JP2009254946A - Pipe lining construction tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely form a smooth coating layer having an equal thickness on the entire in-pipe peripheral wall. <P>SOLUTION: The pipe lining construction tool comprises: a coating material blowing helper 1 to be charged successively after turning the inside of a pipe P to a negative pressure by a suction device connected to the downstream end part of the pipe P and charging a coating material L from the upstream end part of the pipe P; and wires 2 and 3 connected to the coating material blowing helper 1, delivered and adjusted while imparting resistance to the suction force of the suction device. The coating material blowing helper 1 comprises an air bag 1 freely deformable to be expanded and contracted and provided in the cross direction with sections in a triangular shape in the side view having an opening 5 inclined downward from a binding part 4 where four corners of a square-shaped sheet are bound into one and connected to the wires 2 and 3. It is expanded and deformed into a square spindle shape whose vertex is the binding part 4 and is moved to the downstream side inside the pipe by receiving an air current flowing in from the opening 5 in the inside by the charge into the pipe, and the coating material L is blown to the entire periphery inside the pipe by the air current blowing through a gap G generated between the peripheral edge 1a in a rectangular shape and the in-pipe peripheral wall to the downstream side inside the pipe. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an in-pipe lining tool used for coating a pipe such as a drain pipe or a water supply pipe already installed in an apartment, an office building or the like.

Conventionally, taking a drain pipe as an example of the above pipes, organic substances, oils and fats gradually adhere and accumulate due to their use over time, and the inside becomes constricted, and if left as it is, deposition proceeds. Even the part that was able to pass water that was left in the pipe was completely clogged, or the pipe itself was corroded, and due to the progress of corrosion, the pipe was perforated and leaked. A lining process has been performed in which a deposit is peeled and removed, and then a paint is applied to the inner peripheral wall of the pipe to form a paint layer having an appropriate thickness.
For the lining process, for example, as disclosed in Patent Document 1, a lining tool in which a parachute bag is connected to a wire is used.
In this lining tool, the bag body is placed in contact with the paint supplied to one end of the pipe, and when the suction pressure is applied in the pipe, the bag body draws a wire and spreads the paint on the inner peripheral wall of the pipe. However, it is painted by moving in the pipe.
And since the said bag body can be expanded and contracted, even if piping is twisted or the diameter changes in the middle, it can move favorably in the pipe, so it is necessary to prepare a bag body of a size corresponding to each diameter. The work efficiency can be improved.
JP 2004-141843 A

However, since the bag body spreads radially so that the bag body closes the inside of the pipe due to the suction pressure generated in the pipe, the paint between the bag body and the pipe peripheral wall spreads thinly, and the paint layer is There is a risk that sufficient thickness cannot be obtained.
Also, especially in horizontal pipes, the paint tends to accumulate with increasing thickness on the lower side, so even if the bag spreads as described above, the lower paint cannot be pushed upward evenly, for example in the pipe. Even if the bag body rotates in the pipe due to the suction pressure acting, the paint existing between the bag body and the pipe peripheral wall is viscous and resists the rotation of the bag body. Since it does not rotate once in the same part, the paint layer painted in the horizontal pipe has a problem that the thickness is not uniform.

In view of the above-described problems, the lining tool of the present invention is a paint blower that is continuously introduced after negative pressure is applied to the inside of a pipe by a suction device connected to the downstream end of the pipe, and paint is introduced from the upstream end of the pipe. A coating aid, and a wire that is connected to the paint spraying assisting device to adjust the suction force of the suction device while adjusting resistance. The paint spraying assisting device has four corners of a square sheet. Consists of an inflatable and deformable airbag having a triangular-shaped tuft in a cruciform direction having an opening inclined downward from a constriction connected to the wire in a bundle, and flows into the opening by in-pipe insertion By receiving the air flow inside, it bulges and deforms into a quadrangular pyramid shape with the constricted portion as the apex and moves to the downstream side in the pipe, and the gap formed between the rectangular peripheral edge and the government inner peripheral wall moves to the downstream side in the pipe The airflow that blows through It is characterized in that form as spraying the paint I tube to the entire circumference.
Further, the wire is connected to the paint spraying assisting tool through a turning back tool.

