JPH0892955A - Jet nozzle fixing device - Google Patents

Abstract

PURPOSE: To fix and remove a jet nozzle with and from a pile with ease by inserting the jet nozzle into a holding member which is preliminarily mounted to the pile and pressing a shearable locking member from the holding member and engaging the locking member with an engagement groove of the jet nozzle. CONSTITUTION: A holding member whose top and bottom are opened, is mounted to the upper part of a pile by welding or the like. A jet nozzle 3 is inserted into the holding member 2 from the top. An engagement groove 5 in peripheral groove structure is formed on the outside surface of a nozzle head 3a of the jet nozzle 3 where a large-sized flange 6 is mounted to the upper part and placed into contact with the upper end face of the holding member 2, thereby setting an insertion depth of the jet nozzle head 3a. A pin hole is formed on an area equivalent to the engagement groove 5 of the nozzle head 3a where a shear pin 7 is pressed in and the insertion tip is pressed into the engagement groove 5 and engaged with the engagement groove, thereby fixing the jet nozzle 3 with the holding member 2. In addition to that, the shear pin 7 is arranged to break down by its self by the action of a load greater than required, thereby forming a shearable engagement member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for fixing a jet nozzle for jetting jet water to the ground to a pile.

[0002]

2. Description of the Related Art When a pile is driven into hard ground, a jet nozzle is attached to the pile and jet water is jetted from the jet nozzle to the ground. FIG. 9 shows a conventional structure for fixing this jet nozzle to a pile. Sign 1
Is a pile made of steel sheet pile, which is gripped by a chuck (not shown) of a pile press-in / pull-out machine, and is set on the ground by lowering the chuck. The jet nozzle 90 is fixed to the pile 1 so that the ejection 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 that is curved so as to have the same curvature as the circumferential groove, and in a state of being fitted into the circumferential groove of the nozzle socket 91, by welding both end portions 93, 93 to the side surface of the pile 1, The jet nozzle 90 is fixed to the pile 1. The fixed jet nozzle 90 is collected at the time when the driving of the pile is completed, and this collection is performed by cutting the band 90 to separate it from the pile I.

[0004]

In the conventional fixing structure,
Since it was necessary to weld the band 92 to the pile 1, the installation of the jet nozzle 90 was troublesome. Moreover, if this welding is weak, there is a risk that the band 92 will come off and the jet nozzle 90 will fall off during the driving of the pile, while if the welding is too strong, a large edging force will be required during removal. Therefore, there is a problem that the jet nozzle 90 is damaged. Further, when boulders or the like in the ground hit the band 92, the impact causes the band 92 to come off.

The present invention has been made in consideration of the above circumstances and is not only easy to attach to a pile but also easy to remove from the pile, and inadvertently detached from the pile. An object of the present invention is to provide a device for fixing a jet nozzle to a pile, which has a flat structure. In addition to this, an object of the present invention is to provide a fixing device having a structure that does not fall off even when a cobblestone or the like collides.

[0006]

A jet nozzle fixing device according to the present invention includes an engaging groove formed on an outer surface of a jet nozzle and an upper surface of the jet nozzle which is attached to a pile to be driven and which is inserted from the upper surface. A holding member whose lower surface is opened,
A shearing engagement member that engages with the engagement groove of the jet nozzle from the holding member is provided.

Another jet nozzle fixing device according to the present invention is, in addition to the above-mentioned structure, further provided with a cover member having a passage hole for jet water and covering the lower surface of the holding member.

In these fixing devices, a plurality of engaging grooves having different widths can be formed in the jet nozzle, and the engaging members can be engaged with the respective engaging grooves. Further, the engaging member in the present invention may be a shear pin press-fitted into the holding member, or may be a bent piece integrally formed in the holding member so as to be bendable.

[0009]

In the fixing device having the above structure, the jet nozzle can be fixed to the pile by engaging the engaging member from the holding member with the engaging groove of the jet nozzle. Therefore,
Welding becomes unnecessary, and various problems caused by the strength of welding do not occur. This engaging member can be sheared like a shear pin and is broken or deformed by a simple impact or the like. Therefore, the jet nozzle can be easily removed.

In the structure provided with the cover member, the boulders and the like blown up by the jet water are prevented from colliding with the jet nozzle and the engaging member, and the jet nozzle is not damaged and the engaging member is not sheared due to the collision. .

On the other hand, a plurality of engaging grooves having different widths are provided,
With the configuration in which the engagement members are engaged with the respective engagement grooves, even if one engagement member is damaged, the jet nozzle can be held by the other engagement member, and a plurality of engagement members can be provided. It can be sheared individually.

