JPS5853584B2 - Object for moving inside the pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is useful for repairing the inner surface of various pipes for city gas, natural gas, oil, water, etc., and for fluid replacement when removing or changing the transport fluid. This invention relates to an improvement in an object that is moved by fluid back pressure while in a pipe.

Conventionally, objects for moving inside a pipe have been formed in the shape of a simple bullet, so when used for the above purpose, the lining material may not be fully applied to the inner surface of the pipe at areas where the inner diameter of the pipe is enlarged, such as at pipe joints. Alternatively, there is a drawback that fluid replacement may be incomplete.

Furthermore, in the case of inner surface repair, the above-mentioned drawbacks will be explained in detail with reference to FIG.

In other words, as shown in FIG. 9A, with the liquid lining material e filled between the object A and the object B behind it, an appropriate fluid back pressure is applied to the object B, and the liquid lining material e is applied to the object A. It is assumed that back pressure is applied to move both objects A and B and the liquid lining material e to the left.

As shown in FIG. 9, when the liquid lining material e is applied to the pipe inner diameter enlarged part 10 by the pipe joint 9, objects A and B are inscribed in the pipe 4 on both sides of the pipe inner diameter enlarged part 100. , the existing fluid in the enlarged pipe inner diameter portion 10 remains, and as a result, as shown in FIG. The lining became incomplete due to the influence of residual fluid.

Further, to explain in detail the case where fluid replacement is performed using only object A, even if object A passes through the pipe inner diameter enlarged portion 10, the outer diameter of object A is smaller than the diameter of the pipe inner diameter enlarged portion 10. In addition, some of the existing fluid remained without being pushed out by object A, resulting in incomplete fluid replacement.

In view of the above-mentioned circumstances, the present invention aims to completely perform lining and fluid replacement for the enlarged inner diameter portion of the pipe without essentially impairing the ability to effectively move objects within the pipe due to fluid back pressure. purpose.

In the above-mentioned object for moving inside a pipe, the back pressure fluid is caused to flow into the enlarged inner diameter part of the pipe from the rear of the object with the front part of the object inscribed in the pipe part in the moving direction of the object than the enlarged part of the inner diameter of the pipe. A flow path and a flow path for causing the fluid in the enlarged inner diameter portion of the pipe to flow out in front of the object together with the back pressure fluid, and both flow channels are arranged at a location other than the enlarged portion of the inner diameter of the pipe. so as to be substantially closed by the tube;
It is characterized by forming holes or grooves in the object.

That is, by forming holes or grooves in the object so that the two types of flow paths described above are formed when the object is located at the enlarged inner diameter portion of the pipe, in other words, the back pressure fluid fills the local space of the object. By configuring it so that it flows forward through the pipe, the existing fluid can be reliably driven to the front of the object even in the part where the inner diameter of the pipe is enlarged, and as a result, there is no lining failure due to residual fluid as in the conventional case described above. It is now possible to perform a good lining treatment or complete fluid replacement.

Moreover, since the above two types of flow paths are closed except in the part where the inner diameter of the pipe is enlarged, for example, when an object is made smaller in diameter than the pipe and the existing fluid is to be expelled from the part where the inner diameter of the pipe is enlarged, , the efficiency of moving the object due to the back pressure fluid does not decrease, and since the front part of the object is inscribed in the pipe and the fluid flows around the object, the pressure acting on the surface of the object is reduced. There is no undesirable situation where the object's orientation changes due to the imbalance, and the front part of the object gets caught in the enlarged part of the tube, and overall there is no substantial loss in the ability to move smoothly through the tube. This made it possible to move the tube smoothly.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

The structure of the object A that is moved in the tube 4 by &-3 fluid back pressure shown in FIG. are integrally connected to each other by highly flexible and small-diameter connecting portions 5 and 6 to form a columnar body, and the peripheral surfaces of the columnar body of the tip portion 1, the pressure receiving portion 2, and the rear end portion 3 are connected to the tube 40 normally. It is formed on the circumferential side surface 15 corresponding to the shape of the inner wall surface of the tube in the diameter portion, and is configured to be inscribed in the valve of the normal diameter portion of the tube 4.

