JP5187684B2 - Pipe lining tool - Google Patents

Description

  The present invention relates to an in-pipe lining tool used for painting 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 example, as disclosed in Patent Document 1, a lining tool using a spherical pig having a smaller diameter than the pipe diameter is used for the lining process.
In this lining tool, a tow rope with a pig interposed between the pipes filled with paint is passed over the upstream and downstream ends of the pipe, and the air flow generated in the pipe increases the air flow around the pig. In this state, the sphere is moved from the upstream side to the downstream side in the pipe, so that the paint is blown off to form a paint layer on the inner peripheral wall of the pipe.
Therefore, in the above lining tool, high speed air current is generated around the pig by covering the flange with the traction rope inserted into the center of the upstream and downstream ends of the pipe and holding the pig in the center of the pipe. The gap between the inner wall of the pipe and the outer periphery of the pig is kept constant, and the paint is applied by the high-speed air current generated around the pig moving in the pipe by pulling the towing rope in such a state. It is made to spray on the inner peripheral wall of the pipe.
Japanese Examined Patent Publication No. 1-4668 (Fig. 5)

However, it is not easy to hang a tow rope having a pig interposed in the pipe after the paint is put into the pipe from one end to the other end.
For this reason, it is possible to eliminate the tow rope in front of the pig (downstream side) and move the pig in the pipe with the air flow generated in the pipe. However, since the pig is spherical, good propulsive force can be obtained. However, the pig does not move smoothly, and there is a risk that the pig will stagnate in the middle of a relatively long pipe, so that the paint layer cannot be uniformly formed on the inner peripheral wall of the pipe over the entire desired pipe length. have.

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 and is adjusted while feeding resistance to the suction force of the suction device. The paint spraying assisting device is a pipe made of a rigid material. A hollow sphere having a diameter smaller than the diameter is formed, and a connecting portion with the wire is provided at one pole portion of the hollow sphere, and a plurality of openings communicating inward with the connecting portion as a center are provided. The airflow flowing in from the opening is received in the hollow sphere and moved to the downstream side in the pipe, and the paint is sprayed to the entire circumference of the pipe by the airflow that blows through the gap formed between the hollow sphere and the inner peripheral wall of the pipe to the downstream side in the pipe. Nachiko The features.
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. It consists of a wire that is connected to an attachment aid and that is fed out while applying resistance to the suction force of the suction device, and the paint spraying aid forms a hollow sphere smaller in diameter than the pipe diameter with a rigid material. In addition, a connecting portion with the wire is provided at one pole portion of the hollow sphere, and a plurality of openings communicating inward with the connecting portion as a center are provided. The paint spray assisting device can obtain a sufficient driving force for moving in the pipe by receiving the airflow flowing in from the opening inside the hollow sphere, so that it smoothly moves from the upstream end to the downstream end of the pipe. it can.
Therefore, the paint is sprayed to the entire circumference in the pipe on the downstream side in front of the hollow sphere by the high-speed airflow that blows through the gap formed between the hollow sphere and the pipe inner peripheral wall in the paint spraying aid, and the lower side of the horizontal pipe. The paint accumulated in the pipe is also blown up by the high-speed airflow passing through the gap and blown to the entire inner wall of the pipe. The paint sprayed in this way is extended by being pushed forward by the high-speed airflow, and the paint surface is smoothed. It adheres uniformly with a sufficient thickness, and the smoothening and uniform thickness of the entire inner peripheral wall of the pipe is ensured by continuously extending the paint and smoothing the paint surface by the progress of the hollow spheres in the pipe. A paint layer having a uniform thickness can be formed uniformly.

The wire is connected to the paint spraying assisting tool via the turning back tool, so that the paint spraying assisting tool is swung in the pipe and the rotation shaft is held at the center of the paint spraying assisting tool (hollow sphere). Therefore, the paint spraying aid can be moved while being positioned at the center of the pipe, so that the paint can be sprayed evenly on the pipe inner peripheral wall along the high-speed air current injected from the gap between the hollow sphere and the pipe inner peripheral wall. It is possible to form the coating layer applied to the layer with a more uniform thickness.
Furthermore, since the hollow sphere moves while rotating to maintain the center in the pipe as described above even when the pipe shape is winding, the shape of the hollow sphere is also difficult to be caught in the pipe, and smooth and speedy. It can be passed through and the working efficiency can be improved.

