JP6915796B2 - Nozzle for water jet drilling - Google Patents

Description

The present invention relates to a nozzle constituting a drilling device used in a water jet method.

As a method of drilling a concrete structure or the like, a drilling device using a waiter jet is known.

As a drilling device using a water jet, the device described in the following patent documents is known.
Patent Document 1 discloses a cutting method using a waiter jet in which an injection nozzle rotates by itself due to an eccentric jet of a cutting fluid.

Japanese Unexamined Patent Publication No. 5-131399

However, the drilling apparatus described in Patent Document 1 has the problems described below.
(1) In order to discharge the excavated earth and sand through the gap between the drive motor and the outer cylinder, the outer diameter of the drive motor must be one size smaller than the diameter of the drilled portion.
(2) If the water pressure of high-pressure water is increased, the rotation speed of the nozzle also increases, so that it is not suitable for the usage method of efficiently drilling holes by suppressing the rotation speed at high pressure.

Therefore, an object of the present invention is to provide a nozzle for drilling a water jet that can control the rotation speed of the nozzle without being affected by the water pressure of the water jet.

The first invention of the present application, which has been made to solve the above problems, is a rotor having a swivel connected to a high-pressure hose, a rotor housed in the swivel, and a communication passage for passing high-pressure water from the high-pressure hose, and the rotor. and fixed, at least comprising a head, wherein the head emits high pressure water from said communication path from the tip, and drilling a discharge passage, high pressure water from the communication passage, the rotational force to the head The swivel has a self-rotating discharge path, which is provided and discharged in a direction containing a component on the rear side of the head to discharge drilling debris , and the swivel is in contact with the rotor, a bearing and the bearing. A water jet having an oil filling portion for supplying oil to the water jet, and the rotation speed of the head can be adjusted by adjusting the viscous resistance of the oil filled in the oil filling portion. A nozzle for drilling is provided .

According to the present invention, the effects described below are obtained.
(1) Since the rotation speed of the nozzle can be controlled by the oil filled in the oil filling portion, the rotation speed of the nozzle can be controlled without being affected by the water pressure of the water jet. Therefore, it is possible to carry out an efficient drilling method that suppresses the rotation speed at high pressure.
(2) By configuring the water discharge from the self-rotating discharge path so as to face the rear side of the head, the discharge of excavation waste by the water jet is promoted.

The schematic diagram of the nozzle for drilling a water jet which concerns on this Example.

Hereinafter, examples of the present invention will be described with reference to the drawings.

<1> Overall Configuration FIG. 1A is a schematic side view of a nozzle for drilling a water jet according to the present invention.
The water jet drilling nozzle according to the present invention includes at least a swivel 10, a rotor 20, and a head 30.
The details of each component will be described below.

<2> Swivel The swivel 10 is a member for accommodating a rotor 20 connected to a head 30 that freely rotates about a drilling direction of a drilling nozzle as a rotation axis.
In this embodiment, the connection portion 11 with the high pressure hose A is provided on one end side of the swivel 10, and the rear end of the rotor 20 is accommodated in a rotatable state via a bearing 12 arranged inside the swivel 10 on the other end side. is doing.

<3> Oil filling portion / oil seal The swivel 10 is provided with an oil filling portion 13 for supplying oil to the bearing 12 and an oil seal 14 for preventing oil from leaking from the oil filling portion 13. Further prepared.
In this embodiment, two oil seals 14 are arranged along the outer circumference of the rotor 20 so as to sandwich the bearing 12 from the front-rear direction of the nozzle.
The region surrounded by these two oil seals 14 is the oil filling portion 13.

An injection port 15 leading to the oil filling portion 13 is formed on the outer surface of the swivel 10, and by injecting oil from the injection port 15, the oil filling portion 14 can be filled with oil.

With the above configuration, by changing the type and filling amount of oil to be filled in the oil filling portion 13, the viscous resistance of the oil supplied to the bearing 12 is adjusted, and the rotor 20 rotating inside the swivel 10 and eventually the rotor 20 The rotation speed of the head 30 to be fixed can be adjusted.

<4> Rotor The rotor 20 is a member provided at the rear end of the head 30 and a part or all of the rotor 20 rotates in the swivel 10.
Inside the rotor 20, a communication passage 21 for passing high-pressure water from the high-pressure hose A is provided.
The casing 16 arranged inside the swivel 10 is housed in the communication passage 21.
Inside the casing 16, a pipeline 161 connected to the high-pressure hose A is provided, and the conduit 161 can be connected to the communication passage 21 to allow high-pressure water to pass therethrough.
Further, inside the rotor 20, a packing 22, an O-ring (not shown), or the like for stopping water in the gap between the casing 16 and the communication passage 21 is provided.