In short, the present invention provides a paint spraying assisting tool that is continuously introduced after negative pressure is applied to the inside of the pipe by the suction device connected to the downstream end of the pipe and the paint is introduced from the upstream end of the pipe, and the paint spraying aid. The paint spraying assisting tool is connected to the wire with the four corners of the square sheet bundled together in one bundle. Since the air bag is inflated and deformable and has a triangular tuft having a downwardly inclined opening from the constricted portion in the cross direction, the air bag flows from the opening when the air bag is inserted into the tube. By receiving the airflow to the inside, it bulges and deforms into a quadrangular pyramid shape with the constricted part corresponding to the pipe diameter as the apex, and moves to the downstream side in the pipe while being held in a form that does not adhere to the inner wall of the pipe .
As a result, a gap is always generated between the rectangular peripheral edge of the airbag at the time of deformation and the government inner peripheral wall during movement in the pipe, and the airflow that blows through the gap to the downstream side in the pipe is accelerated. Paint is sprayed to the entire inner circumference of the pipe on the downstream side in front of the air bag, and the paint accumulated on the lower side of the horizontal pipe is also blown up by the high-speed airflow passing through the gap and sprayed to the entire inner wall of the pipe. The applied paint is stretched by being pushed by a high-speed air stream, and the paint surface is smoothed and uniformly adhered with a sufficient thickness. Such stretching of paint and smoothing of the paint surface are caused by the air bag in the pipe. By being continuously formed by the progress, a coating layer having a smooth and uniform thickness can be reliably formed on the entire inner peripheral wall of the pipe.
Moreover, since the airbag can be inflated and deformed according to the tube diameter, even if the tube diameter changes during the movement of the airbag in the tube or the pipe is twisted, the suction of the suction device corresponds to the shape of the pipe The pipe is smoothly guided to the downstream in the pipe, and even if the pipe has a bent portion due to its flexibility, the pipe follows the bend and follows the air bag. Can form a coating layer having an appropriate thickness in the same manner as described above.

The wire is connected to the paint spraying assisting tool through the turning back tool, so that the air bag is swung in the pipe and the rotation shaft is held at the center of the air bag. The paint can be sprayed evenly on the inner wall of the pipe along the high-speed air current injected from the gap between the air bag and the inner wall of the pipe, and the paint layer applied to the inner wall of the pipe can be formed more evenly. it can.
Furthermore, even if the shape of the pipe is winding, the airbag always moves while rotating so as to maintain the center of the pipe as described above. Its practical effects such as being able to pass through speedily and improving work efficiency are enormous.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows an example of a drainage pipe having an arbitrary level in a high-rise apartment or the like. A horizontal branch pipe SP extending in the left-right direction is branched for each level from a drain main pipe MP passing through each level, and the horizontal branch pipe SP is branched. Divides the drainage branch TP connected to the drainage outlet of each water place (kitchen, washroom, etc.), and constitutes a series of drainage paths from the drainage outlet to the drainage main pipe MP.
In the lining in the piping (drainage main pipe MP, laterally extending branch pipe SP, drainage branch pipe TP) P, the lining is applied after removing the adhesion and deposits on the inner peripheral wall of the pipe P in advance.

For lining construction, a suction device B is connected to a downstream end PL of a pipe (drainage main pipe MP in the illustrated example) P via a pressure hose, and the upstream end of the pipe P (drainage main pipe MP is operated by the operation of the suction device B. The upper end opening of the pipe or the drain of the drainage branch pipe TP) sucks the air from the PU and makes the pipe P negative pressure.
In the pipe P, an air flow swirling from the upstream to the downstream is generated by the suction force of the suction device B, and in this pipe environment, from the upstream end of the pipe P (the drain outlet of the drainage branch TP in the illustrated example) PU. The paint L is introduced in advance.

The coating material L is obtained by kneading an epoxy resin-based coating material, a fine aggregate, and a viscosity modifier at an appropriate mixing ratio.
The fine aggregate is a scaly glass powder, has acid resistance in itself, and has a barrier function when the glass powder is disposed on the surface of the paint layer L1 applied in the pipe P. It is possible to extend the life of the layer L1, prevent cracks and improve chemical resistance.
The viscosity modifier is made of, for example, activated silica, and has an effect of reinforcing the paint layer L1 at the same time as adjusting the viscosity and thixotropy of the paint L depending on the mixing ratio.

  The pipe lining tool according to the present invention (hereinafter simply referred to as a lining tool) is continuously fed after the coating material L is put into the pipe P that has been made negative pressure by the suction device B as described above. It is wound around a reel (not shown) so that the paint spraying assisting tool 1 and the paint spraying assisting tool 1 are detachably connected to the paint spraying assisting tool 1 so as to adjust the feeding while applying resistance to the suction force of the suction device B. Wire 2.

