JPH0252159B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a non-flow branching system for connecting a branch pipe to a main pipe, such as for city gas, while continuing fluid transport through the main pipe. Regarding split joints.

[Conventional technology]

Conventionally, as shown in Fig. 10, a split joint A' attached to the main pipe B has a port for inserting and removing the hole saw 8' of the drilling machine D', and a slide shaft for opening and closing the port. A turret-type shutoff device 20 is provided, and with the shutoff device 20 open, the hole saw 8' is pushed toward the center of the main pipe B.
A hole is formed in the main pipe B, and with the hole saw 8' pulled out and the shutoff device 20 closed, the drilling machine D' is removed from the split joint A', and as shown in FIG. As shown in Figure 12, the branch pipe E is connected to the split joint A' by the valve C' and the connecting pipe E'.
I had configured it to connect to A″.

On the other hand, as shown in Japanese Unexamined Patent Publication No. 50-95812, a branch pipe connection port for connecting to the main pipe is formed in one side of the split joint member for the main pipe in a direction substantially perpendicular to the main pipe, and A hole saw that forms a hole that communicates with the branch pipe connection port is deviated toward the branch pipe connection port side with respect to the main pipe, and is installed in a direction that intersects the branch pipe connection port, and the hole saw is pushed in to create a hole in the main pipe. There is also another type in which the branch pipe connected to the branch pipe connection port is formed so as to communicate with the main pipe, and the hole saw is moved back and left inside the split joint member after the hole is formed. It was hot.

[Problem to be solved by the invention]

However, in the former prior art, when a horizontal hole is formed in the buried main pipe B and the horizontal branch pipe E is concentrically connected to the horizontal hole, the joint A' In order to secure installation space for the drilling machine D′ connected to the horizontal opening of The disadvantage was that it required a lot of effort and expense for the work and disposal of the earth and sand.

In addition, since a hole must be formed in the main pipe B with a hole saw 8' directed toward the center of the main pipe B, if a hole with a large opening area is to be formed to increase the transportation capacity of the branch pipe E, a large-sized drilling machine is required. D' was required, and the drilling work required a lot of effort and expense.

The latter conventional technique has the drawback of increasing construction costs because an expensive drilling machine such as a hole saw must be left in place.

The object of the present invention is to connect a horizontal branch pipe concentrically to a horizontal hole formed in a buried main pipe, thereby reducing the horizontal cross-sectional area of the underground hole and reducing the amount of excavated soil. In addition, when forming a hole with a large opening area in the main pipe, the drilling work can be easily performed using a small drilling machine, and all the expensive tools such as the drilling machine that do not need to be left behind can be recovered. Eliminates fluid leakage caused by the problem, improves workability,
The object of the present invention is to provide a non-flow splitting joint for branching which is advantageous in terms of construction costs.

[Means to solve the problem]

A characteristic configuration of the present invention is that a branch pipe connection port for connecting to the main pipe is formed in one of some split joint members for the main pipe in a direction substantially perpendicular to the main pipe, and the branch pipe is connected to the main pipe. A drilling port for inserting and removing a hole saw of a drilling machine that forms a hole communicating with the connecting port is deviated toward the branch pipe connecting port with respect to the main pipe, and in a direction intersecting with the branch pipe connecting port. A screw is formed in the split joint member for screwing a plug that is formed toward the hole and closes the hole, and an opening/closing shutoff device that communicates with the entrance of the hole is removably connected to the split joint member. A connecting part for selectively attaching the perforating machine and a stopper plug mounting machine for screwing together the plug is provided on the entrance side of the opening/closing type shutoff device, and its effects are as follows. It is.

[Effect]

In other words, the branch pipe connection port is placed in a direction almost perpendicular to the main pipe, and the drilling port for inserting and removing the hole saw is placed in a direction that intersects the branch pipe connection port at a position that is biased toward the branch pipe connection port with respect to the main pipe. Therefore, as shown in Fig. 8, attach the joint A to the main pipe B with the branch pipe connection port 5 facing horizontally and the perforation port 4 facing upward, and use a hole saw to form the hole 12 in the main pipe B. , the horizontal branch pipe E can be concentrically connected to the horizontal hole 12.

