JPS5912913B2 - How to thread a string-like object into a pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for inserting a string-like object into a long pipe such as a gas pipe, water pipe, underground conduit such as a power line or communication cable.

Generally, these pipes are lined or cleaned V1
The condition of the inner surface has been inspected. Also, when inserting power lines, etc., insert a string-like object (including strings, lobes, wires, belts, wires, etc.) to serve as a guide before performing these operations. It is widely practiced to insert or pass other objects through this string-like material. However, it is extremely difficult to first insert the string-like material into these tubes. If the tube is short, it is possible to push a metal wire or the like from one side, but this method cannot be applied to a tube as long as several hundred meters. In addition, various self-propelled devices have been proposed, but their use is limited due to their complex structures and their inability to be applied to pipes that extend vertically, such as maples that cannot be inserted through curved parts. It was hot. Furthermore, if these devices became unable to move forward in the middle of the pipe, they could not be pulled back and the pipe itself could become unusable. A method has also been proposed in which a flexible plastic cylindrical film is inserted into a tube while being reversed using fluid pressure, and then pulled out of the tube. This required a large amount of climbing, and the film often rubbed against the inner surface of the tube, resulting in damage and cuts. The present invention was developed in view of the above situation, and involves inserting a flexible cylindrical body into the tube while inverting it using a special endless double tube, and then pulling out the cylindrical body from the tube while at the same time inserting the string-like object into the tube. It is drawn into and inserted into a pipe, and the force required to insert the string-like object is small, there is no risk of accidents such as friction damage or cutting of the cylindrical body, and the cylindrical body can be used repeatedly. This provides a method that allows you to do so. Accordingly, the present invention combines a flexible cylindrical body having a diameter approximately equal to or larger than the inner diameter of the tube with a flexible outer cylinder having an outer diameter slightly larger than the inner diameter of the cylindrical body. The outer cylinder has an outer diameter of 1 and an inner cylinder made of the same material, and the outer cylinder and the inner cylinder are continuous with each other at both ends, and between the outer cylinder and the inner cylinder. The outer cylinder is expanded to a substantially circular cross section by the fluid enclosed in the inner cylinder, and the inner cylinder is crushed in the diametrical direction. Fold it back and cover the outer periphery of the endless double tube, fix the tip of the cylindrical body annularly to one end of the tube, and cover the endless double tube together with the portion of the cylindrical body covered with it. Insert from one end,
A string-like elongated object is connected to the free end of the cylindrical body, and fluid pressure is applied from the one end of the tube to the other end, and the endless double tube is moved by the fluid pressure. At the same time as the endless double tube is rolled toward the other end, the C tube is rotated toward the other end of the endless double tube to turn the cylindrical body outward. By crimping the endless double tube to the inner surface of the tube and allowing the endless double tube to reach the other end of the tube, the cylindrical body is inserted over the entire length of the tube, and the string-like elongated object is inserted into the cylindrical body. After that, after connecting a string-like object to the free end of the tube, the string-like long object is pulled from the positive end side of the tube to turn the tube inside. The cylindrical body is removed from the pipe by inverting it over its entire length, and the string-like material is drawn into the pipe, and in the first aspect of the present invention, when the cylindrical body is removed, By pulling the string-like elongated object while the endless double tube is inserted into the cylindrical body, the endless double tube is rolled from the other end of the tube toward the one end, and the rolling The cylindrical body is removed while being reversed at the end portion of the endless double tube on the other end side as the tube moves.
In the invention, after the endless double tube is removed from the free end of the cylindrical body, a string-like object is connected to the free end of the cylindrical body, and pressure fluid is sent into the cylindrical body from the one end of the tube. By pulling the string-like elongated object from the one end of the tube while inserting the tube, the cylindrical body is removed from the tube while being reversed.

FIG. 1 shows an embodiment of the present invention.

In FIG. 1, 1 is a tube, and 2 is a lid, and the lid 2 is provided with a pressure fluid inlet 3 and a slit 4.
5 is a cylindrical body, and a string-like elongated object 14 is attached to the free end of the body in advance.
is connected.