<5> Head The head 30 is a member for discharging high-pressure water for drilling holes in concrete.
The rear end of the head 30 is fixed to the tip of the rotor 20, and the structure is such that the rotation of the head 30 is transmitted to the rotor 20.
Further, the head 30 is provided with two types of discharge paths, a hole-drilling discharge path 31 and a self-rotating discharge path 32, which discharge high-pressure water from the rotor 20.
The details of each discharge path will be described below.

<5.1> Drilling discharge path The drilling discharge path 31 is an element for discharging high-pressure water from the communication passage 21 of the rotor 20 from the tip of the head 30 to perform concrete drilling.
In the present invention, the number of hole-drilling discharge passages 31, the water discharge locus, and the like are not particularly limited and can be appropriately selected.
In this embodiment, three types of drilling discharge paths 31 having different trajectories so that the outlets from the nozzle tips are different are provided.

<5.2> Self-rotating discharge path The self-rotating discharge path 32 has a function of giving rotational force to the head 30 itself by discharging high-pressure water from the communication passage 21 of the rotor 20 from the side of the head 30. Is an element that contains at least.
In addition, the self-rotating discharge path 32 can also function as a means for promoting the discharge of the drilled waste, which promotes the discharge of the drilled waste to the rear side of the nozzle, if necessary.
The details of each function will be described below.

<5.2.1> Self-rotation function FIG. 1B is a schematic view of the head 30 as viewed from the tip end side of the nozzle.
In this embodiment, three outlets of the self-rotating discharge path 32 are provided so that outlets are evenly provided at 120 ° on each side of the nozzle.
Further, the high-pressure water discharge angle θ ₁ by the self-rotating discharge path 32 when viewed from the tip side of the head 30 is inclined by a certain angle with respect to the tangent line at the outlet of the self-rotating discharge path 32. Configure to.
The discharge angle θ ₁ may be set to about 0 ° to 30 °, and may be appropriately set so as to have a preferable rotation speed in combination with the design of the oil filling portion 13 described above according to the conditions of the construction site.
The nozzle will rotate by itself due to the water discharged from the self-rotating discharge path 32.

<5.2.2> Discharge promotion function The self-rotating discharge path 32 according to the present invention further provides a function of promoting the discharge of drilling debris by including a component on the rear side of the head 30 as a water discharge direction. Can be done.
As shown in FIG. 1A, in this embodiment, the self-rotating discharge path 32 is configured to be inclined by a certain angle toward the rear side of the nozzle with respect to the vertical direction in FIG. 1A. is doing.
When the release angle theta ₂ is increased, it will then drilling the side wall of the drilling unit, since it may affect the drilling diameter, emission angle theta ₂ is a 10 ° to 45 ° approximately, and construction site conditions, The preferred angle may be appropriately set in consideration of the relationship with the emission angle θ _{1 described above.}
By discharging water from the self-rotating discharge path 32, drilling debris generated when performing drilling work by discharging water from the self-rotating discharge path 32 can be sent to the rear side of the nozzle, and drilling from the drilled portion. It is possible to promote the discharge of pore waste.

10 Swivel 11 Connection 12 Bearing 13 Oil filling 14 Oil seal 15 Injection port 16 Casing 161 Pipeline 20 Rotor 21 Communication passage 22 Packing 30 Head 31 Drilling discharge path 32 Self-rotating discharge path A High-pressure hose

Claims (1)

A swivel that connects to a high pressure hose,
A rotor housed in the swivel and having a communication passage through which high pressure water from the high pressure hose passes.
At least a head, which is fixed to the rotor, is provided.
The head
A hole-drilling discharge path that discharges high-pressure water from the communication passage from the tip,
The high-pressure water from the communication passage, for discharging the drilling debris and released in a direction including the rear side of the component of giving and the head a rotational force to the head, anda self rotating discharge path,
The swivel
Bearings that come into contact with the rotor,
It has an oil filling section that supplies oil to the bearing.
The rotation speed of the head can be adjusted by adjusting the viscous resistance of the oil to be filled in the oil filling portion.
Nozzle for water jet drilling.

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