JPH11270765A - Corrugated tube - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a corrugated tube that can be quickly arranged without changing the position. SOLUTION: A concave portion 2A and a convex portion 2B are alternately provided on the outer surface, and they are formed in an annular or spiral shape. The cross-sectional shape of the convex portion 2B is square, and the cross-sectional shape of the concave portion 2A. Is provided with a female joint part 3 having a diameter larger than that of the male joint part 4 at one end of the pipe main body 2 formed in a circular shape so as to be able to be inserted into the male joint part 4 at the other end. A ring member 7 for preventing the movement of the two joints 3 and 4 toward the fitting / removing side after the insertion of the two joints 3 and 4 by entering a groove 4D formed on the surface of one joint 4; It is characterized in that the other joint portion 3 is provided with a seal member 8 that is pressed and deformed in the radially expanding direction with the insertion of 3, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for burying underground.
In addition, the present invention relates to a corrugated pipe disposed inside or outside a building, under a bridge, under an overpass, or the like to protect an optical fiber cable, a power line, and the like.

[0002]

2. Description of the Related Art A corrugated tube generally has concave portions and convex portions alternately formed on an outer surface thereof, and is generally formed in an annular or helical shape. It was done. If the corrugated tube is made of synthetic resin, it can tolerate some bending,
In the curved path, for example, the corrugated pipe can be disposed along the curved path only by bending the corrugated pipe without using a special corrugated pipe formed in a curved shape.

Conventionally, since the corrugated tube has a circular cross section, the following inconvenience has occurred.

That is, since the tube is circular, it is easy to rotate around the center of the tube axis, the position of the corrugated tube may move unexpectedly, and it is necessary to perform positioning again when connecting the tubes. It was disadvantageous in handling. In particular, when a large number of pipes are stacked vertically and horizontally and then buried with earth and sand, the pipes are largely displaced due to the earth and sand, and it may not be possible to arrange the pipes as planned.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has as its object to provide a corrugated tube which can be installed quickly without changing its position.

[0006]

According to the present invention, in order to solve the above-mentioned problems, concave portions and convex portions are alternately provided on the outer surface, and
They are formed in an annular or helical shape, and the cross-sectional shape of the convex portion is rectangular, and the cross-sectional shape of the concave portion is formed at one end of a pipe body and at the other end at a male joint portion. A female joint having a larger diameter than the joint is provided so that the joint can be inserted into the joint. The other joint portion is provided with a ring member that enters and blocks the formed groove portion and a seal member that is pressed and deformed in the radially expanding direction when the two joint portions are inserted. Therefore, since the cross-sectional shape of the convex portion is square, it is possible to make surface contact with the mounting surface, it is possible to dispose it stably, and it is necessary to rotate around the pipe axis as in the prior art. Can be reliably prevented from being changed. Also, when arranging and embedding a large number of corrugated pipes vertically and horizontally, the corrugated pipes can be placed in close contact with each other, and if they are filled, they will be installed without being affected by sediment. It will be possible to do it. In addition, since the cross-sectional shape of the concave portion is formed in a circular shape, the contact area can be reduced when a cable or the like is inserted into the pipe, and the cable or the like can be inserted into the pipe with a small movement resistance. Can be. When connecting the pipes, a female joint provided at one end of the pipe main body and a male joint provided at the other end of the pipe adjacent to this in the pipe axis direction are provided. By the insertion, the ring member enters the groove, and the movement of the two to the fitting / removing side is prevented, and the sealing member is pressed and deformed in the radially expanding direction to be in a state where both are sealed, The connection between the tubes is completed.

By providing the ring member and the seal member on the inner surface of the joint having the large diameter, the ring member and the seal member can be deformed in the diameter reducing direction and set quickly. Moreover, when moving or transporting the corrugated tube provided with the ring member and the seal member,
Contact with another object can be avoided, and deformation, breakage, detachment, and the like accompanying the contact can be reliably avoided.