6 is an endless double cylinder.

The endless double tube 6 has a structure as shown in FIGS. 2 and 3, and includes a flexible outer tube 7 having an outer diameter larger than the inner diameter of the tube 1, and a flexible outer tube 7 having the same diameter as the outer tube 7. It consists of an inner cylinder 8 having an outer diameter and made of the same material, and the outer cylinder 7 and the inner cylinder 8 are continuous with each other at both ends, and there is a gap between the outer cylinder 7 and the inner cylinder 8. A fluid h is sealed in the cavity 9, and the pressure of the fluid causes the outer tube 7 to expand into a substantially circular shape, while the inner tube 8 is crushed in the diametrical direction by the external pressure. In this endless double cylinder 6), the outer cylinder 7 and the inner cylinder 8 are continuous with each other, so the outer cylinder 7
The inner cylinder 8 does not mean that it is on the outside or inside in a certain specific state, but is fixed to b1.

That is, in FIG. 2, if a rightward force is applied to the inner cylinder 8, the inner cylinder 8 moves to the right, and its right end turns outward to become the outer cylinder 7. Further, the left end of the inner cylinder 8 draws in the outer cylinder 7 and turns it inward to form a part of the inner cylinder. In this way, the endless double cylinder 6 rolls as a whole while being reversed at both ends, and moves to the right. Furthermore, since the friction between the outer cylinder 7 and the outer cylinder 8 is extremely small during such a movement, the above-mentioned movement is performed with an extremely small amount of force. In the embodiment of the present invention shown in FIG.
The bow is drawn out from 0, inserted through the slit 4 of the lid body 2, and further penetrated through the inner cylinder 8 of the endless double cylinder 6.

Furthermore, the tip of the cylindrical body 5 is folded back to the outside at the end of the endless double tube 6, and is placed over the outer tube of the endless double tube 6. Insert from one end of 1! The tip of the cylindrical body 5 is fixed in an annular manner between the tube 1 and the lid 2. This state is shown in FIG. 1a. Next, when pressure fluid such as compressed air is fed from the pressure fluid inlet 3 provided in the lid body 2, fluid pressure acts from the right side of the endless double cylinder 6 to the left side in the figure. The inner tube 8 of the endless double cylinder 6 is pushed by the fluid pressure and moves to the left.

As a result, the endless double tube 6 as a whole rolls and moves toward the left, and along with this, the cylindrical body 5
are sequentially pulled out from the reel 10 and proceed through the slit 4 into the tube 1, fall on the left end of the endless double tube 6 in the figure, are turned outward, and are crimped onto the inner surface of the tube 1. This state is shown in FIG. 1b. When the endless double tube 6 moves further forward and reaches the other end of the tube 1 (the left end in the figure) as shown in FIG. Ru. At this time, the string-like elongated object 14 connected to the free end of the cylindrical body 5 is drawn into the inverted cylindrical body 5 as the cylindrical body 5 is reversed, and is drawn into the inside of the tube 1. A string-like elongated object is further inserted into the cylindrical body 5 that has been inserted through the cylindrical body 5 . Next, a string-like material 12 is connected to the free end of the cylindrical body 5 (see FIG. 1. The DO string-like material 12 in FIG. You can use strings, robes, wires, belts, etc.

By pulling the string-like elongated object 14 from the one end side of the tube 1, the endless double tube 6 is rolled toward the above end side of the tube 1. Tube 6
while inverting it inward at the other end side end of the tube,
At the same time as it is removed from the tube 1, the string-like material 12 is drawn into the tube 1 (FIG. 1e). If the cylindrical body 5 is pulled out from the tube 1 over its entire length, the tube 1 with the string-like material 12 inserted over its entire length can be obtained as shown in FIG. 1F. In this embodiment, the cylindrical body may or may not be airtight.

