JPH06126230A - Existing pipe lining equipment - Google Patents

Abstract

(57) [Summary] [Purpose] A simple jig is provided at the time of lining by vacuum suction to provide functions of suction amount adjustment and pig stop, improve lining performance, etc., and facilitate pig reuse. [Structure] A resin filling device 20 is connected to one end of the repair pipe 5 to fill the lining resin together with the lining pig 12, and then a resin feeding device 25 is connected, and the water impregnating pigs 13, 14 are connected by utilizing water pressure. The lining resin is sent to a predetermined location by using the above. After that, the resin pullback device 30 is further connected to one end of the repair pipe 5, and in this case, a pig stop jig 35 that also serves as a suction amount adjustment is attached to the tip of the resin receiver 33, and the vacuum pump 31 is operated. At the beginning of the lining, a high vacuum force acts on the inside of the repair pipe 5 to easily pull back the lining resin and the like, and thereafter, the suction amount is limited by the water blocking pigs 13 and 14 and the jig 35, and the lining pig 12 stabilizes the suction. The lining pig 12 and the jig 35 shut off the repair pipe 5 in a suction state to complete the lining.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining apparatus for forming a coating of a lining resin on the inner surface of a repair pipe and repairing it in an existing pipe such as a gas pipe or a water pipe buried underground. The present invention relates to a means for adjusting a suction amount at the time of lining in a suction lining method and for fixing a pig.

[0002]

2. Description of the Related Art If existing pipes such as gas pipes buried underground are used for many years, they may corrode and cause gas leaks. Therefore, a resin lining method is known as a method for rehabilitating repair pipes that need repair under underground conditions. In this lining method, a plug of semi-liquid lining resin is transferred inside the repair pipe at a predetermined speed, at which time the resin is adhered to the inner surface of the pipe to form a film with a predetermined film thickness to protect it from corrosion. is there.

The lining method in this case includes a pressure lining method and a suction lining method. In the pressure lining method, the repair pipe is separated from the main pipe and both ends are opened, and the lining resin is pneumatically transferred from one end of the repair pipe to the other end to maintain a constant lining speed inside the pipe. The air pressure is controlled to line the film to a uniform thickness. With the suction lining method, the lining resin is first sent to one of the repair points from only one end while the repair pipe is connected to the main pipe, and then the resin is pulled back using vacuum suction, using a lining pig at this time. The lining is made to have a uniform film thickness. Each of these two construction methods has advantages and disadvantages, but the suction lining construction method is particularly advantageous in that it is possible to work from only one end of the repair pipe in a non-excavated and live pipe state.

In view of the above, there has been a prior art relating to the above-mentioned suction lining method, for example, in Japanese Patent Laid-Open No. 4-114773. Here, first, the lining material is pressure-fed from one end of the repair pipe with the leading pig at the front, and then the hose, the resin receiver, and the suction pump are connected to the one end of the repair pipe by vacuum suction to guide the leading pig and the lining material. Pull back and line. Further, it is shown that the excess lining material and the pig are collected by the resin receiver at the end of the lining.

[0005]

However, the above-mentioned prior art has the following problems because it does not have a function of adjusting the suction amount during vacuum suction. That is, the lining resin requires a high vacuum force at the initial stage of the lining, so that the lining speed becomes slow and the film thickness becomes thin. Once the lining resin starts moving, it can be transferred even with a relatively low vacuum force, and the amount of resin decreases as the lining progresses, so the lining speed increases and the film thickness increases, thus making the film thickness non-uniform. become.

At the end of the lining, the internal pressure of the pipe suddenly changes from a vacuum of, for example, -1.0 Kg / cm ² to a gas pressure of the supply gas of, for example, 0.02 Kg / cm ² , which causes a blow-through state. The surface is disturbed. Further, at the end of this lining, the suction pump sucks the supply gas or the like of the repair pipe, and therefore the pump itself is required to have an explosion-proof performance. Also, since it does not have a pig stop function, the used pig or the like falls into the resin of the resin receiver, which complicates taking out and cleaning at the time of reuse.

The present invention has been made in view of this point, and a simple jig is provided at the time of lining by vacuum suction to provide functions of suction amount adjustment and pig stop to improve lining performance and the like. The purpose is to facilitate reuse.

