JP4349618B2 - Airtight device for pipeline and airtight method - Google Patents

Description

  The present invention relates to an airtight device for a pipe line and an airtight construction method, and more particularly to an airtight device and a construction method that are used to maintain airtightness in a test section during an airtight test of a PE pipe or the like.

The gas pipe, which is one of the existing pipes, can detect that a gas leak has occurred due to odorous components contained in the gas, while the laying pipe has a structure stipulated by laws and regulations. In order to perform a test for confirming the above, it is obliged to perform a pressure resistance test and an airtight test by sealing a test target section in a pipeline.
For example, the following method is used when performing an airtight test including a breakdown voltage.
This method is a method in which a test section is set at a predetermined interval in an existing buried pipe, the test section is pressurized with both ends of the test section sealed with sealing plugs, and a pressure change is monitored (for example, Patent Documents). 1).

The seal plug used for the leak test is composed of, for example, an end plate that is fixed in the axial direction of the screw rod and the other that can be moved by the rotation of the screw rod, and an elastic such as rubber loaded between the end plates. A configuration including a seal packing made of a body is known.
In this configuration, by rotating the screw rod, the seal packing is brought into close contact with the inner surface of the pipe line by utilizing the diameter expansion as the seal packing is crushed along the axial direction (for example, Patent Document 2).

JP 2001-116183 A (paragraph “0002” column) JP-A-11-241974 (paragraph "0010" column)

The configuration of the sealing plug disclosed in Patent Document 2 has the following problems.
When sealing both ends of the test section with sealing plugs, it is necessary to rotate the screw rod, so the work time until the seal packing adheres to the inner surface of the pipeline tends to be long. There is a possibility that workability may deteriorate.
Moreover, since there is no method other than confirming that the screw rod can no longer be turned to confirm that the tight contact with the inner surface of the pipe has been secured, even if the screw is crushed, In some cases, it may be misunderstood that it has been obtained, and there is a possibility that the tightness of the seal packing cannot be secured.

  In addition, since the seal packing is pushed and moved by the pressure applied to the inside of the pipe, the frictional load on the contact surface with the pipe inner surface increases, and as a result, if the dimensions change due to wear or the like, it is easy to come off. There is a risk of becoming.

  An object of the present invention is to improve workability and ensure a reliable airtight state by performing reliable sealing with simple operations in view of the problems in the above-described conventional airtight apparatus having a sealing plug and an airtight construction method using the same. An object of the present invention is to provide an airtight device for pipelines and an airtight construction method having a configuration that can be maintained.

The duct airtight device according to the first aspect of the invention, a conduit for air-tight apparatus used to carry out the seal test in sealing section sealing the ends of the conduit, said tube road Airtight device
A sealing disk, which is a member inserted into both ends of the conduit and has an outer diameter corresponding to the inner diameter of the conduit, and a grip portion is provided on one surface in the thickness direction;
A ring-shaped sealing member that is provided on the outer peripheral surface of the sealing disk and is in close contact with the inner surface of the pipe line by being bent and deformed, and hermetically seals the inside of the sealing section;
A cap formed of a ring member that is split in the circumferential direction of the pipe and can be opened and closed, and has a shape that can be fitted to the outer peripheral surface of the end of the pipe, and
The sealing member is formed on the outer peripheral surface of the sealing section in a state where the sealing disk is inserted into the pipe from the end of the pipe and is caused in a direction perpendicular to the laying direction of the pipe. A lip piece having a sloped surface that expands inward,
The cap composed of the ring member is
A latching device for latching the opening and closing side ends that can be opened and closed;
A fitting portion that is fitted and fixed to the outer peripheral surface of the pipe end portion;
A base for abutting the outer surface of the sealing disk inserted into both ends of the conduit;
Means for enabling adjustment of a contact pressure at which the fitting portion comes into contact with the outer peripheral surface of the pipe line when the ring member is mounted on the outer peripheral surface of the pipe end part;
It is characterized by that.

The invention according to claim 2 relates to the airtight device for pipe according to claim 1, wherein the fitting part provided in the cap is provided with a non-slip part that can bite into the outer peripheral surfaces of both ends of the pipe. It is characterized by having.

