JP2003336251A - High pressure injection nozzle tube and solidification piling device provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high pressure injection nozzle tube capable of increasing the piling speed of especially small diametral solidification piles and a solidification piling device provided with the tube. <P>SOLUTION: The high pressure injection nozzle has at least the inner diametral face 11 tapered off to the front end on the inner peripheral face and has a nozzle part 1 having a male screw section 14 at the outer peripheral face and a female screw part 31 screwing with the male screw section 14 of the nozzle part 1 at the inner peripheral face of the one side. The high pressure injection nozzle tube is provided with a tubular base part 3 connected to a high pressure liquid feeding means at the other end side, a tapered off needle part 21 located in the neighborhood of the front end of the nozzle 1 at the front end side, and a nozzle aperture adjustable member 2 fixed to the tubular base part 3 so that the axial center coincides with the axial center of the tubular base center 3. The solidification piling device using the same is provided. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure injection nozzle pipe for injecting high-pressure water or cement milk onto the ground to form a solidification-treated pile, and a solidification-treated pile forming apparatus additionally provided with the nozzle pipe.

[0002]

2. Description of the Related Art One of the ground improvement methods is a solidification pile construction method using a high-pressure jet jet. Further, this solidification treatment pile construction method includes a horizontal jet type solidification treatment pile construction method and a cross jet type solidification treatment pile construction method. Horizontal jet solidification pile construction method, for example, the tip of the mechanical stirring device,
The rotating shaft is rotated in accordance with the core of the pillar to be constructed, and one or more stirring blades radially provided on the lower part of the rotating shaft are placed in the ground inside or outside the rotation range of the stirring blade, and the predetermined position attached to the predetermined position of the rotating shaft is set. High-pressure jet nozzle with long length, high-pressure jet of water, high-pressure jet by injecting water while cutting in-situ soil, stopping discharge when design depth is reached, and rotating or reversing rotation axis as it is. It is a construction method in which a solidifying material such as cement milk is discharged from a nozzle pipe opening by high-pressure jetting, and is pulled up into the ground while stirring and mixing with cutting soil to form a columnar body. In this case, a rotary shaft without a stirring blade may be used.

The cross-jet type solidification pile construction method is a method of injecting a high-pressure cross-jet jet into the ground to form solidification piles to improve the ground. Since the cutting ability sharply decreases at the intersection, the cutting effect is absorbed at the intersection, a kind of form effect occurs, and a solidified pile with high dimensional accuracy can be created.

According to the solidification pile construction method utilizing such a high-pressure jet jet, it is possible to construct a large-diameter columnar solidification pile in which the treatment cost per unit volume is reduced.
Therefore, the conventional high-pressure jet nozzle tube has a structure capable of jetting a jet jet as far as possible.
FIG. 5 shows an example of a conventional high pressure injection nozzle tube. The high-pressure injection nozzle pipe 50 includes a nozzle portion 51 and a base pipe portion 53 that fixes the nozzle portion 51. The inner peripheral surface of the nozzle portion 51 is reduced in diameter from the tip toward the nozzle bore portion 511 and toward the tip. The inner diameter part 512 has a tapered surface shape, and the outer peripheral surface has a male screw part 513. The base pipe part 53 is a female screw part which is screwed to the male screw part 513 of the nozzle part 51 on the inner peripheral surface on one end side. It has a screw part 521 and the other end side is not shown and is 20 to 40 MPa.
Is connected to a high-pressure liquid material supply means including a high-pressure pump. Reference numeral 52 is an O-ring that prevents liquid leakage. According to the high-pressure injection nozzle pipe 50 having such a structure, the nozzle diameter is formed in a tapered surface shape that gradually decreases toward the tip, and since the high-pressure pump is used, the jet jet 54 can be converged and can be far away. Can be jetted up to.

[0005]

In recent years, the demand for ground improvement has been diversified, so that the construction site cannot be widely adopted, or it is desired to construct a large number of small diameter solidified piles, or to increase the speed of solidified pile construction. There is a request. Especially if you want to create a small diameter solidification pile, even if you use the conventional solidification pile construction device, you need to change the nozzle angle in the cross jet type, and in the horizontal jet type a high pressure and large horsepower pump can be used. I had to change to a smaller horsepower pump. The change of the nozzle angle has a problem that the cost is increased due to the new production of the member constituting the nozzle, and the angle adjustment also involves a complicated process. Furthermore, changing the high-pressure pump requires changing large equipment, which is not an easy task.