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 airflow swirling from upstream to downstream is generated by the suction force of the suction device B, and the coating material L is introduced in advance from the upstream end PU of the pipe P in this pipe environment.

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 to 5, the paint spraying assisting tool 1 forms a hollow sphere 1 a having a diameter smaller than the pipe diameter from a material having rigidity such as light metal or hard plastic, and one end portion of the hollow sphere 1 a. In addition to providing the connecting portion 3 with the wire 2, a plurality of circular openings 4 communicating inwardly with the connecting portion 3 as the center are provided.
The connecting portion 3 is a ring portion of an eyelet bar 3a formed by bending one end of a bar material into a ring shape, and the other end of the eyelet bar 3a is passed through a through hole provided in one pole portion of the hollow sphere 1a to be hollow. The other end of the eyelet bar 3a, the counter electrode part in the hollow sphere 1a, the root of the ring part (connecting part) 3, and the periphery of the through hole are fixed to each other, in contact with the counter electrode part in the sphere 1a.

The paint spraying assisting tool 1 detachably connects the connecting portion 3 and the loop 2a provided at the tip of the wire 2 via the connecting ring 5 (see FIG. 6) or the connecting ring 5 connected to the connecting portion 3. And the loop 2a are detachably connected via a turn-back tool 6 (see FIG. 7).
The connecting ring 5 is formed in a substantially C shape, and is provided with a lock nut 5a that is slidably attached to one end portion thereof and screwed to the other end portion, and is connected to the other end portion of the lock nut 5a. The connecting ring 5 is opened and closed by attaching and detaching, and the loop 2a and the connecting portion 3 are inserted.
The turning back tool 6 is formed by providing a pair of shackles 6a that are coaxially rotatable with each other. The shackle 6a is divided into a bifurcated shape via a concave groove 6b on the cylindrical tip side and is connected to the loop 2a. A threaded pin 6c is inserted through the ring 5 and hooked in each concave groove 6b. The threaded pin 6c is detachably attached to the end of the shackle 6a.
In the illustrated example, the turning back tool 6 is connected to the connecting portion 3 via the connecting ring 5, but may be directly connected to the connecting portion 3.

When the paint spraying assisting tool 1 is introduced into the pipe P that has been made negative pressure by the suction device B, the air current flows from the upstream to the downstream generated in the pipe, so that the air current flows through the openings 4 of the hollow sphere 1a. By flowing into the interior and receiving an air flow in the interior, a sufficient propulsive force for moving in the tube is obtained and the tube moves downstream in the tube (see FIGS. 6 and 7).
Since the hollow sphere 1a is set to have a diameter smaller than the inner diameter of the pipe, a gap G is formed between the inner peripheral wall of the pipe and the airflow is blown to the downstream side of the pipe, and the paint previously introduced into the pipe by the airflow blowing through the gap G L is blown around the entire circumference of the pipe.

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 introduced into the inside of the opening and the drainage branch TP) from the PU, and lining is applied for each painting route as described later.
As the hollow sphere 1a, one having an appropriate diameter according to the diameter of the pipe P to be introduced is appropriately selected and used.

Below, the lining construction of the piping P in one coating route is explained in full detail.
After the paint L is appropriately supplied from the upstream end PU of the pipe P, the paint spraying aid 1 is continuously supplied from the upstream end PU.
When the paint spraying aid 1 is inserted into the pipe P, the airflow generated by the suction force of the suction device B flows into the hollow sphere 1a through the opening 4 as described above and moves downstream. .
Further, the movement of the paint spraying assisting tool 1 (hollow sphere 1a) is adjusted while feeding resistance while applying resistance to the suction force of the suction device B so as to gradually move 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 movement state of the paint spraying assisting tool 1 that changes depending on the state of the pipe is transmitted from the wire 2. Then, the paint spraying assisting tool 1 is moved by feeding the wire 2 a predetermined length or sometimes pulling it.

