JPS6346543Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a high-pressure injection nozzle, and in particular to a high-pressure injection nozzle used in a pile press-in device using a pressurized water circulation injection pump that excavates the ground and drives piles in civil engineering work. Regarding.

[Conventional technology]

BACKGROUND ART A pile press-in device using a pressurized water circulation type injection pump has been known as a device for excavating the ground and driving piles in civil engineering work.

Therefore, the third high-pressure injection nozzle used in the pile press-in device using this pressure water circulation type injection pump is
The one shown in the figure is known. That is, an inner hole B through which pressurized water is injected as shown by the arrow is bored in the nozzle body A, an inclined hole C is formed so as to be tapered, an inner hole D is formed at the tip, and the diameter is smaller than that of the inner hole B, and an opening E is formed. It has a structure in which pressurized water is injected from it.

Then, the pressure and flow rate of high-pressure water mixed with sand and clay particles are adjusted by the nozzle diameter using a pressure water circulation injection pump, and the area directly below where the pile is driven is excavated. Here, since the high-pressure water is muddy water mixed with sand particles, etc., the sand particles collide with the inner surface of the nozzle and severely erode the inner surface of the nozzle. Therefore, since the pressure and flow rate of the nozzle are adjusted by the nozzle diameter, there is a problem in that the nozzle must be replaced frequently to prevent the above-mentioned erosion.

In addition, when using this high-pressure injection nozzle for actual civil engineering work, use one with a large inner diameter (low pressure) and high flow rate on soil such as cobblestone.
The amount of water moves the boulders into the soil and drives the stakes. In addition, if the soil is extremely hard, such as clay, use a nozzle with a small inner diameter (high pressure) and a low flow rate.
It is necessary to excavate the soil and drive piles. Therefore, it is necessary to select and use injection nozzles with different inner diameters.

In addition, the soil conditions at the work site are investigated in advance through test drilling and other methods.

[The problem that the idea aims to solve]

However, in actual work, test data often does not match, and it is necessary to prepare several types of injection nozzles and replace them each time they are used, and the pile driving conditions must also be changed each time. Therefore, replacing the injection nozzle was time-consuming and labor-intensive. Further, conventional injection nozzles have a one-piece structure, and the inner diameter of the nozzle easily wears out, resulting in poor durability, which means that the conditions of use cannot be satisfied and the nozzle must be replaced and discarded frequently.

Furthermore, when a durable material is used for the conventional injection nozzle, there are problems in that the product is large and expensive because of its integral structure, and it is economically disadvantageous because it must be replaced frequently.

Therefore, the present invention was proposed to solve the problem in view of the above facts, and its purpose is to make the nozzle part detachable and easy to replace, to be able to be attached and detached repeatedly, and to be durable. excellent in sex,
The object of the present invention is to provide a high-pressure injection nozzle that is small and highly economical.

[Means and actions to solve the problem]

In order to solve the above problems, in this invention,
A high-pressure injection nozzle used in a pile press-in device using a pressurized water circulation type injection pump that penetrates the ground vertically to excavate and drive piles, has an outer cylinder with a blind inner hole that is larger in diameter than the base end in the through hole. , an inner cylinder which is screwed onto the proximal end side of the blind inner hole of the outer cylinder and to which a water pipe can be connected to the proximal end side; and an inner cylinder which is sandwiched between the distal end of the inner cylinder and the blind inner hole of the outer cylinder. It is characterized by comprising a nozzle that can be freely attached and detached by engaging and disengaging a nut that is pressed and locks the threaded engagement between the inner cylinder and the outer cylinder.

Preferably, the nozzle is made of a superhard material.

By adopting the above configuration, the high-pressure injection nozzle of the present invention has a nozzle that is detachable, easy to replace when necessary, and can be repeatedly attached and detached.Moreover, the nozzle is made of a carbide material. In this case, wear is very low and durability is good.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

First, the state in which the high-pressure injection nozzle of the present invention is used in a pile press-in device using a circulating injection pump for civil engineering work will be explained.

FIG. 2 shows an example of excavating hard ground during driving of sheet pulp using a pile press-in device using a circulating injection pump for civil engineering work, in which the high-pressure injection nozzle of the present invention is used.

In FIG. 2, when performing piling work by statically press-fitting a sheet pile P into hard ground using a press-in machine 102 by suspending a crane 101, first muddy water circulates on the ground near the driving zone of the sheet pile P. A type injection pump 103 is installed. Further, a water tank 104 is placed on the ground near the muddy water circulation pump 103, and a water source S for supplying water to the water tank 104 is secured adjacent to the water tank 104. From this water source S to the water tank 104
Low pressure supply water pipe 10 with submersible pump 105 for supplying water to
6, and a mud water collection pipe 10 with a pump 107 is connected from the water tank 104 to the piling ground.
Plumb 8. Furthermore, mud water circulation injection pump 103
The inlet 10 of the pump device, which is located at the end of
3b, one end of the suction pipe 109 is connected, the other end is connected to the water tank 104, and one end of the high-pressure water supply pipe 110 is connected to the discharge port 103a of the pump device. A water pipe 111 having a high-pressure injection nozzle N according to the present invention attached to its tip is connected to the end.

