JPS5843961Y2 - injection nozzle - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an injection nozzle that can switch between high and low pressures.

Conventionally, it has been used in conjunction with ready-made piles such as concrete piles to penetrate the pile while excavating the ground with a high-pressure injection nozzle, and after penetration, the nozzle pulls it out along with the water pipe connected to it, and then injects mortar or other materials into the excavated pile hole. The excavation and post-treatment method of washing in chemical solutions is widely known.

In this case, excavating the ground and injecting the chemical liquid are separate operations, so the injection nozzle or cylinder with the nozzle that was used for excavation is not used as is, but mortar and other materials are used under low pressure using another nozzle or cylinder. Injecting medicine.

Therefore, even excluding the pile penetration work, the work requires two stages, and two types of equipment must be prepared: one for excavation and one for pouring.

The present invention enables these operations to be carried out with a single device.The key point is that a wide-mouthed low-pressure nozzle piece is attached to one end, and a pressure cylinder to which pressurized liquid is supplied from the other end is attached to the low-pressure nozzle piece. a high-pressure nozzle piece having an axially narrow through hole that fits tightly into the opening of the nozzle piece and is movable within the cylinder substantially coaxially with the axis of the low-pressure nozzle piece; The high-pressure nozzle piece is moved toward and away from the opening of the nozzle piece, and the pressure can be switched between high and low levels by selectively fitting or disengaging the high-pressure nozzle piece into the opening of the low-pressure nozzle piece. It is a cylinder nozzle.

The means for moving the high-pressure nozzle piece is carried out by actuation of the piston, which is connected to a holder of the high-pressure nozzle piece and slides within another pressure cylinder provided in the cylinder above the high-pressure nozzle piece. ing.

Also, in order to prevent low pressure liquid from flowing into the high pressure nozzle piece during low pressure operation, a stopper is fixed within the cylinder which fits into the through hole entrance of the nozzle piece when the high pressure nozzle piece moves to the low pressure side.

Since the present invention is constructed in this way, the injection nozzle is used in parallel with the ready-made pile, and the pile is driven while excavating the ground with high-pressure water, and after the pile has been pushed in, the injection nozzle is switched to the low-pressure side.
The mortar can be poured around the pile by feeding the chemical liquid such as mortar at low pressure and lifting the injection nozzle and the hose that supplies the liquid to the nozzle.

Therefore, the entire operation is extremely efficient.

Examples will be described in detail below with reference to the drawings. In FIG. 1, a pressure cylinder 1 has a low-pressure nozzle piece 2 with a wide opening 4 attached to one end of a cylindrical body with a screw, and a high-pressure cylinder piece 3 facing a mortar-shaped part 5 at the entrance of the opening 4.

The high-pressure cylinder piece has, for example, a shaved pencil-shaped outer surface provided with a frusto-conical shape 6 with an inclined surface that fits into the mortar-shaped part 5 at the tip, and the inner surface 7 has a funnel-shaped slope in the axial direction. The surface is formed so as to converge toward the sliding truncated conical portion, and the tip thereof forms a narrow through hole 8 .

The high-pressure nozzle piece 3 is screwed into a holder 9 for the high-pressure nozzle piece by means of a screw provided along its end opposite to the truncated cone.

The holder is a cylindrical box, and a screw for receiving a nozzle piece 3 is screwed into the inner edge of the box, and a bottom 10 extends to the opposite side to form a piston 11, which will be described later.

Reference numeral 12 denotes a through hole bored in the side surface of the holder box, which communicates with the inside 13 of the holder box.

Said piston is fixed within the cylinder 1 aligned with the central axis of the cylinder 1 by means of a support piece 13'.
The cylinder 14 is connected to the inside 16 by a pipe 15 from the outside of the outer cylinder 1.
is supplied with pressure oil.

Reference numeral 17 denotes a needle stopper of a conical high-pressure nozzle piece with an outer surface that fits the funnel-shaped inner surface 7, which passes through the through hole 12 and is fixed to a support 18 fixed to the outer cylinder 1 with a pin 19 provided at the conical bottom. has been done.

20 is a tension coil stretched between the inside of the low pressure nozzle piece 2 and the holder 9, and serves to constantly separate the high pressure cylinder piece from the low pressure cylinder piece.

21 is a normal piston ring provided on the piston.

The side of the inner cylinder 14 opposite to the piston is preferably conical to reduce resistance to the pressurized liquid.

The use of the injection nozzle of the present invention will be described.

First, when pressure oil is supplied from the pipe 15, the piston 11 moves to the left in the drawing, and along with this, the high pressure nozzle piece 3
The truncated conical part 5 is also moved to the left against the spring 20 pressure and fits into the bowl-shaped part 5 of the low-pressure nozzle piece 2, and at the same time, the funnel-shaped inner surface 7 of the high-pressure nozzle piece 3 and the cone of the needle stopper 17 are fitted. The space between the surfaces opens (Figure 2).

In this state, when pressurized water is applied inside the outer cylinder 1 as shown by the arrow P, the pressure water enters the holder box interior 13 through the through hole 12 in the direction of the arrow, and the conical surface of the stopper 17 and the funnel-shaped inner surface 7
A high-pressure jet flow flows in the Q direction through a narrow through hole 8 that flows between the two and forms a high-pressure nozzle.

