JP2001303541A - Injection switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely, easily and efficiently change water to a filler or vice versa in a high-pressure ejection agitating method for use in soil improvement. SOLUTION: This injection switching device 1 is inserted in a high-pressure hose 5 forcibly feeding or injecting water or a filler by means of a device comprising a rod 2 connected to the end of the high-pressure hose 5 via a swivel 4, a jet nozzle 30 having a water injection hole and a filler injection hole and connected to the end of the rod 2, and a high-pressure pump 7 connected to the opposite side of the high-pressure hose 5. The injection switching device 1 is located halfway between the swivel 4 and the high-pressure pump 7 and is provided with a pellet hole 14; pellets 20 are put in the pellet hole 14 and passed through the high-pressure hose 5 by force-feeding of the filler so that the pellets reach the pellet-receiving base 35 of the jet nozzle 30 connected to the end of the rod 2, closing the nozzle hole of the jet nozzle 30 provided below the pellet-receiving base 35, and making it possible to change water to the filler or vice versa for injection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection switching device used in a high-pressure injection stirring method or a chemical liquid injection method. Further speaking, a cylindrical hole is drilled in the ground while water is being sprayed, and when this reaches a predetermined depth, the water spray is stopped, and an injectant, which is a hardener slurry, is injected into the drilled columnar hole. The present invention relates to an injection switching device interposed in a high-pressure hose used in a soft ground improvement method or a chemical liquid injection method.

[0002]

2. Description of the Related Art As one type of ground improvement method, water is injected into a sandy or hard ground to form a column-shaped hole, and when the depth reaches a predetermined depth, the water injection is stopped and injected into the hole. A method of injecting an agent is widely used. In this method, a large amount of water is pumped to a predetermined position in the ground improvement area by a high-pressure pump using a high-pressure hose via a mixing device or the like on the way, and supplied to a vertical rod in the ground via a swivel. It is.

An injection nozzle is connected to the tip of the rod,
Since the injection nozzle is provided with an injection hole at the longitudinal end, water pumped at a high pressure is injected from this injection hole to pierce a columnar cavity in the ground, and at the same time, gradually lay the rod underground. It is something to enter. Then, when the rod reaches the predetermined depth, the pumping of the water is stopped, the swivel or the joint of the rod is cut off, a small ball such as a pachinko ball is inserted into the water supply system of the rod with a steel ball, and then injected into the high-pressure hose. After the agent is flown, the small balls are sent to the ball receiving pedestal of the injection nozzle joined to the tip of the rod and set. Thereby, the water injection hole of the injection nozzle joined to the rod end is closed.

In this state, when the injection is further pumped by a high-pressure pump, the injection nozzle at the tip of the rod has the water injection hole closed as described above, so that the injection is not injected from here. Instead, the injection is injected from an injection outlet provided on the side of the injection nozzle. During this time, the rod is rotated about the vertical direction by the machine, so that the injection agent injected from the slurry injection hole is filled into the outer periphery of the rod in a columnar hole in the columnar hole, and is filled here. Columns of the injectant will form in the ground. Thereafter, the rod is withdrawn and the injection material is cured to improve the ground.

[0005] In the high-pressure injection stirring method as described above, it is necessary to switch between water injection and injection injection at the time of construction. The joint of the rod was cut off, a small ball such as a pachinko ball was put into the water supply system, and then the joint was connected again. The same thing has been performed in the chemical liquid injection method.

[0006] However, the conventional water / injection injection switching operation in which such a swivel or rod joint is separated and small balls are put into the water supply system from there is actually a very dangerous operation. In other words, this work has a bad footing due to its nature, and in addition, the worker may be exposed to a large amount of residual water when disconnecting the swivel or rod joint, or an accident may occur due to the swivel or rod joint. . Also, this was very dangerous when working at heights. Furthermore, this was a major problem in terms of work efficiency.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a method for removing a swivel or a rod having a problem in danger or workability when switching from water to an injecting agent in a high-pressure injection stirring method or a chemical liquid injection method used for ground improvement. Without performing the joint disconnection work, the injection switching device is interposed in the high-pressure hose so that the small balls can be fed into the water supply system from here, and the water / injectant switching can be performed safely, easily and efficiently. To make it possible.