As shown in Fig. 1, since the blocking device C and the drilling machine D are attached to the upward-facing drilling port 4 in an upwardly extending state, the horizontal cross-sectional area of the underground hole for operation with respect to the buried main pipe B can be reduced. , can be significantly reduced compared to the case of the former prior art described above, and by greatly reducing the amount of excavated soil, the labor and expense required for excavation work, backfilling work, and disposal of earth and sand can be sufficiently reduced.

In addition, the hole 12 formed in the main pipe B with a hole saw from the perforation port 4 which is deviated toward the side of the branch pipe connection port 5 with respect to the main pipe B is as shown in FIG. 12, and the transportation capacity of the branch pipe E can be increased, and the work can be easily carried out using a small-sized drilling machine D.

When the drilling work is completed, as shown in Fig. 7, the hole saw of the drilling machine D is pulled back to the outside of the isolation device C and the isolation device C is closed, and then the drilling machine D is operated without fluid leakage. After removing and recovering from the shutoff device C, and attaching the stopper plug installation machine F to the shutoff device C and opening the shutoff device C, the stopper plug installation machine F screws the plug 9 into the thread of the split joint member. After that, the cutoff device C and the stopper plug installation machine F are removed from the split joint member and recovered in a state where there is no fluid leakage. In other words, the expensive drilling machine D, cutoff device C, and stopper plug installation machine F, which are expensive and do not need to be left behind, can all be recovered in good working condition with no fluid leakage, making it even more effective in improving work efficiency and reducing construction costs. can be achieved.

[Effect of the invention] As a result, when a horizontal branch pipe is concentrically connected to a horizontal hole formed in a buried main pipe, the labor and expense caused by underground holes for work are greatly reduced. In addition, when forming a hole with a large opening area in a main pipe to increase the transportation capacity of a branch pipe, a small-sized drilling machine can perform the drilling work with less labor and cost, and there is no need to leave an expensive drilling machine behind. It has now become possible to provide a non-flow type split joint for branching, which can be recovered from all stopper plug mounting machines without fluid leakage, and which is advantageous in terms of both workability and construction costs.

〔Example〕

Next, an example will be shown with reference to FIGS. 1 and 2.

Non-flow type split joint A is a pair of split joint members.
The split joint members A ₁ and A ₂ are configured so that they can be attached to the main pipe B by connecting two bolts between opposing flanges ₁ while in contact with _the outer peripheral surface of the main pipe B.

Main pipe B is connected to one split joint member A ₁ through an open/close type shutoff device C bolted to its flange T.
A drilling port 4 for inserting and removing the hole saw 8 of the drilling machine D into and out of the hole, and a branch pipe connection port 5 for connecting to the main pipe B are formed. The perforation port 4 is formed in a direction that intersects the branch pipe connection port 5 at an angle of approximately 90 degrees, and the perforation port 4 is formed in the main pipe so that the hole saw 8 cuts the main pipe side wall portion b facing the branch pipe connection port 5. A screw 6 is formed at the outer end of the perforation port 4 to screw the closure plug into the hole 4, and is offset toward the branch pipe connection port 5 side with respect to the hole B.

The branch pipe connection port 5 is formed to have an inner diameter that is the same as or approximate to the inner diameter of the main pipe B and the branch pipe E, and is formed in a direction substantially perpendicular to the main pipe B.

Next, how to use the above-mentioned non-flow splitting joint A will be explained.

[1] As shown in FIG. 1, a split joint A is attached to the main pipe B, a shutoff device C is attached to the perforation 4, and a branch pipe E is connected to the branch pipe communication port 5.

[2] As shown in FIG. 6, a new section Y is laid by connecting many branch pipes E. If the pressure is relatively high, install a dissipation pipe 10 in the middle of the newly installed part Y.
It is desirable to provide a shutoff device 11. It is preferable to install the blocking device 11 at a location other than an intersection that is convenient for maintenance and management.

