlet 33 is open outward, but when the socket 20 is attached to the pile 10 as shown, the opening of the socket outlet 33 is attached to the pile 10 in a sealed state. Yes.

  The nozzle body 30 includes a jet water passage 31 therein, and four lower injection ports 32 that are open outwardly are formed in the lower portion of the passage 31. An ejection port 23 for ejecting jet water is provided. A hose 40 is connected to the upper end of the nozzle body 30. In the figure, 35 is a seal.

  The nozzle body 30 is attached to the socket 20 by press-fitting the lock pin 22 from the pin hole of the socket 20 into an engaging groove 34 provided in the lower portion of the nozzle body 30.

When the jet nozzle device having the above-described configuration is used, jet water passing through the passage 31 from the hose 40 is jetted from the jet port 23 at the lower end of the passage to excavate the ground.
At this time, when the socket 20 or the nozzle body 30 is subjected to some load, the socket 20 is unwelded, the lock pin 22 is not broken, and the socket 20 and the nozzle body 30 are separated from the pile 10. The socket injection port 33 sealed by the surface is opened.
As a result, a part of the jet water is discharged upward from the socket injection port 33, so that the pressure of the jet water injected from the injection port 23 rapidly decreases, and the hose 40 is prevented from jumping upward. For this reason, the runaway such as the nozzle body 30 and the socket 20 greatly splashing around or jumping off can be prevented, and safety can be ensured.

The control process of said jet nozzle apparatus is demonstrated based on FIG.
As described above, when the socket 20 is separated from the pile 10, jet water is jetted from the jet port 23, and at the same time, from the reverse jet port 32 of the nozzle body 30 to the outside of the socket jet port 33 through the groove 21 of the socket 20. Is injected into.
As a result, the reverse injection function works on the nozzle body 30 and simultaneously the discharge pressure of the pump 50 decreases. Therefore, the pressure fluctuation is detected by the pressure sensor 52 and the detection result is sent to the control unit 53.

  When the control unit 53 is inputted in advance with respect to pressure fluctuations and the discharge force of the pump 50 reaches a constant pressure, the controller 53 issues a command to control the pump 50 to reduce the discharge amount, or the pump 50 The operation motor 51 is controlled to issue a command to reduce its rotation speed, so that the discharge water amount of the pump 50 can be automatically reduced to the minimum flow rate and the safety can be ensured against the pressure fluctuation. It is.

  As described above, according to the above-described embodiment, the reverse injection mechanism can be reliably operated when a load is applied to the socket or the nozzle body, and the runaway of the nozzle body, the hose, etc. It is possible to keep the discharge water amount of the pump properly.

Sectional front view which shows one Example of the jet nozzle apparatus of this invention AA line sectional view of FIG. System diagram showing an embodiment of the control means of the jet nozzle device of the present invention Cross-sectional front view of a conventional jet nozzle device

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pile 20 Socket 21 Groove 22 Lock pin 23 Injection port 30 Nozzle body 31 Passage 32 Reverse injection port 33 Socket injection port 34 Engagement groove 35 Seal material 40 Hose 50 Pump 51 Motor 52 Pressure sensor 52 Control part

Claims (2)

Nozzle body having a jet port for jetting jet water and a passage communicating with the jet port, and having a reverse jet port communicating with the passage and opening outward at a portion different from the jet port, and the nozzle body Consists of a cylindrical socket to which
A groove is formed on the inner peripheral surface of the socket in accordance with the opening of the reverse injection port, and a socket injection port that communicates with the groove and opens outward is configured.
A jet nozzle device characterized in that when a socket is attached to a pile, the socket injection port is sealed by the pile, and when the socket is dropped from the pile, the socket injection port is opened and jet water is injected.   A pressure sensor that detects a decrease in the discharge pressure of the pump due to jet water jet from the socket injection port or the reverse injection port of the nozzle body, and the control unit based on the command of this pressure sensor, the rotation speed of the pump motor Control means for the jet nozzle device that ensures safety by controlling or reducing the discharge amount of the pump.

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