Since the gap G is always generated between the peripheral wall and the hollow sphere 1a in the pipe P, the airflow that blows through the gap G to the downstream side in the pipe is increased in speed, and this high-speed airflow causes the downstream side in front of the hollow sphere 1a. The coating material L is sprayed to the entire circumference of the pipe, and the coating material L sprayed in this way is stretched by being pushed forward by a high-speed air flow, and the surface of the coating material L is smoothed and uniformly adhered with a sufficient thickness. The coating layer L1 having a smooth and uniform thickness is surely formed on the entire inner peripheral wall of the pipe by continuously extending the smooth coating L and smoothing the surface of the coating L by the progress of the hollow sphere 1a in the pipe. (See FIGS. 6 and 7).
Moreover, since the hollow sphere 1a is smaller than the pipe diameter and moves by receiving the airflow inside as described above, the hollow sphere 1a is almost floated in the pipe P, and is in the downstream side in the pipe with almost no contact with the pipe inner peripheral wall. Therefore, even if the pipe line is winding, the pipe P is bent smoothly by the suction of the suction device B according to the pipe shape, and the wire 2 is also flexible due to its flexibility. However, the coating layer L1 having an appropriate thickness can be formed in the same manner as described above for any pipe shape because it follows the hollow sphere 1a following the bending.
Therefore, in the horizontal pipe SP, even if the paint L is accumulated on the lower side, the paint L can be blown up and sprayed on the entire inner peripheral wall of the pipe by the high-speed air current generated in the gap G by the passage of the hollow sphere 1a. 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 by the suction force, so that the paint spraying aid 1 is put into the pipe P. When it is done, it tends to rotate in the pipe.
Therefore, by connecting the wire 2 and the paint spraying aid 1 via the turning back tool 6, the paint spraying aid 1 (hollow sphere 1a) can be actively rotated.
As a result, the paint spraying assisting tool 1 rotates within the pipe so as to hold the rotation shaft at the center of the hollow sphere 1a, so that the paint spraying assisting tool 1 (hollow sphere 1a) is positioned more in the center of the pipe. The paint L is evenly sprayed onto the inner peripheral wall of the pipe along the high-speed airflow that is moved and sprayed from the gap G between the hollow sphere 1a and the inner peripheral wall of the pipe, so that the paint layer L1 applied to the inner peripheral wall of the pipe can be formed more evenly. In addition, since the hollow sphere 1a moves while rotating so as to always maintain the center in the pipe as described above even if the shape in the pipe is winding, the shape of the hollow sphere 1a is difficult to be caught in the pipe P together with the shape of the hollow sphere 1a. Smooth and pass through.

When the paint spraying assisting tool 1 reaches the downstream end PL of the pipe P, the suction device B is stopped, the connecting ring 5 or the turning back tool 6 is removed from the loop 2a at the tip of the wire 2, and the wire 2 The connection with the paint spraying aid 1 is released, the hollow sphere 1a 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 a paint spraying aid. It is a top view same as the above. It is a left side view same as the above. It is XX sectional drawing of FIG. 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 YY sectional drawing of FIG. It is ZZ sectional drawing of FIG.

Explanation of symbols

1 Paint spray aid
1a hollow sphere 2 wire 3 connecting part 4 opening 6 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 introduced after the paint is introduced from the upstream end of the pipe, and is connected to the paint spraying aid. The paint spray assisting device forms a hollow sphere having a diameter smaller than the pipe diameter with a rigid material, and the hollow sphere is formed of a rigid material while applying resistance to the suction force of the suction device. A connecting portion with the wire is provided at one pole portion, and a plurality of openings that communicate inwardly with the connecting portion as a center are provided. A pipe lining tool characterized by receiving and moving to the downstream side in the pipe, and spraying paint on the entire circumference of the pipe by an airflow that blows through the gap formed between the hollow sphere and the pipe inner peripheral wall to the downstream side in the pipe.   The in-pipe lining tool according to claim 1, wherein the wire is connected to the paint spraying assisting tool through a turning back tool.

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