The invention according to claim 3 relates to the airtight device for pipe according to claim 1, wherein the means for adjusting the contact pressure is determined by the fastening amount of the fastening member provided at the opening / closing side end of the ring member. The open / close side ends are made to approach each other.

According to a fourth aspect of the present invention, there is provided the airtight device for a pipe line according to the first aspect, wherein the sealing disk includes a coupler for introducing a pressurized gas into the sealing section. It is said.

The airtight construction method of the pipeline according to the invention of claim 5 is an airtight construction method for sealing both ends of the pipeline and performing an airtight test in the sealed section,
A sealing member provided with a gripping portion on one surface in the thickness direction, formed with a lip piece that can be bent and deformed, can be in close contact with the inner surface of the conduit, and has a sloped surface that expands toward the inside of the sealing section. The sealing disk provided on the outer peripheral surface is inserted into the pipe line from the pipe end part of the sealing section in a tilted state.
After the sealing disk inserted in the conduit is raised in the radial direction of the conduit and the lip piece of the seal member is brought into close contact with the inner surface of the end of the conduit,
An end portion outer peripheral surface of both ends of the pipe line is configured by a ring member that is divided in the circumferential direction and can be opened and closed, and a fitting part that is fitted to the outer peripheral surface of the pipe end part, and the inside of the pipe line A cap having a base that abuts the outer surface of the sealing disk inserted into the sealing disk, and the base of the cap is abutted against the outer surface of the sealing disk. The contact pressure at which the fitting portion of the cap sandwiches the outer peripheral surface is adjusted by the fastening amount of the fastening member provided at the opening / closing side end,
Subsequently, a pressurized gas is introduced into the sealing section through a coupler provided on the sealing disk.

According to the present invention, the lip piece of the seal member is moved to the inner surface of the pipe line by performing an operation of inserting the sealing disk into the pipe line in a tilted state and then raising it in a direction perpendicular to the laying direction of the pipe line. The inside of the sealing section can be closed in a state of being in close contact with. Furthermore, the end of the pipe line in which a cap composed of a ring member that is divided in the circumferential direction of the pipe line and can be opened and closed and fitted to the outer peripheral surface of the end part of the pipe line is sealed with a sealing disk It is attached to the outer peripheral surface of the part and supported in a state in which the outer surface of the sealing disk is abutted by the base part of the ring member, and the fitting part of the ring member is provided at the end of the pipe line. It is configured to be fitted and fixed to the outer peripheral surface.
As a result, when the pressurized gas is introduced into the sealing section, the lip piece of the sealing member is brought into close contact with the inner surface of the pipe line by the pressure of the pressurized gas, thereby improving the sealing performance in the sealing section. Because the fitting part of the ring member is fitted to the outer peripheral surface of the pipe end, the sealing disk does not come out of the pipe carelessly due to the pressure of the pressurized gas, simplifying the work It is possible to provide an airtight device for a pipe line used for conducting an airtight test in a sealed section of a pipe line, and an airtight method using the airtight apparatus for a pipe line.

The ring member constituting the cap is configured to be openable and closable, the contact pressure when the pipe outer peripheral surface is sandwiched by the fastening amount of the fastening member can be adjusted, and the fitting portion of the ring member is the pipe By providing anti-slip portions that can bite into the outer peripheral surfaces of both ends of the road, it becomes possible to reliably prevent the sealing disk from coming off. Further, even when a pipe line having a slight difference in diameter is targeted, the ring member can sandwich the outer peripheral surface of the pipe line.

  Hereinafter, the best mode of the present invention will be described with reference to embodiments shown in the drawings.

FIG. 1 is a view showing a state in which a pipeline airtight device 100 according to the present embodiment is incorporated in the end of a pipeline. In FIG. 1, the pipeline airtight device 100 is loaded in the end of the pipeline P. A sealing disk 101 and a cap 102 are provided.
The sealing disk 101 is a lid plug member for hermetically holding the inside of the airtight test section, and shows an external state corresponding to the inner diameter of the pipe P as shown in FIG. It has a diameter and is configured by a hollow cylindrical member in which a grip portion 101A as an operation portion is integrated on one surface in a thickness direction parallel to the laying direction.
In FIG. 1, reference numeral 111 denotes a coupler. The coupler 111 is a coupler having a configuration that allows the inside of the airtight test section to communicate with the outside. The usage mode will be described later. Are connected to each other so that the pressurized gas can be introduced into the test section and is cut off from the outside.