In the case where the cylindrical body 5 is airtight, when removing the cylindrical body 5 from the pipe 1, the cord-like It is preferable to pull the long object 14. Although this is not necessarily essential,
After the cylindrical body 5 is inserted into the tube 1, the cylindrical body 5 is folded flat due to its own weight, and the cylindrical body 5 and the tube 1 are
Air may remain between the If an attempt is made to remove the cylindrical body 5 at this point, the passage of the endless double cylinder 6 may be obstructed by the accumulated air, making it difficult to remove the cylindrical body 5. Therefore, it is preferable to apply fluid pressure to the inside of the cylindrical body 5 and pull it out while it is in close contact with the tube 1. In this case, if pressure fluid is fed only from one end of the pipe 1, a force will act toward the other end of the endless double-tube 6rc pipe 1, and the string-like long object 14 must be pulled against this force. However, it requires a large amount of work. Therefore, by feeding pressure fluid from the other end of the pipe 1, the cylindrical body 5 is prevented from being crushed, and the fluid pressure on both sides of the endless double cylinder 6 is balanced, and the cylindrical body 5 is It is also possible to reduce the force required for removal. Furthermore, in this case, it is preferable that the pressure of the fluid introduced from the other end of the tube 1 and the pressure introduced from the one end of the tube 1 be approximately equal to N, but either of them may be greater. If the cylindrical body 5 is not airtight, even if pressure fluid is introduced from one end of the tube 1, the effect of compressing the cylindrical body 5 to the inner surface of the tube 1 cannot be achieved, and Even if the cylindrical body 5 is crushed, the passage of the endless double tube 6 is not obstructed, so when the cylindrical body 5 is removed, the tube 1
There is no need to introduce pressure fluid from one end of the tube.

As the cylindrical body without airtightness, for example, a cylindrical cloth made of fibers woven or knitted into a cylindrical shape, or a cylindrical net can be used.

Further, as the airtight cylindrical body, a flexible rubber or plastic cylindrical film can be used. It is also possible to use a cylindrical laminate made by weaving or braiding fibers into a cylindrical shape and covering it with flexible rubber or plastic, making it possible to create a cylindrical body that can withstand repeated use. Obtainable. What is shown in FIG. 4 is yet another Q embodiment of the present invention. In this embodiment, the cylindrical body 5 is made of an airtight material, and the string-like member 14 is connected to the free end of the cylindrical body 5 in advance, as in the embodiment shown in FIG. Then count.

Then, the cylindrical body 5 is inserted into the inner tube 8 of the endless double tube 6, and its end is folded back to the outside at the end of the endless double tube 6 to form the outer tube 7 of the endless double tube 6. The endless double tube 6 is inserted from one end of the tube 1 together with the portion of the cylindrical body 5 covered thereon, and the tip of the cylindrical body 5 is inserted between the tube 1 and the lid 2 in an annular shape. (Fig. 4a), and then supply a pressure fluid such as compressed air from the pressure fluid inlet to roll the endless double tube 6 toward the other end of the tube 1, and at the same time turn the cylindrical body 5 over. and press it onto the inner surface of tube 1 (Fig. 4b).
), the endless double tube 6 is brought to the other end of the tube 1, and the cylindrical body 5 is inserted over the entire length of the tube 1. (Figure 4c)
. At this time, the string-like elongated object 14 connected to the free end of the cylindrical body 5 is drawn into the inverted cylindrical body 5 as the cylindrical body 5 is reversed, and is inserted into the inside of the tube 1. A string-like elongated object is further inserted into the inserted cylindrical body 5. Next, the free end of the cylindrical body 5 is once opened and the endless double tube 6 is taken out, and then the free end of the cylindrical body 5 is closed again, and the string-like long object 14 and the string-like object 12 are connected thereto. (Figure 4d).

