JP2660907B2 - Jet nozzle device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet nozzle device which is attached to a pile to be driven and jets jet water to the ground.

[0002]

2. Description of the Related Art When a pile is driven into a hard ground or the like, a method is used in which a jet nozzle is attached to the pile and high-pressure jet water is jetted from the jet nozzle to the ground. FIG.
Shows the mounting structure of the jet nozzle used in this method.

Reference numeral 1 denotes a pile made of steel sheet pile, which is gripped by a chuck (not shown) of a pile press-in / draw-out machine, and is driven into the ground by descending the chuck. The jet nozzle 90 is fixed to the stake 1 so that the injection port faces downward.

The jet nozzle 90 is fixed by forming a circumferential groove on the outer surface of the nozzle socket 91 and fitting a band 92 into the circumferential groove. The band 92 is made of a metal plate bent so as to have the same curvature as the circumferential groove. The band 92 is fitted to the circumferential groove of the nozzle socket 91 and both ends 93, 93 are welded to the side surface of the pile 1. Then, the jet nozzle 90 is attached to the pile 1.

[0005]

By the way, when the pile is driven, impacts, vibrations, etc. act on the band 92 and a reaction force at the time of jetting the high-pressure jet water acts. May come off. This band 92
The jet nozzle 90 also comes off the pile 1 due to the falling of the jet nozzle, and the jet nozzle 90 and the pipes and hoses connected to the jet nozzle 90 jump up due to the high pressure of the jet water being jetted, and fall to the ground as it is. There is a risk. That is, in the case of a pipe, a pipe with a length of 10 m or more soars like a rocket and falls to the ground. In the case of a hose, the tip of the hose that has jumped out to the ground is rampant by the power of the jet. In each case, they collided with nearby people or machines, causing serious accidents.

The present invention has been made in view of the above circumstances, and has a structure capable of ensuring safety so that a jet pipe or a jet hose does not jump out of the ground even if it comes off a pile. The purpose is to provide.

[0007]

According to the present invention, there is provided a jet nozzle apparatus comprising: a nozzle body having a jet for jetting jet water; a passage communicating with the jet ;
It consists of a mounting member that is inserted and held and fixed to the driving pile.
Serial nozzle body has a relief hole for the passage and communicating, this
The relief hole is opened to the part held by the mounting member,
By using the attachment member as a plug,
The escape hole is sealed by holding the plug with a material.
It is characterized by being chained .

[0008]

In the above construction, when the nozzle body falls off from the mounting member , the relief hole of the nozzle body is opened. Since the escape hole communicates with the jet water passage, a part of the jet water jetted from the injection port is discharged from the escape hole.
As a result, the jet pressure of the jet water is reduced, and scattering of the nozzle body and its peripheral members can be prevented.

[0009]

1 and 2 show a first embodiment of the present invention.
Reference numeral 1 denotes a pile such as a steel sheet pile, an H steel sheet pile, etc., which is gripped by a chuck of a pile press-in / draw-out machine and is driven into the ground by lowering the chuck. An attachment member 2 is attached to a portion (upper portion) of the pile 1 that is extracted from the ground. The mounting member 2 has a cylindrical shape with upper and lower surfaces opened, and its outer surface is fixed to the pile 1 by appropriate means such as welding or bolting.
The mounting member 2 is for mounting the nozzle body 4 to the pile 1, and the nozzle body 4 is inserted into the mounting member 2 from the upper surface.

The nozzle body 4 has a jet port 4a for jetting high-pressure jet water at its lower end, and the jet port 4a.
A jet water passage 4b communicating with a is formed in the axial direction. Reference numeral 5 denotes a nozzle pipe connected to the upper portion of the nozzle body 4 by screwing, welding, or the like, and is connected to a pressurizing source such as a pump and a water supply source (both not shown). In such a structure, the jet water from the nozzle pipe 5 passes through the passage 4b of the nozzle body 4, and is jetted toward the ground from the jet port 4a.

The nozzle body 4 is mounted on the mounting member 2 by forming an engaging groove 6 such as a circumferential groove in the nozzle body 4 and forming a pin hole in a corresponding portion of the mounting member 2.
This is performed by press-fitting the shear pin 7 into this pin hole. The shear pin 7 is pressed into the pin hole of the mounting member 2 by hitting with a hammer or the like, and the tip portion engages with the engagement groove 6 by this press-fitting, whereby the nozzle body 4 is fixed to the mounting member 2. The shear pin 7 is easily broken when a load greater than the allowable value is applied. By utilizing this characteristic, the removal of the nozzle body 4 and the securing of emergency safety are performed.

That is, the nozzle body 4 is removed by applying a pulling force or the like to the nozzle body 4 to break the shear pin 7 and release the connection between the nozzle body 4 and the mounting member 2.

