JP4080906B2 - Pipe branch section blocking jig and no-blow work method using this jig - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe branching section blocking jig and a no-blow work method using the jig.
[0002]
[Prior art]
Conventionally, the branch pipe take-out method is to pierce the branch source pipe in the active pipe state and attach the branch joint. However, in consideration of safety, a no-blow work bag as shown in FIG. The no-blow work (no jetting work) used is the basis.
[0003]
First, the base C of the drilling machine is attached to the branch source pipe A in the live pipe state by the chain B, and the branch hole A1 is formed in the branch source pipe A by attaching the drilling machine E to the opening C1 of the base C. Perforate. Next, a branch joint G having a branch hole sealed with a stopper F in advance is provided inside the no-blow work bag D, and the no-blow work bag D is attached to the opening C1 of the base C to cover the punching machine E. And the punching machine E is removed in this no blow work bag D, and the branch joint G is attached to the branch hole A1. Thereafter, the no-blow work bag D is removed, and the pedestal C is removed via the branch joint G, and a branch pipe is connected to the branch joint G. When the connection of the branch pipe is completed, the no-blow work bag D is mounted again on the upper part G1 of the branch joint, and the stopper F is removed from the upper opening G1 of the branch joint G in the no-blow work bag, and the upper opening G1 is plugged ( (Not shown). Finally, the no-blow work bag D is removed from the upper part of the branch joint G to complete the work.
[0004]
In such a branch pipe taking-out method, it is necessary to attach the branch joint G to the branch hole A1 in the no-blow work bag D, or it is necessary to remove the base C through the branch joint G after the branch joint G is attached. Therefore, it is assumed that the base G2 handles a short branch joint. However, in the branch pipe taking-out method currently performed, a branch joint with a transition in which a relay PE pipe having a certain length is fixed to the base of the branch joint in advance is often used. Therefore, the conventional no-blow work method as described above cannot be adopted.
[0005]
Not only this method of taking out the branch pipe, but also a method of removing the installed branch pipe together with the branch joint and plugging the branch hole of the branch source pipe, and exchanging the clamp for the branch point using the clamp Even in the construction method for performing work, there are cases in which the no-blow work bag is forced to be temporarily removed from the periphery of the branch hole formed in the pipe line in the live pipe state.
[0006]
In order to cope with this, the present applicants have proposed a blocking jig described in Patent Documents 1 and 2 below. These blocking jigs are inserted into the branch hole of the branch source pipe along the branch connection axis (axis perpendicular to the branch source pipe), and block the branch hole from the inside of the branch source pipe. .
[0007]
Specifically, the one described in Patent Document 1 includes an expanding body that expands by supplying gas from the outside of the tube, and after expanding the diameter by supplying gas to the expanding body in the branch source pipe, the expansion is performed. The body is pressed from the inside of the tube to the branch hole. In addition, the one described in Patent Document 2 is that a spherical elastic hollow body that is normally spread in a direction perpendicular to the branch connection axis is stretched and deformed and inserted into the branch hole of the branch source pipe. After being inserted into the tube, it is restored to its original shape and is pressed into the branch hole from the inside of the tube.
[0008]
By using such a blocking jig, the no-blow work bag can be temporarily removed from the periphery of the branch hole while the branch hole is blocked. It becomes possible to carry out the construction method that must be removed once by no-blow work.
[0009]
[Patent Document 1]
JP 2000-18465 A
[Patent Document 2]
No. 7-4393
[0010]
[Problems to be solved by the invention]
When such a blocking jig is used, first, a branch joint is temporarily attached to the branch hole blocked by the jig, and the blocking jig is drawn into the branch joint while reducing the diameter, thereby sealing the inside of the branch joint. After it is stopped, the branch joint is completely attached to the branch hole of the branch source pipe (this is installed), so that the branch joint can be connected to the branch hole of the branch source pipe without being affected by the blocking jig. It becomes possible to install. In general, an airtight test is performed on the downstream side of the branch joint while the inside of the branch joint is shut off.
[0011]
In order to cope with such work, the blocking jig has good blocking performance in each of the first stage that blocks the branch hole of the branch source pipe and the second stage that blocks the branch hole in the branch joint. It is necessary to demonstrate. However, according to the above-described conventional shut-off jig, there is a problem that it is not compatible with such work.
