JPH01111986A - Drilling method and device - Google Patents

Abstract

PURPOSE: To increase boring speed by bringing close to the subject of boring one or more pairs of jet nozzles oppositely disposed about a rotational axis, ejecting high-pressure water containing abrasives from the jet nozzles, and reversing the rotational axis every about half rotation. CONSTITUTION: This apparatus 10 comprises an apparatus main body 12 with a revolving shaft 16 freely slidably and rotatably attached thereto, and a rotary head 22 having a pair of abrasive nozzles 20 and attached to the end of a high-pressure water feed path 18, with a shaft 16 connected to a torque actuator 28. The apparatus 10 is fixed inside a sewer, with the nozzles 20 brought close to interior walls, and the actuator 28 is driven. Water whose pressure is built up, from a high-pressure water generating mechanism 48, is fed to a nozzle 56 and mixed with abrasives from a supply pipe 62 communicated to an abrasive tank 24, this mixture being ejected from the nozzles 20; the nozzles 20 are reversed every half rotation to cut a connecting hole part. Therefore, boring can be performed quickly.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a drilling method and device,
- Layer In detail, the present invention relates to a drilling method and device suitable for drilling a connecting hole for a small-diameter pipe from within a large-diameter pipe when connecting a large-diameter pipe and a small-diameter pipe.

[Prior art and its problems]

Conventionally, when connecting a large diameter pipe and a small diameter pipe, for example,
The method of connecting branch pipes that connect to each home to the main sewer pipe buried underground is to excavate the soil cover to expose the main sewer pipe, and then open a branch pipe connection hole in the main pipe from the outside. The so-called open cut construction method, in which branch pipes are then inserted and connected, is widely used.

However, due to the increasing density of urban areas, this oven-cut construction method is inefficient because the work time is limited to nighttime or when traffic is light, and construction costs are high. A method of drilling branch pipe connecting holes even from inside the main pipe with a small diameter that cannot be accessed by workers by inserting a mechanical rotary drilling device and remotely controlling this mechanical rotary drilling device has begun to be implemented. However, this method has various problems, such as not only the maintenance and management of the equipment including wear of the drill is troublesome, but also the handling operation is complicated and requires a skilled worker.

[Means for solving problems]

Therefore, in the present invention, at least a pair of injection nozzles arranged facing each other around the rotation axis are brought close to a perforated object such as a sewer main pipe, and then high-pressure water containing an abrasive is injected from these injection nozzles to the perforated object. At the same time, the drilling is attempted by reversing the rotating shaft approximately every half turn.

In this case, before jetting high-pressure water containing an abrasive from the jet nozzle, pressurized air is jetted through the abrasive supply system, and the abrasive itself is also pressurized and supplied to the jet nozzle to make the drilling work smoother. It can be done quickly.

Further, if the injection nozzle is held at a predetermined angle with respect to the drilling surface of the object to be drilled, it is convenient when drilling an inclined hole that is inclined with respect to the axial direction.

On the other hand, as a device for carrying out this method, a pivot shaft is slidably and rotatably attached to the main body of the device via a swivel joint, a high-pressure water supply path is formed in the axial direction of the pivot shaft, and the high-pressure water supply channel is A rotary head having at least a pair of injection nozzles is attached to the end of the rotating head, an abrasive supply system is connected to these injection nozzles, and the rotating shaft is driven to reverse approximately every half rotation via a sliding mechanism. Preferably, it is constructed by connecting to a mechanism.

In this case, if the abrasive supply system is configured to selectively supply pressurized air or pressurized abrasive to the injection nozzle through the supply pipe by the action of the pressurizing device, it is possible to This can effectively prevent solidification of the abrasive material caused by part of the jet water entering the supply pipe.Furthermore, the jet nozzle can be attached to the rotating head in a replaceable manner, and the main body of the device can be moved and held. If it is configured to be pivotably supported relative to the means, 1. Connecting holes inclined in the radial or axial direction can be easily drilled.