  On the outer peripheral surface of the sealing disk 101, a recess 101C is formed by one surface on which the grip portion 101A is provided in the thickness direction and a fixing plate 101B fastened at a position facing the one surface. Inside the 101C, a seal member 103 protruding outward from the outer peripheral surface of the sealing disk 101 is disposed.

The sealing member 103 is a ring-shaped member using an elastic body such as rubber that is larger in diameter than the sealing disk 101 and can be bent and deformed, and both ends in the thickness direction are on one side of the sealing disk 101. It is sandwiched and fixed by the fixing plate 101B.
The seal member 103 can be deformed into a swaying state when the peripheral surface projecting outward from the outer peripheral surface of the sealing disk 101 is moved while being rubbed with the inner surface of the tube. It can come into close contact with the inner surface of the tube by a restoring force.

The outer peripheral surface of the seal member 103 is provided with a plurality of lip pieces along the thickness direction so that the lip pieces can be swung from the inner surface of the test section so that the outer peripheral surface of the seal member 103 can be slid and moved when being moved. It is configured to be able to get up toward the outside when subjected to pressure.
That is, as a form in this case, it is set in a state where it has fallen in advance toward the inside of the test section, and is caused from the state of being tilted by receiving pressure from the inside of the test section, and its tip is the inner surface of the pipe P. It refers to the form that can be closely attached to.
In this embodiment, as the shape of the outer peripheral surface of the seal member 103, as shown in FIGS. 3 and 4, the gradient surface is in a state of falling toward the inside of the test section and further expanding in diameter toward the inside of the test section. Each of the inner and outer peripheral surfaces has a shape.

On the other hand, in FIG. 1, a cap 102 is attached to the end of the conduit so as to cover the outside of the sealing disk 101 inserted into the tube.
The cap 102 has an inner diameter that can be fitted to the outer peripheral surface of the end of the pipe P, and is configured by an openable and closable ring-shaped member that is divided in the circumferential direction of the pipe P as shown in FIG.

The ring-shaped member constituting the cap 102 has a structure in which one of the divided portions is hinged, the other of the divided portions is an open / close side, and the open / close sides are connected by being latched by a locking device 104. Has been.
In other words, the locking bracket 105 is fixed to one of the open / close side end portions, and the engagement bracket 106 is fixed to the other of the open / close side end portions opposed thereto. The locking operation member 107 provided so as to be able to swing is provided to constitute the locking device 104.

The locking operation member 107, which is a constituent member of the locking device 104, uses a screw rod, and is provided with a locking pin 107B in the axial direction.
The locking pin 107B is a member that can be fitted into a locking recess 105A formed on the locking bracket 105 side, and the locking operation member 107 is on the locking bracket 105 side with the engagement bracket 106 side as a fulcrum. The opening / closing side ends of the ring-shaped member constituting the cap 102 can be hooked with each other by being fitted into the locking recess 105A when swung toward the front.

The locking operation member 107 can be pushed and moved in a state where the support pin 107A is fitted in the locking recess 105A on the locking bracket 105 side according to the fastening of the nut 108. Thereby, the locking bracket 105 can be moved closer to the engagement bracket 106 side, and the clamping pressure of the ring-shaped members into the pipe P can be adjusted.
Since the locking operation member 107 can adjust the clamping pressure between the open / close side ends of the ring-shaped member, for example, even when the pipe P having a slightly different outer diameter is used as a target, the different outside Even without preparing a cap having a pinching diameter for a pipe having a diameter, the outer peripheral surface of the pipe P can be pinched by adjusting the facing distance between the locking bracket 105 and the engaging bracket 106 corresponding to the pinching pressure. it can.

As shown in FIG. 1, the inner surface of the cap 102 is integrally formed with a disc-shaped base portion 102A and a fitting portion 102B projecting from the outer peripheral portion of the base portion 102A toward the laying direction of the outer peripheral surface of the pipe P. The base portion 102A is used as a portion where the sealing disk 101 abuts, and the fitting portion 102B is provided with an anti-slip portion 102C with respect to the outer peripheral surface of the pipe P on the inner surface.
The anti-slip portion 102C provided on the inner surface of the fitting portion 102B has a sharp tooth shape protruding from the inner wall surface, and this tooth shape portion is provided over almost the entire fitting portion.
The anti-slip portion 102 </ b> C can prevent displacement in the laying direction of the pipeline P by biting into the outer circumferential surface of the pipeline P by the clamping pressure when the cap 102 sandwiches the outer circumferential surface of the pipeline P.