7 communicates an annular space formed by the circumferential portion of the connecting portion 5 and the inner wall surface of the normal diameter tube, and a space located within the tube 4 facing the tip portion 1 side. 8 is a flow path formed by a central hole a and a plurality of radial holes b connected to the hole a, and 8 is a flow path formed by a central hole a and a plurality of radial holes b connected to the hole a. A central hole C and a radial hole d, which communicate with a space located inside the tube 4 facing the rear end portion 3 side.
This is a flow path formed by

Note that the rear side of the rear end portion 3 of the hole C is formed into a conical shape, and is formed in a conical flow path portion 8a.

More specifically, holes c and d are bored across the rear part of the object that is not inscribed in the tube 4 and the circumference of the object A that is inscribed,
Holes a and b are bored across the periphery of object A that is inscribed in the tube 4 and the front of the object that is not inscribed, and the openings of holes c and d on the periphery of object A and the openings of holes a, s, and b of the periphery of object A are made. The gap between the opening and
It is configured to be smaller than the length of the tube inner diameter enlarged portion 10, and thus,
In a state where the object A is inscribed in the tube 4 portion on both sides or on the moving direction side in the tube inner diameter enlarged portion 10, the back pressure fluid is supplied from behind the object A through the flow path 8 to the tube inner diameter enlarged portion 10.
At the same time, the passage 1 allows the pipe to flow into the enlarged inner diameter portion 10.
The fluid is discharged to the front part of the object together with the back pressure fluid, and the existing fluid is completely expelled. The tube 4 is substantially closed so that the object A can be smoothly moved within the tube 4 due to fluid back pressure.

Next, the above-mentioned object A for moving inside the pipe and another object B for moving inside the pipe
An example of application in which the inner wall surface of the pipe 4 having the pipe inner diameter enlarged portion 10 by the joint 9 is subjected to lining treatment will be explained with reference to FIG. 2.

As shown in FIG. 2A, portions of the existing pipe 4 corresponding to the area to be internally treated on both sides of the pipe portion 4a are excavated, and valves 11a, 'llb, which were originally provided or provided as needed, are excavated.
The conduit 4 is closed with a gas bag or the like, and the conduit portion 4a is closed.
Cut or remove both sides to make an opening at the end.

Next, as shown in the opening of the figure, both objects A and B are placed inside the cylinder 13 to which the pressurizing device 12 is connected, with object B positioned on the pressure fluid supply side, and the cylinder 13 is Conduit part 4
a, and a tank 19 between both objects A and B.
The liquid lining material e inside is supplied through the pump 20.

Then, as shown in Figure C, pressurized fluid is supplied to the rear of the object B by the pressurizing device 12.

Then, object B moves in the pipe by pushing out the lining material e due to the fluid back pressure, and due to the suppression of the lining material e, object A moves in the pipe using the fluid back pressure, pushing the existing fluid in front of object A. The lining material e is applied to the inner wall of the pipe while being removed, and after the adhered lining material e is suitably hardened, the conduit 4 is connected again.

Next, the action of removing the existing fluid by the object A when passing through the tube inner diameter enlarged portion 10 will be explained based on FIG. 3.

As shown in FIG. 3, when the pressure-receiving portion 2 enters the range of the tube inner diameter enlarged portion 10 with the tip portion 1 and rear end portion 3 inscribed in the tube inner wall surface of the tube inner diameter enlarged portion 10,
In the annular space of the flow path 7.8, which is the communication flow path, the opening of i is no longer blocked by the inner wall surface of the normal diameter pipe, and the lining material e, which is a fluid that applies back pressure to the object A, passes through the flow path 8. The fluid flows into the circumferential gap 10b of the object A in the tube inner diameter enlarged portion 10, and the existing fluid in this gap 10b is expelled in front of the object A through the flow path 7. By setting the constriction state of the flow path 7, With little or no outflow of the lining material e through the channel I, and since both ends of the object A are inscribed, the object A smoothly fills the gap 10b in the enlarged pipe inner diameter portion 10. It is possible to perform lining treatment over the entire inner wall of the pipe without any existing fluid remaining.