  As shown in FIGS. 2 and 3, the paint spraying assisting device 1 forms a square sheet with a synthetic resin such as polyvinyl, polyester or polyethylene, or other non-breathable and flexible material. Then, the four corners of the sheet are bundled together and inserted into the caulking tube together with the proximal end of the short connecting wire 3 having the loop 3a formed at the tip, and the caulking tube is crimped to form the constricted portion 4. Accordingly, the air bag is formed of an inflatable and deformable airbag (hereinafter referred to as an airbag 1) having a triangular-shaped tuft 6 having an opening 5 inclined downward from the narrowed portion 4 in a cross direction.

In the air bag 1, the loop 3a of the connecting wire 3 protruding from the binding portion 4 and the loop 2a provided at the tip of the wire 2 are detachably connected via a connecting ring 7 (see FIG. 5) or the loop 2a. , 3a are detachably connected via a turn-back tool 8 (see FIG. 6).
The connecting ring 7 is formed in a substantially C shape, and is provided with a lock nut 7a that is slidably mounted at one end portion thereof and screwed to the other end portion, and is connected to the other end portion of the lock nut 7a. The connecting ring 7 is opened and closed by attaching and detaching, and the loops 2a and 3a are inserted.
As shown in FIG. 4, the turning back tool 8 is provided with a pair of shackles 8a that are coaxially rotatable with each other, and the shackles 8a are bifurcated via a concave groove 8b at the end of the columnar shape. A threaded pin 8c, which is formed in a divided manner and is inserted through the loops 2a and 3a and hooked in the respective recessed grooves 8b, is detachably mounted transversely at the end of the shackle 8a.
When the airbag 1 is introduced into the pipe P that has been negatively pressured by the suction device B, the airflow flows into the inside through the openings 5 due to the airflow that flows in the pipe from the upstream to the downstream. 4 expands into a quadrangular pyramid shape, that is, each tuft 6 bulges, and thereby each opening 5 is narrowed into a substantially linear shape, and its peripheral edge 5a is deformed into an elongated fin. The upper part including the shape is deformed into a quadrangular pyramid having the linearized opening 5 as a ridge line, and the lower part of the opening 5 is deformed into a dome shape, and in this state, the airflow moves to the downstream side in the pipe (see FIG. 4-6).

The airbag 1 basically bulges and deforms into a quadrangular pyramid shape as described above, but the deformation follows the tube diameter.
That is, the inflated airbag 1 shown in FIG. 4 shows a state in a large-diameter pipe (hereinafter referred to as a large-diameter pipe), but a small-diameter pipe (hereinafter referred to as a small-diameter pipe). In FIG. 4, since the wind pressure is higher than that of the large-diameter tube and a strong suction force is applied, the fin width of the fin-shaped opening peripheral edge 5a of each tuft 6 in FIG. (See FIG. 1).
In any case, the airbag 1 inflated and deformed in the pipe can generate a gap G between the square peripheral edge 1a and the pipe inner peripheral wall in the quadrangular pyramid-like deformed form, and the airflow blows out downstream in the pipe.
Then, the paint L previously introduced into the pipe is blown over the entire circumference of the pipe by the airflow that blows through the gap G.

In the present lining method using the lining tool having the above-described configuration, the upstream end portion of the pipe P (the upper end of the drain main pipe MP) according to the coating route determined according to the pipe P in the state where the suction device B is operated. The paint L is put into the inside of the opening or drainage branch TP) from the PU.
After the paint L is charged, the airbag 1 is continuously charged from the upstream end PU.

When the airbag 1 is introduced into the pipe P, it is inflated and deformed into a quadrangular pyramid shape corresponding to the pipe diameter as described above by the suction force of the suction device B and the airflow generated thereby, and is pulled downstream.
Since the airbag 1 is basically deformed into a quadrangular pyramid shape as described above regardless of the diameter of the tube, the airbag 1 moves to the downstream side in the tube without being in close contact with the inner wall of the tube.
Further, the movement of the air bag 1 is adjusted while applying resistance to the suction force of the suction device B so that the air bag 1 gradually moves according to the feeding length of the wire 2.
Note that the feeding adjustment of the wire 2 is performed by an operator in the vicinity of the upstream end PU of the pipe P, and the operator feels that the moving state of the air bag 1 is changed from the wire 2 depending on the situation in the pipe. The air bag 1 is moved by feeding it out for a predetermined length or sometimes pulling it.