[3] Perform an airtightness (watertightness) test on the entire newly installed section Y, including split joint A. This test is administered by B
It is desirable to carry out the operation under a pressure that is greater than the transport fluid pressure of .

[4] As shown in Figure 1, attach the drilling machine D to the cutoff device C, open the cutoff device C, and then
is inserted into the split joint A through the drilling hole 4, and the main pipe side wall portion b is cut with a hole saw 8 to form a hole 12 in the main pipe B that communicates with the branch pipe connection port 5, thereby connecting the main pipe B and the newly installed part Y. let However, when the transport fluid is at high pressure, the shutoff device 11 of the newly installed section Y is closed and air is purged from the dissipation pipe 10 in front.

At this time, the opening area of the hole 12 can be made large enough to be comparable to the flow path area of the main pipe B, although the hole saw 8 has a considerably smaller diameter than the main pipe B, as shown in FIG.

[5] Pull up the hole saw 8, close the shutoff device C, and remove the drilling machine D.

[6] As shown in FIG. 7, the stopper plug mounting machine F is attached to the shutoff device C, the shutoff device C is opened, and the stopper plug 9 is screwed into the screw 6 of the drilling hole 4.

[7] Remove the shutoff device C and attach the blind flange 13 to the split joint A outside the plug 9 as shown in Fig. 8.
Install.

[8] If necessary, operate the shutoff device 11 of the new section Y to purge the entire line with air.

[Another example]

Next, another embodiment will be described.

When forming the perforation port 4, the angle and direction thereof can be changed appropriately, and the intersection angle α of the perforation port 4 with respect to the branch pipe connection port 5 can be made smaller than 90 degrees as shown in FIG. 3, or as shown in FIG. As shown in FIG. 5, the axis of the perforation port 4 is included in the virtual plane that includes the axes of the main pipe B and the branch pipe connection port 5, or the axis of the perforation port 4 is made to be included in the virtual plane as shown in FIG. The core can be tilted.

The facing surfaces of the flanges 1 do not necessarily need to be perpendicular to the axis of the branch pipe connection port 5, but may be set at an appropriate angle to the axis of the branch pipe connection port 5, as shown by the imaginary line in FIG. It may also be possible to make the axis of the perforation port 4 closer to the axis of the main pipe B by tilting it by β, thereby increasing the perforation area.

To connect the branch pipe E to the branch pipe connection port 5, the branch pipe E may be inserted into the branch pipe connection port 5, or may be connected by flange joining or welding.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, with FIG. 1 being a sectional view and FIG. 2 being a side view. 3 to 5 are external views showing different embodiments of the present invention. 6 to 8 are explanatory diagrams of the construction state in the embodiment of the present invention, and FIG. 9 is a diagram illustrating the shape of the hole in the embodiment of the present invention. FIGS. 10 to 12 are explanatory diagrams of conventional examples. 4...Drilling port, 5...Branch pipe connection port, 6...Screw, 8...Hole saw, 9...Plug, 12...
Hole, A ₁ ...Split joint member, B...Main pipe, C...
Shutoff device, D...perforation material.

Claims (1)

[Claims] 1 One of a pair of split joint members for main pipe B
A branch pipe connection port 5 for connecting to the main pipe B is formed in A ₁ in a direction substantially perpendicular to the main pipe B, and a hole 12 communicating with the branch pipe connection port 5 is formed in the main pipe B. Hole saw 8 of drilling machine D
The perforation port 4 for putting in and taking out the pipe is deviated toward the branch pipe connection port 5 side with respect to the main pipe B, and
A screw ₆ is formed in the split joint member A 1 in a direction that intersects the branch pipe connection port 5 and is used to screw together a plug 9 that closes the perforation port 4;
An opening/closing shutoff device C communicating with the entrance of the perforation port 4
is removably connected to the split joint member _A1 ,
A split joint for non-flow type branching in which a connection part for selectively attaching the drilling machine D and the stopper plug mounting machine F for screwing together the plug 9 is provided on the inlet side of the opening/closing type shutoff device C.