[0012]
That is, in the one described in Patent Document 1, it is possible to obtain the above-described two-stage cutoff performance by controlling the supply pressure of the gas supplied to the expansion body, but in order to control the gas supply pressure Requires an attached facility, which complicates the work and increases the construction cost. Moreover, in the thing of patent document 2, although it is possible to perform the 2nd step | paragraph interruption | blocking mentioned above using the intermediate | middle restored state of an elastic hollow body, it does not stick an elastic hollow body firmly in a branch joint. Therefore, there is a problem that sufficient airtightness cannot be obtained.
[0013]
The present invention has been proposed in order to cope with such a situation, and even in a construction method in which a no-blow work bag is forced to be temporarily removed from around a branch hole as in the case of using a branch joint with a transition. The existing equipment can be used as it is, and no-blow work can be performed throughout. In this work, the first stage of blocking the branch hole of the branch source pipe and the inside of the branch joint attached to the branch hole An object of the present invention is to provide a pipe branching part blocking jig capable of obtaining sufficient blocking performance in a plurality of stages as in the second stage of blocking.
[0014]
[Means for Solving the Problems]
In order to achieve such an object, the present invention has the features according to the following claims.
[0015]
Book The invention has an outer diameter that passes through a branch hole of the pipe branching portion with respect to the pipe branching portion to which the branch pipe is connected to the branching source pipe. A pipe branching section blocking jig for blocking, a pair of pressure pieces that can be moved close to and away from each other by an operation from outside the pipe, and compressed and deformed by the close operation of the pressure pieces, thereby sealing the branch hole An elastic sealing member, and the elastic sealing member includes: A hollow part is formed inside and having a cylindrical or barrel-shaped outer shape, and the side wall thickness minimum part formed by the hollow part is formed above the upper and lower center, The outer diameter increases according to the state of the compression deformation, and a sealing surface capable of being in close contact with the inner surface of the branch source pipe is formed.
[0016]
Book The invention has an outer diameter that passes through a branch hole of the pipe branching portion with respect to the pipe branching portion to which the branch pipe is connected to the branching source pipe, and the pipe branching portion is inserted into the branching hole. A pipe branching section blocking jig for blocking, wherein a base shaft member, a cylindrical member that slides up and down along the base shaft member, one side is provided on the side of the cylindrical member and the base shaft member side A pair of pressure pieces that can be moved closer to and away from each other by sliding the cylindrical member with respect to the base member, and an elastic sealing member that is disposed between the pressure pieces and penetrates the base member. An in-pipe abutting member connected to the lower end of the base shaft member and abutted against the inner surface of the branching source pipe, the elastic sealing member is A hollow part is formed inside and having a cylindrical or barrel-shaped outer shape, and the side wall thickness minimum part formed by the hollow part is formed above the upper and lower center, By sliding and operating the cylindrical member downward along the base shaft member, the cylindrical member is compressed and deformed in the branch source pipe, and the outer diameter is increased according to the state of the compression deformation, and the branch source pipe The sealing surface which can be closely_contact | adhered to the inner surface of is formed.
[0017]
Book The present invention presupposes the aforementioned pipe branching section blocking jig, engaging means for engaging the cylindrical member and the base shaft member in a state where the sealing surface is formed, and releasing the engagement. An operation unit having engagement disengaging means for adjusting and adjusting / fixing means for adjusting or fixing the compression deformation state.
[0018]
Book The invention is characterized in that the pipe contact member includes an elastic repulsion member that urges the sealing surface upward, on the premise of the aforementioned pipe branching section blocking jig.
[0019]
Book The invention is characterized in that the pipe contact member has an attachment part that can be replaced or adjusted in accordance with the diameter of the branch source pipe, on the premise of the pipe branching section blocking jig described above.
[0021]
Book The invention Having the characteristics described above A no-blow work method using a pipe branching part blocking jig, the step of covering the periphery of the pipe branch part with a no-blow work bag in which the jig is disposed, and the treatment in the no-blow work bag A tool is inserted into the branch hole, and the elastic sealing member of the jig is compressed and deformed in the branch source pipe by an operation in the no-blow work bag, and the sealing surface formed by the compression deformation is A branch part blocking step for sealing the branch hole by being brought into close contact with the inner surface of the branch source pipe line, and a step of removing the no-blow work bag after the branch portion blocking step.
[0022]
Book The present invention presupposes the above-mentioned no-blow work method, after the step of removing the no-blow work bag, the step of temporarily attaching a branch joint to the branch hole, and adjusting the compression deformation state of the elastic sealing member After sealing the branch hole in the branch joint, the step of permanently mounting the branch joint, and the step of mounting a no-blow work bag on the upper opening of the branch joint and removing the jig in the no-blow work bag It is characterized by having.