[0008]

In order to achieve the above object, the present invention provides a device for arranging a lining pig and a water-blocking pig before and after a lining resin, and feeding the lining resin to a predetermined position of a repair pipe by utilizing water pressure. , A vacuum pump, a lining resin having a resin receiver inside the repair pipe, and a resin pull-back device for forming a film of a predetermined film thickness on the inner surface of the repair pipe by vacuum suction of each pig. In a lining device for existing piping that is selectively connected to one end of a repair pipe to perform lining work, the suction amount of each pig is adjusted by the suction closing action of each pig at the tip of the resin receiver of the resin pullback device, and the pig is stopped. A jig for shutting off is attached.

[0009]

In the lining process after the lining resin is sent to the predetermined portion of the repair pipe based on the above configuration, the resin pulling-back device is connected to one end of the repair pipe so that the repair pipe has a suction amount adjustment function. The fixture, the resin receiver, and the vacuum pump are connected in this order. So when you activate the vacuum pump,
Initially, a high vacuum force is applied to the inside of the repair pipe to easily pull back the lining resin, etc., and then the impermeable pig is sucked by the jig to limit the suction amount. While being gently pulled back, it is lined well by the lining pig, and the lining pig enters the jig to complete the lining. At the end of this lining, the repair pipe is not blocked in the suction state to cause pressure fluctuation, and the supply gas of the repair pipe in the active pipe state is prevented from being sucked by the vacuum pump.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, an embodiment in which resin is fed by utilizing water pressure by a suction lining method will be described. Reference numeral 1 is a main pipe such as a gas pipe buried in the soil D at a predetermined depth, and a supply pipe 3 is branched and connected to the main pipe 1 via a service channel 2. The supply pipe 3 extends to a demand destination and is connected to a meter stand pipe 4 at an end of the supply pipe 3 so as to project to the ground. Normally, a stand meter etc. is attached to the stand pipe 4 to pipe the gas. It is possible to use.

Therefore, when such a gas pipe is used for many years, the supply pipe 3 and the standing pipe 4 after the service station 2 serve as repair pipes 5 and are repaired by applying the suction lining method. During this repair, the repair pipe 5 is connected to the main pipe 1 and only the vertical pipe 4 at one end of the repair pipe 5 is opened without removing the meter or the like. Then, the connection pipe 11 of the lining device 10 is attached to the opening of the standing pipe 4, and various devices are selectively connected to perform the work of each process.

The lining device 10 is roughly provided with a resin filling device 20, a resin feeding device 25 utilizing water pressure, and a resin pulling device 30 utilizing vacuum suction.
Further, since this type of repair pipe 5 is relatively short and is lined to the entire length of the repair pipe 5 in one operation, the length of the repair pipe 5 is measured in advance before construction. Then, the required amount of resin is calculated based on the length, pipe diameter, film thickness, etc. of the repair pipe 5, and the amount of water required to send the lining resin A having this amount of resin to the vicinity of the service station 2 is calculated.

The resin filling device 20 has a press-fitting machine 21 for accommodating the above-mentioned predetermined amount of the lining resin A. The press-fitting machine 21 is connected to the connecting pipe 11 by a hose 22 and is press-fitted in the resin filling step. The machine 21 is operated so that the repair pipe 5 is filled with the resin A with the lining pig 12 at the head.

The resin feeding device 25 is provided with a scale and the like, and a water injection tank 26 for accommodating the above-mentioned predetermined amount of water W therein.
The water injection tank 26 is configured to be connected to the connection pipe 11 via the water supply pump 27 and the hose 28.
Then, in the resin feeding step, the resin A of the repair pipe 5 is brought into contact with the two water blocking pigs 13, 14 and the water absorbing material 15 between them, and the pump 27 is operated to exert a water pressure.

In the resin pull-back device 30, a resin receiver 33 is connected to the suction side of a vacuum pump 31 by a hose 32, and a pig stop jig 35 also serving as a suction amount adjustment is attached to the tip of the resin receiver 33. It is configured to connect the tool 35 to the connecting pipe 11. Then, in the lining step, the vacuum pump 31 is operated to remove the water W, the water blocking pigs 13 and 14, and the like, and the resin A of the repair pipe 5 and the lining pig 12 are pulled back.