When driving the sheet pile P into the hard ground after the piping described above, the sheet pile P that has been carried in advance to the planned pile driving position by the crane 101 is placed in the press-in machine 1.
When the pump operation of the muddy water circulation pump 103 is started while the pump is gripped with the chucking device (not shown) of 02, the source water in the water tank 104, which was initially introduced from the water source S, is sucked in from the suction port 103b. With the discharge operation from the discharge port 103a, high-pressure water is injected from the high-pressure injection nozzle N of the present invention at the tip, and the ground corresponding to the lower end position of the pile P is excavated. This muddy water V
is collected into the water tank 104 through a muddy water collection pipe 108 equipped with a pump 107. Therefore, immediately after this, the injection of high-pressure water during excavation, the reuse of the muddy water V by its recovery, and the replenishment submersible pump 105 for replenishing the insufficient water will smoothly and easily perform the excavation with high-pressure water and the pushing operation of the injection machine 102. Perform pile driving work by static press-fitting into hard ground.

Next, the specific structure of the high pressure injection nozzle N of the present invention will be explained.

1A in FIG. 1 is a side sectional view of the high-pressure injection nozzle N of the present invention, B in FIG. 1 is a view in the direction of the arrow A in FIG. 1, and C in FIG. 1D is another embodiment of only the nozzle shown in FIG. 1A.

In A, B, and C of Fig. 1, a through hole is bored in the outer cylinder 1, and a blind inner hole 1a with a larger diameter than the base end is bored, and the inner cylinder 3 is inserted into the inner hole 1a of the base end. The threaded portion 4 allows for screwing. The nozzle 2 is squeezed between the tip of the inner cylinder 3 and the blind inner hole 1a of the outer cylinder 1, and in order to further tighten the nozzle 2, the inner cylinder 3 is screwed into the outer cylinder 1 with a lock nut 5. It is screwed on and locked at part 6.

Therefore, when the high-pressure injection nozzle of the present invention is used, since the nozzle 2 is tightly fitted into the inner cylinder 3, it does not move up and down and has exactly the same effect as a conventional nozzle. Ru.

A through hole 3a through which pressurized water passes is bored in the inner cylinder 3, and an inner hole 2b having a tapered inclined hole 2a through which pressurized water passes through the nozzle 2 as well.

The diameters of the inner hole 2b of the nozzle and the through hole 3a of the inner cylinder may be determined in the same way as the diameters used in conventional nozzles.

In this way, the high-pressure injection nozzle of the present invention does not have an integral structure like conventional injection nozzles, but by loosening the lock nut 5, the inner cylinder 3 and nozzle 2 can be attached and detached from the outer cylinder 1.
Even if the inner hole 2b is worn out by pressurized water, it can be easily replaced.

Furthermore, since the nozzle 2 is made of a carbide material such as ceramic or cemented carbide, the inclined hole 2a
The inner hole 2b has very little wear and can withstand long-term use.

Note that a water pipe 111 is installed on the outer periphery 3b of the base end of the inner cylinder 3.
Used with.

D in Fig. 1 is an example of another nozzle 2' in which the inclined hole and inner hole are larger than the one inserted in A in Fig. 1. You can use ivy. That is, in that case, only the nozzle 2 needs to be replaced.

In addition, in A and D of FIG. 1, 7a to 7
e is an O-ring.

With this configuration, the force of high-pressure water acting on the nozzle 2 is received by the shoulder of the blind inner hole 1a of the outer cylinder 1, and since the tip of the inner cylinder 3 is in close contact with the base end of the nozzle 2, Since no load is directly applied to the threaded portions 4 and 6 and they are locked by the lock nut 5, they are tightened. Therefore, since no load is directly applied to the threaded portions 4 and 6, the nozzle 2 can be repeatedly attached and detached without damaging the threaded portions.

[Effect of idea]

The high-pressure injection nozzle of this invention does not have an integrated structure like the conventional one, but the nozzle is removably fitted into the outer cylinder, so it can be easily replaced when the nozzle is changed due to excavation processing conditions or due to nozzle wear. and can respond on the spot. The nozzle can be repeatedly replaced semi-permanently. It also reduces replacement costs. Furthermore, when the nozzle is formed in a small size, it has excellent abrasion resistance, allows for strict quality control, and provides high precision without product variation.

Even if wear occurs on the surfaces of the inclined hole and inner hole of the nozzle, only the nozzle needs to be replaced, so it is economical and can be replaced in a short time.

The nozzle can be easily replaced depending on the work site conditions, and it is also easy to handle when storing and transporting because it is small and lightweight.

[Brief explanation of the drawing]

FIG. 1A is a side sectional view of the high-pressure injection nozzle N of the present invention, FIG. 1B is a view taken in the direction of the arrow in FIG. 1A, FIG. This is another embodiment of only the inner cylindrical portion shown in FIG. 1A. FIG. 2 shows an example of excavating hard ground when driving sheet piles using a pile press-in device using a circulation type injection pump for civil engineering work in which the high-pressure injection nozzle of the present invention is used. FIG. 3 is a side sectional view of a conventional excavating pressure water injection nozzle. 1... Outer cylinder, 2... Nozzle, 3... Inner cylinder, 4,
6...Screw part, 5...Lock nut, 101...
Crane, 102...Press-in machine, 103...Mud water circulation injection pump, 104...Water tank, 111...
...Water pipe, N...High pressure injection nozzle, P...Sheet pile.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a high-pressure injection nozzle used in a pile press-in device using a pressure water circulation type injection pump that enters the ground vertically to excavate and drive piles, An outer cylinder having an inner hole with a blind diameter, an inner cylinder that is screwed onto the proximal end of the blind inner hole of the outer cylinder, and a water pipe can be connected to the proximal end of the outer cylinder, and a distal end of the inner cylinder. A high-pressure injection nozzle comprising a nozzle and a nozzle that can be freely attached and detached by engaging and disengaging a nut that is pressed into a blind inner hole of the outer cylinder and locks the screwing of the inner cylinder and the outer cylinder. (2) The high-pressure injection nozzle according to claim 1, wherein the nozzle is made of a superhard material.