[0023]
Book The present invention presupposes the above-described no-blow work method, the no-blow work bag has a jig projecting hole, and the jig projecting hole is provided with or removed from the jig projecting hole when the jig is disposed or removed from the no-blow work bag. The upper part protrudes.
[0024]
The invention according to each claim having such characteristics has the following effects.
[0025]
1stly, according to the above-mentioned pipe branch part interception jig and the no-blow work method using this jig, it becomes possible to insert into the branch hole of the pipe branch part and seal it from the inside. After sealing, the sealed state can be maintained even if all the equipment including the no-blow work bag is removed from the periphery of the branch hole. As a result, conventionally, it is possible to perform a construction method such as taking out a branch pipe by a branch joint with a transition, in which a no-blow work bag has to be once removed, by a no-blow work from start to finish.
[0026]
Secondly, the elastic sealing member of the pipe branching section blocking jig has a structure in which the diameter is increased by compressive deformation, and the outer diameter increases according to the state of the compressive deformation, and on the inner surface of the branch source pipe Since the sealing surface that can be brought into close contact is formed, when sealing the branch hole drilled in the branch source pipe, the sealing surface is formed by compressive deformation in the first stage. When shutting off and then installing the branch joint and sealing the branch hole in the branch joint, the compression deformation state can be adjusted to change the outer diameter expansion state and the second stage shut off can be performed it can. At this time, in the first-stage blocking, the formed sealing surface is brought into close contact with the branch hole, so that reliable sealing is possible, and in the second-stage blocking, elastic sealing is performed in the branch joint. By pulling in the member and changing the compression state, the outer diameter of the elastic branch member expanded according to the compression state can be tightly adhered to the inner surface of the branch hole in the branch joint, so in this case also reliable sealing Is possible. Therefore, sufficient shut-off performance can be obtained even in multi-stage shut-off.
[0027]
Third, the operation for compressing and deforming the elastic sealing member is a linear operation for bringing the pressurizing piece closer, and a simple operation for sliding the cylindrical member downward with respect to the base member. Therefore, it can respond without a problem by one-handed operation in the no-blow work bag.
[0028]
Fourth, the operating portion engages the tubular member and the base shaft member with the sealing surface formed, an engagement releasing means for releasing the engagement, and an elastic sealing member Adjustment / fixing means for adjusting or fixing the state of compressive deformation of the tube, so that, during an operation performed in a no-blow working bag, the cylindrical member is simply slid with respect to the base shaft member and engaged by the engagement means. The sealing surface can be formed on the elastic sealing member by operation, and the adjustment of the compression state when sealing the inside of the branch joint can be performed by the adjusting / fixing means after removing the no-blow work bag.
[0029]
Fifth, the in-pipe contact member includes an elastic repulsion member that urges the sealing surface formed on the elastic sealing member upward, and can be exchanged or adjusted according to the diameter of the branch source pipe Since it has an attachment part, when sealing the branch hole of the branch source pipe, the sealing surface of the elastic sealing member is brought into close contact with the inner surface of the pipe by the urging force of the elastic repulsion member, enabling reliable sealing In addition, even when the diameter of the branch source pipe changes, a constant urging force can be applied by exchanging or adjusting the attachment portion.
[0030]
Sixth, the elastic sealing member has a cylindrical or barrel-shaped outer shape and has a hollow portion formed therein, and a side wall thickness minimum portion formed by the hollow portion is formed above the vertical center. Therefore, according to the compression deformation, the outer diameter is gradually expanded by refracting the side wall thickness minimum part and gradually protruding the side, and in the final compression deformation state, the outer shape is an inverted cone. It becomes a trapezoid and an upward sealing surface is formed.
[0031]
Seventhly, in the no-blow work method using the above-mentioned pipe branching section blocking jig, the no-blow work is performed after sealing the branch hole of the branch source pipe with the sealing surface formed in the elastic sealing member. Remove the bag, temporarily attach the branch joint to the branch hole from the top of this jig, release the engagement between the cylindrical member and the base shaft member by the operation part, pull the elastic sealing member into the branch joint, and The elastic sealing member is partially enlarged and fixed by adjusting the adjusting / fixing means, and the inside of the branch joint is sealed. According to this, the branch joint is connected to the branch hole and the branch pipe is connected to the branch joint. After the construction is completed, the inside of the branch joint is sealed with this jig and connected to the downstream side of the branch joint. It is possible to perform an airtight test on the branch pipe. In addition, since the elastic coupling is pulled into the branch joint after the airtightness test, the branch joint is fully installed, so that the branch joint can be securely attached to the branch hole of the branch source pipe line without being affected by the presence of the jig. Can be attached to.
