JPS621485A - Method of lining piping - Google Patents

Abstract

PURPOSE:To positively apply lining to the entire inner surface of a bent part in a uniform and sufficient thickness, by arranging a spiral body in the bent part of piping along the inner surface thereof and fluidizing a liquid lining material along the spiral body by the action of a gas stream. CONSTITUTION:A high speed gas stream is flowed in piping 1 by the actions of a blower 6 and an exhaust fan 12 while a proper amount of a liquid lining material is quantitatively and continuously supplied from a supply apparatus 10 and the liquid lining material 14 is spirally fluidized along the inner surface 1b of the piping 1 and a spiral body 8 by the action of the gas stream F. By this mechanism, the speed of the gas stream F decreases in the vicinity of the inner surface of a bent part 1a because the spiral body 8 functions as an obstacle and trouble such that the liquid lining material adhered to the inner surface of the bent part 1a is shaved off by the gas stream is eliminated and, as a result, the liquid lining material is uniformly applied to the entire inner surface of the bent part 1a in a sufficient thickness.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention supplies a liquid lining material and a gas for transporting the lining material into a pipe having a curved υ portion, and applies the liquid lining material to the inner surface of the pipe by the action of airflow. This invention relates to a piping lining method.

[Conventional technology]

Conventionally, gas-liquid multiphase flow of liquid lining material and conveying gas was
The liquid lining material was applied to the inner surface of the pipe by flowing it at such high speed as to form an annular flow (for example,
See Publication No. 263 A [Problem to be Solved by the Invention] However, at the curved portion, the gas flows biased toward the side of the inner surface with a larger radius of curvature, and the liquid lining material flows due to the internal pressure gradient caused by the gas drift. The flow is biased toward the side of the inner surface with a smaller radius of curvature, and therefore the lining layer on the inner surface of the curved part with a larger radius of curvature is thinner, which tends to cause lining defects and deterioration of durability, and there is room for further improvement. Ta.

An object of the present invention is to make it possible to line the entire inner surface of a piping die uniformly and with sufficient thickness.

[Means for solving problems]

The characteristic means of the present invention is that a spiral body is arranged inside the curved part along the inner surface thereof, and the liquid lining material is caused to flow in a spiral shape along the spiral body and the inner surface of the curved part by the action of airflow, Its effects are as follows.

[For production]

In other words, the velocity of the airflow near the inner surface of the curved portion is reduced because the spiral body becomes an obstacle, and the liquid lining material attached to the inner surface of the curved portion is not scraped off by the airflow, and therefore, it does not adhere to the inner surface of the curved portion. When the liquid lining material is conveyed by the air current, it flows in a spiral shape due to the guiding action of the spiral bodies, and flows in such a manner that it fills the spaces between the spiral bodies uniformly and with a sufficient thickness.

〔Effect of the invention〕

As a result, the entire inner surface of the piping surface can be reliably lined uniformly and with sufficient thickness, and the inner lining of curved piping can be lined with airflow conveyance technology in a highly reliable state and with excellent durability. Now it can be done in the state.

〔Example〕 Next, examples will be shown.

As shown in Fig. 1, the pipe il+ with the bent part (1a) by the elbow is cut and opened at an appropriate position commensurate with the repair area, and the wire (3) extending from the reel (2) is connected to the pipe il+. Insert a connected parachute-like or other appropriate towing device (4) into the pipe (1), attach the lid (6) with the wire (3) passed through it to the pipe f1), and attach the blower (6) to the lid ( 5) Connect to.

The traction tool (4) is moved by the air pressure from the blower (6), and the wire (3) is passed through the pipe +1), and the spiral body (8) extending from the reel (7) is moved as shown in Fig. 2. Pass through (3)
Connect to.

As shown in FIG. 8, while pulling the wire (3) with the traction device (9), a moderate braking force is applied to the reel (7),
After elastically stretching the spiral body (8) to make it small in diameter and pulling it into the pipe +11 in good condition, and drawing the spiral body (8) over the entire length of the pipe fi+, the reel (7) is rotated manually or by a drive device. Then, the spiral body (8) is fed into the pipe (1), and the spiral body (8) is expanded by elastic restoring force and brought into close contact with or close to the inner surface of the pipe [1].

