JPS61112889A - Tool for executing fluid pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction tool used for construction such as tapping on fluid pipes such as gas pipes and water pipes.

Conventional Technology When attaching a branch pipe to a pipe such as a gas pipe or water pipe, it is necessary to drill a horizontal hole in the pipe. A tool for drilling such a horizontal hole is generally referred to as a tapping tool, regardless of whether the horizontal hole is a screw hole. The name comes from the fact that conventionally, most of these types of piping were steel pipes, so when attaching a branch pipe to the main pipe, a threaded hole was formed directly from the outer periphery of the main pipe, and the branch pipe was threaded directly or through a joint pipe. This is because they were fitted. By the way, in recent years, especially in the case of gas pipes, resin pipes such as polyethylene have come to be used frequently instead of steel pipes for the purpose of earthquake resistance or weight reduction. For reasons such as strength, it is not possible to drill screw holes in such resin pipes, so when installing branch pipes, a joint pipe (resin pipe) called a saddle or cheese is fixed to the outer periphery of the main pipe. (Generally, a heat fusion method is employed since resins are joined together.) Then, a branch pipe is fixed (generally fused) to this saddle either directly or via another joint pipe. After fixing the saddle to the main pipe, it is necessary to form a horizontal hole in the main pipe from inside the saddle to communicate the main pipe and the saddle, and therefore the main pipe and the branch pipe, but the horizontal hole at this time needs to be a screw hole like before. Instead, a simple through hole is sufficient. Despite this, the process of making horizontal holes (not screw holes) in resin pipes is called tapping, a remnant from the time when horizontal holes (threaded holes) were formed in steel pipes. Therefore, although the term ``tapping pa'' is used in the text, it does not necessarily mean ``thread hole'' machining.

However, since screw holes can also be drilled using the construction tool of the present invention, "screw holes" are not excluded.

Particularly in the case of gas pipes, the process of drilling a horizontal hole without stopping the gas, that is, while the gas is flowing inside the gas pipe, is called hot tapping, while the same process performed with the gas turned off is called cold tapping. There is. Of course, hot tapping is desirable in order to initiate the suspension of gas supply to each customer, but in the case of hot tapping, if a horizontal hole is drilled in the gas pipe, the internal gas will not be released to the outside from there. Special measures are required to make this happen. This method of preventing gas from being released to the outside is called a no-blow construction method, but none of the conventional no-blow construction methods were satisfactory. For example, the no-blow construction method, in which balloons are placed in advance on both sides of the tapping point of the gas main and inflated to shut off the gas, requires additional work to drill a horizontal hole to insert the balloon into the gas pipe. Not only is this necessary, but these side holes must be finally sealed airtight by some method, and measures must also be taken to prevent gas leakage from them.

Separately, the cylindrical tapping tool body into which the tapping drill spindle is inserted is provided with an opening in the direction perpendicular to the spindle axis, and a plate-shaped shutoff valve is inserted therein airtightly and slidably. The construction method is also known. However, when the plate-shaped F1 valve is brought to the closed position, the entire surface of the plate is directly exposed to gas pressure, so the plate tends to bend, resulting in a gap in the sealing area from which gas can escape. The problem of leakage has been pointed out.

Problem 11 to be Solved by the Invention In view of the above-mentioned prior art, the problem to be solved by the present invention is how to easily and reliably realize hot tapping while avoiding the risk of gas leakage. It is in.

Therefore, the inventor of the present application focused on adopting a squeeze method in which the cylinder is closed by squeezing it from the outside as a no-blow method, and set the problem of how to realize the concept of this squeeze method. be. Although the concept of the present invention is based on hot tapping of gas pipes, as will be clear from the following explanation, it is not limited thereto, and can be broadly applied to various constructions of fluid pipes in general. .

Means for Solving the Problems In order to solve the above problems, the present invention provides an end plate having an insertion hole for fluid-tightly inserting a mouthpiece portion for attachment to a joint pipe and a construction spindle. A fluid pipe construction tool is provided that has a cylindrical body section that connects the mouthpiece section and the end plate section and is elastically deformable and restorable.

