JPH0214596B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a construction communication member used for construction of gas pipes and the like.

(Prior art) The no-blow construction method is a method for cutting a gas pipe and replacing a part of the gas pipe, installing a branch pipe, or performing repairs while gas is being distributed to consumers. It was done by a method called. In this method, for example, when repairing a gas pipe at a specific location, a bypass pipe is installed across the repaired location, and gas is passed through this bypass pipe until the repair is completed. ,
This is a construction method that maintains the complete flow of gas to customers. In this method, after the bypass pipe is installed, the flow of gas to the gas pipe is temporarily stopped by inflating a rubber balloon within the gas pipe.

(Problem to be Solved by the Invention) Temporary stoppage of gas from such a rubber balloon may cause an accident due to breakage of the rubber balloon, as well as the need to prepare the rubber balloon and inflate it. equipment and handling work, etc., and there were problems with reliability and workability. Therefore, since gas pipe construction is carried out while fuel gas is being supplied to consumers, it is necessary to completely prevent accidents from occurring, and it is also important to ensure that work efficiency is high when installing bypass pipes. There are issues that must be addressed.

(Means for Solving the Problem) As a means for achieving the above object, a communication member having the following configuration is required. That is, a gas communication hole is provided in the center of the communication member in the longitudinal direction, an opening is provided in the radial direction of the gas communication hole, and a gas purge groove is provided in the longitudinal direction at the back of the opening. The communicating member having such a structure is attached to the tip of an inner tube that has an engaging portion on the upper part, and the inner tube is placed inside an outer fixing tube that has a gas purge hole, a threaded portion, and a flange portion on the lower part. A connecting member is provided at the upper part of the inner tube and includes a tightening member that engages with the engaging portion.

(Function) At the same time as the communication member deforms within the gas pipe and blocks the gas, gas flows in from the opening and is introduced into the bypass passage. Gas in the gas pipe flows into the gas purge groove at the back of the opening 3 and is discharged through the gas purge hole.

(Example) An example of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a communication member made of an elastic member such as rubber, and this communication member 1 has a gas communication hole 2 in its longitudinal center, and an opening 3 in the radial direction of the gas communication hole 2. , a gas purge groove 4 is provided at the back of the opening 3 in the length direction thereof,
The communication member 1 having such a structure is attached to the tip of an inner tube 6 which has an engaging portion 5 at its upper portion, and an outer fixing tube 10 which has a gas purge hole 8, a threaded portion 9, and a flange portion 13 at its lower portion. The inner tube 6 is inserted into the inner tube, and a tightening member 7 that engages with the engaging portion 5 is provided on the upper part of the inner tube 6.

Therefore, the method of using the connecting member having the above configuration is as follows.
The explanation will be as follows based on the drawings of the embodiment. If construction is to be carried out by cutting a specific point D of the gas pipe B, a bypass passage E must be created so that even if the specific point D is cut, there will be no problem with gas supply. For this reason, the connecting members A and A' having the above configuration are installed on the gas pipe B that straddles the specific location.