After that, remove the lid (6) and connect the wire (31) to the spiral (8).
), and as shown in Figure 4, cut the spiral body (8) to match the length of the pipe (1), and remove the lid (5) connected to the blower (6) and liquid lining material supply device (lO). ) on one end side of the pipe (1), and a lining material recovery device (II
) and the lid (13) connected to the exhaust fan α4 are connected to the other end of the pipe fi+.

An appropriate amount of liquid lining material was continuously and quantitatively supplied from the supply bag &1 + υ to the pipe (1), which diverts high-speed airflow into the pipe (1) by the action of the blower (6) and exhaust fan α, as shown in Figure 5. 1. Liquid lining material H is applied to the inner surface of the pipe (
1b) and spirally along the spiral body (8).
To explain further, when a gas-liquid multiphase flow of liquid lining material and carrier gas is made to flow at a high speed that becomes an annular flow or at a slightly lower speed, the gas surrounding the finely divided liquid lining material flows through the center of the piping. The liquid lining material θ chrysanthemum flows at high speed and is sent spirally along the inner surface of the pipe (1b) and guided by the spiral body (8).

Further, the finely divided liquid inning material is collected in a collector (11) and only the gas is released.

After applying the liquid lining material H to an appropriate thickness by flowing it spirally over the entire inner surface of the pipe (1), the blower (
6) Stop the exhaust fan (12) and the supply device (lO), remove the lid t51, H from the pipe +1), and apply the liquid applied to the pipe t1+ by an appropriate means such as supplying hot air as necessary. The lining material (14) is solidified, and the piping (1
) to restore the connection.

[Another example]

Next, another embodiment will be described.

The target distribution V i1+ is for city gas, natural gas,
Although water supply pipes and other existing pipes are mainly used, various new pipes and other pipes may be used, and the pipe structure forming the bent portion (1a) of the pipe t1+ is not limited.

The liquid lining materials used are thermosetting type, room temperature curing type,
Any of various other known substances may be used, and the gas for transporting the liquid lining material may be air or any other suitable gas.

The spiral body (8) has the following characteristics in terms of material, shape, dimensions, etc.
Changes can be made as appropriate to suit the situation, and piping fl.
) The arrangement state can be changed appropriately, such as by disassembling and reassembling it locally at the bent part (1b) of the curved part (1b), or it may be embedded in the lining material after the lining treatment.
However, as shown in the example above, if the spiral body (8) made of an elastic material is deformed to a small diameter and inserted into the pipe (1), the work can be done easily and quickly, which is convenient. By arranging the spiral body (8) over almost the entire length of the pipe, the amount of gas for conveying the lining material can be reduced and the flow rate can be slowed, compared to the case where there is no spiral body (8) in the straight pipe section. The wind blower is small and inexpensive, requiring low power costs, and is advantageous in terms of economy and workability.

Circulating liquid lining material and conveying gas,
Insert the spiral body (8) while rotating it, or in the case of underground piping, use the above-ground part of the branch pipe to insert the spiral body (8).
Insertion of liquid lining material and conveying gas, supply and discharge of the liquid lining material, and other specific construction methods can be modified in various ways.

[Brief explanation of the drawing]

1 to 5 are conceptual diagrams showing embodiments of the present invention, respectively. +1)...Piping, (1m)...Bent part, (1b)...Piping inner surface, (8)...
Spiral, (141...Liquid lining material.

Claims (1)

[Scope of Claims] [1] A liquid lining material and a gas for transporting the lining material are supplied into the pipe (1) having the bent portion (1a), and the liquid lining material (14) is transferred to the inner surface of the pipe (1b) by the action of the airflow. ), in which a spiral body (8) is arranged inside the bent part (1a) along its inner surface (1b), and the liquid lining material (14) is applied to the pipe by the action of airflow. A piping lining method in which the fluid flows in a spiral shape along the spiral body (8) and the inner surface of the bent portion (1b). [2] The method according to claim 1, wherein the spiral body (8) is arranged over substantially the entire length of the pipe (1).