JPS5962375A - Method for sealing and preventing corrosion of laid fluid pipe - Google Patents

Abstract

PURPOSE:To improve the adhesion of a sealant and a covering material and to perform repairing at a low cost, by sealing the leaking part of a laid fluid pipe with an adhesive material which foams in the stage of gelling and covering the sealed part and the inside wall of the pipe with a durable corrosion-preventive material. CONSTITUTION:Two pigs 3 which are elastic spherical bodies having the diameter equal to the diameter of a laid pipe 1 are inserted into the pipe from one end thereof. A material which has good adhesions and generates closed cells or a swelling property in the stage of gelling is filled in a liquid state between the pigs 3 and an air pressure or the like is applied in an arrow 7 direction thereto. The pigs 3 are thus moved forcibly and a leaking hole 17 is sealed with the liquid material. A durable corrosion-preventive coating material such as an epoxy resin or the like is transferred by using pigs 3 of slightly smaller diameter by a similar method upon completion of the gelling to apply a lining on the sealed part, the inside wall of the pipe and the joint part, whereby a coating layer is formed. The sealing and corrosion prevention in the pipe are thus accomplished by a simple method.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for sealing and preventing corrosion of installed fluid conduits, and more particularly, the present invention relates to a method for sealing and preventing corrosion of installed fluid conduits, and more particularly, the present invention relates to a method of sealing and preventing corrosion of installed fluid conduits, and more particularly, a foamable material or an expanding all material that has an adhesive property of 1lif+ and generates closed cells when gelled. (in liquid form) 111 leaching from the leakage part 1-J: The sea urchin is filled with FF force, and then gelled to form a durable anti-corrosive coating that has good adhesion to the sealing part, pipe wall part, and joint part. This is one of the most important ways to apply and coat materials.

First, the blue color to which the present invention was applied will be explained.

In the urban area, there are countless underground water pipes, caskets, electric cables, and shielded signal pipes, while trains using direct current power run across the area.

The DC electricity consumed by the train returns to the substation using the track as a conductor.
A phenomenon (stray current) occurs in which the current passes through the earth as a shortcut, transfers to a buried pipe along that path, and then flows underground again in an attempt to take a shortcut.

Electrical corrosion occurs where this direct current escapes to the ground, and corrosion progresses rapidly, creating holes in the ground in a short period of time.

(In addition to that) Is there any groundwater in the land near Kakubata? /11
Water is mixed in, and iron pipes are easily corroded chemically.
Because it costs a lot more money to replace a new pipe than to install a new one, it has recently become mandatory to use resin-treated buried pipes from the time of installation. .

But'r [next h! Even if pipes are replaced with new pipes in certain areas one after another, there is a risk that leaks from gas pipes may cause minor explosions. It becomes necessary to apply a coating and maintain the tube until it is replaced with a new tube.

Leakage from water pipes is a sudden disaster (the fluid pressure inside the water pipe is compared to the gas pressure), and the outflow h1 is caused by capillary action and the action of pushing away sediment ?, ([
How to repair the sky/J<strongly desired.

Previously, some experiments were conducted with t) on the back side of 1.
The methods that came to be implemented include the following:

Figure 1 shows a leakage 81 of a water-type 100φ rusted iron pipe 1, in which two bullets 14 and a sphere 3 (called a big) whose diameter is the inside diameter of the pipe are sealed from one side, and between the two. Water pipe rehabilitation lining material and l no l' rtJ version - C 2: l/i + i 1 - ■ Boxy type lining (A!'
Don't hold 5! Ta.

(and move in the lj direction of arrow 7 to 0.2・0,5 kg/
This is an experimental example in which sealing was performed by adding cm2 of air and moving it through the pipe. I streamed ETF 13 to Zonoado] -7 was included in the moon.

There was no change in the experimental connection compared to before the repair, 3 (') Om
Even in the water column juice aeration test, there was no leakage.

