JPS6151531B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves introducing a cylindrical lining material, whose entire inner surface is coated with adhesive, into a conduit while being inverted by a pressurizing device with one end of the lining material being fixed. Therefore, regarding a method for lining the inner surface of a conduit in which a cylindrical lining material is bonded to the inner surface of the conduit, the purpose is to develop a technique that allows the end treatment of the lining material at the end in the introduction direction to be carried out well, quickly, and easily. It is about providing.

That is, when carrying out this type of method for lining the inner surface of a conduit, when the cylindrical lining material introduced into the conduit under pressure reaches the end in the introduction direction, it is restricted from running outward as it is. Conventionally, a bottomed cylindrical cup for receiving the conduit was attached to the end of the conduit for this purpose. In addition, when introducing the cylindrical lining material into the conduit, a method of applying pressure is taken to invert the lining material and make it travel while adhering to the inner surface of the conduit. In order to prevent the internal pressure rising in the downstream pipeline from interfering with the running of the lining material, it is necessary to purge the air in the downstream pipeline, and for this reason conventionally a purge hole is formed in the receiving cup. Was. However, in order to ensure that the lining material is received, it is not possible to make a hole that is too large at the bottom of the cup, which results in insufficient air purging, which increases the internal pressure of the pipe, and There was a problem that had a negative effect on the smooth running of the material and, furthermore, on the good adhesion to the inner surface of the conduit during its running.

Furthermore, after the introduction of the lining material, there is a pressure-holding process in which the inside of the lining material is maintained at a constant pressure in order to ensure that the lining material adheres to the entire inner surface of the pipe. Conventionally, the receiving cup is removed from the conduit, the lining material is cut at a point in the middle corresponding to the end of the conduit, and then the cut end is applied to the edge of the conduit. The conduit was then airtightly closed by attaching another non-porous blocking plate to the end of the conduit, and the blocking plate was removed after the pressure was maintained. This required a lot of troublesome work, resulting in poor workability.

In view of the above circumstances, the present invention is capable of performing air purging very smoothly and well, allowing the lining material to travel extremely smoothly, and while being able to adhere well to the inner surface of the conduit while traveling, the lining material In addition to being able to reliably prevent run-through, the work required to airtightly close the pipeline to maintain pressure after introduction can be done quickly and easily, significantly improving overall work efficiency. The purpose is to provide a method.

In the method for lining the inner surface of a conduit according to the present invention, in the method described above, prior to introducing a cylindrical lining material into the conduit, a porous material having high flexibility and bendability is placed at the end of the conduit in the introduction direction. It is characterized by being equipped with a bag-like body capable of receiving the cylindrical lining material.

In other words, suitable examples of this bag-like body include a net made of thin metal wires or composite wires, and a rubber membrane bag or a synthetic resin sheet bag with many holes. By using the body, sufficient air purge can be performed with very low airflow resistance, making it possible to run the lining material very smoothly, and even during the running and at the final stage. The lining material can be extremely well adhered to the inner surface of the conduit, and the bag-like body can also catch the lining material well and reliably prevent it from running through.

In addition, when airtightly closing the conduit which is necessary to maintain pressure inside the lining material after the introduction is completed, from the outside of the highly flexible and bendable bag-like body, the terminal end of the conduit of the reaching lining material is By lashing the corresponding inverted points with string or wire, for example, the airtight sealing work can be accomplished extremely quickly and easily, and overall the end treatment of the lining material is easier than with conventional methods. It has now become possible to perform the work with good efficiency.

An embodiment of the method of the present invention will be described based on the drawings. A cylindrical lining material 1, whose entire inner surface is coated with adhesive by appropriate means, is wound around a drum 2, and an inversion tank is equipped with the drum 2. 3 is connected to a pressurizing device 5 such as a compressor via an air hose 4, and one end of the lining material 1 is fixed to the starting end of a conduit (for example, an old gas conduit) 6 or the outlet of the tank 3. , conduit 6
A bag-like body 7 made of a highly flexible and bendable porous material is attached to the terminal end of the tank 3 by taping 8 or the like, and then the pressurizing device 5 is driven to supply compressed air into the tank 3. is introduced into the conduit 6 while forcibly inverting the cylindrical lining material 1 one after another.
The inner surface of the lining material 1 after being turned over is adhered to the inner surface of the conduit 6 during this travel.

As the lining material 1 travels, the air in the conduit 6 on the downstream side in the travel direction from the leading end of the lining material 1 passes through the bag-like body 7 and is sufficiently purged with almost no resistance.
(See FIG. 1) When the lining material 1 reaches the terminal end of the conduit 6, it is received by the bag-like body 7 (see FIG. 2).

Next, the bag-like body 7 receiving the lining material 1
The part of the lining material 1 that is being turned over along with the bag-like body 7 is secured from the outside with a suitable securing material 9 such as a string or wire, and the end of the lining material 1 is airtightly closed, while the pressurizing device 5 is stopped. After removing the tank 3, the starting end of the conduit 6 is closed with a shielding plate 10, and the pressurizing device 5 is connected to this shielding plate 10 via the hose 4. Then, the pressurizing device 5 is driven to pressurize and hold the inside of the lining material 1 to ensure adhesion between the lining material 1 and the conduit 6 (see FIG. 3).

In addition, after securing the lining material 1 together with the bag-like body 7, and before pressurizing and holding, the bag-like body 7 is removed from the conduit 6 as shown in FIG. 1 and a quick-drying adhesive 1
1 to prevent adhesion failure that tends to occur at the terminal and the resulting peeling.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the method for lining the inner surface of a conduit according to the present invention, and FIG. 1 is a partially cutaway sectional view schematically showing the equipment, and FIGS. 2 to 4 are main parts showing the work procedure. It is a partially cutaway sectional view. 1... Tubular lining material, 5... Pressure device, 6
...duct, 7...bag-like body.

Claims (1)

[Claims] 1. By introducing the cylindrical lining material 1, whose entire inner surface is coated with adhesive, into the conduit 6 while being inverted by the pressurizing device 5 with one end fixed, the cylindrical lining material 1 is A method for lining the inner surface of a conduit in which a material 1 is adhered to the inner surface of the conduit 6, in which, prior to introducing the cylindrical lining material 1 into the conduit 6, a flexible and bendable A method for lining the inner surface of a conduit, which comprises installing a bag-like body 7 made of a highly porous material and capable of receiving the cylindrical lining material 1.