As shown in FIG. 4, the other object B has a bellows portion 14a on its rear end edge which has a larger diameter than the outer diameter of the inscribed surface portion 14 in the free state, and has a bellows portion 14a on the rear end edge which has a larger diameter than the outer diameter of the inscribed surface portion 14 in the free state, and A pressure-receiving recess 14b is formed in the inner diameter portion 10, and the entire structure is shaped like a highly flexible bullet to prevent the adhering lining material e from peeling off and to push the excess lining material e forward at the tube inner diameter enlarged portion 10. Because the object A is bendable in all directions due to the connecting parts 5 and 6, and the object B itself is highly flexible, it can be easily bent in a flow path including a bending joint. Even if there is a problem, it can be moved smoothly within the tube.

In addition, as another object B, as shown in FIG.
It can be modified to a structure in which a plurality of bowl-shaped object portions 17 having a shape a and having a high flexibility are connected by a flexible member 18 such as a coil spring.

In this case, the concave side 17b of the bowl-shaped object portion 17 becomes the pressure receiving side.

The object A can be used not only for lining a pipe, but also for replacing fluid within a pipe for various purposes, and the specific configuration of the object A can be changed in various ways, for example, as described below.

That is, as shown in FIG.
. They may be drilled separately.

In addition, as shown in FIG. 7, j
While forming a flow path 7 extending from the peripheral part to the front part,
In a state where the rear end portion 3 of the object A is located in the tube inner diameter enlarged portion 10, a flow path 8 for allowing back pressure fluid to flow into the circumferential gap 10b of the object A is formed in a local portion of the rear end portion 30. Good too.

In addition, as shown in FIG. 8, a groove g1 extending over the rear part not inscribed in the tube 4 and a peripheral part inscribed therein, and a groove f extending over the local part inscribed in the tube 4 and the front part not inscribed in the tube 4 are also formed in the object A. The objects A and the pipe 4 are carved so that they do not intersect and are overlapped in the longitudinal direction of the object A.
The flow path 8 formed by the groove g and the flow path 7 formed by the groove f may be configured to communicate with each other through the circumferential gap 10b of the object A.

Furthermore, the structure shown in FIG. 8 can be modified by making the groove f1g spiral.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the object for moving inside a pipe according to the present invention, and FIG. 1 is a partially cutaway overall side view, FIGS. 2A to 2C are explanatory diagrams of usage examples, and FIG. It is an explanatory diagram of exclusion. FIG. 4 is a detailed view of another object, and FIG. 5 is a sectional view of a modification thereof. 6 to 8 are partially cutaway side views of modified examples of the object, and FIGS. 9A to 9C are explanatory diagrams of conventional examples of the use of the object. A...Object.

Claims (1)

[Scope of Claims] 1. An object A that is moved in a state of being inscribed within a pipe 4 due to fluid back pressure, where the front part of the object A is inscribed in a portion of the pipe 4 in the direction of movement of the object A than a portion 10 with an enlarged inner diameter of the pipe. In this state, a flow path 8 allows the back pressure fluid to flow into the tube inner diameter enlarged portion 10 from behind the object A, and a flow path T causes the fluid in the tube inner diameter enlarged portion 10 to flow out to the front of the object A together with the back pressure fluid. A hole or a groove is formed in the object A so that a hole or a groove is formed in the object A, and so that the flow paths 7 and 8 are substantially closed by the pipe 4 except at a portion corresponding to the enlarged inner diameter portion 10 of the pipe. An object for moving within a pipe characterized by certain things. 2. A hole c in which the flow path 8 is bored in the object A over a rear part that is not inscribed in the tube 4 and a local part that is inscribed in the tube 4.
m d, the flow path T is formed by the object A,
The object for moving within a pipe according to claim 1, characterized in that the object is formed by holes a and b bored over a local part inscribed in the pipe 4 and a front part not inscribed in the pipe 4. 3. The flow path 8 is formed by a groove g carved in the object A over a rear part that is not inscribed in the tube 4 and a local part that is inscribed in the tube 4, and the flow path 7 is formed in the object A through the tube. 4
The object for moving inside a pipe according to claim 1, characterized in that the object is formed by a groove f cut across a local part inscribed in the pipe 4 and a front part not inscribed in the pipe 4. 4 The object A is between the object A and another object B behind it.
Claim 1, characterized in that the flow path 8 is formed so that a liquid lining material e for coating the inner wall surface of the pipe filled as a back pressure fluid for the inner diameter of the pipe flows into the inside of the enlarged inner diameter portion 10 of the pipe. The object for movement within a pipe according to any one of Items 1 to 3.