JPH0616214Y2 - Temporary flange lid for pipeline - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention temporarily suspends the construction of pipelines,
The present invention relates to a temporary flange lid that can be safely and easily removed when a temporary flange lid is attached to a pipe end and, after backfilling, the construction is restarted and a steel pipeline is connected.

[Prior Art] In the construction work of a large diameter steel pipe,
The temporary flange cover is attached to the pipe end, and after backfilling once, the temporary flange cover is removed when the construction is restarted and the steel pipeline is connected. There are two types of temporary flange lids. One is a welding temporary flange lid 21. FIG. 6 shows the situation in which the temporary welding flange lid is attached. The entire end surface of the pipe is covered with a thick steel plate 21 and welded along the entire circumference of the steel pipe. After backfilling once, when restarting the work and connecting the steel pipes, the pipe body on the side surface of the steel pipe is melted. In this case, the welded surface should be groove processed before the steel pipe laying work is continued. The other one is a hexa plug. FIG. 8 shows the situation in which the hexa plug is attached to the end surface of the pipe. Hexaplug has a holding plate 31 and a blind plate 3
Two thick circular plates made of thick steel plate are connected to each other by a rubber ring having a diameter slightly smaller than the inner diameter of the pipe. The diameter of the pressing plate 31 is slightly larger than the outer diameter of the pipe. The work to attach the hexa-plug to the pipe end surface is first a blind plate 32.
Is inserted into the inner diameter of the tube, and the pressing plate 31 is pressed until it contacts the entire surface of the tube end surface. After that, the thumbscrew nut 33 attached to the pressing plate 31 is tightened. The blind plate 32 is pulled toward the pressing plate 31 by the thumbscrew nut operation 33. By this operation, a force that expands the rubber ring 34 in the outer peripheral direction acts, and the rubber ring 34 strongly adheres to the inner surface of the pipe,
Prevents the intrusion of water and sand from outside the pipe. After backfilling once, when restarting the construction and connecting the steel pipeline, the wing screw nut 33
Loosen. When the thumbscrew nut 33 is loosened, the rubber ring 34, which was in close contact with the inner surface of the pipe, contracts and the hexa plug can be removed from the end of the pipe, and the steel pipe laying work is continued.

[Problems to be solved by the invention] However, when the welding temporary flange lid 21 is used, when the work is temporarily interrupted and the work is restarted later to connect the steel pipes, the pipe body on the side surface of the steel pipe is removed. At the time of fusing, the flammable gas is often filled inside the steel pipe, and there is a danger that the flammable gas explodes with a fusing flame. Also, when using the hexa plug, it is difficult to handle because the hexa plug is heavy when the construction is temporarily stopped. The present invention has been made in view of such circumstances, and an object thereof is to provide a temporary flange lid that is light and capable of safe work without danger of explosive flammable gas exploding.

[Means for Solving Problems] A temporary flange lid for a steel pipeline according to the present invention is a temporary flange lid for laying a buried pipeline that temporarily suspends the construction and temporarily closes the pipeline end when backfilling. In the flange lid, a disc having a plurality of openings whose diameter is equal to or larger than the outer diameter of the end of the conduit, a plate-like body that closes the opening, and a bolt that joins the plate-like body and the disc. , A rubber packing interposed on a joint surface between the plate-shaped body and the disc.

[Operation] According to the temporary flange lid of the present invention as described above, the construction is temporarily suspended in the construction work of a large-diameter steel pipeline, the temporary flange lid is attached to the pipe end, and the construction is resumed after backfilling once. When connecting the steel pipeline, loosen the bolts that tighten the plate-shaped body before melting the temporary flange cover and remove it, and then use natural ventilation or forced ventilation to discharge the flammable gas from the pipe and then melt the temporary flange cover. Therefore, there is no danger of flammable gas exploding in the pipe.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1 to 3 show an embodiment according to the present invention. The temporary flange cover 2 of the steel pipe line is attached to the pipe end in advance when temporarily suspending the work in laying the large-diameter steel pipe 1 and once backfilling, restarting the work, and extending the steel pipe to the steel pipe. Removed when connecting to the road. The steel disc 6 of the temporary flange lid 2 has two openings, and the openings are closed by the plate-like bodies 7 and 8. Such a steel disc 6 is attached to the steel pipe 1 by welding, as shown in FIG. The structure of the opening of the steel disk 6 is such that a rim plate 10 called a cylindrical couming is welded around the opening of the steel disk 6, and a flange 11 is welded to an end surface of the edging plate 10 called this couming. It is what The plate-like bodies 7 and 8 for closing the opening and the flange 11 have an airtight structure by being tightened by the bolts and nuts 9 via the rubber packing 12, so that water, earth and sand, etc. are prevented from entering the pipe. I'm out. After backfilling once, when resuming the construction, the bolts and nuts 9 are loosened and removed to remove the plate-like bodies 7 and 8 that close the opening from the flange 11 and open the opening. Before fusing 2, the flammable gas is discharged from the pipe by natural ventilation or forced ventilation through these two openings. After that, the temporary flange lid 2 is melted and cut, so that there is no danger of the flammable gas in the pipe exploding.

The shape and number of openings of the steel disk 6 and the plate-shaped body 7
The materials of 8 and 8 are not limited to those in the above embodiment, but can be appropriately changed to those having the same effect.

[Effects of the Invention] The provisional flange lid of the present invention includes a disk having a plurality of openings, a plate-like body that closes the openings, a bolt that joins the plate-like body and the disk, and the plate. Since it is composed of a rubber packing that intervenes on the joint surface of the circular plate and the circular plate, the work is temporarily interrupted during the construction work of a large-diameter steel pipe, and a temporary flange lid is welded to the pipe end, and then backfilled once. Later, when the construction is restarted and the steel pipe is connected, the flammable gas filling the inside of the steel pipe can be replaced, so the flammable gas filling the inside of the steel pipe melts when the construction resumes. There is no danger of exploding with the flame of.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a situation immediately before a temporary flange lid is attached to a pipe end in an embodiment of the present invention and the earth and sand are backfilled, and FIG. 2 is a front view showing a temporary flange lid in the same embodiment of the present invention. 3 is a partially enlarged sectional view showing a state in which a temporary flange lid is attached to a pipe end in the embodiment of the present invention, and FIG. 4 is a side view showing a state in which a conventional welding temporary flange lid is attached, 5 to 6 are a front view and a sectional view showing a state in which the hexa plug is attached to the end surface of the pipe. 1 ... Steel pipe, 2 ... Temporary flange lid, 3 ... Sheet pile, 4 ... Sediment, 5
... Road surface, 6 ... Steel disk, 7,8 ... Plate, 9 ... Bolt
Nuts, 10 ... Koming, 11 ... Flange, 12 ... Rubber packing.

Claims (1)

[Scope of utility model registration request] 1. A temporary flange lid that temporarily interrupts the work in laying a buried pipeline and closes the pipeline end when backfilling, and has a plurality of diameters equal to or larger than the outer diameter of the pipeline end. A disc having an opening, and a plate-like body closing the opening,
A temporary flange lid for a pipeline, comprising a bolt for joining the plate and the disc, and a rubber packing interposed on a joint surface between the plate and the disc.