Figure 1 shows an experimental example of a straight pipe.
Then, connect them with 44 "Rubo-15)" in the middle, and add a leak hole 17 in the horizontal pipe part in advance.
It was almost a month ago that I took a break from using the experimental equipment and attempted an experiment.

This second experimental example uses Pig 3 to transfer 80φ steel.
Om water\17I;- placed, I-, 40c in 1 fat gt
10 holes of 55-.
/cm2) and forced pressure was applied to the sealing material.

The anti-corrosion lining material used was a commercially available IL bottle and used as a water pipe rehabilitation lining material.1. Viscosity 1α30, 000 CP
S.

1 fat 1 usage time 60 minutes, ll! 1! degree shore D 90
13 In this experiment, oil and air simultaneously pushed up the soil embankment and blew it up from the 10 leak holes 17 installed in advance. Of the 5 leak holes 17 that were sealed, there were only half of the holes (31 seals)'2.

3rd disappearance 1910L Fig. 1 (shown here ii') Actual tube of tube (''ir <,'j: 2 Using the same experimental equipment as in the experimental example) 11 eyes between two big 3 4" 1 water pipe J cow epoxy 151 fat fall 1? + Shite 0, 5
k! +, / This is an attempt at air n-r lining for can2, and the pipe is an 80φ steel pipe, with a leak hole 17 pre-installed.
(Total of 5~20φ holes M-+ 20 pieces, 1 b
, 0OOCPS and J in the case of the second experimental example, a flexible one was used.

In this third experiment, the pig 3 stopped moving at the leak hole 17 that had been prepared in advance, so the air pressure was increased to 11 (7 cm2) and forced lining was performed until the end.

After 224 hours, we removed the earth embankment and inspected the seal condition, and found that 5 of the 20 leak holes that had been prepared in advance were complete.
gI part was incompletely sealed with half sealed, the rest was hardly sealed, and the lining resin hardened in the soil, leaving holes; -1-For the W-shaped curved pipe using Report-155, thread the leading wire made of 4-inch wire from the preceding Big 3 through the pulling wire A-y-19. Place C backward moving pig 3 on the right side of the experimental equipment*: 111 (
21C winding machine
<JmetaichiL).

This experiment was conducted using a towing Y A7-19 j! I gap resistance force Tenjin Saku ``Neupano's strong IQ is too difficult C゛Experimenting''■υUnavoidable f?-)I, :Ka, Promising method in the case of straight pipes I thought I was four years old.

The method of using an automatic self-propelled q-mounted head in the J1 leak sealing method of the lζ fluid guidance described above, and the method of using an automatic self-propelled
- Even though it can be considered as 76, it is not suitable for curved pipes because it is 1 - high and small diameter pipes are not suitable for curved pipes. After a detailed and parsimonious synthesis of the results of the four experimental examples described above, we arrived at the following conclusions.

(1) Conventional water pipe rehabilitation training programs available on the market can only provide a complete 2-i seal.

That is, Ruj: Lining shrine (31 goes into the soil) by making a leakage hole 'X, even after passing through the big, pores are formed because 1.5 air per force passes through. This is thought to be due to gelation at J, J:, where the pores are opened, due to the aggregation η111 of the body periphery occurring in the gluing 11h, such as q2, where gelation is promoted.

(2) Pull the two pipes with a wide V- and line the middle lining (Δ without spouting from the leak hole) method (can be carried out on a single curved pipe).

It seems like the right thing to do because the air blows out after the 15 pig passes, but it is not practical because the friction resistance of the warp 17- is large at the curved part.

Therefore, in the present invention, the seal 4A seals the leakage hole, and gelation 11.1 is performed using a material that "foams 1" or a material with increased swelling property, and VIG is used for pipes other than straight pipes. This is a method of squirting from a leak hole.
Next, after the gelation of the sealing material is completed, the gelled sealing part, the inner wall of the conduit, and the adhesive 1 part 1 of the silk are bonded with fI using the same method.
For example, general/J-2m with iii durable corrosion protection 14
No. 1: J boxy system (17J method in which 111 fat is lined with 1174J) was carried out.

