JP2009052916A - Boring apparatus with function to verify pressure in pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boring apparatus with a function to verify the pressure in a pipe and a constitution capable of verifying the pressure in a pipe simultaneously with boring work by simple operations regardless of the type of a gas conduit. <P>SOLUTION: The boring apparatus with a function to verify the pressure in a pipe includes a boring adaptor 11 and a stroke regulating member 13. The boring adaptor 11 has a saddle part 10 mounted to the outer circumferential surface of a conduit P; a saddle case 11A integrally provided for the saddle part 10 and having a rotating shaft 12 inserted inside; and a boring cutter 16 provide for a shaft end of the conduit P in the axial direction of the rotating shaft 12. The stroke regulating member 13 can be attached to and removed from between a top part of the boring adaptor 11 and a retaining ring on the side of the rotating shaft 12. The stroke regulating member 13 reverses itself in its axial direction to oppose its end part, which regulates the amount of entry to a degree slightly protruding into an embedded pipe P, to the retaining ring 18 and can detect pressure changes by a member 20 for detecting pressure fluctuations from the inside of the embedded pipe P simultaneously with boring. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a piercing device with an in-tube pressure confirmation function, and more particularly to an apparatus used for piercing processing when confirming the in-tube pressure.

  There is a leak test as a way to check the pressure in pipes such as gas pipes buried under the road.

  For example, in addition to cast iron pipes and steel pipes being used as gas conduits, there are types called pipe-in pipes with resin pipes such as polyethylene pipes installed for the purpose of preventing leakage due to aging of these pipe materials (for example, Patent Document 1).

Except in the case of the pipe-in-pipe, the gas conduit is required to be periodically inspected for leaks according to regulations (Ministerial Ordinance), and the pipe pressure is confirmed during this inspection.
For this inspection, confirm the position of the gas pipe embedded based on a pre-stored laying route map etc. by magnetic exploration, etc., for example, drill inspection holes at multiple locations along the laying direction from the ground. In some cases, a gas conduit is drilled in the inspection hole to observe a pressure difference between the inspection positions (for example, Patent Document 2). Further, instead of observing the pressure difference between the inspection positions, the presence or absence of leakage at the inspection position may be directly observed.

JP 2002-213648 A JP 2000-180288 A

  In-pipe pressure confirmation work such as gas leakage inspection includes inspections conducted in an emergency such as when a leakage accident occurs in addition to periodic inspections.

  Even in this case, if the buried location is predicted based on the above-mentioned laying route map, the buried pipe is searched from the ground at the position considered to be the leak location, and the presence of the buried gas conduit is confirmed, A leak inspection is conducted by excavating.

  However, there may be pipes that diverge from the gas conduits shown in the laying path diagram. In this case, the type of pipe is the above-mentioned iron even if magnetic survey from the ground is used. It may not be clear whether the pipe is made of material or pipe-in-pipe.

  In the case of a pipe-in-pipe type pipe, it is necessary to prevent damage to the polyethylene pipe, unlike when drilling a cast iron pipe or a steel pipe. In other words, when drilling a cast iron pipe or a steel pipe, the peripheral wall of the pipe material is penetrated and a pressure extracting member is installed in the through hole. However, when the polyethylene pipe is installed, the peripheral wall of the cast iron pipe or the steel pipe is removed. If the perforation cutter is inserted with a penetrating stroke, the polyethylene whose outer peripheral surface is located in the vicinity of the inner peripheral surface of the cast iron pipe or steel pipe may be damaged by mistake.

  For this reason, considering that the pipe-in-pipe method may not be known, it is difficult for the operator to easily determine the feed cost of the drilling cutter during drilling. There was a risk of new leaks occurring from the deterioration of workability at the time of leak inspection and from the polyethylene pipes that were not originally leaked.

  In view of the problems in the drilling work performed at the time of the above-described conventional pipe pressure check, the object of the present invention is to confirm the pressure in the pipe that enables drilling to check the pressure in the pipe by a simple operation regardless of the type of the pipe line. It is to provide a punching device with a function.

