JP2022168482A - Socket for repairing bridge-suspending cable protection tube - Google Patents

Abstract

To provide a socket for repairing usable for repairing a bridge-suspending cable protection tube by a PIT new conduit method.SOLUTION: In a socket S for repairing that is used for connecting a cable protection tube 10 suspended in a bridge when removing and repairing deteriorated portions of the cable protection tube 10, and having a rib-shaped stopper 2 on an outer periphery of a cylindrical portion 1, the cylindrical portion 1 has structure in which a carbon fiber reinforced plastic layer 11 excellent in strength and rigidity and a glass fiber reinforced plastic layer 12 that is inexpensive and easy to mold are laminated. Thereby, even if a thickness of the cylindrical portion 1 is reduced so that it can be inserted into a gap between the cable protection tube 10 and an inner insertion tube 20, strength and rigidity are ensured. In addition, due to the properties of fiber-reinforced plastic, it is significantly lighter than steel-made one and does not rust, so it is excellent in workability and good durability.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to a socket for repairing a cable protection tube which is attached to a bridge through which a cable such as a communication cable is inserted.

In general, when a cable such as a communication cable is laid along a bridge, the cable is protected by being passed through a cable protection tube. Such cable protection tubes are often made of steel, but cable protection tubes are exposed to wind and rain, temperature changes, and are subject to their own weight and external forces. Deterioration such as cracking progresses. In particular, stress due to its own weight or external force tends to concentrate on a portion near a support portion such as an abutment, and deterioration tends to progress.

The deteriorated portion of the cable protection tube is removed during maintenance work and replaced with a repair tube. Patent documents 1 to 3 below describe repair sockets having rib-shaped stoppers on the outer periphery of the cylindrical portion as components of the repair pipe material used at this time.

In the repair socket described in Patent Document 1 below, both the cylindrical portion and the stopper are presumed to be made of the same steel as the cable protection tube. It is made of glass fiber reinforced plastic with excellent corrosion resistance. Further, in the repair socket described in Patent Document 3 below, the cylindrical portion is made of fiber-reinforced plastic, and the stopper is made of rubber to protect the end portion of the cable protection tube.

When repairing the deteriorated part of the cable protection tube near the wall surface of the abutment with these repair sockets, after removing the deteriorated part of the cable protection tube facing the outer wall surface of the abutment, One end of the cylindrical part is inserted into the inside of the cable protection tube, the stopper is brought into contact with the outer wall surface of the abutment, and the other end of the cylindrical part is piped into the existing cable protection tube that is crossed in the air on the opposite side of the abutment. Connect via joints or half repair pipes.

On the other hand, as a technique for regenerating a cable protection tube buried in the ground, as shown in FIG. A PIT (Pipe Insertion Type) new pipeline system is sometimes adopted in which the pipe is inserted into the pipe and regenerated.

The inner intubation tube 20 has a structure in which not only the existing accommodation space 21 for the cable C but also two new accommodation spaces 22, 22 can be created by partitioning the inside with thin tubes. In addition, the inner tube 20 is divided into an upper tube portion 20a and a lower tube portion 20b so that the existing cable C can be accommodated in the accommodation space 21 without being cut. 20a and the lower tube portion 20b are combined.

JP-A-1-322003 Japanese Unexamined Patent Application Publication No. 2006-191717 JP-A-2016-59116

By the way, the new PIT conduit method is being adopted not only for regenerating cable protection pipes buried underground, but also for regenerating cable protection pipes attached to bridges. ing.

However, currently manufactured repair sockets made of fiber-reinforced plastic have a thick cylindrical portion, so a new conduit is formed inside the existing cable protection pipe embedded in the abutment. It cannot be inserted into the gap of the inner intubation tube, and if the tube thickness of the cylindrical portion is reduced, there is a risk that sufficient strength and rigidity cannot be secured.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a repair socket that can be used for repairing bridge-attached cable protection pipes by the PIT new conduit system.

In order to solve the above problems, the present invention is used for connecting a cable protection tube when removing and repairing a deteriorated portion of the cable protection tube attached to a bridge. In a repair socket shaped to have a rib-shaped stopper,
The cylindrical portion is composed of a carbon fiber reinforced plastic layer and a glass fiber reinforced plastic layer, and has a structure in which these layers are laminated.

Further, the cylindrical portion is formed by winding and laminating a sheet material forming the carbon fiber reinforced plastic layer and a sheet material forming the glass fiber reinforced plastic layer.

Also, the stopper is made of rubber having softer elasticity than the cylindrical portion, and is adhered to the outer circumference of the cylindrical portion.

