JP3207290B2 - Existing pipe lining strip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band-shaped body which is used as a lining pipe for constructing an existing pipe, and in particular, to prevent marine organisms from adhering to the inner peripheral surface of the existing pipe where seawater enters. The present invention relates to an existing pipe lining strip suitable for a lining pipe.

[0002]

2. Description of the Related Art There is a possibility that sea mussels, barnacles and other marine organisms carried by seawater may adhere to the inner peripheral surface of a pipe into which seawater can enter, such as a cooling pipe of a nuclear power plant. There is. When marine organisms adhere to the inner peripheral surface of the cooling pipe, the attached marine organisms hinder the flow of fluid inside, increasing the flow resistance of the fluid inside the pipe and reducing the cooling efficiency. There is a problem. For this reason, a medicine, a paint, or the like that does not allow marine organisms to adhere is applied to the inner peripheral surface of the cooling pipe.

[0003] In order to prevent marine organisms from adhering to the inner peripheral surface of the pipe, a spherical substance is applied to the inner peripheral surface.
It is also known to increase the shearing force of seawater entering the interior. Also, Japanese Patent Publication No. 3-59754 discloses that when seawater flowing through a pipe is stagnant, marine life is killed by removing dissolved oxygen in the seawater, and the inner circumference of the pipe is reduced. A method is disclosed for preventing marine matter from attaching to a surface.

Further, in the case where the inner peripheral surface of a tube is lined with a spiral tube manufactured by spirally winding the band, a film is previously adhered to the surface of the band as the inner peripheral surface of the spiral tube with an adhesive. Discloses a method in which the inner peripheral surface of a spiral tube lining the inner peripheral surface of the tube is covered with a film, and after the marine organisms adhere to the film, the film is peeled off from the inner peripheral surface of the spiral tube.

[0005]

In the method of applying a drug to the inner peripheral surface of a tube, a substance eluted from the drug into a fluid may adversely affect the surrounding environment. Since the function of preventing the adhesion of marine organisms by the applied drug deteriorates with time, the adhesion of marine organisms cannot be prevented for a long period of time. In the method of preventing the adhesion of marine organisms by applying a spherical substance to the inner peripheral surface of the pipe, the effect varies greatly depending on the flow rate of seawater entering the inside. Cannot be reliably prevented. Further, in the method disclosed in Japanese Patent Publication No. 3-59754, it is not easy to remove dissolved oxygen in seawater.

Further, in the method of coating the inner peripheral surface of the spiral tube with a film and peeling the film after the marine organisms have adhered, the film is attached to the inner peripheral surface of the spiral tube with an adhesive. In addition, the adhesive may deteriorate due to long-term use, and the film may peel off from the inner peripheral surface of the spiral tube. When the film peels off from the inner peripheral surface of the spiral tube, marine organisms directly adhere to the inner peripheral surface of the spiral tube, making it difficult to remove marine organisms.

[0007] In order to solve such problems,
There is an existing pipe lining strip proposed by the present applicant in Japanese Patent Application No. 4-265815. There, the existing pipe lining strip, which is a spiral pipe lining the existing pipe inner peripheral surface by spirally winding the side edges adjacent to each other into an engaged state, By providing a metal plate that can react with seawater to generate marine organism repellent components on the surface part that becomes the inner peripheral surface when it is made, marine organisms adhere to the inner peripheral surface of the existing pipe Of the existing pipe lining is disclosed.

By the way, in this prior art, the following will be described in order to improve the workability when a worker is located in an existing pipe and a band for lining is applied to the inner peripheral surface of the existing pipe by a pasting method. Had improvements.

At the time of construction, it is necessary to fit and engage the side edges of adjacent strips to perform lining. In this prior art, the positional relationship between the fitting portions is determined from the inner surface side of the spiral tube. Since it cannot be visually recognized, accurate positioning of the fitting portion cannot be performed. For this reason, workability is poor, and this has been a bottleneck in improving workability.

The present invention has been made to solve such a problem, and an object of the present invention is to reliably prevent marine organisms from adhering to the inner peripheral surface of an existing pipe, and to make the existing pipe long-term. An object of the present invention is to provide an existing pipe lining strip that can be used stably.