In order to achieve this object, the present invention has the following configuration.
(1) An apparatus used in a drilling process for confirming the pressure in a pipeline,
A saddle portion mounted on the outer peripheral surface of the pipe line and a saddle case provided integrally with the saddle portion and having a rotation shaft inserted therein, and the embedded pipe side in the axial direction of the rotation shaft A drilling adapter with a drilling cutter provided at the shaft end;
Between the end of the saddle case facing the opposite end and the retaining ring attached to the opposite end of the perforation cutter mounting side end of the rotary shaft in the perforation adapter A stroke defining member that is detachably mounted on the rotary shaft;
A take-out pipe communicating with the inside of the saddle case through an opening formed on a side surface of the saddle case;
The stroke defining member has a length along the axial direction of the rotating shaft, and corresponds to a stroke that allows the tip of the perforating cutter to slightly protrude from the inner surface of the peripheral wall of the buried pipe to form a gas flow path. And is provided with a penetrating defining portion including a recess for allowing the retaining ring to enter the position where the perforating cutter can penetrate the peripheral wall of the buried pipe at one end in the axial direction. Drilling with a pressure check function in a pipe, wherein the movement stroke of the drilling cutter can be changed to a stroke penetrating the peripheral wall of the buried pipe and a stroke slightly protruding from the inner surface of the peripheral wall by switching the facing state apparatus.

  (2) The pressure in the pipe according to (1), wherein a pressure detecting member having a scale portion whose advance / retreat amount is set by the pressure of the leakage medium from the pipe is connected to the take-out pipe. Drilling device with confirmation function.

  (3) The buried pipe leakage inspection device according to (1) or (2), wherein a pipe intended for a gas flow path is used as the pipe.

  According to the present invention, the stroke defining member is inverted in the axial direction, the end opposite to the recess is set to face the retaining ring of the rotating shaft, the rotating shaft is rotated, and the perforating cutter is moved into the pipeline. It is possible to obtain a state in which the cutting edge of the perforating cutter slightly protrudes from the inside of the peripheral wall of the pipe line simply by making it approach toward. As a result, the inside of the pipe line and the inside of the adapter case having the take-out pipe can be communicated with each other, so that even when the pipe is a pipe-in-pipe type pipe line, the drilling cutter does not reach the polyethylene pipe that is built in. It is possible to confirm the pressure inside the pipe for the pipe having the polyethylene pipe without damaging the inner pipe, almost simultaneously with the drilling operation.

Hereinafter, the best mode of the present invention will be described with reference to the embodiments shown in the drawings.
FIG. 1 is a view showing a state before and after drilling with a center line L as a boundary, in order to explain the overall configuration of the drilling device with an in-pipe pressure confirmation function according to the present invention together with the operation.
The lower side of the center line L shows a state before drilling at the time of drilling work, and the upper side of the center line L shows a state after drilling at the time of leakage inspection. Precede that.

  In FIG. 1, a perforating apparatus 1 with a pressure checking function in a pipe is integrated with a saddle portion 10 that is mounted on an outer peripheral surface of a buried pipe P (hereinafter, described as a target for the buried pipe P), which is one of pipes. A perforated adapter 11 attached, a stroke defining member 13 detachably provided on a rotary shaft 12 provided in the perforated adapter 11, and a take-out pipe 14 made of an elbow connected to the perforated adapter 11. It has.

  As shown in FIG. 2, the piercing adapter 11 includes a hollow adapter case 11 </ b> A in which a rotating shaft 12 that can be advanced and retracted with respect to the buried pipe P is inserted, and is formed on the outer peripheral surface on the buried pipe P side. The saddle portion 10 (see FIG. 1) is fastened and integrated with the screw 11A1.

  The saddle portion 10 is a member that is attached to and fixed to the buried pipe P by hanging a chain (not shown) that is hooked on the support base 10A projecting in the circumferential direction of the buried pipe P around the peripheral surface of the buried pipe P. And a seal member 15 made of a flexible member such as rubber that can be depressed into the support base 10A side by a tightening force when the chain is latched is provided on the surface facing the outer peripheral surface of the buried pipe P. When 15 is depressed, the support base 10A is brought into close contact with the outer peripheral surface of the buried pipe P so as to seal the mounting position of the buried pipe P together with the seal member 15.

  The rotating shaft 12 inserted into the adapter case 11A is rotationally driven by a driving device such as an electric motor (not shown). In this embodiment, for example, in addition to drilling the buried pipe P, a branch pipe is connected. The thing of the structure which can form the tapping screw used in the case is used. For this reason, a tapping member 16 made of a hole saw or the like is integrated with the rotary shaft 12 at the shaft end of the rotary shaft 12 on the buried pipe P side, and at the rear of the drilling cutter 16 in the perforating direction. Yes.

