JPH0448090B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method of lining a tube from the inversion machine side into a pipe line with many bends while inverting it using fluid pressure. .

[Prior Art] As a method of lining a tube while inverting it using fluid pressure from the inverting machine side into a pipe line with many bends, there is a method disclosed in Japanese Patent Application Laid-open No. 141527/1983.

[Problems with the Prior Art] However, in the case of this known example, the pushing of the guide rod (elongated body 6) and the rotation of the tip guide member are manually performed on the ground on the side of the reversing machine. In the case of simple bends,
Gas pipelines with complex curves such as planar S-shapes and three-dimensional S-shapes rely on the intuition of workers, which requires considerable experience and skill and requires long working hours. There is a problem with becoming.

The purpose of the present invention is to solve the problems seen in the above-mentioned known examples in a method of lining a pipe line with many curved parts while inverting a tube using fluid pressure. The goal is to avoid being dependent on it.

[Means to solve the problem] The configuration of the present invention is as follows.

A guide rod that is curved in an arc shape and has a rotatable tip guide attached via a wire is pushed into the pipe by an insertion machine to guide the uninverted tube into the pipe, and the tip of the tip guide is inserted into the pipe wall. When the pipe runs into the pipe and is blocked from entering, the rotating machine is driven by the signal from the pipe direction detection sensor attached to the tip guide to give rotation to the tip guide, and when a reaction force is detected by the reaction force detector. When the insertion machine stops driving, and when the pipe direction detection sensor detects that the tip guide is pointing in the direction of the pipe, the rotating machine is stopped, the insertion machine resumes operation, and the guide rod starts to be pushed in. A method of lining a pipe with many bends while inverting the tube.

[Embodiment] Fig. 1 is a conceptual diagram showing an embodiment of the present invention, in which L is a pipeline to be lined, 1 is a gas pipe, 2 is a bent portion, and 3 is a reversing machine. A non-inverted tube 4 is housed in the tube.

5, as shown in FIG. 2, is a guide having a structure in which a flexible tip guide 6 bent in an arc shape is attached to the tip, and a multi-strand wire 7 for rotating the tip guide 6 is housed inside the core. As shown in FIGS. 2 and 3, the guide rod 5 has a cross-sectional structure in which a coil 5' is molded with resin 5'', and has elasticity.

Reference numeral 8 denotes a head attached to the tip of the tip guide 5, and a magnetic sensor 9 (a pressure sensor may be used) as a pipe direction detection sensor and a tube holding ring 10 are attached to the head 8. 11 is a lead wire for taking out a signal from the magnetic sensor 9.

In FIG. 1, 12 is an insertion machine for the guide rod 5 installed on the ground, and this insertion machine 12 has a pair of track-shaped caterpillars (chuck device) 13, as shown in FIGS. 13' is stretched between the sprockets 14 and 14', the guide rod 5 is gripped between the caterpillars 13 and 13', and the motor 18 drives the sprockets 14 and 14' to run (rotate) the caterpillars 13 and 13'. Then, the guide rod 5 is pushed into the pipe L.
In the figure, 15 is an assembly plate, and 16 is a hanging fitting that attaches the assembly plate 15 to the insertion machine frame 17.

19 is a reaction force detector (load cell) fixed to the insertion machine frame 17, and this detection head 20 is a metal fitting 21 attached to the assembly plate 15.
is in contact with

22 is a rotating machine for rotating the wire 7 extending rearward from the tip guide 6 through the inside of the guide rod 5, and 23 is a mount that holds the guide 5 in a loop shape.

24 is a controller which performs the following control.

At the stage when the tube enters the conduit L while being reversed, the motor 19 of the insertion machine 12 is driven to rotate the caterpillars 13, 13', the guide rod 5 is pushed into the conduit L, and the tube retaining ring is inserted. 1
The tip of the uninverted tube 4 passed through the tube 4 is guided. Then, it approaches the bend 2 of the conduit L, and the sixth
As shown in the figure, when the tip of the tip guide 6 and the uninverted tube 4 abut against the tube wall, the guide rod 5 stops advancing and at the same time the magnetic sensor 9 outputs a signal. At the same time, a reaction force acts on the caterpillars 13, 13', causing the assembly plate 15 to retreat slightly.
When the signal from the magnetic sensor 9 is received, the controller 24 drives the rotating machine 22 to rotate the wire 7 and rotate the tip guide 6. At the same time, the reaction force is detected by the reaction force detector 19, so the insertion machine 1
Stop 2. When the magnetic sensor 9 points in the direction of the pipe due to the rotation of the tip guide 6, a change appears in the signal from the magnetic sensor 9, so confirm that the tip guide 6 points in the direction of the pipe by this change in signal. can. After this confirmation, the rotating machine 22 is stopped, the insertion machine 12 (motor 18) is restarted, and the guide rod 5 is started to be pushed in. In this way, the end of the conduit L is reached each time, overcoming obstacles.

