JPS6037486A - Method of construction of quick burying joint of undergroundburied steel 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 A conventional method of constructing a joint for a conventional underground steel pipe will be described with reference to FIGS. 1 to 5. Diagram M1 is a schematic diagram of the state immediately before installation on site using the conventional construction method.

Figure 2 is a view along the P-F arrow in Figure 1, Figure 3 is a schematic diagram of the state shown in Figure 1 when it is pulled in the direction of the → mark, and Figure 4 is a cross section of section G in Figure 3. Detailed view of Figure 5.
A detailed view of the section H in the figure is shown. Normally, water pipes are often buried by excavating roads, but welding and painting on-site joints takes a long time, resulting in a lot of waiting time during on-site construction, which increases costs. To solve this problem, V
Although the construction method shown in FIGS. 1 to 5 has been developed and widely used, there are various problems with this construction method.

1. Zuko's method will be explained. ol is the pipe body that is about to be installed, 01° is the pipe body that has already been installed, 02 is the upper semicircular backing metal attached to one side of the pipe body mouth 1 that is about to be installed, and 06 is the backing metal. Lower half circumference true guard installed opposite to 02, 02-1, 02-
2 is the seal welded part at the site, and 02-3 is the fillet welded part when the pipe body 01 is attached to the backing metal 02 at the factory.

06-1 is the fillet welded part when installing the pipe body 01° and backing metal 05 at all factories, 04ij gasket stopper, 04
-1 is the fillet welded part when the pipe body 01 and gasket stopper 04 are attached at the factory.

05 is a gasket), 06 is a gasket) 05i Vinyl-coated wire for tightening, 071d Rag piece for temporary construction, 07
-1 is the pipe body 01101' When installing all lug pieces 07 at the factory, temporary attachment is the fillet weld, 08 is lug piece 0
7. Tightening is the on-site butt welding of the bolt/nut + o9'h tube body 01 and tube body 01'. The construction order is as follows: First, the pipe body 01゛ is set in the specified position, and as shown in Figs. and tighten. The gasket 05 is pre-tightened on the road surface.After the bolt and nut 08 are tightened, the seal welded portion 02-1. Complete welding of o2-2 and repair painting of that part! Once this is completed, the work on the outside of the pipe will be completed, and the dried money from the exterior painting will be used to backfill with earth and sand. Repeat this process to move forward. Tighten the inner surface of the tube, but tighten bolts and nuts 08 later.

Welding of butt weld part 09 is immediately started.

The work will proceed independently of the backfilling work. When the butt weld part 09 is all completed, remove all bolts and nuts 08 for tightening the lug piece 07°, and tighten this part and the butt weld part 0.
The inner surface work will be completed if the repair coating v is applied to the painted surface around 9.

The problem with this method is that as shown in the previous drawing, a gasket is provided on the upper half of the wing, so no external work is required, but seal welding on the upper half of the circumference and subsequent repair painting are required, which takes some time. In addition, when butt welding is performed on a tube body whose inner surface is empty, the painted surface of the outer surface of the backing metal is burned, and the anticorrosion effect is significantly reduced. 0
10 is the outer surface of the tube.

011ij shows the inner surface of the tube.

The present invention was invented with the aim of eliminating the above-mentioned disadvantages.

In the present invention, by tightening the lug piece with bolts and nuts, the externally attached gasket is tightened, completely preventing the infiltration of underground water, and by butt welding the pipe bodies, the gasket is tightly tightened, eliminating any joining work from the outside of the pipe. 9. Concerning a rapid burial joint construction method for underground steel pipes, which is characterized by the following. The aim is to provide a quick-build joint method for underground steel pipes that requires almost no external work and does not cause damage to the painted surface due to the effects of welding heat.It can be applied to on-site construction of each pipeline, and can be used in the event of rain. It is also possible to construct
It can also be used when laying inside tunnels (even when it is impossible to work on the outside of the pipe).

An embodiment of the rapid burial joint construction method for underground steel pipes of the present invention will be described with reference to FIGS. 6 to N8.

Fig. 6 is a schematic diagram of the piping sequence of an embodiment of the rapid burial joint construction method for underground steel pipes of the present invention, Fig. 7 is a detailed view of the section B in Fig. 6, and Fig. 8 is A in Fig. 6. - Shows a view in the direction of the A arrow. 1' is the tube that was set earlier.

1 indicates the tube body that will be set later, and 1-1 indicates the tube body 1° that will be set first and the tube body 1 that will be set later.
2 is a liner;
-1 and 2-2 are fillet welds that are attached to the pipe body 1 and liner 2 at all factories.