Referring to the exploded perspective view of FIG. 2A and the sectional view of FIG. 2B, the pig stop jig 35 that also serves to adjust the suction amount will be described. It has a cylindrical jig body 36. The jig body 36 is provided with three holes 37 to 39 penetrating in the axial direction, and two holes 37 and 38 are formed with recesses 37a and 38a which are fitted and closed by the water-impermeable pigs 13 and 14, respectively. The hole 39 is formed with a recess 39a which is fitted and closed by the lining pig 12. In addition, transparent bowl-shaped cases 40 and 41 are provided on the front and rear of the jig main body 36 with screw portions 42.
Is detachably screwed. Then, the inlet 40a of the case 40 is connected to the connecting pipe 11, and the outlet 41a of the case 41 is connected to the hose 3 from the resin receiver 33 by the metal fitting 43.
Connect to 2.

Here, the inner diameter of the repair pipe 5 is, for example, 27.6 m.
In case of m, the outer diameter of the lining pig 12 is 23 mm
Then, the film thickness is set to 2.3 mm. Further, the water blocking pigs 13 and 14 are closely fitted to the repair pipe 5 to block water, and therefore have an outer diameter of 32 mm, for example. On the other hand, at the time of lining, the first heavy impermeable pig 1
3, 14 are initially sucked and fall inside the one case 40, and the relatively light lining pig 12 enters the inside of the case 40 at the end of the lining. Therefore, the holes 37 and 38 are arranged in the lower part of the jig main body 36, and the hole 39 is arranged in the upper part thereof so that they can be automatically closed by the respective pigs 12 to 14.

Since only the hole 39 is opened during the lining, and the suction amount and the lining speed are determined by this hole 39, the diameter of this hole 39 is set to, for example, 13 mm, and the suction amount is adjusted by the orifice effect. Restrict. Other holes 3
The diameters of 7, 38 are set so that a high vacuum force can be secured in the initial stage of the lining, and thus have the function of adjusting and blocking the suction amount and the function of stopping the pig.

Next, the work for repairing the repair pipe 5 by this suction lining method will be described. First, in a supply pipe 3 and a repair pipe 5 of a standpipe 4 of a certain customer, a meter or the like is removed from the standpipe 4 at one end, and the length or the like is measured by using, for example, a sound wave, and the required resin amount and water amount are obtained. Etc. are calculated.
Then, the connecting pipe 11 is connected to the repair pipe 5, and as the first resin filling step, the press-fitting machine 21 of the resin filling device 20 is connected to the connecting pipe 11 as shown in FIG. 3 (a). In this way, the repair pipe 5 in the active pipe state can be subjected to the non-excavation lining method using the standing pipe 4. So, first put the lining pig 12 into the repair pipe 5,
Then, the press-fitting machine 21 is operated to inject and fill the repair pipe 5 with the calculated amount of the lining resin A.

Next, in the resin feeding step, as shown in FIG.
As shown in (b), the water supply pump 27 of the resin feeding device 25 and the water injection tank 26 are connected to the connection pipe 11 of the repair pipe 5 this time. Then, the water supply pump 2 with the two water blocking pigs 13 and 14 and the water absorbing material 15 arranged behind the resin A of the repair pipe 5
7 is operated to apply a high water pressure while sending a predetermined amount of water W from the water injection tank 26. Then, the water W leaks forward and the resin A is prevented from thickly adhering to the inner surface of the pipe by the two water blocking pigs 13 and 14, and the water W leaking to some extent
Is absorbed by the water-absorbing material 15, whereby a high water pressure is appropriately applied to the entire area of the cross section of the resin A. Therefore, this water pressure causes the lining resin A to be pushed and moved in the repair pipe 5 in a plug state and sequentially transferred forward. Then, when the resin A reaches just before the service Q 2, the water W in the water injection tank 26 is exhausted, and the resin feeding work is automatically finished.

In the subsequent lining process, as shown in FIG. 4, the connection pipe 11 of the repair pipe 5 is provided with a pig fixing jig 35 also serving as a suction amount adjustment of the resin pulling device 30, a resin receiver 33, and a vacuum pump 31 in this order. Then, the vacuum pump 31 is operated. Then, in the initial stage, the three holes 37 to
Since 39 is open, a high vacuum force is applied to the inside of the repair pipe 5 without pressure loss, and while the water W is collected in the resin receiver 33, the water blocking pigs 13, 14, the resin A, the lining pig 12
Can be easily sucked and pulled back. Then, the water-impermeable pigs 13, 14 and the water-absorbing material 15 are sucked by the jig 35 and fall at an early stage, and are fitted into the lower holes 37, 38 to be closed.