[0032]
Eighth, the no-blow work bag has a jig projecting hole, and when the jig is placed in or removed from the no-blow work bag, the upper part of the jig projects from the jig projecting hole, so that the jig is long. Even if it becomes, by making it protrude in a jig | tool protrusion hole, it is not necessary to enlarge a no-blow work bag, and can respond with the existing equipment.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing a configuration of a pipe branching section blocking jig according to an embodiment of the present invention. In the figure, A indicates a branch source pipe, A1 indicates a branch hole drilled in the branch source pipe, and G indicated by a broken line indicates a branch joint connected to the branch hole. Here, the branch source pipe A is in an active pipe state (a state in which a fluid flows in the pipe).
[0034]
The structure of the pipe branching section blocking jig 1 (hereinafter referred to as jig 1) inserted into the branch source pipe A from the branch hole A1 along the branch connection axis O forms the central axis of the jig 1. The base shaft member 2, the cylindrical member 3 slidably mounted along the base shaft member 2, the elastic sealing member 4 that expands by compression and seals the branch hole A 1, and the inner surface in the branch source pipe And a spring member 6 that is an elastic repulsion member that presses the elastic sealing member 4 against the branch hole A1 by a repulsive force from the inner surface of the tube.
[0035]
A screw portion 2a is formed in the vicinity of the upper end of the base shaft member 2, and an adjusting / fixing nut (adjustment / fixing means) 10A is screwed into the screw portion 2a, and slides along the base shaft member 2 below the screw portion 2a. A cylindrical sliding operation member 10B is provided, and an operation portion 10 is formed by the adjusting / fixing nut 10A and the sliding operation member 10B. The sliding operation member 10B is provided with an engagement release button (engagement release means) 10b having an engagement protrusion (engagement means) 10a to be engaged with the engagement portion 2b of the base shaft member 2. .
[0036]
The cylindrical member 3 is slid along the base shaft member 2 by a sliding operation of the sliding operation member 10B, and an upper pressure piece 11 is provided at the lower end of the cylindrical member 3 side. A pair of lower pressure pieces 12 fixed to the base shaft member 2 side by screws or the like are installed opposite to the upper pressure pieces 11, and are moved closer to and away from each other by sliding the cylindrical member 3 with respect to the base shaft member 2. A pressure piece is formed. The elastic sealing member 4 is disposed between the upper pressure piece 11 and the lower pressure piece 12 through the base shaft member 2. 3A is a reference line marked on the outer surface of the cylindrical member 3.
[0037]
The in-pipe contact member 5 includes a mounting portion 5A that is slidably mounted on the lower end of the base shaft member 2, and an attachment portion 5B that is detachably mounted on the lower end of the mounting portion 5A. The lower end of the attachment portion 5B Is provided with an adjusting screw portion 5C. A spring member 6 is disposed between the upper end of the in-pipe abutting member 5 (mounting portion 5 </ b> A) and the lower pressurizing piece 12, and the lower pressurizing piece 12 is attached to the in-pipe abutting member 5. It is energizing upward.
[0038]
The jig 1 having such a structure has the entire outer diameter (each of the members 2 to 5 and the pressure pieces 11 and 12) set smaller than the inner diameter of the branch hole in the branch joint G. The jig 1 can be inserted from the upper opening G1 into the branch source pipe A through the branch hole A1, and the branch joint G is attached to the branch hole A1 from above the jig 1 with the jig 1 inserted into the branch hole A1. I can do it.
[0039]
FIG. 2 shows a state where the elastic sealing member 4 in the jig 1 is compressed and deformed (the same reference numerals are given to the same portions as those in FIG. 1). To make this state, the jig 1 is inserted into the branch source pipe A through the branch hole A1, and the sliding operation is performed with the in-pipe contact member 5 being in contact with the inner surface of the branch source pipe A. The member 10B is slid downward along the base shaft member 2, and the engaging portion 2b of the base shaft member 2 and the engaging protrusion 10a of the sliding operation member 10B are engaged. This operation is a simple operation in which the sliding operation member 10B is gripped outside the pipe and pushed downward, and can be easily performed even with one-hand operation in the no-blow work bag. Here, the in-pipe abutting member 5 is configured so that the attachment portion 5B can be exchanged with a different size, and the adjusting screw portion 5C is appropriately protruded so that the branch source pipe having a different diameter with a single jig 1 is provided. A is available.