Another object of the present invention is to provide a locking male part and a locking female part when an operator is positioned in an existing pipe and lining the belt-like body on the inner peripheral surface of the existing pipe by affixing method. It is an object of the present invention to provide an existing pipe lining strip capable of confirming the positional relationship of the pipes and reliably performing the lining work.

Another object of the present invention is to check the positional relationship between a locking male portion and a locking female portion without checking the positional relationship.
An object of the present invention is to provide an existing pipe-lining strip that can quickly and surely engage adjacent strips with each other and improve workability.

[0013]

An existing pipe lining strip of the present invention is wound in a coil shape so that adjacent side edges are engaged with each other, thereby lining the inner peripheral surface of the existing pipe. When a lining pipe is formed, a metal plate or a net or a membrane capable of reacting with seawater to generate marine organism repellent components is provided on a surface portion serving as an inner peripheral surface. In the existing pipe lining strip, the means for bringing the side edges into engagement with each other includes a locking male portion provided in the longitudinal direction of one side edge and a longitudinal direction of the other side edge. It is formed by the provided lock female part,
A hinge portion extending in the longitudinal direction is formed at a position deviated inward in the width direction from the position of the locking male portion , and the hinge portion
Can be bent around the fulcrum, thereby achieving the above object.

Preferably, a first stopper rib is formed at the end of the other side edge provided with the locking female portion, and a first stopper rib is formed at one side edge formed with the locking male portion. 2 and a stopper rib is formed, and the first stopper rib and the second stopper rib are brought into contact with each other so that adjacent side edges are aligned with each other. The distance from the first stopper rib and the distance from the locking male portion to the second stopper rib are set to be substantially the same.

[0015]

As described above, a locking male portion and a locking female portion are provided as means for bringing the side edge portions of the adjacent belt-like members into an engaged state, and are deflected inward in the width direction from the position of the locking male portion. The hinge part extending in the longitudinal direction of the band
When formed, the locking male part and its peripheral part can be bent in the cross-sectional direction (thickness direction) with respect to the belt-like body using the hinge part as a fulcrum.

Therefore, when the lining strip is wound in a coil shape around the existing pipe and the lining is applied by the sticking method, the locking male part and its peripheral part are bent to the inner side to form the strip. The worker located in the pipe can perform the engaging operation while checking the positions of the engaging portions, that is, the positions of the locking male portion and the locking female portion.

Further, as described above, the first stopper rib is provided at the end of the other side edge provided with the locking female portion, and the first stopper rib is provided on the side edge provided with the locking male portion. When the second stopper rib is provided and the distance from the locking female portion to the first stopper rib and the distance from the locking male portion to the second stopper rib are set to be substantially the same, the locking is performed. The male part for locking and the female part for locking are positioned, so subsequent engagement work does not require confirmation work,
Can be done immediately.

Moreover, according to the existing pipe lining strip having the above structure, only the strip necessary for lining is required, so that the lining work can be simplified and the space for construction can be reduced. It can be enlarged, and the workability can be improved.

Further, as described above, a metal plate, a net or a membrane capable of reacting with seawater to generate marine organism repellent components is formed on a surface portion which becomes an inner peripheral surface when formed into a lining tube. When provided, the metal plate or the like reacts with seawater flowing inside to generate marine organism repellent components, so that marine organisms do not adhere to the inner peripheral surface of the pipe.

[0020]

Embodiments of the present invention will be described below. The existing pipe lining strip of the present invention is wound into a coil shape to form a lining pipe, and is lined, for example, on the inner peripheral surface of a cooling pipe of a nuclear power plant.

As shown in FIG. 1, a band-shaped body 10 lined on the inner peripheral surface of a cooling pipe of a nuclear power plant has a band-shaped substrate 12 as a main body. A strip-shaped copper plate 60 is adhered to the surface of the substrate to prevent marine organisms from attaching thereto.