Therefore, an object of the present invention is to provide a high-pressure injection nozzle which does not require a complicated angle adjustment of the nozzle, allows the high-pressure pump to be used as it is, and can easily meet the demand for changing the finished diameter of the solidified pile. (EN) A pipe and a solidification treatment pile forming device attached with the pipe. Another object of the present invention is to provide a high-pressure injection nozzle pipe capable of increasing the speed of forming a solidified pile having a small diameter, and a solidified pile forming apparatus additionally provided with the high-pressure jet nozzle pipe.

[0007]

Under the circumstances, the present inventors have conducted intensive studies to solve the above problems, and as a result, completed the present invention. That is, according to the present invention (1), the inner peripheral surface has at least a tapered inner diameter portion that reduces in diameter in the distal direction, and the outer peripheral surface has a nozzle portion having a male screw portion, and the inner peripheral surface on one end side. Has a female screw portion that is screwed into the male screw portion of the nozzle portion, the other end side is a tubular base tube portion connected to the high-pressure liquid material supply means, and the tapered end portion is located near the distal end of the nozzle portion. Nozzle diameter adjusting member fixed to the base pipe part so that the shaft center of the base pipe part matches the shaft center of the base pipe part, and is used for construction of a solidification treatment pile. The high-pressure injection nozzle according to the present invention (2), further comprising a lock nut that is screwed onto a male screw part of the nozzle part and locks the nozzle part to the base pipe part. In the present invention (3), the high-pressure liquid material is high-pressure cement milk or high-pressure water. ) Or (2) high-pressure injection nozzle pipe according the present invention (4) is (1) to (3) of the high-pressure injection nozzle tube formed by attached solidification pile reclamation device intended to provide respectively.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a high pressure injection nozzle tube according to an embodiment of the present invention will be described with reference to FIGS.
1 is a schematic cross-sectional view (when the cutting length is short) of a part of the high-pressure injection nozzle pipe of this example, FIG. 2 is a view taken along the line AA of FIG. 1, and FIG. 3 is a high-pressure injection nozzle of this example. FIG. 4 is a schematic cross-sectional view of a part of the pipe (when the cutting length is long), and FIG. 4 is a schematic view of the solidification treatment pile forming apparatus provided with the high-pressure injection nozzle pipe of this example. The high-pressure injection nozzle pipe 10 of this example is attached to the hollow rotating shaft 41 of the solidification treatment pile forming device 40, and includes the nozzle portion 1, the base pipe portion 3, and the nozzle aperture adjusting member 2.
And a lock nut 4.

The nozzle portion 1 has a taper-shaped inner diameter portion 11 whose diameter decreases at least toward the tip end on the inner peripheral surface, and a male screw portion 14 on the outer peripheral surface. In this example, the nozzle portion 1 has a nozzle bore portion 12 having a predetermined opening on the inner peripheral surface, an inner diameter portion 11, and a taper-shaped rear inner diameter that gradually expands in a direction opposite to the tip direction. A nut portion 15 having a hexagonal cross section, which has a portion 13 and is sandwiched by a spanner or the like from the tip end, a male screw portion 14 of a predetermined length, and an outer diameter slightly smaller than the outer diameter of the male screw portion 14 and smooth. It is composed of a seal portion 16 on the outer peripheral surface. Nozzle aperture portion 12 having a predetermined opening at the tip of nozzle portion 1
By providing, it is possible to obtain a converged jet flow when the cutting length of the ground is maximized. Also, the nut portion 15
In addition to the above-mentioned hexagonal cross section, an appropriate outer shape can be selected for the rotating tool.