41'1 Preferred embodiments of the glue are provided based on the drawings.
I will explain in detail.

FIRST EMBODIMENT As shown in FIG.

Fill foam 11 shopping Δ12 (see attached table 1) between big 3 using air month 4 and compress? Toki fJ-0,5 niri/'cm
2 Table 1 Composition of 12 substances Q4 was moved from bamboo (blank below) - (Par-9W (left end) to the other end (right part; Result, 30
At 0 mm water column, the leakage is 0, 0, 11 (g/cm')
But the leakage Lj is zero.

There is no leakage even at 0.5 kg/Cm2-ci.
) 1゜ Then durable anti-corrosion formulation 1312 <Attachment 2
The lining was applied in the same way as the sealing method described in Reference 1jjj), and there was no leakage in the leakage test 1- with 3QQmm water+'' pressure.

Second Embodiment As shown in Figure 3, there is a
10 holes of 0φ were installed (U) buried in the soil with a thickness of 30 cm2, and from one side, two bullets 1 and 1 ball (Vig) 3 with the pipe diameter as the diameter were inserted. in the middle (3').

One part of the present invention is 41 times adhesion 1 (1 good and 11 times melting 1)
Add a substance that foams closed air; /cm2 was added.

/Jl < U Hif 3', r IF forward movement C!
L+i i! Seal lx hole 17 I, 2. In this case, the use of A I2 substance 111 is '1! ′)1<IJ(
Yes, Big 3 (,1 about 2 seconds (Ipa・iA: wandered to △12
1 Table 2 Composition and properties of B+2 substances (blank above) Quality surplus c, 1 approximately 0.5 kCI -).

After about 20 minutes (J gelation is completed 1), the two Big 3 used for the primary seal are more lenient.Use a smaller Vig with a V1 diameter and use the same method as the primary seal as shown in Figure 4. In addition, between the two parts, the seal part, the inner wall of the conduit, and the joint part (possible to have adhesive properties) are used.
Below V312 Trade in goods and Ifo are shown in Table 2.
Transfer with air pressure of 5 to 1.0 kg.
The lining was completed by taking it out to the right side of the figure.

(Seal condition after 3 hours, lining material is good for everyone!)/cm2 water resistance month~kari・de'b
8 + ii leakage is equal and 15 degrees J5 A I2 substance and 1312 material trade to 1 ("Tit△12 substance [゛'s rupture, and this time it is #I la'?" + power is i3, 5 ”・'
1, Okg/251nn1 width-("il Lily, Δ12 material v: 1 and 1312 material V (at which interface the resin is formed in good contact with r1 and the same).

Therefore, it is stable with 1 lil inner surface anti-intervention seal 7111; i long-term use) and 114 (i; I: 10 m of 80φ steel pipe). J in Fig. 3, sea urchin water 51i, ]5φ corrosion holes in 5 places,
A3 material (Table 3 (this Inject about 2 times (as shown) between two urethane bigs 3, and press the rightmost bigs at an air pressure of 0 and 5 kg/cm2:
TE fT - Send Shita.

The movement of this old big (1 to 2 seconds between 1 and 1, at the right end (
,1,Δ・(The material was discharged as approximately 8,000 excess materials.The time required for the primary seal was approximately 10 minutes from the A3 material injection to the completion of the VIG transfer.

Next, after about 40 minutes, the primary seal 1) is slightly smaller in diameter.
Using urethane big 3, the air pressure is 11 (g, -'
(: increased to II+ 2 and lining material 133
The coating (as shown in Table 4) was removed.

This video [certain person finished] in about 1.5 minutes, and 33 hours later, 4. water pressure y in garlic/cm2
), t・をt)−〉／Kokai! Ili leaked 4J: It was.