Next, pressure fluid such as compressed air is introduced from the pressure fluid inlet 3 of the lid 2, and the string-like elongated object 14 is pulled from one end of the tube 1 while the cylindrical body 5 is pressed against the inner surface of the tube 1. Then, the free end of the cylindrical body 5 is turned inward, and the folded part is removed from the tube 1 while proceeding toward the one end of the tube 1.
The string-like object 12 connected to the free end of the cylindrical body 5 is connected to the reel 1
1 and drawn into the tube 1. (
Figure 4e). By removing the cylindrical body 5 over its entire length from the tube 1 and removing the lid 2, the tube 1 with the string-like material 12 inserted therein is obtained as shown in FIG. 4f. In this embodiment), when removing the cylindrical body 5, it is preferable to rotate the string-like elongated object, twist the inverted cylindrical body, and remove the cylindrical body while applying twist.

By twisting the cylindrical body, the cylindrical body becomes a thin string-like shape, which reduces frictional resistance with the cylindrical body part that is crimped onto the tube 1, and can be removed more smoothly. be. Also in this embodiment, pressure fluid can be fed into the tube 1 from the other end of the tube 1 in order to reduce the force required to remove the cylindrical body 5, but the fluid pressure must be lower than the pressure of the fluid introduced from the one end of the pipe 1. If fluid with a pressure higher than that is fed, the shape of the folded portion of the cylindrical body 5 may not be maintained correctly, and there is a risk that the cylindrical body 5 may not be correctly inverted at the folded portion. . In this embodiment, an airtight cylindrical body is used as described above, and specific examples include a flexible cylindrical film made of rubber or plastic, as in the Q embodiment shown in FIG. A cylindrical laminate can be used.

According to the present invention, the cylindrical body 5 is inserted into the tube 1 while being reversed by fluid pressure, and an endless double tube is placed in the folded part of the cylindrical body 5. Since the cylindrical body 5 is reversed as it rolls, the cylindrical body 5 can be reversed extremely smoothly and with a small force.

In addition, the present invention can be applied to the cylindrical body whether or not it has airtightness, and the range of choices as the material for the cylindrical body is widened, and various cylindrical bodies can be used depending on the situation. can do.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the steps of an embodiment of the present invention. FIGS. 2 and 3 are a vertical cross-sectional view and a cross-sectional view of the endless double cylinder used in the present invention. FIG. 4 is a schematic diagram showing the steps of another embodiment of the present invention. 1... Pipe, 5... Cylindrical body, 6... Endless double tube, 7...
- Outer tube, 8... Inner tube, 12... String-like object, 14... Thin-shaped long object.

Claims (1)