On the other surface of the substrate 12, a fitting ridge 13 is provided upright at an appropriate distance from one end surface (one end surface in the width direction) 12a. The fitting ridge 13 is continuous in the longitudinal direction of the substrate 12. The fitting ridge 13 includes a support 13 a slightly longer than the thickness of the substrate 12 and a support 13.
and an insertion portion 13b having a semicircular cross section disposed at the upper end of the insertion portion 13a.

When the substrate 12 is wound in a coil shape, one end surface of the adjacent substrate 12 can be fitted into the other end surface 12b of the substrate 12 as shown in FIGS. A stepped portion 17 is formed on the protruding side of the fitting ridge 13 by the thickness of the substrate 12. Step drop part 1
For example, a hot melt adhesive for bonding to the step-down portion 17 is applied to the upper surface of the substrate 12 near the support portion 13a that can be fitted into the substrate 7. A hook-shaped stopper rib 19a is provided upright on the side edge of the step-down portion 17. The upper end of the stopper rib 19a projects inward in the width direction. On the other hand, a hook-shaped stopper rib 19b is also provided upright at a position at an appropriate distance inward in the width direction from the position of the fitting ridge 13 of the substrate 12. The upper end of the stopper rib 19b also projects inward in the width direction.

In the middle of the stepped portion 17, a fitting recess 18 having a semicircular cross section having a semicircular space into which the insertion portion 13b of the fitting ridge 13 can fit is formed. It is provided so as to project in the same direction as the fitting ridge 13 along the longitudinal direction of the substrate 12. The upper part of the fitting recess 18 has a cross section T
A character-shaped reinforcing rib 16 is provided so as to extend upward. The reinforcing ribs 16 are formed integrally with the substrate 12 along the longitudinal direction of the substrate 12. The reinforcing rib 16
Is a column 16a erected on the upper surface of the substrate 12 so as to extend upward, and the column 16a is provided at the tip of the column 16a.
And a flange portion 16b which is parallel to the substrate 12 so as to be orthogonal to.

Further, a plurality of similar reinforcing ribs 16 having a T-shaped cross section are provided between the fitting protrusions 13 and the fitting recesses 18 of the substrate 12 at appropriate intervals. Each of them is erected integrally with the substrate 12 along the longitudinal direction of the substrate 12.

In addition, a hinge portion 122 having, for example, a U-shaped cross section is provided at a position spaced a predetermined distance inward in the width direction from the fitting ridge 13 of the substrate 12, and is provided over the entire length in the longitudinal direction. The fitting ridge 13 and its peripheral portion can be bent with the thin hinge portion 122 as a fulcrum. The bending of this portion is performed when the fitting ridge 13 is fitted to the fitting recess 18. Here, as shown in FIG. 1, the distance L from the stopper rib 19 a to the fitting concave streak 18 is L.
1 and the distance L from the stopper rib 19b to the fitting ridge 13
2 are set substantially the same.

The copper plate 60 is provided on the stepped portion 1 of the substrate 12.
7 and a portion excluding a portion facing the hinge portion 122. That is, a portion facing the hinge portion 122 is cut out like a slit. The reason for providing such a slit 62 is as follows. The band 10 is
At the time of fitting, the fitting ridge 13 and its peripheral portion are bent with the hinge portion 122 as a fulcrum, and the copper plate 60 is also bent with the portion facing the hinge portion 122 as a fulcrum. When there is a possibility that may separate from the substrate 12, when the slit 62 is formed,
This is because flexibility is imparted to the copper plate 60, and such a problem can be reliably prevented.

Furthermore, when flexibility is imparted, an excessive bending stress can be suppressed from acting on the copper plate 60 at the time of bending, so that the copper plate 60 is not cracked. As described later, the fitting operation of the fitting ridge 13 with the fitting ridge 18 is performed by returning the fitting ridge 13 and its peripheral portion from the state once bent to the copper plate 60 side to the original state. When the thickness of the copper plate 60 is large, plastic deformation occurs at the time of the first bending, and the copper plate 60 does not restore the original shape at the time of fitting, and there is a possibility that peeling may occur due to this. When the flexibility is given to the copper plate 60 by 62, such a problem does not occur.