In the pipe P, there is always a gap G between the peripheral wall and the rectangular peripheral edge 1a of the airbag 1. Therefore, the airflow blown through the gap G to the downstream side in the pipe is increased in speed, and the high-speed airflow causes the airbag to flow. 1. The coating material L is sprayed to the entire inner circumference of the pipe on the downstream side of the front, and the coating material L sprayed in this way is stretched by being pushed forward by a high-speed air flow, the surface of the coating material L is smoothed, and uniform with sufficient thickness. The paint L has a smooth and even thickness on the entire inner peripheral wall of the pipe by continuously extending the paint L and smoothing the surface of the paint L by the progress of the air bag 1 in the pipe. Layer L1 is formed (see FIGS. 5 and 6).
In addition, since the airbag 1 can be swelled and deformed in accordance with the tube diameter, even if the tube diameter changes during the movement of the airbag 1 in the tube or the pipe is twisted, the suction device corresponds to the shape of the pipe. B is smoothly guided downstream in the pipe by the suction of B, and the wires 2 and 3 are also flexible so that even if the pipe P has a bent portion, it follows the airbag 1 following the bent. The coating layer L1 having an appropriate thickness can be formed in the same manner as described above for any pipe shape.
Therefore, in the horizontal pipe SP, even if the paint L is accumulated on the lower side thereof, the paint L can be blown up and sprayed on the entire inner peripheral wall of the pipe by the high-speed air flow generated in the gap G by the passage of the airbag 1. Similarly, the paint layer L1 having a smooth and uniform thickness can be reliably formed on the entire inner peripheral wall of the pipe.

Further, when the pressure in the pipe P is reduced by the operation of the suction device B, an air flow swirling toward the downstream is generated in the pipe P due to the suction force, so that the airbag 1 is thrown into the pipe P. , Tend to rotate in the tube.
Therefore, the airbag 1 can be actively rotated by connecting the wire 2 and the airbag 1 via the turnback tool 8.
As a result, the airbag 1 rotates within the pipe so as to hold its rotating shaft at the center of the airbag 1, so that the airbag 1 can be moved while being positioned at the center of the inside of the pipe. The coating L can be sprayed evenly on the inner peripheral wall of the pipe along the high-speed air current sprayed from the gap G, and the coating layer L1 applied to the inner peripheral wall of the pipe can be formed with a more uniform thickness. As described above, since the airbag 1 always moves while rotating so as to maintain the center in the pipe, it is difficult to get caught in the pipe P due to the flexibility of the airbag 1, and the pipe 1 can be passed smoothly and speedily. .

Then, when the airbag 1 reaches the downstream end PL of the pipe P, the suction device B is stopped, the connecting ring 7 or the turn-back tool 8 is removed from the loop 2a at the tip of the wire 2, and the wire 2 and the airbag 1 are removed. The air bag 1 is recovered at the downstream end PL, and the wire 2 is pulled back to the upstream end PU for recovery.
The surplus paint that has been blown off by the airflow and does not adhere to the inner wall of the pipe is stored in the storage tank of the suction device B through the pressure hose.
Thereafter, the inside of the pipe P is visually confirmed with an endoscope, and it is confirmed that the paint layer L1 is formed on the entire inner peripheral wall of the pipe P, and then a hot air blower (not shown) is connected to the pressure hose. Hot air from the air blower is passed through the pipe P to dry and cure the paint layer L1.

It is a simplified sectional view showing an example of a drainage pipe line to be lined. It is a front view of the state before use of a paint spraying aid. It is a top view same as the above. It is a perspective view which shows the expansion deformation state of a paint spraying assistance tool. It is piping sectional drawing which shows a coating layer formation process. It is piping sectional drawing which shows the other example of a coating layer formation process. It is XX sectional drawing of FIG.

Explanation of symbols

1 Paint spraying aid (airbag)
2, 3 Wire 4 Constriction part 5 Opening part 6 Bunch 8 Turning back tool B Suction device G Gap L Paint P Piping
PL downstream end
PU upstream end

Claims (2)

  A suction device connected to the downstream end of the pipe creates a negative pressure in the pipe and connects the paint spraying aid that is continuously applied after the paint is introduced from the upstream end of the pipe, and is connected to the paint spraying aid. The paint spraying assisting tool is formed from a constricted portion connected to the wire with the four corners of the square sheet being bundled in one bundle while providing resistance to the suction force of the suction device. It consists of an inflatable and deformable air bag having a triangularly shaped tuft having a downwardly inclined opening in the cross direction, and receiving the airflow flowing in from the opening when it is inserted into the tube, thereby making the constricted part a vertex It is formed to bulge and deform into a quadrangular pyramid and move to the downstream side in the pipe, and to spray paint on the entire circumference of the pipe by the airflow that blows through the gap between the rectangular peripheral edge and the inner wall of the government. Octopus Pipe lining device according to claim.   The in-pipe lining tool according to claim 1, wherein the wire is connected to the paint spraying aid through a turning back tool.

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