Also, the thickness of the cylindrical portion is set to 1.5 mm or more and 2.5 mm or less.

Then, the cylindrical portion and the stopper are composed of a pair of halved pipes divided into two, and the pair of halved pipes are butted against each other.

In the repair socket according to the present invention, the cylindrical portion has a structure in which a carbon fiber reinforced plastic layer with excellent strength and rigidity and a glass fiber reinforced plastic layer that is inexpensive and easy to mold are laminated, so the pipe thickness can be reduced. Strength and rigidity are ensured even if

For this reason, the cylindrical part can be inserted into the gap between the existing cable protection pipe embedded in the abutment and the inner pipe that forms a new conduit, and it can be used for repairing the bridge attached cable protection pipe by the PIT new conduit method. be able to.

In addition, due to the properties of fiber-reinforced plastic, it is significantly lighter than steel and does not rust, so it has excellent workability and good durability even in environments where corrosion is likely to progress, such as near the coast or in cold regions. can be obtained.

(1A) perspective view, (1B) XX cross-sectional view of (1A) showing a repair socket according to an embodiment of the present invention (2A) perspective view, (2B) XX cross-sectional view of (2A) showing the separated state of the pair of half pipes of the same The perspective view which shows the process which inserts a socket for a repair same as the above into an abutment side. The perspective view which shows the state which inserted the socket for repair same as the above into the abutment side. Cross-sectional view of the pipe axis direction of the same XX sectional view of FIG. 5 same as above A perspective view showing the process of connecting cable protection tubes on the same abutment side and the opposite side. The perspective view which shows the connection state of the abutment side same as the above and the cable protection tube of the opposite side. Schematic diagram showing the regeneration method of the cable protection tube using the new PIT conduit method

Embodiments of the present invention will be described below with reference to the accompanying drawings.

A socket S shown in FIG. 1 is used to connect a cable protection tube when removing and repairing a deteriorated portion of the cable protection tube attached to a bridge. It is shaped to have a stopper 2 .

The cylindrical portion 1 is composed of a carbon fiber reinforced plastic layer 11 on the inner surface side and a glass fiber reinforced plastic layer 12 on the outer surface side, and has a structure in which these are laminated. Carbon fiber reinforced plastic (CFRP) has excellent properties of strength and rigidity, and glass fiber reinforced plastic (GFRP) is inexpensive and easy to mold.

In manufacturing the cylindrical portion 1, a sheet material forming the carbon fiber reinforced plastic layer 11 and a sheet material forming the glass fiber reinforced plastic layer 12 are wound and laminated by a sheet winding method.

Unlike the filament winding method (FW method), the sheet winding method (SW method) is a method in which a sheet-like prepreg (intermediate material) is wound around a core mold and molded. It is possible to make pipes with strength properties.

The stopper 2 is made of rubber having softer elasticity than both the carbon fiber reinforced plastic layer 11 and the glass fiber reinforced plastic layer 12 of the cylindrical portion 1 . This prevents the contacting target surface from being scratched.

As shown in FIG. 2, the socket S consists of a pair of half pipes 3, 3 in which the cylindrical portion 1 and the stopper 2 are divided into two in the circumferential direction, and these are butted together. A mountain-shaped engaging ridge 4 is formed on one side of the abutting portion of the half-split tube 3 so as to extend in the pipe axial direction, and a V-shaped engaging groove 5 is formed on the other side. In some cases, the engaging ridges 4 and the engaging grooves 5 are omitted, and the abutting portion of the half tube 3 has a flat surface.

3 to 8 show the process of repairing the cable protection tube 10 attached to the bridge and through which the cable C is inserted, using the socket S as described above.

For this repair, the PIT new pipeline method is adopted as a construction method for regenerating pipelines. In the initial process, as shown in FIG. 3, the deteriorated portion of the cable protection tube 10 near the wall surface of the abutment A is removed, and the polyvinyl chloride is placed inside the existing cable protection tube 10 embedded in the abutment A. A new internal intubation tube 20 manufactured by the manufacturer is inserted.

In this state, the inner tube 20 through which the cable C is inserted is surrounded from the left and right by the pair of half tubes 3 of the socket S, and the pair of half tubes 3, 3 are butted against each other, and the engaging ridge 4 and the engaging groove 5 are engaged with each other. When the engaging ridges 4 and the engaging grooves 5 are omitted, the flat abutting portions of the half pipes 3 are butted against each other.

Then, as shown in FIG. 4, the cylindrical portion 1 of the socket S is inserted from one end into the gap between the existing cable protection tube 10 embedded in the abutment A and the inner tube 20, and the cable exposed on the wall surface of the abutment A is inserted. The stopper 2 is brought into contact with the end surface of the protective tube 10 .