[Claims] 1. A flexible cylindrical body having a diameter approximately equal to or larger than the inner diameter of the tube, and a flexible outer cylinder having an outer diameter slightly larger than the inner diameter of the cylindrical body. It consists of an inner cylinder having the same outer diameter as the outer cylinder and made of the same material, the outer cylinder and the inner cylinder are continuous with each other at both ends, and the inner cylinder is enclosed between the outer cylinder and the inner cylinder. The outer cylinder is expanded to a substantially circular cross section by a fluid, and the inner cylinder is collapsed in the diametrical direction. The endless double tube is placed over the outer periphery of the double tube, and the tip of the cylindrical body is annularly fixed to one end of the tube, and the endless double tube is inserted from the one end of the tube together with the portion of the cylindrical body that is covered with the tube. A string-like elongated object is connected to the free end of the body, and fluid pressure is applied from the one end of the tube toward the other end, and the fluid pressure moves the endless double tube toward the other end of the tube. At the same time, as the endless double tube rolls, the cylindrical body is turned outward at the end portion of the endless double tube on the other end side of the tube, and is crimped onto the inner surface of the tube. By making the endless double tube reach the other end of the tube, the cylindrical body is inserted over the entire length of the tube, and the string-like elongated object is also inserted into the cylindrical body, and then the tube is inserted. After binding a string-like object to the free end of the shaped body, the endless double tube is rolled from the other end of the tube toward the one end by pulling the string-like long object from the one end side of the tube. At the same time, along with the rolling, the cylindrical body is reversed inward at the end portion of the endless double tube on the other end side of the pipe, and the cylindrical body is reversed over its entire length to be removed from the pipe. A method for inserting a string-like object into a tube, the method comprising: pulling the string-like object into the tube at the same time. 2. A method for inserting a string-like object into a tube according to claim 1, wherein the cylindrical body does not have airtightness. 3. The method for inserting a string-like object into a tube according to claim 2, wherein the cylindrical body is a cylindrical cloth made of woven or braided fibers. 4. The method of inserting a string-like object into a tube according to claim 2, wherein the cylindrical body is a cylindrical mesh. 5. A method for inserting a string-like object into a tube according to claim 1, wherein the cylindrical body has airtightness. 6. The method for inserting a string-like object into a tube according to claim 5, wherein the cylindrical body is a flexible rubber or plastic cylindrical film. 7 A cylindrical fabric whose cylindrical body is made of woven or braided fibers,
6. A method for inserting a string-like object into a tube according to claim 5, wherein the tube is a cylindrical laminate coated with flexible rubber or plastic. 8. A method for inserting a string-like object into a tube according to claim 1, characterized in that when the cylindrical body is removed from the tube, pressure fluid is introduced into the cylindrical body from the one end of the tube. . 9. The method for inserting a string-like object into a tube according to claim 8, characterized in that when the cylindrical body is removed from the tube, pressure fluid is also introduced from the other end of the tube. 10. A string-shaped tube is installed in the tube according to claim 9, characterized in that the pressure of the fluid introduced from the one end of the tube and the pressure of the fluid introduced from the other end of the tube are approximately equal. How to insert something. 11 A flexible airtight cylindrical body having a diameter approximately equal to or larger than the inner diameter of the pipe is combined with a flexible outer cylinder having an outer diameter slightly larger than the inner diameter of the cylindrical body. An inner cylinder having the same outer diameter as the cylinder and made of the same material, the outer cylinder and the inner cylinder are continuous with each other at both ends, and the fluid is sealed between the outer cylinder and the inner cylinder. The outer cylinder is expanded to a substantially circular cross section and the inner cylinder is crushed in the diametrical direction.The inner cylinder is inserted into the inner cylinder of the endless double cylinder. The tip of the cylindrical body is annularly fixed to one end of the tube, and the endless double tube is inserted from the one end of the tube together with the part of the cylindrical body covered with it, and the end of the cylindrical body is A string-like elongated object is connected to the free end, fluid pressure is applied from the one end of the tube to the other end, and the fluid pressure moves the endless double tube toward the other end of the tube. At the same time, as the endless double tube rolls, the cylindrical body is turned outward at the end of the endless double tube on the other end side of the tube and is pressed against the inner surface of the tube, and the endless double tube is By letting the double tube reach the other end of the tube, the cylindrical body is inserted over the entire length of the tube, and the string-like elongated object is also inserted into the cylindrical body, and then the cylindrical body is inserted into the tube. After extracting the endless double tube from the free end of the body, a string-like object is connected to the free end of the tube, and then, while feeding pressure fluid into the tube from the one end of the tube to the A method for inserting a string-like object into a tube, which is characterized by pulling the string-like long object, inverting the cylindrical object inward, and removing the cylindrical object from the tube, and simultaneously drawing the string-like object into the tube. . 12. The method for inserting a string-like object into a tube according to claim 11, wherein the cylindrical body is a flexible rubber or plastic cylindrical film. 13. The tube according to claim 11, wherein the tube is a cylindrical laminate made of a cylindrical fabric made of woven or braided fibers and coated with flexible rubber or plastic. A method of inserting objects such as 14. Claim 1, characterized in that when the cylindrical body is removed, a pressure fluid having a pressure lower than the pressure of the pressure fluid fed from the one end of the tube is fed from the other end of the tube.
A method of inserting a string-like object into the tube according to item 1. 15. A method for inserting a string-like object into a tube according to claim 11, characterized in that when removing the cylindrical body, the inverted cylindrical body is removed while being twisted.