JPH037100Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention uses the hot-tap construction method, which allows pipe branching work to be performed without reducing internal pressure. This invention relates to a jig for maintaining uniform gap dimensions between the upper fitting and the upper fitting.

[Conventional technology]

Piping branch work, stopping the fluid inside the piping,
The hot tap construction method is known as a construction method that can be carried out without causing a pressure drop within the piping.

Figures 10a to 10d show the working procedure of this hot tap construction method. This construction method is shown in Figure 10a.
Use a two-part fitting X as shown in . This fitting X consists of an upper fitting A and a lower fitting B. The upper fitting A has an opening 20 with a flange a and a female threaded part 21 at its upper part, and the lower fitting B has a branch takeout part 22. are doing.
A plug 23 is screwed into the opening 20 through its female threaded portion 21 so that it can be closed.

In the branching work, first, as shown in FIG. 10b, the upper fitting A and the lower fitting B are welded together 24 to the main pipe 1, and the branch pipe is connected to the branch outlet 22 by welding. Next, as shown in FIG. 10c, the gate valve 25 and the drilling machine 26 are sequentially installed on the upper fitting A via the flange a, and the gate valve 25 is opened to open the drill 2 of the drilling machine 26.
7. Rotate the cutter 28 down to place the main pipe 1 into the punching machine 26, and close the gate valve 25. In this state, the fluid in the main pipe 1 flows to the branch pipe. Thereafter, as shown in FIG. 10d, the drilling machine 26 is removed and the plug 23 is screwed into the female threaded part 21 of the upper fitting A using a plug tightening machine, thereby ensuring sealing and completing the construction.

In such construction, a jig 29 as shown in FIG. 11 is conventionally used to attach the upper fitting at the position where the branch pipe is taken out.

This jig 29 has a male threaded portion 30 on the outer periphery,
Upper fitting A via this male threaded part 30.
It is designed so that it can be screwed into the female threaded part 21 of
A bolt 31 having a diameter of 1 is threaded through the hole. Figures 12a and 12b show how such a jig 29 is used.A small concave hole 32 is punched at the top of the pipe circumferential surface at the position where the branch pipe of the main pipe 1 is taken out, and the jig 29 is used. 29 is attached to the female threaded portion 21 of the upper fitting A, and the upper fitting A is attached to the main pipe 1 by engaging the pointed tip 311 of the bolt 31 into the small concave hole 32 of the main pipe. Then, the bolt 31 is rotated while leveling it with a spirit level 33 provided on the jig, the gap 18 between the upper fitting A and the main pipe 1 is adjusted, and welding is performed when a predetermined gap 18 is obtained. . Generally, the gap at the fillet weld between the upper fitting A and the main pipe 1 is about 1 to 2 mm, and the inner diameter of the fillet weld of the fitting is equal to the outer diameter of the main pipe 1 when the gap is formed. It is designed to be concentric with the

[Problem that the invention attempts to solve]

However, the conventional gap extraction jig 2 as described above
9 has the following problems.

First, on-site piping is not necessarily installed horizontally, which may make it virtually impossible to use jigs. That is, as shown in FIG. 13, the bolt 31 supporting the upper fitting A is connected to the main pipe 1.
Therefore, if the main pipe 1 is inclined, the fillet weld of the upper fitting A will partially contact the main pipe, resulting in a place where the gap is zero, resulting in a uniform fillet. Welding gap cannot be obtained.

Furthermore, there are construction sites where the direction of branch pipe extraction is not necessarily horizontal, and in this case as well, it becomes virtually impossible to use a jig. In other words, when the direction in which the branch pipe 19 is taken out has a certain angle θ from the horizontal as shown in FIG. A problem arises in that it cannot be fixed to the main pipe.

The present invention was developed in view of these conventional difficulties, and aims to provide a jig that can easily and precisely gear the upper fitting, regardless of the inclination of the pipe or the direction in which the branch pipe is taken out. It is something.