  The perforation cutter 16 is provided with a plurality of openings 16A on the peripheral surface. As will be described later, when the punching cutter 16 protrudes into the buried pipe P, the leakage target in the buried building P is placed inside the adapter case 11A. You can enter. Note that the number of openings 16A is not limited to a plurality, and may be set as appropriate, such as when the number of openings 16A is single or when the formation positions are evenly distributed.

  The tapping member 17 is integrated with a guide portion 17A having a center coinciding with the radial center of the adapter case 11A, and can be moved forward and backward without upsetting the rotation center during the forward and backward movement of the rotary shaft 12. It is like that.

  The shaft end opposite to the shaft end on which the perforation cutter 16 is provided in the axial direction of the rotary shaft 12 is connected to the drive device (not shown) at the end of the shaft end. A chamfered portion 12A is provided, and a retaining ring 18 is fitted in the vicinity of the chamfered portion 12A.

  The retaining ring 18 is a member that is used when the approaching amount of the rotating shaft 12 to the buried pipe P side is regulated by coming into contact with a stroke defining member 13 described later.

  The stroke defining member 13 is detachably provided on the rotary shaft 12 between the retaining ring 18 and the head portion 11A2 of the adapter case 11A opposite to the retaining ring 18.

FIG. 3 is a diagram illustrating the configuration of the stroke defining member 13, and in the drawing, the stroke defining member 13 is configured by a half-divided divided body 130 having a space surrounding the rotation shaft 12, and each divided body 130. The members are supported by a hinge 19 that is always closed by a biasing member such as a string spring (not shown). As a result, the hinge 20 is closed with the initial behavior so as to cover the outer peripheral surface of the rotating shaft 12 with the hinge 19 opened, so that the axial end of the rotating shaft 12 faces the rotating shaft 12.
The stroke defining member 13 is formed with a recess 13A on the inner surface on one end side in the axial direction.
The concave portion 13A has a depth corresponding to the entry stroke of the punching cutter 16 for penetrating the peripheral wall of the cast iron pipe or the steel pipe, and the inner diameter at which the retaining ring 18 does not interfere with the inner surface to allow entry. The through-use defining portion is formed.

  On the other hand, the end of the stroke defining member 13 opposite to the end where the concave portion 13A is located, as shown in FIG. It is set as the edge part which can set the approach amount (amount shown with the code | symbol S in FIG. 1) which protrudes slightly from the inner surface of the buried pipe P. As shown in FIG. For this reason, in this embodiment, as the axial length of the stroke defining member 13, the state shown in FIG. 3B, that is, when the retaining ring 18 hits the end opposite to the recess 13A, The length of the cutter 16 is set such that a stroke that allows the tip of the cutter 16 to protrude about 1 mm from the inner surface of the buried pipe P is obtained.

  The reason why the cutting edge of the perforating cutter 16 sets a slight protrusion amount of about 1 mm inside the buried pipe P is to prevent the cutting edge from reaching the outer peripheral surface of a polyethylene pipe (not shown) corresponding to the inner pipe. This is to prevent leakage from the polyethylene pipe. In this state, since the buried pipe P is formed, the inside of the buried pipe P communicates with the inside of the adapter case 11A.

The adapter case 11 is provided with an extraction pipe 14 made of an elbow capable of communicating with the inside of the case, and the extraction pipe 14 is provided with a pressure detection member 20 schematically shown in FIG.
The pressure detection member 20 is usually equipped with a detection marker 20A that has entered the case with a predetermined pressure by a biasing means such as a spring, and the detection marker 20A is caused by the pressure from the buried pipe P acting in the adapter case 11A. It is configured to be able to protrude against the urging force of the urging means.

  In the detection marker 20A, the leaked object leaking from the buried pipe P side, in this embodiment, the type of gas is displayed at the protruding position corresponding to the pressure obtained from the type of gas. The pressure of two types of gas, LNG and liquefied petroleum gas (LPG), can be identified.