〔Example〕

Next, the drilling method according to the present invention will be explained in detail in relation to the apparatus thereof with reference to the accompanying drawings.

1 to 3, a drilling device 10 according to the present invention has a swivel joint 14 disposed in a main body 12 of the device, and a pivot shaft 16 of the pivot joint 14 that is slidably rotatable. A rotary head 22 equipped with a pair of abrasive jet nozzles 20.20 is attached to the end of the high-pressure water supply path 18 disposed at 16, and an abrasive supply system 24 is attached to these jet nozzles 20.20. , and furthermore, the pivot shaft 16 is basically configured to be connected via a sliding mechanism 26 to a torque actuator 28 which is set to be reversed approximately every half rotation. In this case, each abrge-pull injection nozzle 20 is connected to the rotating head 22 by attaching and detaching the stopper 21.
It is constructed so that it can be replaced as appropriate.

The swivel joint 14 is located between a bush 32 and a seal presser member 34 attached to the lower end of a pivot shaft 16 inserted into a casing 30 that is fixedly held on the device main body 12, and a flange portion 36 of the casing 30. A seal chamber 38 is formed in the rotating portion of the casing 30 and the pivot shaft 16. At both ends of the seal chamber 38, a ring-shaped metal seal member, a carbon seal member, a lamella seal member made of flexible synthetic resin, etc., and a seal guide ring are sequentially stacked from the end side. The layered seals 40 and 42 configured by this are arranged, and a pressing coil spring 46 set to a predetermined elastic coefficient is inserted in the spaced apart portion 44 of the layered seals 40 and 42, so that the layered seals 40 and 42 are moved toward both ends of the seal chamber 38. It is configured to be elastically pressed and held.

Further, a supply pipe 50 communicating with the high pressure water generation mechanism 48 is provided at a position corresponding to the seal chamber separation part 44 of the casing 30.
On the other hand, end openings 18a and 18b of the high-pressure water supply path 18 are opened at a position corresponding to the seal chamber separation part 44 of the pivot shaft 16, and the end of this supply path 18 is The rotating head 22 is connected via a branch 52 to a pair of water jet injection nozzles 56,56.

In addition, these water jet injection nozzles 56.56
A chamber 58 formed between the abrasive injection nozzle 20.20 is filled with pressurized air or a pressurized abrasive material such as garnet, which is selectively supplied by the action of a pump device 60. A supply pipe 62 of the supply system 24 is connected.

Therefore, the high pressure water supplied from the high pressure water generating mechanism 48 is transmitted from the supply pipe 50 to the spaced part 44 of the seal chamber 38 at one end of the open part 18.
a, 18b - high pressure water supply path 18 - reaches chamber 58 via branch path 52 and water jet injection nozzle 56, and in this chamber 58, the abrasive material supplied from supply pipe 62 is suction-mixed by negative pressure, and further each It will be understood that high-pressure injection is performed from the abrasive injection nozzle 20.

Further, the sliding mechanism 26 is provided with an operating member 66 that accommodates a plurality of steel balls 64 at the end of the pivot shaft 16, and is formed concentrically with the pivot shaft 16 at the end of the casing 30 and is provided with a peripheral A member 70 is provided on the bearing having a guide groove 68 tapered in the direction, and when transmitting the rotational force of the torque actuator 28 to the rotating shaft 16 via the sprocket 72, the steel ball 64 is inserted along the guide groove 68. By moving it, the pivot shaft 16 is rotated and slid in the axial direction (see FIGS. 1 and 3).

In addition, in FIG. 1, reference numeral 74 indicates the device main body 12.
is a holding member that is pivotally connected to the operating mechanism 7A of a movable holding means such as a trolley via a shaft 76, and this holding member 74 is provided concentrically with respect to the shaft 76, for example, at intervals of about 15 degrees. The device main body 12 is held at a predetermined angle with respect to the movable holding means by a stopper 80 that is attached to the hole 7.