[0040]
The elastic sealing member 4 is compressed by the proximity of the upper pressure piece 11 provided at the lower end of the cylindrical member 3 and the lower pressure piece 12 fixed to the base shaft member 2 by an operation from outside the tube. In response to this, it is compressed and deformed in the branch source pipe A as shown in the figure. The elastic sealing member 4 is deformed into an inverted frustoconical shape according to a characteristic form described later, and an upward sealing surface 4A is formed.
[0041]
The elastic sealing member 4 formed with the sealing surface 4A is a spring member provided between the upper end of the in-pipe contact member 5 that is in contact with the inner surface of the branch source pipe A and the lower pressure piece 12. The sealing surface 4A urged upward by 6 and formed by compressive deformation is urged and brought into close contact with the inner surface of the pipe around the branch hole A1 by the repulsive force of the spring member 6. Here, the repulsive force of the spring member 6, the position of the elastic sealing member 4 (upper pressure piece 11 and lower pressure piece 12), and the length of the in-pipe contact member 5 are the same as those of the branch source pipe A. It is set to an optimum value according to the aperture, so that a constant urging force can be obtained.
[0042]
Further, in this compression deformation state, the adjusting / fixing nut 10A is rotated and lowered in the direction of the arrow (downward), and the upper surface of the sliding operation member 10B is pressed by the bottom surface of the adjusting / fixing nut 10A. Thus, the compression deformation state can be fixed. Thereby, even when the engagement release button 10b is operated by mistake, the compression deformation state of the elastic sealing member 4 is maintained, and safety can be ensured.
[0043]
3-5 is explanatory drawing explaining the form and function of the elastic sealing member in the jig for pipe | tube branch part interruption | blocking which concern on embodiment (each figure (a) is each state of the elastic sealing member 4) Each figure (b) has shown the external perspective view.In the same place as the above-mentioned explanation, the same numerals are attached and the duplicate explanation is omitted a part.). The elastic sealing member 4 is made of a rubber (EPDM) or other elastic material that has good resilience and is easily deformed. When not compressed, the elastic sealing member 4 has a cylindrical or barrel-shaped outer shape as shown in FIG. A hollow portion 40 is formed in the bottom. The hollow portion 40 is formed in a curved surface shape, whereby the side wall thickness of the elastic sealing member 4 is thinner near the center than near the upper and lower ends. The lateral minimum thickness portion 41 is formed so as to be on the upper side by a predetermined dimension h with respect to the upper and lower central portions 42. Further, an air vent hole 43 communicating with the hollow portion 40 is formed in the lower side portion of the elastic sealing member 4, and through holes 44 </ b> A and 44 </ b> B through which the base shaft member 2 is penetrated are formed in the vertical center portion.
[0044]
When the elastic sealing member 4 having such a configuration is compressed and deformed by the proximity of the upper pressure piece 11 and the lower pressure piece 12, the elastic sealing member 4 is refracted by the side wall thickness minimum portion 41. Then, as shown in FIG. 4, the upper pressure piece 11 and the lower additional piece are further compressed in the direction indicated by the arrow until the engaging portion 2b of the base shaft member 2 and the engaging protrusion 10a of the sliding operation member 10B are engaged. When the pressure piece 12 comes close, the side wall thickness minimum portion 41 is positioned above the upper and lower central portion 42, and therefore the side portion above the side wall thickness minimum portion 41 is refracted almost horizontally. Thus, the upward sealing surface 4A is formed, and the external appearance shape of the entire elastic sealing member 4 becomes an inverted truncated cone shape. In this way, the elastic sealing member 4 can form a flat sealing surface 4A, which can be brought into close contact with the inner surface of the pipe around the branch hole A1, so that a wide sealing portion is formed around the branch hole A1. And high sealing performance can be obtained.