Since the present embodiment is configured as described above, it is possible to select whether to attach / detach the stroke defining member 13 or not to use it according to the form of the drilling operation for the buried pipe P.
In particular, when the pressure inside the pipe is checked like a leakage inspection unlike the branch pipe installation work, the type of the buried pipe P to be inspected may not be known.
In this case, the facing relationship between the retaining ring 18 and the recess 13A targeted for the drilling operation is canceled, and the facing relationship of the stroke defining member 13 is changed to the relationship targeting the leakage inspection work. That is, the stroke defining member 13 is inverted in the axial direction so that the facing relationship with the end portion where the recessed portion 13A does not exist from the state in which the recessed portion 13A of the stroke defining member 13 faces the retaining ring 18 is obtained. Attach to.

After this operation, the rotary shaft 12 is rotated by the drive device in the same manner as in the normal drilling operation, and the punching cutter 16 is made to enter toward the buried pipe P side.
When the cutting edge of the punching cutter 16 protrudes about 1 mm into the buried pipe P, the retaining ring 18 abuts against the end of the stroke defining member 13, so that further entry is prevented. As a result, when an interior pipe such as a polyethylene pipe is present inside the buried pipe P, the cutting edge of the perforating cutter 16 does not inadvertently reach the peripheral surface of the interior pipe, thereby damaging the interior pipe. It is possible to prevent new leakage that may occur.

  On the other hand, the perforating cutter 16 projecting into the buried pipe P with a slight projecting amount of about 1 mm by the perforating operation can introduce gas into the adapter case 11A from the opening 16A formed at the cutting edge. The gas that has entered the adapter case 11A is determined by the pressure detection means 19 attached to the extraction pipe 14 to determine whether the pressure is at a specified value. That is, a leak determination can be made when any of the detection markers 20A in the pressure detection means 19 is supported.

  According to the present embodiment, the existing perforation apparatus can be used as it is in the apparatus for checking the pressure in the pipe as in the case of the leakage inspection apparatus, so there is no need to prepare a special apparatus for leakage inspection. The cost for the leakage work can be reduced.

  When the type of the buried pipe is known in advance, the stroke defining member 13 is perforated by setting the facing relationship between the end where the concave portion is located or the opposite end to the retaining ring 18 in advance. Of course, it is possible to perform a leak test at the same time.

It is a figure which shows the whole structure of the punching apparatus with a pressure confirmation function in a pipe | tube by the example for demonstrating embodiment of this invention. It is a figure for demonstrating the structure of the drilling adapter used for the drilling apparatus with a pressure confirmation function in a pipe | tube shown in FIG. It is a figure for demonstrating the structure and effect | action of a stroke prescription | regulation member used for the perforation adapter shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drilling apparatus with a pressure confirmation function in a pipe | tube 10 Saddle part 11 Drilling adapter 11A Adapter case 12 Rotating shaft 13 Stroke-defining member 13A Recessed part 14 Extraction pipe 16 Cutter for drilling 18 Retaining ring 20 Pressure detection member 20A Detection marker

Claims (3)

An apparatus used in a drilling process for confirming the pressure in a pipeline,
A saddle portion mounted on the outer peripheral surface of the pipe line and a saddle case provided integrally with the saddle portion and having a rotation shaft inserted therein, and the embedded pipe side in the axial direction of the rotation shaft A drilling adapter with a drilling cutter provided at the shaft end;
Between the end of the saddle case facing the opposite end and the retaining ring attached to the end opposite to the end on which the punching cutter is attached on the rotating shaft in the drilling adapter A stroke defining member that is detachably mounted on the rotary shaft;
A take-out pipe communicating with the inside of the saddle case through an opening formed on a side surface of the saddle case;
The stroke defining member is a length along the axial direction of the rotating shaft, and corresponds to a stroke that allows the tip of the perforating cutter to slightly protrude from the inner surface of the peripheral wall of the buried pipe to form a gas flow path. And is provided with a penetrating defining portion including a recessed portion for allowing the retaining ring to enter the position where the perforating cutter can penetrate the peripheral wall of the buried pipe at one end in the axial direction. Drilling with a pressure check function in a pipe, wherein the movement stroke of the punching cutter can be changed to a stroke penetrating the peripheral wall of the buried pipe and a stroke slightly protruding from the inner surface of the peripheral wall by switching the facing state apparatus.   The pressure detection member having a scale portion whose advance / retreat amount is set by the pressure of a leakage medium from the pipe is connected to the take-out pipe. Drilling device.   The buried pipe leakage inspection device according to claim 1 or 2, wherein a pipe intended for a gas flow path is used as the pipe line.

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