The base pipe portion 3 is tubular and has one end side (tip side).
Accordingly, the inner peripheral surface has a female screw portion 31 that is screwed into the male screw portion 14 of the nozzle portion 1, and has an inner diameter that is continuous with the female screw portion 31 and that is slightly smaller than the female screw portion 31 on the back side. Nozzle part 1
It has an inner peripheral surface portion 32 that fits tightly with the seal portion 16. An O-ring 5 that fits into an O-ring groove is provided at a portion of the inner peripheral surface portion 32 that fits into the seal portion 16 of the nozzle portion 1, and a slightly behind the O-ring 5 supports a nozzle aperture adjusting member 2 to be described later. The radial ribs 6 are connected. The other end of the base pipe portion 3 is connected to a high-pressure liquid material supply means (not shown) through a pipe arranged in the hollow portion inside the rotary shaft of the solidification treatment pile forming device 40.

The nozzle diameter adjusting member 2 has a tapered needle-like portion 21 whose tip 23 is located in the vicinity of the tip of the nozzle portion 1, and a rod-shaped main body portion 22 having a circular cross section which is continuous with the needle-like portion 21 and whose axial center is the base tube portion. The base pipe portion 3 is fixed in a suspended state so as to match the axis of the base pipe 3. The method of fixing the nozzle diameter adjusting member 2 and the base pipe portion 3 is as follows.
2 is a method of joining the other ends of four radially extending radial ribs 6 joined to the inner peripheral surface portion 32 of the base pipe portion 3 to the four gaps 7 formed by the four radial ribs 6 at high pressure. The liquid substance of the above will pass (Fig. 2). In this way, by fixing the nozzle diameter adjusting member 2 to the base pipe portion 3 and adjusting the screwing degree of the nozzle portion 1 to the base pipe portion 3, the positional relationship between the nozzle portion 1 and the nozzle diameter adjusting member 2 is obtained. Is adjusted to freely set the opening degree of the nozzle.

The lock nut 4 is for locking the nozzle portion 1 to the base pipe portion 3, is screwed into the male screw portion 14 of the nozzle portion 1, and the outer peripheral shape is easily clamped and rotated by a tool such as a spanner. It has a hexagonal shape. In addition, the outer peripheral shape of the lock nut 4 can be selected in addition to the above-mentioned hexagonal section, and an appropriate shape according to the tool used. The method of locking the nozzle portion 1 to the base pipe portion 3 is not limited to the method of using the lock nut 4 as described above, and for example, the nozzle portion 1
A method of using a lock pin for locking the base tube portion 3 can also be used. In this case, one screw hole into which the lock pin is screwed is provided on the side of the base tube portion 3 that is screwed with the nozzle portion 1, and the tip of the lock pin is pushed into the surface of the male screw portion 14 of the nozzle portion 1 so that the nozzle The part 1 and the base pipe part 3 are locked.

The high-pressure jet nozzle tube 10 of this embodiment can change the ground cutting length of the high-pressure liquid material jetted from the tip of the nozzle portion 1 depending on the degree of screwing of the nozzle portion 1 into the base pipe portion 3. That is, in the high-pressure injection nozzle pipe 10 shown in FIG. 1, the nozzle portion 1 is rotated in the direction of the arrow X to maximize the degree of screwing into the base pipe portion 3.
The step 17 extending from the male screw portion 14 to the seal portion 16 abuts on the step 34 on the inner peripheral surface of the base tube portion 3 so that further screwing is impossible. In this state, the tip 23 of the nozzle diameter adjusting member 2 is aligned with the tip surface 18 of the nozzle portion 1, so the nozzle diameter adjusting member 2 acts to reduce the diameter of the nozzle diameter portion 12. When a high-pressure liquid material is supplied to such a nozzle bore from a high-pressure liquid material injection means (not shown), the jet flow from the nozzle portion 1 is diffused, so that the cutting ability for cutting the ground is reduced and the cutting length is shortened to L1. .
Since this diffused jet spreads in a conical shape, it has a circular cross section with a diameter W1 at the cutting length L1. The nozzle portion 1 may be further screwed into the base tube portion 3. In this case, the diameter of the nozzle is narrowed to the extent that it is almost closed, and the cutting length L1 can be made as close as possible to zero.
The cutting width W1 can be made larger. By increasing the diffusion state of the jet flow, the cutting ability to cut the ground is reduced, but the cutting width is increased, the rotation speed of the rotary shaft can be increased, and the pulling speed is also increased. The construction efficiency is improved. Therefore, it is particularly suitable for applications such as forming a large number of small-diameter solidification-treated piles and increasing the formation speed of the solidification-treated piles.