[0012]

FIG. 1 shows a first embodiment of the present invention. Reference numeral 1 is a pile such as a steel sheet pile, which is pressed into the ground by driving a pile press-in / pull-out machine (not shown). A holding member 2 is attached to a portion (upper part) of the pile 1 that is extracted from the ground. The holding member 2 has a tubular shape with upper and lower surfaces opened, and is fixed to the pile 1 by an appropriate means such as welding or bolting. The jet nozzle 3 is inserted into the holding member 2 from above.

The jet nozzle 3 includes a nozzle head 3a,
The nozzle head 3a includes a nozzle pipe 3b connected to the upper end of the nozzle head 3a by a screwing structure. The nozzle head 3a has a jet port at its lower end, and jets high-pressure jet water 4 toward the ground. An engagement groove 5 having a circumferential groove structure is formed on the outer surface of the nozzle head 3a of the jet nozzle 3. In this case, a large-diameter flange portion 6 is formed on the upper portion of the nozzle head 3a, and the flange portion 6 contacts the upper end surface of the holding member 2 to set the insertion depth of the nozzle head 3a. It is like this.

A pin hole is formed in a portion of the holding member 2 corresponding to the engaging groove 5 of the nozzle head 3a, and the shear pin 7 is press-fitted into this pin hole. The shear pin 7 is struck by a hammer or the like and press-fitted into the holding member 2, and by this press-fitting, the insertion tip portion thereof enters the engagement groove 5 and engages with the engagement groove 5. Thus jet nozzle 3
Are fixed to the holding member 2. The shear pin 7 breaks itself when a load more than necessary is applied, and thus constitutes a shearable engagement member.

In this embodiment as described above, the nozzle head 3a is inserted into the holding member 2 previously attached to the pile 1, and the shear pin 7 as the engaging member is press-fitted from the holding member 3 side to engage. By engaging the groove 5, the jet nozzle 3 can be fixed to the pile 1.
For this reason, welding can be performed without fixing, and fixing can be performed easily. On the other hand, the jet nozzle 3 is removed by applying a load in the length direction to the jet nozzle 3 and breaking the shear pin 7. Therefore, the jet nozzle 3 can be easily removed.

In FIG. 1, reference numeral 8 is a cover member attached to the lower end surface of the holding member 2 by welding or the like. This cover member 8 has a passage hole 8a through which the jet water 4 passes, and after being attached to the lower end surface of the holding member 2,
The lower surface of the holding member 2 other than the passage hole 8a is closed. By mounting the cover member 8, stones and soil from the ground are prevented from entering the holding member 2. For this reason, stones and soil do not collide with the nozzle head 3a, and the shear pin 7 can be prevented from breaking due to these collisions.
Therefore, the jet nozzle 3 is prevented from being accidentally dropped.

2 and 3 show a modified example of the shear pin 7 as an engaging member, in which a pair of pin holes 9 are formed in the holding member 2 so as to face each other in a straight line. The shear pin 7 has a length that penetrates the pair of pin holes 9.
Is press-fitted into the holding member 2 so as to pass through. Here, the pin hole 9 is formed in a portion facing the engagement groove 5 of the jet nozzle 3, and the shear pin 7 penetrating the pin hole 9 fits into the engagement groove 5 of the jet nozzle 3 and engages. In this way, the jet nozzle 3 can be fixed to the holding member 2.

FIG. 4 shows a second embodiment of the present invention, in which the engaging groove 10 is formed on the outer surface of the nozzle head 3a of the jet nozzle 3.
11 are formed in upper and lower two stages. On the other hand, when the shear pin 7 is press-fitted from the holding member 2, the shear pin 7 enters and engages with the respective engagement grooves 10 and 11. In this way, a plurality of engagement grooves 10 and 11 are formed in the jet nozzle 3,
By engaging the shear pins 7 with the respective engagement grooves 10 and 11, even if one of the shear pins 7 is cut by some external force, the other shear pin 7 fixes the jet nozzle 3, so that the jet nozzle 3 is not attached. It is possible to prevent easy dropout.

