JPS63219990A - Underwater organism attachment preventive instrument for inner surface of duct - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for installing pipes, such as seawater transport pipes, at important points such as the inner surface of the connecting portion or the inner surface of the T-shaped portion, on which aquatic organisms adhere to the inner surface of the pipe. This invention relates to a device for preventing aquatic organisms from adhering to the inner surface of a pipe, which prevents aquatic organisms from adhering to the area.

[Problems to be solved by the prior art and the invention] In seawater transport pipelines, Fujibbo occurs under low flow velocity.

Aquatic organisms such as mussels may attach to them and obstruct the flow, or they may detach and cause problems to downstream equipment.

In order to prevent the attachment of such organisms, it is necessary to take measures such as ensuring a high flow rate according to the specifications of the inner surface of the pipe. However, organisms often adhere to areas where local changes in flow velocity occur, such as flange connections and T-shaped sections, so it is necessary to remove them periodically or apply antifouling paint to these areas. will be taught. here.

Although the latter has a remarkable effect on preventing biofouling,
It is necessary to repaint every three years to update its functionality.

In addition, polyethylene lined pipes are widely used due to their excellent durability and low critical flow velocity for biofouling.
Due to the low adhesion of the paint, complicated treatments such as pre-treatment of the target surface were required before painting.

In view of this situation, the present inventors have studied various biofouling prevention means that can be easily applied to important points in pipes with various inner surface specifications and have a long effective period, and as a result, they have achieved the present invention. It is something that

[Means for solving problems]

The present invention is made of a copper-based metal body, and can be brought into contact with key points on the inner surface of the pipe to form a ring. It has a ring-shaped main body separated at least at one point on the circumference, and an interconnection mechanism that interconnects mutually facing circumferential ends of the ring-shaped main body, and at least one of the interconnection mechanisms has a ring diameter. The gist of the present invention is a device for preventing aquatic organisms from adhering to the inside of a pipe, which is characterized by having an adjustment function.

[Effect]

According to the aquatic organisms adhesion prevention tool for the inner surface of a pipe having the above structure, the ring-shaped main body is inserted into a location on the inner surface of the pipe where aquatic organisms are likely to adhere, and then the separated circumferential end on one circumference is inserted. By connecting the parts while expanding the ring diameter using an interconnection mechanism that has a ring diameter adjustment function.

The outer circumferential surface of the ring-shaped main body can be easily fixed by pressing it against the inner surface of the tube. Since this ring-shaped body is made of copper-based metal, it can prevent aquatic organisms from attaching to it.

The pipe line in the present invention refers to a metal pipe whose inner surface is coated with polyethylene or epoxy resin paint 2 mortar, etc.
Or flange a humid pipe, bare metal pipe, etc.

Connections are made using Victoric type joints, bayonet joints, welding, etc., and repair coatings are applied to the welded parts as necessary.

Mainly refers to pipelines for transporting seawater. In addition, important points within the pipeline are areas where aquatic organisms are likely to attach, and 1.
For example, the inner side of a connecting portion such as a flange, the inner side of a weld bead portion, or a T-shaped portion or an L-shaped portion adjacent to these connecting portions.

The material constituting the ring-shaped main body of the present invention is a copper-based metal, and specifically, pure copper or cupronickel can be exemplified. Such a ring-shaped body of copper-based metal,
Applicable to bare metal surfaces on the inner surface of pipes.

A resin film is placed between the ring-shaped body and the tube body to prevent battery corrosion caused by the copper-based metal used in the ring-shaped body.

It is best to insulate by sandwiching a piece of cloth.

Such as flange connections or weld beads on pipelines.

It is preferable that the ring-shaped main body used for a portion having a recess or protrusion on the inner surface of the conduit has a protrusion or recess on its outer circumferential surface. This acts as a stopper to prevent movement of the ring-shaped main body.

The present invention will be explained in more detail below with reference to an embodiment shown in one drawing.

〔Example〕

FIG. 1 is a sectional view showing an example in which an underwater organism adhesion prevention device for the inner surface of a pipe according to an embodiment of the present invention is applied to a flange connection part of a pipe, in which 1 is a pipe constituting the pipe, 2 3 is a flange for connecting the tube, 3 is a resin coating provided on the inner surface of the tube 1 and the end face of the flange 2, and 4 is a packing interposed between the flanges.