In place of the slit 62, a copper plate 60
The corresponding portions of the copper plate 60 may be thinned to provide flexibility, or the corresponding portions of the copper plate 60 may be connected by an elastic material. Further, it is preferable that the copper plate 60 conforms to the surface shape of the substrate 12, but if a part of the strip 10 is formed of an elastic body or the like, it is difficult to conform the copper plate 60 to that shape. In such a case, the shape of the copper plate 60 corresponding to that portion may be selected to be different from the other portions. In addition, the number and position of the flexible portions including the slits 62 and the like need not always be provided at the number and position corresponding to the hinge portion 122, but it is preferable to match them as much as possible.

According to the belt-like body 10 having such a configuration, the stopper ribs 19 are formed during pipe production for the following reason.
Since a and 19b position the fitting ridge 13 and the fitting ridge 18, there is an advantage that the subsequent engagement operation can be performed immediately without the need for confirmation work. The details will be described below.

Hereinafter, the belt-shaped body 1 will be described with reference to FIGS.
The construction method using 0 will be described. In the strip 10 of the present embodiment, the strip 10 is introduced from the ground side into the inside of the pipe making machine so that the copper plate 60 is on the inner peripheral side, and the strip 10 is sequentially spirally wound. It is also possible to adopt a construction method in which a pipe is formed and the inside of the cooling pipe 40 (see FIG. 5) is lined with the pipe. It is preferable to form the coil 10 into a coil shape, carry it into the cooling pipe 40, and line the cooling pipe 40 in order.

As shown in FIG. 2, the fitting ridge 13 and its peripheral portion are first folded toward the copper plate 60, that is, the inner surface side with the hinge portion 122 as a fulcrum, as shown in FIG. Then, the folded portion is restored to the original state, whereby the fitting ridge 13 of one band 10 is fitted and engaged with the fitting recess 18 of the other band 10 (see FIG. 4). ).

At the time of performing this fitting operation, a stopper rib 19a is provided at the end of the band-shaped body 10 on the side of the fitting concave ridge 18 as described above, and near the fitting ridge 13, Since the stopper ribs 19b are provided, when the adjacent belt-like bodies 10 are arranged in the tube axis direction, as shown in FIG. The two ribs 10 and 10 are positioned by contacting the stopper ribs 19 b of the body 10. Then, as described above, the distance L1 from the stopper rib 19a to the fitting concave streak 18 is determined.
And the distance L2 from the stopper rib 19b to the fitting ridge 13
Are set to be substantially the same, and when the fitting ridge 13 and its peripheral portion are folded back to the original state with the hinge portion 122 as a fulcrum from this state, the fitting ridge 13 is correctly fitted.
8, the two belts 10, 10 are engaged with each other.

Therefore, according to the belt-shaped body 10 having such a structure, the fitting and the engaging operation can be performed immediately without the operator confirming the fitting position between the fitting ridge 13 and the fitting concave ridge 18. Since it can be performed, the efficiency of the lining work can be improved.

[0035] However, the hinge portion 12 in a state when lining pipe diameter is small, bent the strip 10 to suit the diameter
2 is bent in the thickness direction of the substrate 12, and the force required for the bending is increased as the hinge portion 122 moves away from the fitting ridge 13. Is preferably provided in the vicinity of.

Further, the position when providing a shape having elasticity, as with the arrangement number is the hinge portion 122, particularly without being bound, the inner diameter of the spiral tube which is in contact with the existing pipe circumference In order to prevent the height from becoming smaller, it is preferable to make the height dimension as small as possible. Therefore,
It is preferable to provide a plurality of small-sized elastic shapes rather than one large-sized elastic shape.

As the material of the belt 10 of this embodiment, since a bending stress is locally generated in the hinge portion 122, in order to prevent the belt 10 from being cracked due to the bending stress, A material that does not crack as much as possible, for example, polyethylene is preferable.

In the above embodiment, the copper plate 60 is used as the metal plate for eluting the marine organism repellent component. However, tin, an alloy of copper and tin, and a net-like material or film may also be used. It is possible.