By forming the tip of the small-diameter joint portion into a tapered shape, the pipes can be connected smoothly without strictly aligning the pipes.

By integrally forming the joints at both ends of the pipe main body, the number of manufacturing steps can be reduced as compared with the case where the separately formed joints are attached to the pipe main body.

A helical pipe portion into which the joint portion formed separately can be externally fitted by screwing is formed integrally with both ends of the pipe main body, and an inner surface of a concave portion of the pipe main body and the pipe are formed. By setting the inner surface of the concave part of the part to the same level in the pipe axis direction, the drying time of the adhesive is not required as compared with the case where the joint part is fixed with adhesive etc. Not only can a joint portion be provided, but also a cable or the like can be smoothly inserted without being caught in the pipe when the cable or the like is inserted into the pipe.

[0011]

1A and 1B show a corrugated tube 1 made of synthetic resin. This corrugated tube 1
The tube body 2 is provided with a concave portion 2A and a convex portion 2B on its outer surface and formed in a ring shape, and joints 3 and 4 provided at both ends of the tube body 2. In FIG. 1A, the concave portion 2A and the convex portion 2B are formed in a ring shape, but they may be formed in a spiral shape. When the corrugated tube 1 is made of a synthetic resin, it has flexibility, so that vibration generated by an earthquake or the like can be favorably absorbed. However, any material such as metal, ceramic, and hard rubber can be used. It may be composed of

As shown in FIG. 1B, the convex portion 2B is formed in a square shape (square) in cross section, so that the stability can be improved. The concave portion 2A is formed in a circular cross section so that a cable or the like can be smoothly inserted into the pipe.
Further, the four corners 2R of the convex portion 2B are formed in an arc shape so that other objects do not get caught on the corners 2R.

At both ends of the tube main body 2, tube portions 5 into which the joint portions 3 and 4 can be fitted are integrally formed to protrude. These pipe portions 5 and 5 have a circular cross section, in which concave portions 5A and convex portions 5B are alternately formed, and are spirally formed so that the joint portions 3 and 4 can be screwed in and mounted. It is composed.

As shown in FIGS. 2 to 4, the one joint portion 3 has an inner diameter equal to or larger than the outer diameter of the tube portion 5, and is screwed from one end of the tube portion 5. A helical base end 3A that can be externally fitted and fixed, and can be externally inserted into the other joint 4 provided at one end of the corrugated pipe 1 that is provided continuously from the base end 3A and that is adjacent in the pipe connection direction. It is configured as a female joint having a tip 3B.

The other joint portion 4 has an outer diameter equal to or larger than the outer shape of the tube portion 5.
A base end portion 4A which can be screwed into the outside and fixed to the outside, and a corrugated tube 1 continuously provided from the base end portion 4A and adjacent in the tube connection direction.
And a tip 4B that can be inserted into the one joint 3 provided at one end of the male joint. Reference numeral 6 shown in FIGS. 2 to 4 is a synthetic resin or rubber seal member for sealing between the pipe part 5 and the joint part 3 or 4. A tapered portion 4C having an outer diameter smaller than the outer diameter of the distal end portion is formed at the distal end of the distal end portion 4B of the male joint portion 4, and the tapered portion 4C is formed on the distal end of the distal end portion 3B of the female joint portion 3 outside. By forming the outer expanding portion 3 </ b> C that expands in the direction of the arrow, the fitting portions 3 and 4 can be easily and quickly inserted into each other.

Two circumferential grooves 3D and 3E are formed on the inner surface of the distal end portion 3B of the female joint portion 3, and the distal end portion of the male joint portion 4 is formed in one peripheral groove 3D located on the distal end side. A ring member 7 that fits into a circumferential groove 4D, which is a groove formed on the outer surface of 4B, is fitted. Also, the other circumferential groove 3E
An annular seal member 8 which is pressed against the outer surface of the distal end portion 4B of the male joint portion 4 to seal between the joint portions 3 and 4.
Is fitted. Therefore, by inserting and inserting the two joint portions 3 and 4, the sealing member 8 receives the pressure contact force from the outer surface of the distal end portion 4B of the male joint portion 4 and deforms by pressing in the radially expanding direction, thereby sealing the two. Seal in a state. And
When the ring member 7 fits into the circumferential groove 4D during the insertion, the insertion of the joint portions 3 and 4 is prevented at that position, and the connection between them is completed.