5 is the outer tube, 3-1 is the fillet weld where the liner 2 and the outer tube 5 are attached at the factory, 4 is the gasket push ring, 3-2 and 4
-1 is a fillet weld where the outer tube 3 and push ring 4 are attached at the factory, 5 is a fillet weld where the gasket strap 5-1u tube body 1'' and gasket stopper 5 are attached at the factory, and 6 is 7 is a grout plug, 8 is a lug piece, 9 is a bolt nut, and 10 is a space between the tube body 1 and the outer tube 3.

Reference numeral 11 indicates the outer surface of the tube, and 12 indicates the inner surface of the tube.

The operation of the present invention will be explained. The order of setting at the site is to pull the pipe body 1 in the direction of the pipe body 1' and tighten the lug piece 8't with the bolt nut 9, thereby tightening the gasket 6 between the gasket push ring 4 and the gasket stopper 50, and preventing external groundwater etc. from leaving the space. This prevents intrusion into the direction of 10, making it possible to backfill with external earth and sand. Since the welding of the butt weld portion 1-1 can be performed regardless of external work, very quick burial work is possible. Removal of lug piece 8 #bolt nut 9 is at butt weld part 1-1
The work can be completed by repairing the paint around the butt weld part 1-1 after welding. Further, if it is necessary to fill the entire space 10 with mortar etc. according to the user's request, a grout plug 7 is provided in advance at the factory, and the work is carried out from the inner surface of the tube after welding of the butt weld section 1-1 is completed.

The present invention has the above configuration and has the following secondary effects.

(1) By tightening the lug piece 8 with the bolt/nut 9, the gasket 6 is tightened between the gasket push ring 4 and the gasket stopper 5, thereby preventing intrusion of external groundwater, etc.

(2) Due to the above action, the air in the space 10 is completely cut off from the outside by Vcm, so there is no need to repaint the outer surface of the pipe after welding. Construction is possible even when there are water droplets due to rain or underground water.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the state immediately before setting on site using the conventional construction method, Figure 2 is a view from the FF arrow in Figure 1, and Figure 3 is a schematic diagram of the state immediately before being set on site using the conventional construction method. A schematic diagram of the state, Fig. 4 is a detailed view of the G5Fr surface in Fig. 5, Fig. 5 is a detailed view of the H section in Fig. 6, and Fig. 6 is the rapid burial joint construction method for underground steel pipes of the present invention. FIG. 7 is a detailed cross-sectional view of section B in FIG. 6, FIG.
A view taken along arrow AA in the figure is shown. 01...The main body of the pipe that will be installed from now on, oll...
...The pipe body already installed, 02...The upper semicircular backing plate attached to one side of the pipe main body 01, 03.
...Backing metal 0 on the lower half of the circumference installed opposite to 02
2-1.02-2...Seal welded area on site. 02-3...Fillet weld W part of tube body Or and backing metal 03, 04...Gasket stopper, 04-1
...Fillet weld between the tube body 01 and the gasket stopper 04, 05...Gasket), 06...
...Coated wire, 07...Lag piece, 07-
1...Temporarily attach the lug piece o7 to the tube body 01,01'' at the fillet weld, 08...Bolt hole), 09...Tube body 01 and o i' Field welded part, 010... pipe outer surface, 011...
Tube inner surface, 1°...Pipe body set earlier, 1.
...Pipe body 1-1 to be set later...
Field welded part between tube body 1° and 1, 2... liner,
2-1.2-2...Fillet weld between tube body 1 and liner 2, 3...Outer tube, 5-1...Liner 2 and outside Fillet welded part between cylindrical pipe 3, 4... Gasket push ring, 5-2.4-1... Fillet welded part between outer cylindrical pipe 3 and push ring 4, 5. ... Gasket neck, 5-1 ... Fillet welded part of tube body 1° and gasket stopper 5, 6 ... Gasket, 7.
...Grout plug, 8...Lag piece, 9
... Bolt nut, 10 ... Space between tube body 1 and outer tube 3. 11...Tube outer surface, 12...Tube inner surface. Patent applicant Mitsubishi Heavy Industries, Ltd.

Claims (1)

[Claims] By tightening all the lug pieces with bolts and nuts, the externally attached gasket is tightened, completely preventing infiltration of underground water, and by butt welding the pipe bodies, the gasket is tightly tightened, eliminating any joining work from the outside of the pipe. Rapid underground joint construction method for underground steel pipes O