_In this embodiment, the actual dimensional relationship will be explained with reference to _FIGS . is 72 mm. Under this dimension, the inner diameter d1 of the cylindrical portion ₁ is set to 75 (+0.3/-0.5) mm in order to securely insert the cylindrical portion 1 of the socket S into the gap between the cable protection tube 10 and the inner tube 20. , the outer diameter D ₁ is 79 (+0.3/−0.5) mm, and the thickness of the cylindrical portion 1 is 1.5 mm or more and 2.5 mm or less.

As a result, σ・Z, which is the product of stress and section modulus of the socket S, is 945 N・m or more, which is equivalent to the current product used in the repair method of bridge-mounted cable protection pipes other than the PIT new conduit method. performance is ensured.

After inserting the socket S into the cable protection tube 10 on the side of the abutment A, as shown in FIG. One end of the cable protection tube 10 is inserted into the cable protection tube 10, and the stopper 2 is brought into contact with the end surface of the cable protection tube 10. - 特許庁At this time, if the inner tube 20 is inserted into the existing aerial cable protection tube 10 , the cylindrical portion 1 of the socket S is inserted into the gap between the cable protection tube 10 and the inner tube 20 .

Subsequently, as shown in FIG. 8, a pair of sockets S is connected between the cylindrical portion 1 of the socket S inserted into the cable protection tube 10 on the side of the abutment A and the cylindrical portion 1 of the socket S inserted into the existing cable protection tube 10 in the air. The half repair pipe 30 is assembled so as to be held from above and below, and both ends of the half repair pipe 30 are brought into contact with the stoppers 2 of the respective sockets S to position them in the pipe axial direction.

Finally, in the portion between the sockets S on both sides, a tightening tool 40 such as a stainless steel band is wrapped around the outer circumference of the half repair pipe 30, the half repair pipes 30 are tightened with the tightening tool 40, and the existing cable is installed. The protection tube 10 and the half repair tube 30 are integrated through the socket S.

In the repair socket S as described above, the cylindrical portion 1 has a structure in which a carbon fiber reinforced plastic layer 11 having excellent strength and rigidity and a glass fiber reinforced plastic layer 12 which is inexpensive and easy to mold are laminated. Even if the pipe thickness is made thin, strength and rigidity are ensured.

For this reason, the cylindrical portion 1 can be inserted into the gap between the existing cable protection pipe 10 embedded in the abutment A and the inner insertion pipe 20 forming a new conduit, and the bridge attached cable protection pipe 10 by the PIT new conduit method. can be used to repair

In addition, due to the properties of fiber-reinforced plastic, it is significantly lighter than steel and does not rust, so it has excellent workability and good durability even in environments where corrosion is likely to progress, such as near the coast or in cold regions. can be obtained.

A Abutment C Cable S Socket 1 Cylindrical portion 2 Stopper 3 Half tube 4 Engagement ridge 5 Engagement groove 10 Cable protection tube 20 Inner tube 20a Upper tube 20b Lower tube 21, 22 Storage space 11 Carbon fiber reinforced plastic layer 12 Glass fiber reinforced plastic layer 30 Half repair pipe 40 Fastener

Claims (5)

It is used to connect the cable protection tube (10) when removing and repairing the deteriorated portion of the cable protection tube (10) attached to the bridge, and has a rib-like shape on the outer circumference of the cylindrical part (1). In a repair socket (S) shaped to have a stopper (2) of
Said cylindrical part (1) is composed of a carbon fiber reinforced plastic layer (11) and a glass fiber reinforced plastic layer (12), and has a structure in which these are laminated. socket for repair. In the cylindrical portion (1), a sheet material forming the carbon fiber reinforced plastic layer (11) and a sheet material forming the glass fiber reinforced plastic layer (12) are wound and laminated. The socket for repairing the bridge-mounted cable protection tube according to claim 1, characterized in that: 3. The stopper (2) according to claim 1 or 2, wherein the stopper (2) is made of rubber having softer elasticity than the cylindrical portion (1) and is adhered to the outer circumference of the cylindrical portion (1). Socket for repairing bridge-attached cable protection tubes. 4. The socket for repairing a bridge-attached cable protection tube according to any one of claims 1 to 3, wherein the cylindrical portion (1) has a thickness of 1.5 mm or more and 2.5 mm or less. The cylindrical portion (1) and the stopper (2) are composed of a pair of half pipes (3) divided into two, and the pair of half pipes (3) are butted against each other. A socket for repairing a bridge-attached cable protection tube according to any one of claims 1 to 3.

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