[Means to solve the problem]

Therefore, the jig of the present invention includes a pair of legs that can fix each lower end to a piping part sandwiching the fitting mounting position of the piping, a connecting part that connects the pair of legs, and an end part. Its basic features are that it has a fitting mounting portion at the connecting portion, and a fitting holding rod provided at the connecting portion so as to be movable in a direction perpendicular to the piping.

[Effect]

Install the upper fitting at the branch pipe extraction position, and fix both legs of the jig to the main pipe so as to straddle it. After lowering the fitting holding rod and connecting the upper fitting to the fitting attachment portion thereof, the fitting holding rod is raised to form a gap between the upper fitting and the main pipe. Fillet welding is then performed in this state.

〔Example〕

1 to 3 show an embodiment of the present invention, and 1 is a main pipe to which a jig is attached.

Jig A has a pair of legs 2 whose lower end can be fixed to a piping part sandwiching the fitting installation position of the piping.
, a connecting portion 3 that connects the pair of legs, and a fitting holding rod 4 that is movably provided in the connecting portion.

The pair of legs 2 has a fixing part 5 at each lower end thereof for fixing to the main pipe. This fixing part 5 has a structure in which a half ring is tightened and fixed to the main pipe with bolts and nuts 6.

The connecting portion 3 is composed of two upper and lower side bars 7 that connect the upper portions of the pair of leg portions 2.
A guide cylinder 8 parallel to the legs is provided at a central position between the legs of the connecting portion 3.

The fitting holding rod 4 has a fitting attachment part 9 at its lower end, and has a male threaded part 41 and a position adjustment nut 10 screwed into the male threaded part 41 at its upper end. This fitting holding rod 4 is slidably inserted into the guide tube 8 at its longitudinally intermediate portion, so that it can move forward and backward (up and down) along the guide tube 8 in a direction orthogonal to the piping to which the jig is attached. ing.

As shown in FIG. 3, a key groove 42 is formed along the longitudinal direction of the fitting holding rod 4, and two key grooves 42 are formed in the upper and lower portions of the guide tube 8.
A key 11 that engages with the keyway 42 is attached. Each key 11 is fixed to the guide tube 8 with a bolt 12.

The nut 10 engages with the upper end of the guide tube 8, so that by rotating the nut 10 relative to the male threaded portion 41, the fitting holding rod 4 is prevented from rotating by the key 11 and the keyway 42. while sliding along the guide cylinder 8.

In this embodiment, the fitting mounting portion 9 at the lower end of the rod is constructed in the shape of a flange, and has a screw hole 91 at a position corresponding to a screw hole formed in the flange of the upper fitting.

FIG. 4 shows another embodiment of the present invention, in which a jack 13 is provided in place of the nut in the above embodiment as a mechanism for moving the fitting holding rod 4 forward and backward. That is, a jack 13 is provided at the upper center of the connecting part 3 via a reaction frame 14, and a fitting holding rod 4 is connected (screwed) to the drive shaft 15 of this jack, so that the rod can be driven up and down. It is.

FIG. 5 similarly shows another embodiment,
The fitting mounting portion 9 at the lower end of the fitting holding rod is constituted by plug bodies 16, 16' which can be screwed into the female threaded portion of the opening of the upper fitting. Specifically, a small-diameter threaded shaft portion 43 is provided at the lower end of the rod body, while the plug body 16 has a male threaded portion 161 on its outer circumferential surface and a female threaded hole 162 in its center. It is attached to the rod body by screwing the screw shaft portion 43 into the rod 162. . In this embodiment, the threads of the male threaded portion 161, threaded shaft portion 43, and female threaded hole 162 all have the same pitch.