The high-pressure injection nozzle pipe 10 shown in FIG. 3 is one in which the degree of screwing the nozzle portion 1 into the base pipe portion 3 is reduced. That is, in the high-pressure injection nozzle pipe 10 in the state of FIG. 1, the lock nut 4 is loosened, and then the nozzle portion 1 is turned in the arrow Y direction so that the tip position of the nozzle portion 1 is from the tip of the base pipe portion 3 (L4-L2). ) Project by a minute. In this state, since the tip 23 of the nozzle aperture adjusting member 2 is located in front of the nozzle aperture 12 of the nozzle portion 1, the nozzle aperture adjusting member 2 has almost no influence on the aperture of the nozzle aperture 12. When a high-pressure liquid material is supplied from a high-pressure liquid material ejecting means (not shown) to such a nozzle bore, the jet flow from the nozzle portion 1 converges and the ground cutting ability is enhanced,
The cutting length is L3, which is longer than L1 in FIG. The converged jet has a circular cross section with a diameter W2 at the cutting length L3. By making the jet flow convergent, the cutting ability of the ground is enhanced and the cutting width is reduced. In this case, it is possible to construct a large diameter solidified pile having a reduced construction cost per unit, although the pulling speed of the rotary shaft cannot be increased.

The solidification treatment pile forming apparatus of the present invention is a known solidification treatment pile forming apparatus used in a conventional horizontal jet type or cross jet type solidification treatment pile forming method, in which a high pressure injection nozzle tube is used for the high pressure injection nozzle pipe of the present invention. It is replaced with an injection nozzle tube. If an example of the solidification treatment pile building device of the present invention is shown, a crawler crane, a leader that supports or guides the forced lifting device having one end fixed to the crawler crane,
It is composed of a hollow rotary shaft connected to the forced lifting device and a high pressure liquid supply means installed on the ground which is connected through a pipe and a high pressure injection nozzle pipe attached to the tip of the rotary shaft.
FIG. 4 is a diagram showing an outline of the tip portion of the rotary shaft. In the solidification treatment pile forming apparatus 40, one or more stirring blades 42, 43 having a length L on one side, and a high-pressure injection nozzle tube attached to the rotating shaft portion on the back side of the stirring blades 42, 43 are provided below the rotating shaft 41. The solidified material supply pipe 9 is provided below the rotary shaft 41. Reference numeral 45 is an excavation bit.

A method of forming a solidification-treated pile by using the solidification-treated pile forming apparatus 40 provided with the high-pressure injection nozzle pipe 10 of FIG. 1 of this embodiment will be described below. In the high-pressure injection nozzle pipe 10, the screwing degree of the nozzle portion 1 with respect to the base pipe portion 3 is adjusted on the ground. That is, if the degree of screwing is as shown in FIG. 3, as described above, the lock nut 4 is loosened, and the nozzle portion 1 is turned in the direction of the arrow X to rotate the base tube portion 3
Screw into the nozzle part 1 and the nozzle aperture adjusting member 2
Adjust the positional relationship of. Next, a publicly known horizontal jet type solidification treatment pile construction method is applied.

In the horizontal jet type solidification pile construction method, for example, the agitating blades 42, 4 are provided by rotating the tip of the rotary shaft 41 in accordance with the core of the column to be installed and radially provided below the rotary shaft 41.
Water is jetted at high pressure from the high-pressure jet nozzle pipes 10 and 10 attached to the rotary shaft 41 into the ground inside and outside the rotation range of No. 3, and in-situ cutting is performed while penetrating, and water is discharged when the design depth is reached. And rotating or reversing the rotary shaft as it is, the solidified material such as cement milk is discharged from the high-pressure injection nozzle tubes 10 and 10 by high-pressure injection, and is pulled up into the ground while stirring and mixing with cutting soil to form a columnar body. Create. This method is a method to loosen the improved ground while cutting the ground with water at the time of penetration, and to supply the solidified material at the time of extraction, but it is not limited to this, there is no injection of water etc. at the time of penetration, and high-pressure injection at the time of extraction Water may be jetted from the nozzle pipes 10 and 10 and the solidified material may be discharged from the solidified material supply pipe 9 attached to the lowermost portion.