Reference numeral 5 denotes an underwater organism adhesion prevention device attached to the inner surface of the flange connection part of the pipe, and the ring-shaped main body 6 is made of a copper metal body.
and a connecting plate 7. As shown in FIG. 2, the ring-shaped main body 6 has a ring shape as a whole, and
The ring-shaped body 6 is inserted into the tubular body 1 and the outer diameter of the ring-shaped body 6 is expanded by widening the interval between the grooves 8. It is possible to attach it by pressing it against the inner surface of the tube. As shown in FIG. 3, circumferential ends 6A, 6 of the ring-shaped main body
A has a tapered shape, and the connecting plate 7 is inserted between the circumferential ends 6A, 6A of this tapered shape.
It has a wedge part 7A that pushes out the ring, and a flange part 7B that is attached to the inner surface of the ring-shaped main body 6. Therefore, the wedge portion 7A is pushed between the circumferential ends 6A, 6A,
By fixing the flange portion 7B to the ring-shaped main body 6 with screws 9.

The outer diameter of the ring-shaped main body 6 can be expanded, and the outer peripheral surface can be pressed and fixed against the inner surface of the tube body 1. This connecting plate 7 is
An interconnection mechanism is constituted that interconnects the ends in the circumferential direction and has W1 ability to adjust the outer diameter of the ring-shaped main body.

Note that the first circumferential end portions 6A, 6A and the wedge portion 7A are the third
As shown in the figure, if the tubular body is tapered not only in the radial direction but also in the longitudinal direction, the connecting plate 7 can be moved in the longitudinal direction of the tubular body to form a ring shape. The outer diameter of the main body 6 can be further enlarged,
preferable.

The interconnection mechanism for interconnecting the circumferential ends of the ring-shaped main body 6 is not limited to the connection plate 7 shown in FIG. 3.

Various changes are possible. FIG. 4 and FIG. 5 are examples of this, in which a cut-and-raised portion 10 is formed near each circumferential end of the ring-shaped main body 6 facing each other, and a cut-and-raised portion 10 is formed between the cut-and-raised portion 10 and the ring-shaped main body 6. A plate-shaped wedge 11 is engaged. By pushing this plate-shaped wedge 11 in the direction of the arrow in FIG. 5, the ring-shaped main body 6 is deformed in the direction of the arrow in FIG. 4, the ring diameter is expanded, and the outer peripheral surface is pressed against the inner surface of the tube. Can be done. FIG. 6 shows still another example, in which the ends of the ring-shaped main body 6 are processed into steps, overlapped, and fixed with flat head screws 12. Here, the hole through which the flat head screw 12 passes is an elongated hole, which can perform the function of adjusting the ring diameter. FIG. 7 shows yet another example.

A flange 13 is provided near the end of the ring-shaped main body 6, and the flanges 13 and 13 are connected with a turnbuckle 14.

The ring diameter can be adjusted. Of course, it is also possible to use screws and turnbuckles together.

The interconnection mechanism that connects the ends of the ring-shaped body 6 is designed to minimize irregularities when the ring-shaped body is disposed within the conduit so as to minimize new disturbances in the flow within the conduit. Furthermore, it is desirable that the material of the parts used for the end connection 1 structure be the same kind of metal as the ring-shaped main body.

In FIG. 2, three continuous protrusions 6B extending in the circumferential direction are formed on the outer peripheral surface of the ring-shaped main body 6.

This protrusion 6B is provided so as to fit into a recess on the inner surface of the flange connection part, and is similar to the protrusion 6B of the ring-shaped main body 6.
By fitting the ring-shaped main body 6 into the recess on the inner surface of the pipe, it is possible to effectively prevent the ring-shaped main body 6 from moving in the pipe axis direction. That is, this protrusion 6B acts as a stopper that prevents the ring-shaped main body 6 from moving.

The protrusions provided on the outer circumferential surface of the ring-shaped main body 6 are not limited to being continuous in five circumferential directions as shown in FIG. 2, but may be discontinuous. These protrusions are formed by pressing the ring-shaped body,
It can be formed integrally with the ring-shaped main body by roll forming or machining from raw metal. Further, as shown in FIG. 8, a part 6C of the ring-shaped main body 6 may be cut and raised to form a protrusion.Furthermore, a bolt or rivet may be set on the ring-shaped main body 6, or a part 6C may be cut and raised on the outer peripheral surface of the ring-shaped main body. The protrusion may be formed by welding or the like. In this case, consideration should be given to avoiding the use of attachment materials and welding materials made of dissimilar metals to prevent battery corrosion. In addition, as mentioned above, when the protrusion is integrally formed with the ring-shaped main body by pressing, roll forming, cutting, etc.
The above-mentioned considerations are not necessary, and bending to the pipe diameter can be uniformly performed.

Further, the above-mentioned bending may be performed by either a cold method or a hot method. It is economical to perform bending and protrusion forming at the same time using grooved rolls.