Since the present embodiment is configured as described above, the following procedure is used when maintaining airtightness in the test section of the pipe P.
(1) The sealing disk 101 is inserted into the pipe line P in a state where the disk 101 is tilted substantially parallel to the laying direction of the pipe line P.
(2) The sealing disk 101 inserted into the pipe P is raised in a direction perpendicular to the laying direction of the pipe P.
(3) With the cap 102 placed on the end of the pipe line P, the opening and closing side ends of the ring-shaped member constituting the cap 102 are latched by a locking device 104 having a locking operation member 107. Then, the nut 108 provided in the locking operation member 107 is fastened to sandwich the pipe P.
In the procedure as described above, after the sealing disk 101 is inserted into the pipeline P in a tilted state, the pipeline P can be closed only by the work to be caused.
When the sealing disk 101 is raised, the seal member 103 moves along the laying direction of the pipe P while swinging according to the size of its outer diameter. As a result, the seal member 103 can be brought into close contact with the inner surface of the pipe P by the shape restoring force generated when it is compressed and deformed.

On the other hand, the cap 102 has the support pin 107B of the locking operation member 107 supported by the engagement bracket 106 positioned at the opening / closing side end of the ring-shaped member fitted in the locking recess 105A of the locking bracket 105. By tightening the nut 108 and pushing the brackets 105 and 106 closer together, the pipe P can be sandwiched. At this time, the non-slip portion 102B of the cap 102 bites into the outer peripheral surface of the pipe P, so that the sealing disk 101 is not accidentally pulled out from the pipe P.

  In this way, the sealing disk 101 is loaded inside the conduit P, and the cap 102 is mounted on the outer peripheral surface of the conduit P. The sealing disk 101 faces the base of the cap 102. As a result, the sealing disk 101 is maintained in a state perpendicular to the laying direction of the pipeline P, and the test section of the pipeline P can be closed.

  When the inside of the test section of the pipe P is pressurized, the pressure acts on the sealing disk 101. For this reason, the sealing disk 101 tends to be moved toward the outside of both ends of the test section of the pipe P, but this movement has a non-slip portion 102B that bites into the outer peripheral surface of the pipe P. It will be blocked by the base 102A of the cap 102.

In this embodiment, when the pressurized gas is introduced into the hermetic test section closed by the sealing disk 101, the socket can be connected to the coupler 111 provided in the sealing disk 101. A wrench 110 is used.
As shown in FIG. 1, the socket wrench 110 includes a relay coupler 110A that can be connected to a coupler 111 provided in the sealing disk 101. The relay coupler 110A is only in a direction in which gas can be introduced. Built-in check valve mechanism to be opened.
Therefore, when performing the airtight test after the sealing disk 101 and the cap 102 are mounted on the conduit end, the socket wrench 110 connects the relay coupler 110A to the coupler 111 on the sealing disk 101 side. In this state, the introduction of gas and the shutoff of the coupler 111 on the sealing disk 101 side are maintained.

  According to the present embodiment, the ring-shaped member constituting the cap 102 is divided, and the open / close side ends thereof are tightened according to the tightening amount, so that pipes having a slight difference in diameter are targeted. Even in this case, since the outer peripheral surface of the pipe line can be sandwiched, it is not necessary to prepare components for airtightness for each caliber, and an excellent effect can be exhibited in component management costs.

  By the way, in a present Example, although the pressure holding state in an airtight test area is maintained based on the structure mentioned above, after completion | finish of an airtight test, the member with which the pipe line terminal part is mounted | worn will be removed. At this time, since it is necessary to loosen the nut 108 provided in the locking operation member 107 of the cap 102, the socket wrench 110 having the relay coupler 110 </ b> A connected to the coupler 111 on the sealing disk 101 side is connected between the couplers. The connection is released and removed. As a result, the coupler 111 on the sealing disk 101 side can communicate with the outside and the inside of the test section, so that the pressurized gas in the test section is eliminated and the pressure in the test section becomes atmospheric pressure.