The high-pressure jet nozzle tube 10 of the present invention can be applied to a cross jet type solidification pile construction method. In this case, on the ground, in addition to adjusting the degree of screwing of the nozzle portion 1 into the base pipe portion 3, the injection angle is also adjusted in advance so that the cutting length intersects well. The high-pressure injection nozzle pipe 10 of the present invention may inject a solidifying material such as cement milk or water in the solidifying pile forming step, and in this case, the solidifying material supplying means and the water supplying means on the ground. A switching valve or the like may be provided in the middle of the branch pipe connected to, and control such as switching may be performed by an appropriate control means. In the solidification pile forming apparatus of the present invention, the one having the stirring blade can make the length of the high-pressure injection nozzle tube the same as the length on one side of the stirring blade, so that the total length of the stirring blade length and the cutting length, for example, a diameter of 1, A solidified pile of 400 to 3,000 mm can be constructed, and one without a stirring blade has a diameter of 6 mm.
It is possible to create solidified piles with a thickness of 00 to 1,400 mm. The one without a stirring blade is suitable for a narrow place where it is difficult to carry in a large machine.

[0019]

By using the high pressure jet nozzle tube of the present invention,
Since the existing high-pressure pump can be used as it is without the need for complicated angle adjustment of the nozzle, it is possible to easily meet the demand for changing the finished diameter of the solidified pile. Also,
It is possible to easily meet the demand for the creation of a finished diameter that is optimal for the construction conditions, making the construction economical. Particularly, in the horizontal jet type solidification pile construction method, it is preferable because it can be performed only by simple screwing adjustment of the nozzle. Further, when the high-pressure injection nozzle pipe of the present invention is adjusted to be a diffusion jet and a solidified pile having a small diameter is formed, the cutting width can be increased and the formation speed can be increased, which is economical. .

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a part of a high pressure injection nozzle tube according to an embodiment of the present invention.

FIG. 2 is a view taken along line AA of FIG.

FIG. 3 is a schematic cross-sectional view of a part of the high pressure injection nozzle tube according to the embodiment of the present invention.

FIG. 4 is a schematic diagram of a part of the solidified pile forming device according to the embodiment of the present invention.

FIG. 5 is a schematic view of a part of a conventional high pressure injection nozzle tube.

[Explanation of symbols]

1,51 nozzle part 2 Nozzle diameter adjustment member 3,53 Base pipe part 4 lock nuts 6 radial ribs 7 gap 9 Solidifying material supply pipe 10,50 High pressure injection nozzle tube 11 Tapered inner diameter 12 Nozzle bore 13 Rear inner diameter 14 Male thread 15 Nut part 16 Outer peripheral seal 21 needles 22 Bar body 23 Tip of nozzle diameter adjustment member 31 Male Thread Part 32 Inner surface 40 Solidification pile forming equipment 41 rotation axis L1, L3 cutting length W1, W2 cutting width

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2D040 AB05 BA01 BA08 BC01 BD05                       CA01 CB03 DA11 DA12 DA16                       DA17 DB07 EA21                 2D041 AA01 BA33 DA12 EA04 EB05                 2D050 CA04 CB08 CB42

Claims (4)

[Claims] 1. A nozzle portion having at least an inner diameter portion of a tapered surface on the inner peripheral surface of which a diameter is reduced toward the tip end, and a male screw portion on the outer peripheral surface, and the nozzle portion on the inner peripheral surface on one end side. A tubular base tube part having a female screw part to be screwed with the male screw part, the other end side of which is connected to the high-pressure liquid material supply means, and the tapered needle-like part whose tip is located near the tip of the nozzle part. And a nozzle aperture adjusting member that is fixed to the base pipe so that the shaft coincides with the shaft of the base pipe, and is used for forming a solidified pile. Characteristic high-pressure injection nozzle tube. 2. The high-pressure injection nozzle tube according to claim 1, further comprising a lock nut that is screwed into a male screw section of the nozzle section and locks the nozzle section with the base tube section. 3. The high-pressure liquid material is high-pressure cement milk or high-pressure water.
The high-pressure injection nozzle tube described. 4. A solidified pile forming device, characterized by being provided with the high-pressure injection nozzle pipe according to any one of claims 1 to 3.