In FIG. 1, since the ring-shaped main body 6 is attached to the inner surface of the pipe, it is desirable to minimize the occurrence of turbulence in the flow within the pipe. Therefore, in the embodiment shown in FIG. 6D is gently molded.

This cross-sectional shape can also be changed in various ways2.For example, as shown in FIG. 9, the inner surface may be shaped like a gentle arc, or it may be flat as shown in FIG. 1, or the inner surface may be shaped like an arc as shown in FIG. In the case of a metal ring, the suitable thickness of the ring-shaped main body 6 varies depending on the metal composition, pipe diameter, length of the target part, etc. 2 For example, if it is pure copper, an appropriate rigidity can be obtained in the range of 1 to 5 mm. At the same time, there is little risk of corrosion loss. The width of the ring-shaped main body 6 varies depending on the object, but in the case of a flange portion, a range of 3 to 300 sws is suitable.

Figures 1θ, 11, and 12 each show still other cross-sectional examples of the ring-shaped body 6, and the ring-shaped body 6 in Figure 1O fits into the recess on the inner surface of the flange connection part. One in which the left and right lengths of the protrusion 6B are different, FIG. 11 shows one in which the protrusion 6B is formed at one end of the ring-shaped body 6.
The figure shows a ring-shaped main body 6 consisting only of a portion that fits into the recess of the flange connection portion. In the case of the ring-shaped main body 6 shown in FIG. 12, a rod-shaped, tubular, groove-shaped, or wedge-shaped one having a trapezoidal cross section can be used.

The ring-shaped main body 6 shown in FIG. 2 has an integral structure with only one cutout on the circumference, but instead of this, the ring-shaped main body 6 is divided into a plurality of segments. may be connected to form a ring;
In this case, any connecting means can be used to connect the segments.2 For example, as shown in FIGS. 13 and 14, pin insertion portions 16 may be formed at the ends of each segment 6a, 6b. However, the bottle insertion portions 16 may be connected by bottles (not shown).

FIG. 15 shows another embodiment of the present invention.

It shows an underwater organism adhesion prevention device 4a attached to the T-shaped portion of the pipe. In the figure, reference numeral 20 denotes a weld bead portion that connects the tubular bodies 1, and because of this bead portion 20, the tubular body 1 has a protrusion on its inner surface. The underwater organism adhesion prevention device 4a is the second
A ring-shaped main body 6C having a similar shape to the ring-shaped main body shown in the figure.
The connecting plate 7a has a similar shape to the connecting plate 7 shown in FIG. It is fixed at In addition, on the outer peripheral surface of the ring-shaped main body 6C, a second
Unlike the embodiment shown in the figure, the recess 6 that fits into the bead portion 20
It forms E. By fitting this recess 6E with the protrusion (bead portion 20) on the inner surface of the tube.

The ring-shaped main body 6C does not move within the tube, thereby preventing biofouling.

Incidentally, in all of the above embodiments, the ring-shaped main body is configured to fit into the protrusion 6B or recess 6E provided on the outer peripheral surface of the ring-shaped main body and the recess or protrusion on the inner surface of the tube body to prevent movement of the ring-shaped main body. It is also possible to omit the protrusions or recesses on the outer circumferential surface of the ring-shaped main body and to fix the ring-shaped main body only by frictional contact between the outer circumferential surface of the ring-shaped main body and the inner surface of the tube.
Further, in order to securely fix the ring-shaped main body at that time, an arc-shaped plate member may be joined to the inner surface of the tube at least on the downstream side of the ring-shaped main body, and may act as a stopper.

Below, the results of an experiment using the aquatic organism adhesion prevention device of the present invention will be explained.

[Example ■]

At the flange connection part of the seawater transport pipeline, a flanged inner polyethylene lined steel pipe with a nominal diameter of 1000A is connected.
A pure copper aquatic organism adhesion prevention device with the structure shown in Figure 1 was installed. However, unlike the structure shown in Figure 1, the ring-shaped body of the aquatic organism adhesion prevention device used in this experiment was a two-part type and was made by cutting out one piece (no grooves were formed on the inner surface). The thickness of the ring-shaped main body is 3111 and the width is 200 m.

The protrusion on the outer circumferential surface is a continuous protrusion with a chevron-shaped cross section, 5 meters wide at the base and 5 meters high.

Seawater was flowed through this pipe at a flow rate of approximately 3.5 m/sec, and the status of biofouling was observed for 12 months from September 1985 to September of the following year. 9 The underwater biofouling prevention device according to the present invention. There were no living organisms attached to the two locations where the pipes were attached, but mussels and barnacles were growing thickly in the recesses of the connections where no treatment was applied.