By separately configuring the ring member 7 and the seal member 8, the hardness of the ring member 7 and the seal member 8 is set to an optimum value, thereby preventing the joint portions 3 and 4 from coming off and sealing. Can be surely demonstrated. Specifically, it is optimal to set the hardness of the ring member 7 in a range of, for example, 80 degrees to 95 degrees, and set the hardness of the seal member 8 in a range of, for example, 20 degrees to 40 degrees. The ring member 7 and the seal member 6 are made of synthetic resin, synthetic rubber, or the like.

In the above embodiment, the inner surface 5a of the concave portion 5A of the tube portion 5 is formed so that the inner surface 5a of the concave portion 5A of the tube portion 5 projects inward from the inner surface 2a of the concave portion 2A of the tube main body 2, so that a cable or the like is inserted into the corrugated tube. Vertical wall 5 connecting the pipe body 2 and the pipe at the time
Although a cable or the like may be hooked on K, as shown in FIG. 5, the inner surface 2a of the concave portion 2A of the tube main body 2 and the inner surface 5a of the concave portion 5A of the tube portion 5 are at the same level in the tube axis direction. Thus, it is possible to reliably prevent the cable or the like from being caught when the cable or the like is inserted into the corrugated pipe. The other configuration shown in FIG. 5 is the same as the configuration shown in the above embodiment, so the same reference numerals are given and the description is omitted.

In the above embodiment, the joints 3 and 4 formed separately are screwed into the pipe main body 2 and mounted, thereby eliminating the need for the adhesive and the bonding step. The pipe part 5 is formed as a circular straight pipe, and the joint parts 3 and 4 are formed as straight pipes having a size that can be fitted to the straight pipe 5, and these are bonded and fixed using an adhesive. You may do so. Further, as shown in FIGS. 6 to 8, the joints 3 and 4 are integrally formed at both ends of the pipe main body 2, so that the cost can be reduced by reducing the number of manufacturing steps. Specifically, by forming the distal end portions 3B, 4B of the joint portions 3, 4 integrally at both ends of the pipe body 2, the joint portions 3, 4 are formed.
It is also possible to eliminate the need for the sealing member 6 between the tube body 2 and the pipe. The other configurations shown in FIGS. 6 to 8 are the same as the configurations shown in the above-described embodiment, and therefore, are denoted by the same reference numerals and description thereof will be omitted.

[0020]

According to the first aspect, the cross-sectional shape of the convex portion of the corrugated tube can be made to be in surface contact with the mounting surface by making the cross-sectional shape of the convex portion, so that the arrangement can be performed stably. It is possible to reliably prevent the position from being changed by rotating about the tube axis as in the related art, and the arrangement of the corrugated tube can be speeded up. Also, when a large number of corrugated pipes are laid and buried vertically and horizontally, the corrugated pipes can be arranged in close contact with each other. There is an advantage that the installation can be performed as scheduled without receiving. In addition, since the cross-sectional shape of the concave portion is formed in a circular shape, the contact area can be reduced when a cable or the like is inserted into the pipe, and the cable or the like can be inserted into the pipe with a small movement resistance. When connecting the pipes, a female joint provided at one end of the pipe main body and a male joint provided at the other end of the pipe adjacent thereto in the pipe axis direction are provided. By simply inserting the parts, the connection between the pipes can be completed in a state where the retaining process and the sealing process have been performed.