[0039] Also, the dimensional relationship between the substrate 12 and the metal plate, the thickness of the example material is a copper alloy 0.3mm~0.8
When a metal plate of mm (preferably 0.5 mm) is used, the thickness of the substrate 12 is preferably about 2 mm to 4 mm (rib height 10 mm to 20 mm).

The present invention can also be applied to a belt-like body having a structure in which the hinge portion 122 is provided and the stopper ribs 19a and 19b are not provided. By visual inspection of the operator, the alignment state between the fitting ridge 13 and the fitting dent 18 can be immediately confirmed, so that such a state cannot be checked in advance. There is an advantage that the fitting and engaging operations can be performed quickly and reliably.

The above-described fitting and engaging operations can be performed by a worker who has entered the spiral tube 20 using a normal hammer.
It is more preferable to use an air hammer 70 as shown in FIG.

When the lining pipe 20 is formed in the cooling pipe 40 as described above, cooling water flows through the lining pipe 20 in order to make the cooling pipe 40 function. Since the inner peripheral surface of the lining pipe 20 is covered with the copper plate 60, when the cooling water flows through the cooling pipe 40, the copper plate 6
From 0, marine organism repellent components such as copper ions and patina, which is a corrosive product of copper, are generated.
Marine organisms are prevented from attaching to the sea. In addition, since the copper plate 60 can generate marine organism repellent components for a long period of time, the function of preventing adhesion of marine organisms is exhibited for a long period of time.

When copper ions and the like are no longer generated from the copper plate 60, foreign substances such as marine organisms adhere to the inner peripheral surface of the lining pipe 20. In this case, the coil ends from the other end of the cooling pipe 40. The end of the strip 10 wound into a shape is a cooling pipe 40.
And the lining tube 20 is dismantled. When the lining tube 20 is dismantled, the marine organisms attached to the inner peripheral surface of the lining tube 20 are removed together with the strip 10 pulled out from the cooling tube 40. This pull-out can be performed manually, but if a larger pull-out force is required, a winch or the like may be used.
If the marine life remains in the cooling pipe 40 after the strip 10 thus disassembled is completely pulled out from the cooling pipe 40, a well-known pipe in the cooling pipe 40 is used. The inside of the cooling pipe 40 is cleaned by jetting jet water by a cleaning machine. Then, the lining tube 20 is formed again on the cooled cooling tube 40 in the same manner as described above.

FIG . 6 shows another embodiment of the strip of the present invention.
In the belt-shaped body of this embodiment, the copper plate 60 is mechanically fitted to the substrate 12. For this reason, the copper plate engaging concave portions 123 and 124 are provided at two positions on the inner surface side of the substrate 12. That is, the fitting ridge 13 that can be bent with the hinge 122 as a fulcrum.
And a portion corresponding to the periphery thereof is formed with a copper plate engaging recess 123 having a relatively short groove width, and a portion extending from a position close to the hinge portion 122 to the fitting concave streak 18 is provided with a copper plate engaging recess 123. A copper plate engaging recess 124 having a significantly larger groove width is formed.

In the belt-shaped body of this embodiment, a copper plate 60 having a size corresponding to the copper plate engaging concave portion 124 is mechanically fitted in advance, and after the pipe is formed, the copper plate 60 having a size corresponding to the copper plate engaging concave portion 123 is formed. The construction method of mechanically fitting is adopted. Therefore, there is no hindrance to the bending and folding operation of the fitting ridge 13 and its peripheral portion.

FIG . 7 shows another embodiment of the strip of the present invention. In this embodiment, a copper plate 60 having a fitting ridge 13 is provided.
On the basis of the above, a substrate (outer skin) 12 having stopper ribs 19a and 19b, reinforcing ribs 16, and fitting ridges 18 is bonded or simultaneously extruded to produce the belt-shaped body 10.

[0047] According to the band-like body of this embodiment has an advantage of collectively manufactured at the factory. FIG. 8 shows another embodiment of the strip of the present invention. In this embodiment, a copper plate 60 is used.
In order to prevent exfoliation due to non-pressure, an anchor 63 is provided on the copper plate 60, and the belt 10 is manufactured by simultaneously extruding polyvinyl chloride.