First, in Fig. 2, the pedestal 11 is placed on the gas pipe B.
is fixed, and a shutter valve C equipped with a fixing lever 12 is installed on the pedestal 11. Then, a perforator (not shown) is attached to the shutter valve C to perforate the gas pipe B, and then the perforator is removed. With the shutter valve C closed, the outer tube 10
Press the flange portion 12 of the lever 12 with the fixing lever 12 to attach the inner pipe 6 onto the shutter valve C,
A bypass passage E is installed between connecting members A and A'.
Next, in FIG. 3, when the shutter C of the gas communication member A on the left side in the figure is opened and the inner tube 6 is pushed down, the communication member made of an elastic body attached to the tip of the gas communication member A is opened. 1 is inserted into the gas pipe B. In this state, gas entering from the gas communication hole 2 flows through the bypass passage E as indicated by the arrow in the figure, reaches the communication member 1 made of an elastic body on the gas communication member A' side, and passes through the gas communication hole there. 2 into the outer tube 10 and flows out from the gas purge hole 8. Due to this outflow, the air in the bypass passage E is completely purged together with the gas. On the other hand, the gas that has entered the outer tube 10 from the gas purge groove 4 on the communication member A side flows through the gas purge hole 8 as indicated by the arrow in the figure, and the air in the outer tube 10 is completely discharged together with the gas. This state is the state shown in FIG. In the state shown in FIG. 3, gas is flowing through the gas pipe B, and there is no problem with the gas supply. Next, in FIG. 4, the shutter valve C on the communication member A' side is opened to create the same state as on the communication member A side. In this state, not only gas pipe B but also
Gas also flows through the bypass passage E, so that it is in a full flow state. In this state, both connecting members A,
When the tightening member 7 of A' is rotated, the tightening member 7 and the threaded portion 9 are screwed together, so that the tightening member 7 and the engaging portion 5 are engaged and the inner tube 6 is pushed. The pushing motion is continued until the communicating member 1 at the tip deforms and blocks the gas. In this way, since the tightening member 7 is rotated but the inner tube 6 is not rotated, the opening 3 is also not rotated, that is, its opening position does not change. However,
Gas flows from the gas communication hole 2 to the gas communication hole 2 on the communication member A' side, and does not flow to the specific location D. That is, the gas flows only through the bypass passage E and does not flow into the gas pipe B. Such a state is the state shown in FIG. In this state, the construction work is carried out by cutting at specific locations D, etc. After the construction is completed, tighten the tightening member 7 and shutter valve C.
and gas purge hole 8, etc., that is, perform the operations opposite to those described above, and finally connect the connecting members A,
A' is removed, a plug is attached to the shutter valve C, and the perforation is closed. After that, the bypass passage E, the shutter valve C and the pedestal 11 are removed to complete the work.

In this case, what is particularly important is to purge the air in the new pipe attached to the specific location D. As shown in Fig. 6, by opening the gas purge hole 8 on the side of the connecting member A' and loosening the tightening member 7 on the side of the connecting member A, the pressure of the elastic body 1 is softened, and the gas The gas also flows to a specific point D, and then passes through the gas purge groove 4 of the communication member 1 made of an elastic body on the side of the communication member A', flows out from the gas purge hole 8, and purges the air in the pipe. Therefore, air no longer exists in the specific location.

(Effects of the Invention) As described above, the present invention makes it possible to easily install and remove a bypass passage by using a uniquely configured communication member, and at the same time, it is possible to easily remove air from each of the most important parts together with gas. The biggest advantage is that it can be purged. By doing so, we believe that the conventional work of installing pedestals and shutter valves in four locations, two on the left and right, and inflating and deflating rubber balloons while ensuring safety, can be simplified at once. At the same time, since no rubber balloons are used, there is a great advantage of ensuring maximum safety.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the connecting member, Figures 2 to 6
The figure is an explanatory diagram showing the working state. Reference numeral 1... Communication member made of an elastic body, 2... Gas communication hole, 3... Opening, 4... Gas purge groove,
5... Engaging portion, 6... Inner pipe, 7... Tightening member, 8
... Gas purge hole, 9 ... Threaded part, 10 ... Outer tube, 11 ... Pedestal, 12 ... Fixing lever, 13
...Flange portion, A...Gas communication member, B...Gas pipe, C...Shutter valve, D...Specific location such as construction, E...Bypass passage.

Claims (1)

[Claims] 1. A gas communication hole is provided in the longitudinal center of the communication member made of an elastic material, an opening is provided in the radial direction of the gas communication hole, and a gas purge groove is provided in the longitudinal direction at the back of the opening. A communicating member having such a structure is attached to the tip of an inner tube having an engaging portion at the upper portion, and the inner tube is placed inside an outer fixing tube having a gas purge hole, a threaded portion, and a flange portion at the lower portion. A connecting member for construction work such as a gas conduit pipe, which is inserted into the inner pipe and is provided with a tightening member that engages with the engaging portion at the upper part of the inner pipe.