  When the pressure in the test section changes to atmospheric pressure, even when the cap 102 is removed, the sealing disk 101 does not suddenly jump out due to the residual pressure in the test section, and can be safely removed.

It is a figure which shows the mounting state to the pipe line of the airtight apparatus for pipe lines by the Example of this invention. It is a figure which shows the structure of the sealing disk used for the airtight apparatus for pipe lines shown in FIG. It is a figure which shows the structure of the sealing member used for the disc for sealing shown in FIG. It is a figure which shows another structure of the sealing member shown in FIG. It is a figure which shows the structure of the cap used for the airtight apparatus for pipe lines shown in FIG. 1, (A) has shown the open state, (B) has each shown the closed state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Airtight apparatus for pipe lines 101 Sealing disk 101A Gripping part 102 Cap 103 Seal member 104 Locking apparatus 105 Locking bracket 105A Locking recess 106 Engagement bracket 107 Locking operation member 108 Nut P Pipeline P1 Communication hole

Claims (5)

An airtight device for a pipe used to seal both ends of a pipe and perform an airtight test in a sealed section , wherein the airtight device for the pipe is
A sealing disk, which is a member inserted into both ends of the conduit and has an outer diameter corresponding to the inner diameter of the conduit, and a grip portion is provided on one surface in the thickness direction;
A ring-shaped sealing member that is provided on the outer peripheral surface of the sealing disk and is tightly adhered to the inner surface of the pipe line by being bent and deformed to hermetically seal the inside of the sealing section;
A cap formed of a ring member that is split in the circumferential direction of the pipe and can be opened and closed, and has a shape that can be fitted to the outer peripheral surface of the end of the pipe, and
In the state where the sealing disk is inserted into the pipe line from the end of the pipe line and is caused in a direction perpendicular to the laying direction of the pipe line, the sealing member is disposed on the outer peripheral surface of the sealing section. A lip piece having a sloped surface that expands inward,
The cap composed of the ring member is
A latching device for latching the opening and closing side ends that can be opened and closed;
A fitting portion that is fitted and fixed to the outer peripheral surface of the pipe end portion;
A base for abutting the outer surface of the sealing disk inserted into both ends of the conduit;
Means for adjusting the contact pressure at which the fitting portion contacts the outer peripheral surface of the pipe when the ring member is mounted on the outer peripheral surface of the pipe end.
An airtight device for ducts. The airtight device for a pipe line according to claim 1, wherein the fitting part provided in the cap is provided with a non-slip part capable of biting into outer peripheral surfaces of both ends of the pipe line. The means for adjusting the contact pressure is configured to bring the opening and closing side ends closer to each other by a fastening amount of a fastening member provided at the opening and closing side end of the ring member. Item 2. An airtight device for pipelines according to item 1. The pipe sealing device according to claim 1, wherein the sealing disk includes a coupler for introducing a pressurized gas into the sealing section. It is an airtight construction method for sealing both ends of a pipeline and conducting an airtight test in a sealed section,
A sealing member provided with a gripping portion on one surface in the thickness direction, formed with a lip piece that can be bent and deformed, can be in close contact with the inner surface of the conduit, and has a sloped surface that expands toward the inside of the sealing section. The sealing disk provided on the outer peripheral surface is inserted into the pipe line from the pipe end part of the sealing section in a tilted state.
After the sealing disk inserted in the conduit is raised in the radial direction of the conduit and the lip piece of the seal member is brought into close contact with the inner surface of the end of the conduit,
An end portion outer peripheral surface of both ends of the pipe line is configured by a ring member that is divided in the circumferential direction and can be opened and closed, and a fitting part that is fitted to the outer peripheral surface of the pipe end part, and the inside of the pipe line A cap having a base that abuts the outer surface of the sealing disk inserted into the sealing disk, and the base of the cap is abutted against the outer surface of the sealing disk. The contact pressure at which the fitting portion of the cap sandwiches the outer peripheral surface is adjusted by the fastening amount of the fastening member provided at the opening / closing side end,
Subsequently, a pressurized gas is introduced into the sealing section through a coupler provided on the sealing disk.

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