In the case of the belt-shaped body of this embodiment, there is an advantage that it can be manufactured collectively in a factory.

[0049]

According to the belt-shaped body for existing pipe lining according to the first aspect, when the inner circumference of the existing pipe is to be lined, the inner circumference reacts with seawater to repel marine organisms. Since a metal plate or the like that generates components is provided, marine organisms are prevented from adhering to the lining pipe, and the existing pipe can be made stable for a long time without impairing flowability.
In addition, as means for bringing the side edges of the adjacent strips into an engaged state, a locking male portion and a locking female portion are provided,
A hinge portion extending in the longitudinal direction of the band is formed at a position deviated inward in the width direction from the position of the locking male portion , and
Since the locking male part and its peripheral part are made to be able to bend in the cross-sectional direction with respect to the belt-shaped body with the flange part as a fulcrum, when the lining band-shaped body is pasted to the existing pipe by lining method In addition, the worker located in the pipe can perform the engaging operation while visually confirming the positions of the engaging portions, that is, the positions of the locking male portion and the locking female portion. Therefore, lining work can be performed accurately and quickly,
Construction efficiency can be improved.

Further , according to the existing pipe lining strip according to the second aspect, the first stopper rib is provided at the end of the other side edge provided with the locking female portion.
A second stopper rib is provided on the side edge on the side where the locking male portion is provided, and the distance from the locking female portion to the first stopper rib and the second distance between the locking male portion and the second stopper rib are determined. Since the configuration is such that the distance to the stopper rib is set to be substantially the same, the locking male part and the locking female part are automatically positioned, so that the fitting and engagement work does not need to be confirmed, and It can be carried out. Therefore, the construction efficiency can be further improved.

Further , according to the existing pipe lining strip as described above, only the strip necessary for lining is required, so that the lining work can be simplified and the space for construction can be increased. , Workability can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an existing pipe lining strip of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the fitting protrusion of the belt-shaped body of FIG. 1 and a peripheral portion thereof are folded toward the copper plate side.

FIG. 3 is a schematic cross-sectional view showing a fitting operation of the belt-shaped body of FIG.

FIG. 4 is a partial cross-sectional view showing a fitted state of the belt-shaped body of FIG. 1;

FIG. 5 is an explanatory view showing a mode in which the belt-like body of FIG. 1 is wound in a coil shape in an existing pipe.

FIG. 6 is a sectional view showing another embodiment of the existing pipe lining strip of the present invention.

FIG. 7 is a cross-sectional view showing another embodiment of the existing pipe lining strip of the present invention.

FIG. 8 is a cross-sectional view showing another embodiment of the existing pipe lining strip according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Belt 13 Fitting ridge 16 Reinforcement rib 18 Fitting concave ridge 19a, 19b Stopper rib 20 Lining pipe 40 Cooling pipe 60 Copper plate 62 Slit 63 Anchor 122 Hinge part 123, 124 Copper plate engaging concave part

Claims (2)

(57) [Claims] 1. A lining pipe for lining the inner peripheral surface of an existing pipe by making the side edges adjacent to each other wound in a coil shape into an engaged state. An existing pipe lining strip provided with a metal plate or a net or membrane capable of generating a marine organism repellent component by reacting with seawater on a surface portion serving as a peripheral surface, wherein the side edges are connected to each other. Is formed by a locking male portion provided in the longitudinal direction of one side edge portion and a locking female portion provided in the longitudinal direction of the other side edge portion. At the position deviated inward in the width direction from the position of the part,
A hinge portion extending in the longitudinal direction is formed, and the hinge portion is supported.
An existing pipe lining strip that can be bent as a point . 2. A first stopper rib is formed at the end of the other side edge provided with the locking female part, and a second stopper is formed on one side edge formed with the locking male part. The first rib for stopper and the second rib for stopper are brought into contact with each other so that adjacent side edges are aligned with each other.
2. The existing pipe lining strip according to claim 1, wherein the distance from the stopper rib and the distance from the locking male portion to the second stopper rib are set substantially equal.