[0008]

According to the present invention, a rod is connected to a tip of a high-pressure hose via a swivel, and an injection nozzle having a water injection hole and an injection agent injection hole is connected to the tip of the rod. On the side, a high-pressure pump is connected, and the water or the injection agent is pumped, and is a jet switching device interposed in a high-pressure hose used in a soft ground improvement method or a chemical liquid injection method for jetting, and the jet switching device is The injection switching device is provided between the swivel and the high-pressure pump, and the injection switching device is provided with a small-ball injection hole. To the ball receiving pedestal of the injection nozzle connected to the tip of the rod, thereby closing the injection hole of the injection nozzle provided below the ball receiving pedestal and enabling water / injectant injection switching. That The injection switching device according to claim 1, wherein a bolt for opening and closing an opening thereof is attached to the injection switching device to be characterized (claim 1) and a small ball insertion hole of the injection switching device. (Claim 2).

[0009]

According to the construction of the present invention, an injection switching device is arranged between the swivel of the high pressure hose and the high pressure pump, and a small ball injection hole is provided in the injection switching device to allow the small balls to be inserted into the high pressure hose. It can be sent to The small balls sent into the high-pressure hose are then automatically sent to the swivel by introducing the infusate into the high-pressure hose and pressure-feeding them. , And the water injection hole opened below is closed, thereby switching the injection of water / injectant. Thereafter, when the injectant is continuously fed under pressure, the slurry is discharged from the injectant injection hole of the injection nozzle provided on the side of the rod tip, and the injectate is filled into the ground in a columnar shape. Therefore, the injection switching by the high-pressure injection stirring method is performed safely, easily, and efficiently.

[0010]

Embodiments of the present invention will be described below. FIG.
FIG. 1 is a sectional view showing a partial side surface of an injection switching device according to an embodiment of the present invention. FIG. 2 is an explanatory diagram showing a state of ground improvement work performed by a high-pressure injection stirring method using a high-pressure hose provided with the injection switching device 1 shown in FIG. In FIG. 2, 2 is a rod. The rod 2 is installed vertically on the ground 3 to be improved. FIG. 3 is an enlarged sectional view of the injection nozzle joined to the lower part of the lot 2.

As shown in FIG. 2, the rod 2 is connected at its upper end to a high-pressure hose 5 by a swivel 4.
The high-pressure hose 5 has a required length, and the injection switching device 1, the mixing head 6, and the high-pressure pump 7 of the present invention are connected in the middle as shown in the figure. The high-pressure pump 7 is further connected to an agitator of a hardening agent slurry, which is not shown, by a hose. Also, this high pressure pump 7
Is connected to a water storage tank (not shown) by a hose so that the hardener slurry and water can be selectively pumped at a high pressure as needed. Further, the rod 2 is connected to a construction machine 8 so that the rod can be rotated in a vertical direction at an arbitrary speed as required during construction. Has high-pressure hose joints 10 and 11 on both sides, and a flow path 13 of water or hardener slurry is provided inside. Furthermore, this injection switching device has a central part shown in FIG.
A small ball insertion hole 14 for inserting a small ball indicated by 0 is provided. The small ball insertion hole 14 is usually closed with a bolt 15 with a screw. In order to insert the small ball 20 from this, the bolt 15 is removed, the small ball 20 is inserted through this opening, and this opening is screwed again with the bolt 15 and closed.

FIG. 3 is a plan view of the injection nozzle 30. The injection nozzle 30 is connected to the tip of the rod 2. As shown in FIG. 3, the injection nose 30 has a sub-body 32 screwed to a lower portion of a nozzle body 31 and a metal crown 33 screwed thereunder. Further, a valve 34 is fitted inside the nozzle body 31. At the upper end of the valve 34, a ball receiving pedestal 35 having a shape in which the small ball 20 is fitted is provided. At the lower end of the valve 34, a ball-shaped sealing member 36 is constantly pressed toward the valve 34 by a spring 37, and a check valve is formed here. Nozzle body 31
The injection hole 38 of the hardener slurry which is an injection agent is formed substantially at the center of the nozzle, and the injection hole 38 is connected to the slurry injection port 39.