According to yet another second aspect of the invention, in addition to the above-mentioned configuration, the fluid pipe construction tool includes a means for mechanically squeezing the body, which is provided around the body to crush and close the body from the outside. A stenosis pinch is attached.

According to yet another third invention, in addition to the structure of the second invention, there is provided a predetermined portion which is fluid-tightly and rotatably inserted into the body through the insertion hole of the end plate portion and which can protrude to the outside from the mouthpiece portion. A construction spindle with a construction tool is added.

LfL Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 5 shows an example of a saddle S that connects a resin pipe (main pipe) Pl and a resin pipe (branch pipe) P2. The saddle S is fixed on the outer periphery of the pipe P1 so as to straddle it in a direction perpendicular to the pipe axis (
A saddle part 3 to be fused (welded), a branch pipe connecting part 5 to which a pipe P2 extending in a direction perpendicular to the pipe P1 is fixed (fused), and a tapping tool for tapping the pipe P1 later are inserted. The sealing portion 7 is hollow inside and communicates with each other. A male thread is formed on the outer periphery of the sealing portion 7, and a female thread is formed on the inner periphery. Finally, a nut-shaped plug 8 (Fig. 4) is screwed into this female thread, and a screw cap 9 is fitted into the male thread to prevent gas from leaking from the sealing part 7. Make sure not to. After fixing the saddle S as described above to the pipe P1 (at this time, the pipe P2 is already fixed to the branch pipe connection part 5), the pipe P1 is tapped (drilled) to form a hole 6,
It is necessary to communicate the internal region of pipe P1 and the internal region of pipe P2. During this tapping process, the construction tool (FIGS. 1 to 4) according to the present invention is used.

The construction tool according to the present invention basically includes a cylindrical body 21,
Mouthpieces 23 attached to both ends of these bodies 21
and an end plate 2. The body 21 is made of a material that can be elastically deformed (elastically restored), such as rubber, low-density polyethylene, synthetic resin, or sponge. fuselage 2
1 is preferably formed as a cylinder, into which openings at both ends a mouthpiece 23 and an end plate 25 are press-fitted. The mouthpiece 23 and the end plate 25 are preferably made of a rigid material and each have a cylindrical shape with seven flange portions 27,29 around the circumference. The mouthpiece 23 and the end plate 25 each have cutouts 31 and 33 in their cylindrical body portions to ensure secure fixation of the shakuhachi to the body 21. Mouthpiece 23 and end plate 25
can also be integrally formed as part of the fuselage 21.

An internal thread 35 is formed in the opening at the tip of the mouthpiece 23, and by screwing in the external thread of the locking part 7 of the saddle S described above, the construction tool can be attached to the saddle. A shoulder portion 37 having a seal ring 39 is formed on the inner diameter portion of the mouthpiece 23, and the mouthpiece 23 is attached to the saddle S.
When the saddle S is screwed into the sealing part of the saddle S, the outer end of the sealing part of the saddle S is pressed against the seal ring 39 to prevent gas leakage from the threaded fitting part. An adapter 5 as shown in FIG. 3 may be attached to the internal thread 35 of the mouthpiece 23 as necessary
1 can be attached.

The adapter 51 has an outer diameter threaded portion 53 that is screwed into the inner diameter thread 35 of the mouthpiece 23, and has an inner diameter thread 55 at its tip opening. When there are multiple external shapes of the sealing part 7 of the saddle S (actually, the diameter of the saddle differs depending on the diameter of the gas pipe, so

(The diameter of the sealing part 7 is not one type), by attaching the adapter 51 as described above to the mouthpiece 23, the diameter of the inner diameter threaded part 55 of the adapter 51 becomes the outer diameter thread of the sealing part 7 of the saddle S. It can be applied to various saddles by simply selecting the one that matches the diameter of the saddle. 57 is a seal ring incorporated into the adapter 51.