In addition, in the illustrated example, the engagement grooves 10 and 11 are formed.
Are different in width. That is, the lower engaging groove 10 has a width substantially equal to the diameter of the shear pin 7, but the upper engaging groove 11 has the same width.
Is wider than that. Therefore, the shear pin 7 engages with the upper engagement groove 11 in a loosely inserted state. When a tensile force is applied to the jet nozzle 3 with respect to such a structure, the lower shear pin 7 breaks first, and after this break, the upper shear pin 7 breaks and the jet nozzle 3 is removed. Therefore, the load at the time of removing the jet nozzle 3 can be the force of one shear pin, and there is an advantage that a large force is not required.

5 and 6 show a third embodiment of the present invention. In this embodiment, a bending piece 20 extending upward as shown in FIG. 6 is partially formed on the upper end portion of the cylindrical holding member 2. The bent piece 20 constitutes an engaging member that engages with the engaging groove 5, and can be bent inward by hitting with a hammer or the like. As shown in FIG. 5, the jet nozzle 3 is inserted into the holding member 2 from above, and the bending piece 20 is bent in this state. This bending is performed so that the bent piece 20 enters the engaging groove 5 of the jet nozzle 3, and the bent piece 2 is bent.
No. 0 fixes the engagement groove 5 and the engagement 4 (fixes the jet nozzle 3).
As a result, the jet nozzle 3 can be attached without welding. The bent piece 20 is easily broken or bent to its original shape by the action of an excessive pulling force.
That is, the jet nozzle 3 can be easily removed by applying a pulling force that pulls up the jet nozzle 3 to raise or break the bent piece 20.

FIG. 7 shows a modified example of the third embodiment, in which a plurality of cuts 21 are formed in the upper portion of the holding member 2, and the cuts 21 are bendable pieces 20. Therefore, the jet nozzle 3 can be fixed by selecting and bending an appropriate bending piece 20. In this structure, the plurality of bent pieces 20 can be bent to fix the jet nozzle 3, and by using the bent pieces 20 one by one, the jet nozzle 3 can be fixed and removed multiple times. Can be applied.

FIG. 8 shows still another modification, in which the lower portion of the holding member 2 is bent inward by a press or the like to close the lower surface of the holding member 2. This bent portion serves as a cover member 8 that prevents the intrusion of stones and soil, thereby protecting the inside of the holding member 2. Reference numeral 8 a is a jet water passage hole provided in the cover member 8. By integrally forming the cover member 8 on the holding member 2 in this manner, there is an advantage that the cover member 8 does not need to be attached.

[0023]

As described above, according to the present invention, since the engaging member such as the shear pin or the bent piece is engaged with the engaging groove of the jet nozzle from the holding member previously attached to the pile to fix the jet nozzle to the pile, the welding is performed. It becomes unnecessary and can be fixed easily.
Further, since the jet nozzle is removed by breaking the engagement member by applying a shearing force, the removal is also facilitated.

According to the present invention, by providing the cover member, it is possible to prevent stones and soil from entering the holding member, and prevent damage to the jet nozzle and accidental breakage of the engaging member.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view from a plane of a modification of the first embodiment.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view of the second embodiment.

FIG. 5 is a sectional view of the third embodiment.

FIG. 6 is a perspective view of a holding member according to a third embodiment.

FIG. 7 is a perspective view of another example of the holding member.

FIG. 8 is a sectional view of still another example of the holding member.

FIG. 9 is a perspective view of a conventional structure.

[Explanation of symbols]

 1 Pile 2 Holding Member 3 Jet Nozzle 5 Engagement Groove 7 Shear Pin 8 Cover Member

Claims (5)

[Claims] 1. An engagement groove formed on an outer side surface of a jet nozzle, and a holding member attached to a pile to be driven and having the upper and lower surfaces opened with the jet nozzle inserted from the upper surface.
A jet nozzle fixing device comprising a shearable engagement member that engages with the engagement groove of the jet nozzle from the holding member. 2. An engagement groove formed on an outer surface of a jet nozzle, and a holding member which is attached to a pile to be driven and which has the jet nozzle inserted from the upper surface and whose upper and lower surfaces are opened.
A shearable engagement member that engages with the engagement groove of the jet nozzle from the holding member, and a cover member that has a passage hole for jet water jetted from the jet nozzle and covers the lower surface of the holding member are provided. Fixing device for jet nozzle. 3. The jet nozzle fixing device according to claim 1, wherein a plurality of engagement grooves having different widths are formed in the jet nozzle, and the engagement member engages with each engagement groove. . 4. The jet nozzle fixing device according to claim 1, wherein the engagement member is a shear pin pressed by a holding member. 5. The fixing device for a jet nozzle according to claim 1, wherein the engaging member is a bending piece integrally formed with the holding member so as to be bendable.