[0045]
Then, in the compression deformation state shown in FIG. 4, the engagement release button 10b is operated to release the engagement between the engagement portion 2b of the base shaft member 2 and the engagement protrusion 10a of the sliding operation member 10B, and adjust When the fixing nut 10A is rotated to gradually separate the space between the upper pressure piece 11 and the lower pressure piece 12, the side wall thickness minimum portion 41 is refracted as shown in FIG. Can be adjusted according to the distance between the upper pressure piece 11 and the lower pressure piece 12. That is, the elastic sealing member 4 can adjust the amount of expansion of the outer diameter according to the state of compressive deformation.
[0046]
Further, in order to assist such characteristic compressive deformation of the elastic sealing member 4, the upper pressure piece 11 and the lower pressure piece 12 are provided with convex portions 11 </ b> A and 12 </ b> A facing each other. The convex portions 11A and 12A have a diameter smaller than the outer diameter of the upper and lower surfaces of the elastic sealing member 4, and the convex portions 11A and 12A are pressed against the upper and lower surfaces of the elastic sealing member 4, thereby The upper and lower surfaces are each deformed into a concave shape, and this deformation promotes refraction in which the side wall minimum portion 41 protrudes outward.
[0047]
And by adopting the elastic sealing member 4 having such a function, first, in the first stage of blocking the branch hole A1 drilled in the branch source pipe A, as shown in FIG. The sealing surface 4A thus formed is brought into close contact with the inner surface around the branch hole A1, and reliable sealing is possible. The branch joint G is attached to the branch hole A1 to seal the inside of the branch joint G. In the second stage shut-off, the elastic sealing member 4 is drawn into the branch joint G, and as shown in FIG. 5, the compression state is changed to change the elastic sealing member 4 to the inner surface of the branch hole in the branch joint. In this case, reliable sealing is possible. Therefore, sufficient shut-off performance can be obtained even in multi-stage shut-off.
[0048]
An example of a no-blow work method for an active pipeline using the pipeline branching section blocking jig of the above-described embodiment will be described below.
[0049]
As an example, the work method in the branch pipe removal work will be described. FIG. 6 is an explanatory view showing each step. In FIG. 4A, a chain B is wound around a branch source line A, a drilling machine base C called a grooved saddle is attached, a drilling machine E is mounted on the base C, and a branch hole is formed in the branch source pipe A. A1 is formed. Next, as shown in FIG. 2B, a no-blow work bag D is mounted in the opening C1 of the base C so as to cover the punching machine E. In this no-blow working bag D, the punching machine E is removed and the jig 1 is inserted into the branch hole A1. At this time, the jig 1 is provided in advance in the no-blow work bag D. When the length of the jig 1 is longer than the height of the no-blow work bag D, the jig 1 is deployed with the upper part of the jig 1 protruding from the jig projection hole D1 provided in the no-blow work bag D.
[0050]
Then, by one-handed operation in the no-blow work bag D, the jig 1 is brought into a compression deformed state as shown in FIG. 2, and the branch hole A1 is sealed from the inner side of the branch source line A, and the first-stage blocking is performed. I do. At this time, the sliding operation member 10B of the jig 1 is pushed downward, and it is confirmed that the engaging projection 10a and the engaging portion 2b of the base shaft member 2 are engaged.
[0051]
When this first-stage blocking is completed, the base C and the no-blow work bag D provided around the branch hole A1 can be removed from the branch source line A. Therefore, as shown in FIG. 3C, a state where nothing is provided around the branch hole A1 can be formed while the branch hole A1 is sealed from the inside of the pipe with the jig 1 and the no-blow state is maintained. At this time, safety is ensured by lowering the adjusting / fixing nut 10A in the direction of the arrow to fix the compression deformation state.
[0052]
Next, as shown in FIG. 4D, from the upper side of the jig 1, the branch joint G with the upper plug removed is screwed into the branch hole A1 and temporarily attached. As described above, since the outer diameter of the jig 1 is set smaller than the minimum inner diameter of the branch joint G, the branch joint G is mounted in the branch hole A1 through the exposed portion of the jig 1 outside the pipe in the branch joint G. Can do. Thus, since the branch joint G can be connected in a state where nothing is provided around the branch hole A1, a long relay pipe is fixed in advance as the branch joint G like a branch joint with a transition. There is no problem even if it is adopted.