An insert member 41 having an insertion hole 43 for inserting a construction spindle 71 (FIG. 3) is removably inserted into the end plate 25. The bolt 45 is a stopper for the insert member 41 fixed to the end plate 25, and the insert 41 is fixed to the end plate 25.
If you rotate the bolt slightly, the head of the bolt 45 will be
The insert 41 is eccentric to the hole 46 having a larger diameter than the head of the
will no longer fall out of the end plate 25. The insert member 41 can also be integrally formed as a part of the end plate 25. A seal ring 47 for preventing gas leakage is preferably provided in the insertion hole 43.

49 is also a seal ring provided between the insert member 41 and the end plate 25, but when the insertion hole 43 is formed directly in the end plate 25 (when the insert member 41 is a part of the end plate 25) Naturally, four seal rings are unnecessary.

Since the body 21 is formed of an elastically deformable material as described above, it is possible to crush and close the body 21 by applying an external force P from the outer periphery (as shown in FIG. 6). The external force P can be applied manually by the operator, but it is preferable to apply the stenosis pinch 6 as shown in Fig. 1.2.
1 is provided. The pinch 61 has a pair of pinch levers 65, 67 secured to a shaft 63 spanning between the flange 27 of the mouthpiece 23 and the flange 29 of the end plate 25. The pinch lever 65, 67 has a pivot 69 on the shaft 63.
is pivotally supported for relative rotation. That is, the pinch levers 65 and 67 open and close around the pivot 69, and
At the fully open positions 65' and 67' shown in the figure (the position where the pinch levers 65 and 67 are parallel), the fuselage 21 is
It is completely occluded as shown by '. In addition, 21" indicates a state in which the body 21 is in the middle of narrowing. One of the pinch levers 65 and 67,
For example, a locking means (hook 73) is attached to the tip of the pinch lever 65 via a pin 72, and the other pinch lever 67
A roller 75 is rotatably supported at the tip of the roller 75 via a pin 77. Hook 73 engages roller 75, as shown at 73', in the fully open position of pinch lever 65,67, locking pinch lever 65,67 in the fully open position. This pinch lever mechanism itself is similar to one widely used as a means for closing the mouth of a water pillow used as a medical device, for example. The pivot 69 of the pinch lever 65,67 may be axially movable along the axis 63.

In the insertion hole 43 of the insert member 41, a spindle 71 having a cutter or a drill 81 fixed thereto in a removable manner is rotatably and movably mounted in the axial direction. A seal ring 47 provides fluid tightness between the spindle 71 and the insertion hole 43. A handle 73 is attached to the outer end of the spindle 71, and by turning the handle, the spindle 71
Therefore, the drill 81 can be easily rotated.

The drill 81 can be inserted into the body 21 through the mouthpiece 27 or the inner diameter bore of the adapter 51, or from the inside of the body 21 to the outside. In this way, after the construction tool of the present invention is attached to the saddle S, the handle 73
By applying feed in the axial direction while rotating the spindle 71, the horizontal hole 6 (FIG. 5) can be drilled into the pipe P1 through the saddle S using the drill 81.

When the horizontal hole 6 is formed in the pipe P1, the pipe Pl
When the gas inside flows into the vibe P2 through the saddle S, it also fills the body 21. Then, the spindle 71 is pulled out using the handle 73 until the tip of the drill 81 is on the right side of the pinch 61 in FIG. 3, and then the body 21 is closed using the pinch levers 65 and 67.

As a result, the gas is completely shut off at the closed portion of the body 21. Next, the insert member 41 and the spindle 71 are pulled out from the end plate 25. At this time, it is necessary to rotate the insert member 41 slightly until the bolt 45 and the hole 46 are in a concentric position.

The gas trapped in the body 21 on the right side of the pinch 61 is released to the outside as soon as the insert member 41 is pulled out, but the amount of released gas is so small as to cause no problem.