The procedure for drilling a connecting hole for a branch pipe C from inside a sewer wood pipe B using the apparatus of the present invention constructed as described above will be explained.

First, for drilling, a movable holding means such as a cart carrying the drilling device 10 is inserted into the sewer wood pipe B and fixed and held in a predetermined position by an appropriate means, and then a branch pipe C connected to the main sewer pipe B is opened. The axis of rotation of the rotary shaft 22 of the drilling device IO, that is, the axis of the pivot shaft 16, is aligned and fixed by the operation of the operating mechanism A, and the abrasive injection nozzle 20.20 is inserted into the inner surface of the sewer main pipe B. (see Figure 4a).

Next, while driving the actuator 28 to slide and rotate the rotary head 22, the abrasive injection nozzle 20.20
After setting the distance between the injection port and the inner surface of the sewer main pipe B to a predetermined value, preferably, the pump device 60 of the abrasive supply system 24 is operated to supply air pressurized to about 3 kg/c+J. It is fed via tube 62 and chamber 58 to an abrasive injection nozzle 20.20 for injection (see FIG. 4).

Next, the high pressure water generation mechanism 48 is driven to, for example, 60
Water whose pressure has been increased to about 0 kg/ad is fed under pressure from the supply pipe 50 - the separation part 44 of the seal chamber 38 -> the end openings 18a, 18b - the high pressure water supply path 18 and the branch path 52 to each water jet injection nozzle 56. The switching valve of the abrasive supply system 24 is operated to establish communication between the abrasive tank and the supply pipe 62. Then, the abrasive material is sucked from the supply pipe 62 into the chamber 58, which has a negative pressure due to the passage of the high-pressure water, and is mixed with this high-pressure water.
The abrasive water jet from the abrasive injection nozzle 20.20 is injected into the connection position of the branch pipe C while reversing every half rotation to cut the connection hole (
(See Figure 4C).

In addition, if the branch pipe C connected to the water main pipe B is not connected horizontally as described above, for example, as shown in FIG.
When branch pipe C is connected to the upper half of water main pipe B, after setting the distance between the injection port of abrasive injection nozzle 20.20 and the inner surface of sewer main pipe B to a predetermined value, and before drilling The pump device 60 of the abrasive supply system 24 is operated to supply air pressurized to about 3 kg/- to the abrasive injection nozzle 2 through the supply pipe 62 and the chamber 5B, including during interruptions.
If the water is constantly supplied at a temperature of 0.20 mm, it will be ensured that inconveniences such as a part of the jet water entering the supply pipe 62 due to the influence of gravity and solidifying the abrasive material before and after the start of drilling work and when the work is interrupted will be avoided. This allows smooth drilling work to be achieved.

In addition, as shown in FIG. 6, when the branch pipe C is connected to the main water pipe B in a state inclined at a predetermined angle with respect to the axis line of the main water pipe B, a stopper 80 is attached to a predetermined hole 78.
an abrasive injection nozzle 2 which is held tilted at a predetermined angle with respect to a moving and holding means and which is disposed on a rotating head 22;
0.20 as appropriate by operating the stopper 21 and setting the distances between the injection ports of both injection nozzles 20.20 and the inner surface of the sewer main pipe B to be approximately equal (see Fig. 6b),
Drilling work can be performed reliably and quickly in the same way as in a normal case.