[Example ■]

T transition from 100OA to 600A in the above pipeline
A pure copper aquatic organism adhesion preventive device with the structure shown in Fig. 15 was attached to the part. As a result of water flow observation, similar to Example I, the effect of the underwater organism adhesion prevention device according to the present invention was clearly recognized.

〔Effect of the invention〕

As described in detail above, the device for preventing the adhesion of aquatic organisms to the inside of pipes according to the present invention can be easily installed in pipes such as seawater transport pipes where aquatic organisms tend to adhere, and prevents the adhesion of organisms. It can be prevented in advance and over a long period of time, and can be easily removed and replaced, making a tremendous contribution to the operation and maintenance of such transport pipes.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a flange connection part to which an underwater organism adhesion prevention device for pipe inner surface according to an embodiment of the present invention is attached.
The figure is a perspective view of a ring-shaped main body used in this embodiment. FIG. 3 is a side view showing an interconnection mechanism at the circumferential ends of the ring-shaped main body, FIG. 4 is a side view showing a modification of the interconnection mechanism at the circumferential ends of the ring-shaped main body, and FIG. Its bottom view, FIG. 6 is a sectional view showing another modification of the interconnection mechanism of the circumferential ends of the ring-shaped body, and FIG. 7 is a sectional view showing still another modification of the interconnection mechanism of the circumferential ends of the ring-shaped body A side view showing a modified example,
FIGS. 8 and 9 are sectional views, FIG. 10, and FIG. 1I, respectively, showing modified examples of the cross section of the ring-shaped main body. Fig. 12 is a sectional view showing a modified example of the cross section of the ring-shaped main body attached to the flange connection part, and Fig. 13 shows an example of the part connecting each segment when the ring-shaped main body is made into a plurality of segments. The plan view, Figure 14 is the side view,
FIG. 15 is a cross-sectional view showing a T-shaped portion to which an underwater organism adhesion prevention device for the inner surface of a pipe is attached according to another embodiment of the present invention. 1...Pipe body 2...Flange 3...-Resin coating 4...Pankin 5...-Aquatic organisms adhesion prevention device for pipe inner surface 6...Ring-shaped main body 68-...Circumferential end 6B −
Protrusion 6E--Concave 7・Series of connecting plates 7A・-Wedge part 10-・-Cut and raised 11・-Plate wedge 12
...-Flat head screw 13-Flange 14--Turnbuckle agent Patent attorney Kyo Matsu 31, employment figure 1 21' 2 4 (Fig. 5 + i-4^ [4hei-j, 121m 3 Jij'15 (Tsu Proceeding City Authorization (Spontaneous) April 7, 1986 Commissioner of the Patent Office Kuro 1) Akio Yu, Indication of the Case Patent Application No. 50105 No. 50105 of 1988 2, Name of the Invention Road surface aquatic organisms adhesion prevention device 3, relationship with the amended case Patent applicant address 1-13-10 Tsukiji, Chuo-ku, Tokyo Name
Daiichi Koshuha Kogyo Co., Ltd. (Representative) Atsushi Hirayama 4, Agent ■116 6. Subject of amendment Detailed explanation of the invention in the specification column 7, Contents of amendment As shown in the attached sheet (11 Specification page 12) Insert the following sentence after "You may do so." in the third line from the bottom. Needless to say, the biofouling prevention device may be installed inside the pipe by attaching it to the flange joint or Victorique type pipe joint during pipe connection work.In this case.

Claims (4)

[Claims] (1) A ring-shaped body made of a copper-based metal body, which can be brought into contact with key points on the inner surface of the conduit to form a ring, and which is cut off at least at one point on the circumference, and a ring-shaped body that is separated from each other at at least one point on the circumference; An aquatic organism adhesion prevention device for the inner surface of a pipe, characterized in that the device has an interconnection mechanism that interconnects the circumferential ends thereof, and at least one of the interconnection mechanisms has a ring diameter adjustment function. (2) The aquatic life for the inner surface of a pipe according to claim 1, wherein the ring-shaped main body has a protrusion or recess on its outer circumferential surface that engages with a recess or protrusion on the inner surface of the pipe. Anti-adhesion tool. (3) The interconnection mechanism having the ring diameter adjustment function,
Claim 1, characterized in that the ring-shaped main body has wedges that push apart mutually facing circumferential ends.
The device for preventing adhesion of underwater organisms for the inner surface of a pipe according to item 1 or 2. (4) The interconnection mechanism having the ring diameter adjustment function,
3. The aquatic organism adhesion preventive device for the inner surface of a pipe according to claim 1 or 2, further comprising a turnbuckle for adjusting the interval between circumferential ends of the ring-shaped main body facing each other.