<-1 and the gas resistance of the three substances (the car after being immersed in gas [1i change proposal is +2% after being kept at 25°C for 11f) is inconsistent. 11 Table: Composition and special characteristics of the material (blank below) What is the adhesion property of the primary seal (A: + material 7'j)?
5 mm width has been obtained, so corrosion will be prevented for the next few years.
1- It is considered possible.

Fourth fruit IJ1! ! Example 4 The same experimental equipment as shown in Figs.
, 5 corrosion holes each of 17 and 20φ f) 8+ /I 0
llla setup 4: J, -1-mori V) 'a-5Q cmM
L/- (A4 material for the primary seal (see Table 5)
It took about 3 seconds for the 5° Big 3 to reach the right end, which was carried out by transferring 5 kg of material A4 at an air pressure of 0.6 kg/C1112. The culm was about 1 kg.

Approximately 60 minutes after the completion of the primary seal, inject lining material 84 (see Table 6) using the device shown in Figure 4.
kg/Cm2 of air month - C' vig moved 3°. In this case, the mass of substance B4 is about 7 to 1 IJ.

The lining material substance 134 is different 1!1. In this case, the primary sealing hole Δ, I material and the contact j-
1st! 3 Table A4 Composition of substances (1st I・”
Table 6: Composition of 84 substances and Machitake 1 (1 or b, which is excellent in fr).

2 /l 11: After checking the degree of sealing of the leakage hole 17 after the passage of time, /'IkIJ/C012 water pressure test found that there was no water leakage and the sealing and lining properties were good (・A-) Ta.

1-Corrected lJ tree invention embodiment C clearly <, < as shown, seal 4. d has grafting 1', I in the sol state,
Gelation 11, blasphemous independent air) (!) Since we use a substance that is resistant to light or a substance that has swelling properties, gelation will not occur even if there is an outflow hole for the pressurized air when filling the sealing material. In some cases, the IJ hole is completely sealed by volume expansion, which eliminates all the disadvantages of the conventional method.

Seal 4A base (Δ differs from conventional urethane seal 4Δ in that it shrinks after foaming) 1) It is a foamed or swelling material that does not have poor adhesion, and is stable over a long period of time. The characteristic is that it is +1.

J. List the names of substances in detail: urethane, acrylic, styrene, acrylic urethane, foam drying 1, 9 foam 1 (1 rubber, swelling 1 (1) synthetic rubber.

Swellable melamine, foamed melamine, etc. can be used.

A3 After sealing, a durable anti-corrosion coating that completely cures was used as a sealing material, and as a result, the seal was repaired over several years to prevent corrosion.9)J 3,

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating one of the conventional methods of sealing a leakage portion of a laid straight pipe. Figure 2 shows the Gino method for sealing the leakage part of a curved pipe.
An explanatory diagram of the method. Figure 3 is a side view of the experimental equipment used to invent and experiment with Kimanho. Fig. 4 shows an experimental apparatus for lining the same durable anti-corrosion coating. (The main parts of the drawing are shown in Table 4) 1...Cast iron pipe or tI4 pipe 3...Elastic sphere (big) 5)...Seal or lining 4A1 7・・・
・ Side 1 leak hole

Claims (2)

[Claims] (1) A material V that is oily and has adhesiveness and foams closed cells when it gels (or seals the leakage part of the fluid conductivity in advance with a substance that has swelling properties, and then gels it. !, : C for the seal part, inner wall of the conduit, and joint part
lh 4n 1! A durable anti-corrosion coating material is applied to cover the right side of the
l) Method of sealing and corrosion protection of laid fluid conduits with τ covered by YU > I. (2) Special N! In addition to the sealing and anticorrosion method described in box (1) of the request for J5, the material has a 5. T has a swelling substance and is stable over a long period of time. IJ method 1 for sealing and prevention 11 using synthetic rubber, swelling 111 melamine, foamed melamine, etc.