Therefore, after this, one hole 3 of the jig 35
The suction amount is limited by 9, so that the resin A is pulled back at a slow lining speed, and the lining pig 12 follows and moves behind this. Therefore, during the process of pulling back the resin A, the resin A is
The repair pipe 5 is sequentially adhered to the inner surface of the repair pipe 5 and consumed, and is properly lined so as to form the coating film B having a predetermined film thickness. When the entire length of the repair pipe 5 is lined, substantially the entire amount of the resin A is consumed, the lining pig 12 enters the jig 35 from the connecting pipe 11, and one hole 39 opened at this time is used.
And then close it. In this case, the state of the pig 12 is the jig 3
The vacuum pump 31 is visually observed by the transparent case 40 of FIG.
It can be understood from the fact that the overload is applied to the lining, and the lining is ended by stopping the vacuum pump 31 at this point.

At the end of this lining, the repair pipe 5 is blocked in the suction state by the lining pig 12 and the hole 39 of the jig 35, and the fluctuation of the in-cylinder pressure does not occur, thereby preventing the lining surface from being disturbed. Further, since the repair tube 5 in the active tube state and the vacuum pump 31 are automatically shut off, the supply gas C is not sucked into the vacuum pump 31. On the other hand, in the repair pipe 5 in the active pipe state, the lining is performed while keeping the gas blocked in all steps from the first resin filling to the end of the lining.

After completion of the lining, gas is supplied to spontaneously cure the lining resin, so that the repair pipe 5 is regenerated to have the coating B hardened in about 24 hours and protected against corrosion. After the jig 35 is removed from the connecting pipe 11, each of the pigs 12 to 14 is easily taken out and reused by separating the case 40 from the jig body 36 in the jig 35.

[0025]

As described above, according to the present invention, in the lining device for repairing the existing pipe by the suction lining method, the suction amount of the pigs is adjusted by the suction closing action of each pig in the resin pullback device used in the lining step. Since the jig is mounted, the lining speed is stabilized during the lining, and the coating film of the lining resin can be satisfactorily formed. Since this jig also has a function of blocking by blocking with a pig, at the end of the lining, the repair pipe is blocked in the suction state, so that the lining surface can be prevented from being disturbed, thereby further improving the lining performance. At this time, the gas in the repair tube will not be sucked into the vacuum pump,
The explosion-proof performance of the vacuum pump is no longer required, and safety is improved.

Since the jig is constructed so as to suck and close a plurality of holes by each pig by utilizing the suction of the lining pig and the water-blocking pig with a time delay, the structure is simplified. Further, since it has a plurality of functions of suction amount adjustment and pig stop, the device is downsized. Further, since all the pigs and the like are captured by this jig, the pigs and the like can be easily reused.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an existing pipe lining device according to the present invention.

FIG. 2 is an exploded perspective view and a sectional view showing the structure of a jig.

FIG. 3 is a diagram showing respective work states of a resin filling step and a resin feeding step.

FIG. 4 is a diagram showing a working state of a lining process.

[Explanation of symbols]

 5 Repair Pipe 10 Lining Device 12 Lining Pig 13, 14 Water Impermeable Pig 20 Resin Filling Device 25 Resin Feeding Device 30 Resin Retracting Device 31 Vacuum Pump 33 Resin Receptor 35 Pig Fixing Jig that also serves as suction amount adjustment

Claims (2)

[Claims] 1. A lining pig and a water-blocking pig are arranged in front of and behind the lining resin, and a device for feeding to a predetermined portion of the repair pipe by utilizing water pressure, a vacuum pump, and a resin receiver are provided inside the repair pipe. Equipped with a lining resin and a resin pullback device that forms a film of a predetermined thickness on the inner surface of the repair pipe by vacuum suction of each pig, and lining work by selectively connecting each of these devices to one end of the repair pipe In the existing pipe lining device to be installed, a jig for adjusting the suction amount by the suction closing action of each pig and mounting a jig for blocking and shutting the pig is attached to the tip of the resin receiving device of the resin pullback device. Lining device. 2. The jig is detachably attached to the case before and after the jig body, and the jig body is provided with holes to be closed by a lining pig and a water-blocking pig, respectively. The lining device for an existing pipe according to claim 1, wherein the lining device is set so as to limit the suction amount.