〔Effect of the invention〕

As mentioned above, according to the drilling method and device of the present invention, not only can connecting holes for small diameter pipes be easily and quickly drilled from inside large diameter pipes, but also handling operations including maintenance management of the drilling equipment can be performed easily and quickly. It can also be made easier. Further, since it is possible to suitably deal with various conditions for connecting a small diameter pipe to a large diameter pipe, the drilling work can be carried out extremely efficiently. Furthermore, the swivel joint in the device allows the layered seal to be pressed against the inner surface of the sealing chamber by the action of a pressing coil spring and high-pressure water, so the sealing chamber can be reliably sealed, and the sealing chamber is maintained at an equal pressure by the flow of high-pressure water. Therefore, even if high-pressure fluid is injected from the injection nozzle without reciprocating the rotation axis and reciprocating in the thrust direction, leakage can be reliably prevented, and the wear is evened out, so it is durable. It has various advantages such as being able to improve properties.

The drilling method according to the present invention has been described above using preferred embodiments in relation to the device, but the present invention is not limited to this embodiment. Of course, various modifications can be made without departing from the spirit of the present invention, such as being suitable for use as a method and device for subsequently drilling holes for pipe insertion in walls and the like.

[Brief explanation of the drawing]

1 is an explanatory cross-sectional view of a preferred embodiment of the apparatus for carrying out the method of the present invention, FIG. 2 is an explanatory cross-sectional view taken along the line n-■ in FIG. 1, and FIG. 3 is an explanatory cross-sectional view taken along the line m-m in FIG. Cross-sectional explanatory diagrams, Figures 4a to 4C
The figure is an explanatory diagram of the procedure when performing a drilling operation using the device shown in FIG. 1, and FIGS. 5, 6a, and 6b are explanatory diagrams when performing another drilling operation using the apparatus shown in FIG. 1. . 10...Drilling device, 12...Device body, 14
...Swivel joint, 16...Swivel axis, 18...
High-pressure water supply path, 20... Abbreviation pull injection nozzle, 22... Rotating head, 24... Abrasive material supply system, 26... Sliding mechanism, 28... Actuator, 30... Casing, 32 Button, 34...pressing member,
36... Flange section, 38... Seal chamber, 40.4
2... Layered seal, 44... Separation part, 46
... Coil spring, 48 ... High pressure water generation mechanism, 50.
... Supply pipe, '52 ... Branch path, 56 ... Water jet injection nozzle, 58 ... Chamber, 60 ... Pump device, 62 ... Supply pipe, 64 ... Steel ball, 66 ...operating member,
68... Guide groove, 70... Receiver is member, 7
2... Sprocket, 74... Holding member, 7
6...shaft, 78...hole, 80...stop, applicant Sanki Seikosho Co., Ltd.

Claims (7)

[Claims] (1) At least a pair of injection nozzles arranged facing each other around the rotational axis are brought close to the object to be drilled, and then high-pressure water containing an abrasive is injected from these injection nozzles, and the rotational axis is reversed approximately every half turn. A drilling method characterized by: (2) The drilling method according to claim 1, which comprises injecting pressurized air through an abrasive supply system before injecting high-pressure water containing an abrasive. (3) The drilling method according to claim 1 or 2, which comprises supplying pressurized abrasive material to an injection nozzle. (4) Claims 1 to 3 consist of drilling by holding the injection nozzle at a predetermined angle with respect to the object to be drilled.
The drilling method described in any of the paragraphs. (5) A pivot shaft is slidably and rotatably attached to the main body of the device via a swivel joint, and a high-pressure water supply path is formed in the axial direction of the pivot shaft, and at least one pair of jets are provided at the end of the high-pressure water supply channel. A rotary head equipped with nozzles is attached, an abrasive supply system is connected to these injection nozzles, and the pivot shaft is further connected via a sliding mechanism to a drive mechanism that rotates in reverse approximately every half rotation. drilling equipment. (6) The drilling device according to claim 4, wherein the abrasive supply system has a supply pipe that selectively supplies pressurized air or pressurized abrasive to the injection nozzle by the action of a pressurizing device. . (7) Claims 5 or 6 consist of attaching the injection nozzle to the rotary head in a replaceable manner and pivoting the main body of the device to the movable holding means so as to be tiltable.
The perforating device described in Section.