Next, the drill 81 is attached to a square wrench member 83 as shown in FIG.
After replacing the plug (nut) 8 therewith, the insert member 41 is inserted into the end plate 25 again. Once the insert member 41 is attached to the end plate 25, the insert member 41 is again slightly rotated until the bolt 45 is eccentric with respect to the hole 46 and acts as a stopper. Then, the pinch levers 65 and 67 are released to restore the fuselage 21 to the initial position shown in FIG. Thereafter, by rotating the spindle 71 using the handle 73 and sending it in the axial direction in the same manner as in drilling, the plug 8 can be screwed into the internal thread of the sealing part 7 of the saddle S. When the installation of the plug 8 is completed, remove the adapter 51 or mouthpiece 23 from the saddle S,
The work is completed by screwing the cap 9 onto the saddle S.

When replacing tools such as the drill 81 or the wrench 8, the entire spindle 71 may be replaced, or only the tool may be replaced. Further, various tools such as tapping tools for thread cutting or tools for grooving can be attached as necessary.

The construction tool of the present invention is applicable not only to gas pipes but also to water pipes, chemical pipes, and other fluid pipes in general.

The present invention is particularly effective when the main pipe P1, branch pipe P2, saddle S, etc. are all made of resin such as polyethylene, but is not limited thereto, and can be applied to general steel pipes. may also be applied.

Furthermore, although the present invention is primarily intended for performing tapping work on laid pipes on site, it can of course also be used when tapping work on piping pipes in advance at a factory or the like.

11 animals 1l As described above, according to the present invention, there is provided a construction tool that can easily and reliably perform required construction on fluid pipes while substantially eliminating fluid leakage.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional front view of the construction tool according to the present invention (cross-sectional view taken along line II in FIG. 2), FIG. 2 is a right end view of FIG. 1, and FIG. 3 is another construction tool according to the present invention. A cross-sectional plan view of the tool, FIG. 4 is a partial view of the construction tool of the present invention when performing another construction, FIG. 5 is a partial cross-sectional view showing an example of a saddle connecting a main pipe and a branch pipe, and FIG. The figure shows the closed state of the body of the construction tool. 21... Body, 23... Mouthpiece, 25...
End plate, 43...insertion hole, 61...pinch, 71...
·spindle, . Pl, P2...pipe, S...saddle. Figure 1 1 Pi 21 1Ill Body 23 Mouthpiece 2
5 End plate 43 insertion hole 61 Pinch 7] Spindle S Saddle-L

Claims (1)

[Scope of Claims] 1. A fluid pipe construction tool used by being attached to a joint pipe fixed on the outer periphery of a fluid pipe such as a gas pipe or a water pipe, which comprises a mouthpiece portion for attaching to the joint pipe and a construction tool. A fluid pipe construction tool having an end plate portion provided with an insertion hole into which a spindle is fluid-tightly inserted, and a cylindrical body portion that connects the mouthpiece portion and the end plate portion and can be elastically deformed and restored. . 2. A fluid pipe construction tool that is used by being attached to a joint pipe fixed on the outer periphery of a fluid pipe such as a gas pipe or water pipe, in which the mouthpiece part and the construction spindle for attaching to the joint pipe are fluid-tight. An end plate portion provided with an insertion hole for insertion, a cylindrical body portion that connects the mouthpiece portion and the end plate portion and is elastically deformable and restoreable, and a body portion provided around the body portion. A fluid pipe construction tool that has a constriction pinch that crushes and closes the pipe from the outside. 3. A fluid pipe construction tool that is used by being attached to a joint pipe fixed on the outer periphery of a fluid pipe such as a gas pipe or water pipe, in which the mouthpiece part and the construction spindle for attachment to the joint pipe are fluid-tight. An end plate portion provided with an insertion hole for insertion, a cylindrical body portion that connects the mouthpiece portion and the end plate portion and is elastically deformable and restoreable, and a body portion provided around the body portion. Stenosis pinch, which is compressed and occluded from the outside,
A fluid pipe construction tool comprising: a construction spindle having a predetermined construction tool that is fluid-tightly and rotatably inserted into the body through the insertion hole of the end plate portion and can be projected to the outside from the mouthpiece portion.