In the high-pressure injection stirring method or the chemical liquid injection method of ground improvement performed using this apparatus, water is pressure-fed in a direction indicated by an arrow from a water tank (not shown) using a high-pressure pump 7 in FIG. The liquid is supplied to the injection nozzle 30 at the tip of the rod 2 through the rod 2. The injection nozzle 30 presses the seal member 36 with the pressure of the water being pumped, and the valve 34
The lower end of the metal crown 33 is opened, and water is injected at a high pressure from a water injection hole 33A below the metal crown 33. A columnar hole is formed in the ground 3 around the rod 2 by the water injection pressure by this, and the rod 2 is made to enter the ground 3 while maintaining this state. During this time, when the length of the rod 2 is insufficient, several rods are connected to perform drilling. When the perforation reaches a predetermined depth, for example, 20 meters, the operation of the high-pressure pump is stopped and the perforation is stopped. In this state, the seal member 36 at the lower end of the valve 34 is pressed upward by the spring 37 to prevent the water in the perforated portion from flowing backward from the water injection hole 33A of the injection nozzle 30 to the high-pressure hose 5.

Next, the bolt 15 of the injection switching device 1 is removed, small balls are thrown into the small ball insertion hole 14, which is the opening, and the bolt 15 is attached again to close the small ball insertion hole. In this state, the hardener slurry (not shown) is pumped by the high-pressure pump 7 in the same manner as the water pumping described above. Then, the above-mentioned small balls put into the injection switching device 1 pass through the high-pressure hose 5, the swivel 4, and the rod 2 by the pressure feed of the hardened slurry, reach the injection nozzle 30 at the tip of the rod 2, and further receive the ball receiver therein. It is positioned on the pedestal 35 almost instantaneously. In this state, the hardened slurry fed thereafter does not jet from the water injection hole 33A of the metal crown 33 at the tip of the injection nozzle, but passes through the slurry injection hole 38 provided at the center of the injection nozzle 30 to supply slurry. It is injected from the inlet 39 in the lateral direction. During this time, since the rod 2 is being rotated by the machine 8, the injected hardener slurry is filled in the column-shaped perforations formed by water injection. When the hardening agent slurry is sufficiently filled in the perforations and formed into a columnar shape, the rod is removed, and the hardening agent slurry is hardened to improve the ground.

[0015]

As described above, by using the injection switching device of the present invention, the injection switching of water / injectant can be performed very safely and easily. Conventionally, switching of water / injectant has been difficult because scaffolding is poor because the swivel or rod joints are cut off and small balls are inserted, which may cause residual water and may pose a danger in working at heights. However, according to the present invention, workability is greatly improved and danger is eliminated, and work efficiency is also greatly improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a partial cross section of an injection switching device of the present invention.

FIG. 2 is an explanatory view showing a state in which the ground is being improved by a high-pressure injection stirring method using the injection switching device of the present invention.

FIG. 3 is a cross-sectional view of an injection nozzle at the tip of a rod.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Injection switching device, 2 ... Rod, 3 ... Ground, 4 ... Swivel, 5 ... High pressure hose, 6 ... Mixing head, 7 ... High pressure pump, 8 ... Machine, 10, 11 ... High pressure hose joint, 13 ... Water or Slurry channel, 14 ... Small ball input hole,
15 ... bolt, 20 ... small ball, 30 ... injection nozzle, 31 ...
Nozzle body, 32 sub-body, 33 metal crown, 33A water injection hole, 34 valve, 35 ball receiving pedestal, 36 seal member, 37 spring, 38 slurry injection hole, 39 slurry injection port.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiki Ishii 2-17-4 Yanagibashi, Taito-ku, Tokyo Onoda Chemiko Co., Ltd. (72) Asahi Matsuda 2-17-4 Yanagibashi, Taito-ku, Tokyo Onoda Chemiko Co., Ltd. F-term (reference) 2D040 AB01 AB03 BA01 CB03 DA09

Claims (2)

[Claims] 1. A rod is connected to a tip of a high-pressure hose via a swivel, and an injection nozzle having a water injection hole and an injecting agent injection hole is connected to the tip of the rod. A high-pressure pump is connected to the opposite side of the high-pressure hose. Pumping water or infusate with
An injection switching device interposed in a high-pressure hose used in a soft ground improvement method for injecting or a chemical liquid injection method, wherein the injection switching device is located between a swivel and a high-pressure pump,
In addition, the injection switching device is provided with a small ball insertion hole, and by inserting the small ball into the small ball insertion hole, the small ball is passed through the high pressure hose by the injection of the injectant and connected to the rod tip. An injection switching device, which reaches a ball receiving pedestal of a nozzle, thereby closing a water injection hole of the injection nozzle provided below the ball receiving pedestal to enable water / injectant injection switching. 2. The injection switching device according to claim 1, wherein a bolt for opening and closing the opening is attached to the small ball insertion hole of the injection switching device.