[0053]
Next, by operating the engagement release button 10b of the jig 1, the engagement between the engagement protrusion 10a of the sliding operation member 10B and the engagement portion 2b of the base shaft member 2 is released, and the elastic seal is reduced in diameter. The stop member 4 is pulled into the branch joint G. Then, the adjustment / fixing nut 10 </ b> A is rotated to adjust the compression deformation state of the elastic sealing member 4, and the second stage of blocking the inside of the branch joint G is performed. At this time, after the elastic sealing member 4 is reduced in diameter, the jig 1 is pulled up, and the reference line 3A shown in FIG. (The reference line 3A is marked so that the distance from the reference line 3A to the lower end of the elastic sealing member 4 matches the height of the branch joint G). After confirming that the second-stage shut-off has been performed reliably, the branch joint G is permanently installed in the branch hole A1.
[0054]
Then, as shown in FIG. 4E, the test equipment T is mounted on the upper opening G1 of the branch joint G, and pressure is applied from the upper opening of the branch joint G to connect to the downstream side of the branch joint G. Perform an airtight test on the branch pipe.
[0055]
Finally, as shown in FIG. 6 (f), the upper opening G1 of the branch joint G is covered with a no-blow work bag D, and the jig 1 is removed from the branch joint G by an operation in the no-blow work bag D. The plug G3 is attached to the upper opening G1 of the branch joint G. Then, the no-blow work bag D is removed to complete the work. At this time, when the jig 1 is long with respect to the height of the no-blow work bag D, the jig 1 is removed by projecting the upper portion of the jig 1 from the jig projecting hole D1 described above.
[0056]
According to such an operation method, the existing drilling machine pedestal C and the no-blow work bag D can be used as they are in the case of taking out the branch pipe using a branch joint with a transition, which was not possible with the conventional method. A complete no-blow operation can be performed without using equipment. Further, by providing the no-blow work bag D with the jig projecting hole, even if the jig 1 becomes long, the upper part of the jig 1 can be projected into the jig projecting hole. Therefore, there is no need to greatly change the no-blow work bag D, and it can be handled by existing equipment.
[0057]
The no-blow work method for the active pipe line using the pipe branch portion blocking jig according to the embodiment of the present invention is not limited to the above-described work method in the branch pipe taking-out work. It can be applied in the work. For example, it can be used effectively in the work method for removing branch pipes and branch joints that perform the reverse process of the above-mentioned method, and work for exchanging clamps for pipes that use clamps as branch parts Even in the construction method, it can be used effectively. Further, it can also be used as an alternative to the stopper (search stopper) of the branch joint shown as a conventional example.
[0058]
Then, according to the work method using the jig of the present invention, the existing no-blow work bag or the punching machine base (saddle with groove) can be used as it is, and the no-blow work can be performed with a simple work process. Moreover, the application range of object construction can be expanded compared with the conventional construction method, and workability can be improved. Furthermore, in gas pipe construction, construction can be completed by no-blow work, so safety is improved and no-blow work is performed in a live pipe state, so that pressure fluctuation due to construction is small, and work for neighboring customers can be performed. Less impact.
[0059]
【The invention's effect】
Since the present invention is configured as described above, even in a construction method in which a no-blow work bag is forced to be temporarily removed from around the branch hole as in the case of using a branch joint with a transition, the existing equipment is used as it is from the beginning. A no-blow operation can be performed, and in this operation, there are a plurality of operations such as a first step of blocking the branch hole of the branch source pipe and a second step of blocking the inside of the branch joint attached to the branch hole. In this stage, sufficient blocking performance can be obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a configuration of a pipe branching section blocking jig according to an embodiment of the present invention.
FIG. 2 is an explanatory view showing a configuration of a pipe branching section blocking jig according to an embodiment of the present invention (a state where an elastic sealing member is compressed and deformed).
FIG. 3 is an explanatory view for explaining the form and function of an elastic sealing member in a pipe branching portion blocking jig according to an embodiment of the present invention (FIG. 3 (a) shows each state of the elastic sealing member 4; (B) is an external perspective view thereof).
FIG. 4 is an explanatory view for explaining the form and function of an elastic sealing member in a pipe branching portion blocking jig according to an embodiment of the present invention (FIG. 4 (a) shows each state of the elastic sealing member 4; (B) is an external perspective view thereof).
FIG. 5 is an explanatory view for explaining the form and function of an elastic sealing member in a pipe branching portion blocking jig according to an embodiment of the present invention (FIG. 5 (a) shows each state of the elastic sealing member 4; (B) is an external perspective view thereof).
FIG. 6 is an explanatory diagram illustrating an example of a no-blow work method for an active pipe line using the pipe branching section blocking jig according to the embodiment.
FIG. 7 is an explanatory diagram of a conventional technique.