Next, when the pressure oil in the pipe 15 is released, the holder 9 and the piston 11 move to the right due to the return action of the spring 20, and the funnel-shaped inner surface 7 fits into the conical surface of the needle stopper 17, stopping the rightward movement (first figure).

In this state, if a chemical liquid or the like is applied at low pressure to the cylinder 1 in the p direction, the chemical liquid will be blocked by the stopper 17 and will not flow toward the high pressure nozzle piece, but will flow in the direction of the arrow and will flow into the wide opening 4 of the low pressure nozzle piece 2.
The water is jetted out at low pressure.

FIGS. 3 and 4 are alternative embodiments corresponding to FIGS. 2 and 1, respectively, and the same or similar parts are numbered 30 in the previous example.
In addition, it is shown.

This embodiment differs from the previous embodiment in that the coil spring is removed from the low-pressure flow path and is provided within the inner cylinder 44 at a position 52.

Therefore, by pushing the piston 41 to the left in the drawing, the holder 39 is also constantly pushed to the left by an extension rod 40a extending from its bottom 40, which corresponds to a connecting rod, and the high pressure nozzle piece 33 is moved to the low pressure. It fits into the nozzle piece 32.

Note that 53 is a cylinder cap, which is screwed onto the mouth of the cylinder 44.

54 is an O-ring that comes into sliding contact with the connecting rod.

Reference numeral 55 is a plug with a hole that communicates with one of the chambers 46a in which the spring 52 is disposed inside the cylinder, is screwed into the outer cylinder 31, and receives pressurized oil through the filter 56 when pressurized.

The operation of the second embodiment is almost the same as the previous example, but
If high pressure water is allowed to flow in the P direction in the state shown in FIG. 3, the liquid will flow in the direction of the arrow and a high pressure flow will flow from the opening 38 of the high pressure nozzle piece 33 in the Q direction.

Next, pressurized oil is supplied from the pipe 45 to the other chamber 4 of the cylinder 44.
In addition to step 6, move the piston 41 to the right against the pressure of the spring 52, align the funnel-shaped inner surface 37 of the high-pressure nozzle piece with the slope of the stopper 47, and flow the low-pressure chemical into the cylinder 31 in the p direction to open it. A low pressure chemical solution is ejected from 34 in the p direction.

As described above, the present invention allows the nozzle to be switched between high and low pressures as required.

Since the switching can be done simply by operating the piston by remote control, it can be easily realized in a deep location where a pile or the like is excavated and cannot be seen.

Therefore, there is a practical effect suitable for injecting a chemical solution such as mortar at low pressure into the excavated position immediately after excavation.

[Brief explanation of the drawing]

The drawings are longitudinal sectional views of the injection nozzle of the present invention, and the first and second
The drawings show a first embodiment, and FIG. 1 shows use under low pressure, FIG. 2 shows use under high pressure, and FIGS. 3 and 4 show the second embodiment under high pressure and low pressure, respectively. 1.31: Pressure cylinder, 11.41: Piston, 2
．． 32: Low pressure nozzle piece, 14.44: Other cylinder, 3.33: High pressure nozzle piece, 17.47: Stopper,
4.34: Opening, 20.52: Spring, 8, 38: Through hole, 9.39: Holder.

Claims (5)

[Scope of utility model registration request] (1) Attach the low-pressure nozzle pieces 2, 32 with wide openings 4, 34 to one end so that the pressure cylinders 1, 31, to which pressure liquid is supplied from the other end, fit tightly into the openings of the low-pressure nozzle pieces. The high pressure nozzle pieces 3 and 33 are movable in the cylinder substantially coaxially with the axis of the low pressure nozzle piece and have axially narrow through holes 8 and 38; An injection nozzle comprising means for moving the high-pressure nozzle piece toward and away from the opening of the low-pressure nozzle, and selectively fitting or disengaging the high-pressure nozzle piece to an opening of a low-pressure nozzle to switch between high and low pressures. (2) The means for moving the high-pressure nozzle piece is interlocking with a piston 11.41 that is higher than the nozzle and slides inside another pressure cylinder 14.44 provided in the cylinder, and the high-pressure nozzle a holder 9 that supports the nozzle piece;
The injection nozzle according to claim 1, characterized in that the injection nozzle is interlocked with the piston by means 39. (3) A utility model in which a stopper 17.47 is fixed to one of the cylinders 1, 31, which fits into the inlet of the high-pressure nozzle piece when switching to low pressure, in order to prevent low-pressure fluid from flowing into the high-pressure nozzle piece. Registered Claims Paragraph 1 or 2
The injection nozzle described in section. (4) A tension spring 20 is tensioned between the low pressure nozzle piece and the holder 9. Claim 2 of the registered utility model
The injection nozzle according to item 1 or 3. (5) The other pressure cylinder 44 is provided with a tension spring 52 that constantly presses the piston 41 on the side opposite to the side where pressure is applied to the piston.
The injection nozzle according to item 1 or 3.