The automatic lining method performed using the above device will be explained in more detail.

a Fix the tip of the uninverted tube 4 to the entrance of the pipe L, pass the uninverted tube 4 through the retaining ring 10 attached to the head 8 of the tip guide 6, and connect the inverting machine 3, insertion machine 12, and rotating machine 22. Set.

b Applying fluid pressure from the reversing machine 3 to the uninverted tube 4, and at the same time driving the insertion machine 12 to apply a pushing force to the guide rod 5, guiding the uninverted tube 4 by the insertion action of the guiding rod 5, and The inside of the pipe L is lined while being reversed by pressure.

c As the reversal progresses, the tip guide 6 approaches the bend 2, and when the tip guide 6 that has moved straight hits the pipe wall at the bend 2 as shown in FIG. 6, a signal is output from the magnetic sensor 9. The rotating machine 22 rotates, and at the same time a reaction force is generated on the guide rod 5.
This reaction force causes the assembly plate 15 to retreat a small amount, and the reaction force detector 19 detects this retreat, and this signal is input to the controller 24, and the insertion machine 12
stops.

d The rotating machine 22 may be rotated to the left or to the right, but when the tip guide 6 rotates, the head 8 of the tip guide 6 faces the pipe direction as shown in FIG. When the head 8 faces the pipe direction, a change occurs in the signal from the magnetic sensor 9, and when this change occurs, the rotation of the rotating machine 22 immediately stops.

e When the rotary machine 22 stops and the tip guide 6 faces the pipe direction, the insertion machine 12 is driven again and the insertion of the guide rod 5 starts.

In this way, all the bends 2 are cleared.

f When the reversal reaches the end of the pipe L, the reversing machine 3 and the inserting machine 12 are stopped, and then the inserting machine 12 is reversely driven to pull out the guide rod 5 from the pipe L.

g After pulling out the guide rod 5, inject heated fluid into the tube to glue and dry the inverted tube, then drain the heated fluid, insert a cutter (for example, a heater-type cutter), and cut the tip of the tube. Open by fusing and complete all inversion work.

[Effects of the present invention] As described above, the present invention attaches a tip guide with a pipe direction detection sensor to the tip side of a guide rod, and rotates the tip guide with an electric signal from the sensor to detect the bending direction of the pipe. Since I tried to clear the bends while identifying the bends, I had the experience of inverting the tube and lining it in a pipeline with many bends.
Regardless of skill level, this can be done automatically using mechanical power, and this automation can greatly shorten the working time.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of the present invention, Fig. 2 is a sectional view of the guide rod and the tip guide, Fig. 3 is a sectional view taken along line A-A, Fig. 4 is a plan view of the insertion machine, and Fig. 5 6 is a side view showing the insertion machine and the reaction force detector, and FIGS. 6 and 7 are action explanatory views. DESCRIPTION OF SYMBOLS 1...Gas conduit, 2...Bent part, 3...Reversing machine, 4...Uninverted tube, 5...Guiding rod, 6...
...Tip guide, 7...Wire, 8...Head, 9
...Magnetic sensor, 10...Retaining ring, 11...
...Lead wire, 12...Insertion machine, 13, 13'...
Caterpillar, 14, 14'... Sprocket, 1
5... Assembly plate, 16... Hanging fitting, 1
7... Insertion machine frame, 18... Motor, 19... Reaction force detector, 20... Detection head, 21... Metal fitting, 2
2... Rotating machine, 23... Frame, 24... Controller.

Claims (1)

[Claims] 1 A guide rod curved in an arc shape and having a freely rotatable tip guide attached via a wire is pushed into the conduit by an insertion machine to guide the uninverted tube into the conduit, and the tip of the tip guide is inserted into the conduit. When it hit a wall and was blocked from entering, the signal from the pipe direction detection sensor attached to the tip guide drove the rotary machine to rotate the tip guide, and the reaction force was detected by the reaction force detector. When the insertion machine stops driving, and when the pipe direction detection sensor detects that the tip guide is pointing in the direction of the pipe, the rotating machine is stopped, the insertion machine resumes operation, and the guide rod begins to be pushed in. A method of lining the tube while inverting it into a conduit that has many bends.