[Explanation of symbols]
1 Jig (Jig for shutting off pipe branch)
2 Basic shaft member 2a Screw part 2b Engagement part (engagement means)
3 Tubular member
4 Elastic sealing member 4A Sealing surface
40 hollow part 41 minimum thickness part
42 Central part 43 Air vent hole
44A, 44B Through hole
5 In-pipe contact member 5A Mounting part
5B Attachment part 5C Adjustment screw part
6 Spring member (elastic repulsion member)
10 Operation part
10A Adjustment / fixing nut (Adjustment / fixing means)
10B Sliding operation member
10a Engaging protrusion (engaging means)
10b Disengagement button (disengagement means)
11 Upper pressure piece 12 Lower pressure piece
A Branch source pipe A1 Branch hole
D No blow work bag
G branch fitting

Claims (8)

A pipe having an outer diameter that passes through a branch hole of the pipe branching portion with respect to a pipe branching portion to which the branch pipe is connected to the branching source pipe, and is inserted into the branching hole to block the pipe branching portion. A road branching section blocking jig,
A pair of pressure pieces that can be moved close to and away from each other by operation from outside the tube;
An elastic sealing member that is compressed and deformed by a proximity operation of the pressure piece and can seal the branch hole;
The elastic sealing member has a cylindrical or barrel-shaped outer shape, and a hollow portion is formed therein, and a side wall thickness minimum portion formed by the hollow portion is formed above the upper and lower centers, and the compression deformation A pipe branching section blocking jig characterized in that an outer diameter increases in accordance with the state and a sealing surface that can be brought into close contact with the inner surface of the branch source pipe is formed. A pipe having an outer diameter that passes through a branch hole of the pipe branching portion with respect to a pipe branching portion to which the branch pipe is connected to the branching source pipe, and is inserted into the branching hole to block the pipe branching portion. A road branching section blocking jig,
A base member, a cylindrical member that slides up and down along the base member, and one side provided on the side of the cylindrical member and the other provided on the side of the base member, the cylindrical member with respect to the base member A pair of pressure pieces that can be moved close to and away from each other by sliding, an elastic sealing member that is disposed between the pressure pieces and through which the base shaft member passes, and an inner surface of the branch source pipe that is connected to a lower end of the base shaft member An in-tube abutting member that abuts on
The elastic sealing member has a cylindrical or barrel-shaped outer shape and has a hollow portion formed therein, and a side wall thickness minimum portion formed by the hollow portion is formed above the center in the vertical direction, and the cylindrical shape By sliding the member downward along the base shaft member, the member is compressed and deformed in the branch source pipe, and the outer diameter increases according to the state of the compression deformation, and the inner surface of the branch source pipe is formed. A jig for shutting off a pipe branching portion, wherein a sealing surface capable of being in close contact is formed.   An engagement means for engaging the cylindrical member and the base shaft member with the sealing surface formed, an engagement release means for releasing the engagement, and an adjustment for adjusting or fixing the compression deformation state The pipe branching section blocking jig according to claim 2, further comprising an operation section having a fixing means.   The pipe branching portion blocking jig according to claim 2 or 3, wherein the in-pipe contact member includes an elastic repulsion member that urges the sealing surface upward.   The pipe branching portion blocking jig according to any one of claims 2 to 4, wherein the in-pipe contact member has an attachment part that can be replaced or adjusted according to the diameter of the branching source pipe. . A no-blow work method using the pipe branching section blocking jig according to claim 1 ,
Covering the periphery of the pipe branching portion with a no-blow work bag in which the jig is disposed;
The jig is inserted into the branch hole in the no-blow work bag, and the elastic sealing member of the jig is compressed and deformed in the branch source pipe by an operation in the no-blow work bag. A branching section blocking step for sealing the branch hole by bringing the formed sealing surface into close contact with the inner surface of the branch source pipe;
And a step of removing the no-blow working bag after the branching section blocking step. After the step of removing the no-blow working bag,
Temporarily attaching a branch joint to the branch hole;
Adjusting the compression deformation state of the elastic sealing member and sealing the branch hole in the branch joint;
The no-blow work method according to claim 6 , further comprising: attaching a no-blow work bag to the upper opening of the branch joint and removing the jig in the no-blow work bag. The Noburo working bag has a jig protrusion hole, claim 6, characterized in that protruding the upper portion of the jig to the jig protrusion hole when deploying or removing the jig to the Noburo working bag Or the no blow work method of 7 .

Images