Moreover, FIG. 6 shows another embodiment in which the fitting mounting portion 9 is similarly constructed of a plug body 16'.
In this case, the plug body 16' and the rod body are of integral construction. Further, this embodiment has a structure in which the key and keyway as in each of the above-mentioned embodiments are omitted. Further, such a structure of the fitting holding rod 4 can also be applied to the jig shown in FIG. 4.

Next, using the jigs shown in Figures 1 to 3 as an example,
The procedure for branch construction using the jig of the present invention will be explained.

First, an upper fitting A is installed at a branch position of the main pipe 1, and both legs 2 of the jig A are fixed to the main pipe 1 via their fixing parts 5 so as to straddle this. At this time, it is necessary to tilt the jig A in the circumferential direction of the main pipe depending on the angle in the direction in which the branch pipe is taken out.

Thereafter, the nut 10 is rotated to bring the fitting holding rod 4 close to the upper fitting A, and the fitting attachment part 9 is connected to the upper fitting A as shown in FIG.
Specifically, the flange-shaped fitting attachment portion 9 is butted against the flange portion a of the upper fitting A, and both are fastened with bolts 17.

Next, the nut 10 is rotated to raise the fitting holding rod 4 and lift the upper fitting A from the main pipe 1. This allows main 1
A predetermined uniform gap is formed between the main pipe 1 and the upper fitting A, and fillet welding between the main pipe 1 and the upper fitting A is immediately performed in this state.

In addition, in the embodiment shown in FIG.
As a result, the fitting holding rod 4 moves up and down.
Gap removal is performed using the same procedure.

In the embodiment shown in FIGS. 5 and 6, the plug bodies 16, 16' at the lower end of the rod are screwed into the female threaded portion (21 in FIG. 10) of the upper fitting, so that the fitting mounting portion 9 and the upper fitting A are connected to each other. A connection is made.

In the case of the embodiment shown in FIG. 5, the plug body 16 is rotated relative to the threaded shaft portion 43 of the rod body and screwed into the female threaded portion of the upper fitting A. In the case of the embodiment shown in FIG. 6, the entire rod is rotated and the plug body 16' is screwed into the internal thread of the upper fitting.

As described above, by using the jig A of the present invention, it is possible to remove the branch pipe 19 when the branch pipe 19 is taken out at a certain angle from the horizontal as shown in FIG. Even when the upper fitting A is inclined with respect to the horizontal direction, the upper fitting A can be properly held and its gap can be easily adjusted.

[Effect of idea]

According to the present invention described above, the upper fitting can be reliably held regardless of the inclination of the pipe or the direction in which the branch pipe is taken out, and the gap can be easily and precisely performed.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, with Figure 1 being a front view, Figure 2 being a side view, and Figure 3 being a side view.
The figure is a partial vertical sectional view. FIG. 4 is a front view showing another embodiment of the present invention. FIG. 5 is a partial vertical sectional view showing another embodiment of the present invention. 6th
The figure is a partial vertical sectional view showing another embodiment of the present invention. FIGS. 7 to 9 are explanatory diagrams showing how the jig of the embodiment shown in FIGS. 1 to 3 is used. FIGS. 10a to 10d are explanatory diagrams showing the working procedure for attaching the fitting. FIG. 11 is a perspective view showing a conventional gap setting jig. 1st
Figures 2a and 2b show how a conventional gap setting jig is used, with a being a cross-sectional view and b being a longitudinal cross-sectional view. FIGS. 13 and 14 are explanatory diagrams showing a state in which conventional jigs are causing problems in gap extension, respectively. In the figure, 2 is a leg part, 3 is a connecting part, 4 is a fitting holding rod, and 9 is a fitting attachment part.

Claims (1)

[Scope of utility model registration request] Each lower end has a pair of legs that can be fixed to a piping part sandwiching the fitting mounting position of the piping, a connecting part that connects the pair of legs, and a fitting mounting part at the end, A jig for gapping a fitting fillet weld in a hot tap construction method, comprising a fitting holding rod provided at a connecting part so as to be movable in a direction perpendicular to piping.