On the other hand, security in an emergency is ensured by the following structure. Reference numeral 8 denotes a relief hole formed in the nozzle main body 4, which is provided in a direction orthogonal to the axial direction of the nozzle main body 4. The relief hole 8 communicates with the passage 4b, but is provided at a location separate from the injection port 4a. In addition, the escape hole 8 is normally closed by the mounting member 2, but is provided at a portion which is easily exposed from the mounting member 2 by breaking the shear pin 7 and releasing the restraint of the nozzle body 4.

With such a structure, the pile can be driven while high-pressure jet water is being sprayed. If the shear pin 7 is broken for any reason during the driving, the mounting member is urged by the pressure of the jet water. The force rising from 2 acts on the nozzle body 4. As a result, the nozzle body 4 is attached to the mounting member 2.
And the relief hole 8 is opened (see FIG. 2). When the escape hole 8 is opened, a part of the jet water is released from the escape hole 8, so that the pressure of the jet water jetted from the jet port 4a drops rapidly. Therefore or scattered large nozzle body 4 and the nozzle pipe 5 is around, prevents splashing jump, it is possible to ensure safety
You.

FIGS. 3 to 5 show modified examples of this embodiment. In FIG. 3, the plug 9 is the escape hole 8 of the nozzle body 4.
It is fitted in. Reference numeral 10 denotes a seal ring such as an O-ring inserted on the outer surface of the plug 9 and the inner surface of the escape hole 8. In this structure, the jet water in the passage 4 b of the nozzle body 4 is blocked by the plug 9 and the seal ring 10, so that the jet water does not leak from the escape hole 8. On the other hand, when the escape hole 8 is exposed from the attachment member 2 due to the detachment of the attachment member 2 from the pile 1 or the breakage of the shear pin 7, the plug 9 and the seal ring 10 are moved from the escape hole 8 by the pressure of the jet water in the passage 4 b. It is pushed out and the escape hole 8 is opened. In this way, emergency safety can be ensured.

FIG. 4 shows that the seal ring 10 is disposed around the escape hole 8 and inserted between the outer surface of the nozzle body 4 and the inner surface of the mounting member 2. Leakage can be prevented. FIG. 5 shows the plug 9 with the escape hole 8
It also prevents jet water from leaking out.

FIGS. 6 and 7 show a second embodiment of the present invention. In this embodiment, a band 11 is used as an attachment member for attaching the nozzle body 4 to the pile 1. The band 11 is made of metal, and is connected to the nozzle body 4 by being fitted to the nozzle body 4. For this reason, a circumferential groove 12 is formed on the outer surface of the nozzle body 4, while a cylindrical portion 11 b that fits into the circumferential groove 12 is formed on the band 11. In the band 11, the nozzle body 4 is attached to the pile 1 by welding both ends 11a to the pile 1 in this fitted state.

Also in this embodiment, a relief hole 8 is formed in the nozzle body 4. Further, the plug 9 around which the seal ring 10 is wound is fitted into the escape hole 8 to be closed. The band 11 closes the escape hole 8 from the outside, and jet water is jetted only from the jet port 4a in normal times. On the other hand, the band 11 breaks for some reason,
When the band 11 falls off the pile 1, the band 11 comes off the nozzle body 4 and the blockade is released. And passage 4
The plug 9 is pushed out by the pressure of the jet water in b, and a part of the jet water is discharged from the escape hole 8. As a result, the pressure of the jet water injected from the injection port 4a is reduced, so that safety can be ensured.

[0019]

According to the present invention, a relief hole is formed in the nozzle body,
To the nozzle main body is constituted from the hole escape by falling off from the mounting member to release the jet water, even if falling from the mounting member of the nozzle body, the pressure of jet water injected from the injection port is reduced, The nozzle body and the peripheral members do not scatter or fly, and safety can be ensured.

[Brief description of the drawings]

FIG. 1 is a partially broken side view of a first embodiment of the present invention.

FIG. 2 is a partially broken side view when the nozzle body falls off.

FIG. 3 is a sectional view of a modification of the first embodiment.

FIG. 4 is a sectional view of another modification.

FIG. 5 is a sectional view of still another modification.

FIG. 6 is a partially broken side view of the second embodiment.

FIG. 7 is a cross-sectional view from the plane of the second embodiment.

FIG. 8 is a perspective view of a conventional device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pile 2 Mounting member 4 Nozzle body 4a Injection port 4b Passage 8 Escape hole 9 Plug 11 Band (mounting member)

Claims (1)

(57) [Claims] 1. A nozzle body having a jet for jetting jet water and a passage communicating with the jet, and the nozzle
It consists of a mounting member that inserts and holds the main body and fixes it to the driving pile.
The nozzle body has a relief hole communicating with the passage, and the relief hole is opened at a portion held by the mounting member.
Or by attaching the mounting member to a plug, or
By holding the plug with the mounting member,
Jet nozzle device with closed holes .