According to the second aspect of the present invention, the ring member and the seal member are provided on the inner surface of the large-diameter joint portion, so that the ring member and the seal member are provided on the outer surface of the joint portion. Can be quickly set by being deformed in the diameter reducing direction. Moreover, when moving or transporting the corrugated tube provided with the ring member and the seal member, contact with other objects can be avoided by the strong tube itself, and the accompanying deformation, breakage, or detachment can be prevented. It can be avoided reliably.

According to the third aspect of the invention, by forming the tip of the joint having a small diameter into a tapered shape, the pipes can be connected smoothly without strictly aligning the pipes. The time for connecting the tubes can be reduced.

According to the fourth aspect, the joint portion is integrally formed at both ends of the pipe main body, so that the number of manufacturing steps can be reduced as compared with a case where a separately formed joint portion is attached to the pipe main body. This is advantageous in terms of cost.

According to the fifth aspect, a helical pipe portion into which the separately formed joint portion can be externally fitted by screwing is integrally formed at both ends of the pipe main body, and the helical pipe portion is formed integrally with the pipe main body. By setting the inner surface of the concave portion and the inner surface of the concave portion of the tube portion at the same level in the tube axis direction, drying time and the like of the adhesive are not required as compared with the case where the joint portion is fixed with an adhesive or the like, so that it is quick and easy. Not only can be equipped with joints at both ends of the pipe body, but also can smoothly insert the cables etc. without getting caught in the pipe when inserting the cables etc. into the pipe, manufacturing work surface and field work surface It becomes advantageous in.

[Brief description of the drawings]

1A is a side view of a corrugated tube, and FIG. 1B is a cross-sectional view taken along the line II in FIG.

FIG. 2 is a cross-sectional view of a corrugated tube.

FIG. 3 is a partial cross-sectional side view showing a connection portion before connection between corrugated tubes.

FIG. 4 is a cross-sectional view showing a connection portion in a state where the corrugated tubes are connected to each other.

FIG. 5 is a sectional view showing another form of a corrugated tube having a flat inner surface.

FIG. 6 is a side view showing another form of a corrugated pipe in which a pipe main body and a joint portion are integrated.

FIG. 7 is a sectional view of the corrugated tube shown in FIG. 6;

FIG. 8 is a cross-sectional view showing a connection portion connecting the corrugated tubes shown in FIG.

[Explanation of symbols]

 1 corrugated pipe 2 pipe body 2A concave 2B convex 2R corner 3,4 joint 3A, 4A proximal end 3B, 4B distal end 3C outer flared part 4C tapered part 3D, 3E peripheral groove 4D peripheral groove 5 tube 5A concave 5B Convex part 5K Vertical wall part 6 Seal member 7 Ring member 8 Seal member

Claims (5)

[Claims] 1. An outer surface comprising alternately concave portions and convex portions, which are formed in an annular or spiral shape, wherein the cross-sectional shape of the convex portion is rectangular, and the cross-sectional shape of the concave portion is circular. A female joint having a larger diameter than the joint is provided at one end of the pipe body formed at the other end so that it can be inserted into the male joint at the other end. In the other, a ring member for preventing the movement of the two to the fitting / removing side by entering into a groove formed on the surface of one joint portion and a seal member which is pressed and deformed in the radially expanding direction with the insertion of the two joint portions are used for the other. A corrugated tube provided at a joint portion of: 2. The corrugated tube according to claim 1, wherein the ring member and the seal member are provided on an inner surface of the joint having the large diameter. 3. The corrugated tube according to claim 1, wherein a tip of the joint having a small diameter is formed into a tapered shape. 4. The corrugated tube according to claim 1, wherein the joint portion is formed integrally with both ends of the tube main body. 5. A helical pipe portion, from which the joint portion formed separately can be detached by screwing, is integrally formed at both ends of the pipe main body, and an inner surface of a concave portion of the pipe main body and the helical pipe portion are formed. 2. The corrugated tube according to claim 1, wherein the inner surface of the concave portion of the tube portion is set at the same level in the tube axis direction.