JPH0369891A - Corrugated pipe - Google Patents

Abstract

PURPOSE:To easily and highly reliably connect a corrugated sheath pipe cut halfway without using a joint by cutting the middle part of a faucet part and an insertion part at a non-corrugated pipe part which is formed by a combination of a successive faucet part and insertion part at specified intervals. CONSTITUTION:A length-short sheath pipe or residual sheath pipe P1 (or P2) and a supplementary sheath pipe P2 (or p1) are both out at a stepped place of a non-corrugated pipe part to form connecting end parts, a faucet part 3, being one end part and an insertion part 4 the other end part respectively. An adhesive is applied to the inner surface of the faucet part 3 or the outer surface of the insertion part 4, and then the insertion part 4 is pressed in the faucet part 3. This enables both the P1 and P2 to be irrotationally and easily connected without using a specific joint.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a corrugated pipe, which is useful as a sheath pipe in a sheath pipe construction method.

<Conventional technology> When installing drain pipes, water supply pipes, or hot water pipes (hereinafter referred to as water supply/drainage pipes), or when wiring electric wires and cables, long sheath pipes are rolled up and transported to the site. The sheath pipe is extended along a predetermined piping route, and a supply/drainage pipe or an electric wire/cable is drawn into the extended sheath pipe.
The so-called sheath pipe construction method may be applied.

The sheath pipe used in this sheath pipe construction method must have excellent visibility so that it can be transported in a rolled form and be extended along curved routes, and be lightweight so that it can be transported in long lengths. Corrugated plastic pipes must meet requirements such as being of good quality and having excellent shape retention (resistance to pressure immersion deformability) to enable smooth pipe passage. It is lightweight and has excellent pressure resistance and deformation resistance because the ring-shaped or spiral-shaped unevenness acts as a rib against the pedal load, and satisfies the above requirements.
It is commonly used as a sheath tube.

However, as the diameter of the sheath tube increases, the length of the sheath tube is limited due to weight or roll size in terms of transportation or handling, and the length of the sheath tube is insufficient, making it unavoidable to connect the sheath tube midway. Sometimes. In addition, if the piping is short and there is a surplus of sheath tube, and the surplus sheath tube is used separately, it may be necessary to connect the sheath tube.

However, special joints are required to connect sheath tubes, and corrugated tubes in particular have uneven surfaces.
Surface smoothing treatment (each stroke, diameter enlargement, etc.) for fitting fittings
It is necessary and troublesome.

In order to eliminate this unreasonableness, as shown in Figure 9,
Corrugated bulges 2' are provided at regular intervals, one of the corrugated tubes to be connected to each other is cut at the corrugated bulge end, and the other corrugated tube end is connected to the corrugated bulge end. It has been proposed to screw it in (Utility Model Publication No. 10288, 1988).

However, in order to screw the pipes back and forth, it is necessary to rotate one pipe relative to the other, and it is difficult to rotate long pipes such as sheath pipes. This is especially true for large and heavy items. If only the end of the tube is rotated without rotating the entire tube, the tube will be forced to twist and a torsion reaction force will be generated, and this torsion reaction force will act in the direction of loosening the threaded joint. Moreover, in pipes that are transported in rolls, bending of the pipe is unavoidable, and this bending also makes the above-mentioned screw connection difficult. Furthermore, even if the connection could be made by screwing back, it would be necessary to use putty or seal tape to seal each section, making the water-stopping process troublesome. Therefore,
Even if the corrugated pipe described above does not require a conventional exchange joint, the connection work is more difficult and the reliability of the joint is lower than when such a joint is used.

An object of the present invention is to provide a long corrugated sheath tube that can be easily and reliably connected to a corrugated sheath tube cut in the middle without using a joint.

Means for Solving the Problem> The corrugated pipe according to the present invention includes non-corrugated pipe parts at regular intervals, and the non-corrugated pipe parts are separated from the socket part and the insertion part for the socket. This is a configuration characterized by the following.

<Explanation of Examples> Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a partial vertical sectional view showing an embodiment of the present invention.

In FIG. 1, 1 is a corrugated tube section.

Reference numeral 2 denotes a non-corrugated pipe portion, in which a receptacle portion 3 and an insertion portion 4 for the receptacle are connected via a step 5.

The corrugated pipe parts and the non-corrugated pipe parts exist alternately, and one corrugated pipe part and the socket part and the insertion part at both ends form one unit. The material of the tube is thermoplastic resin, such as polyvinyl chloride, polyethylene, polypropylene, etc.

The waveform of the corrugated tube portion may be either a tandem ring shape or a spiral shape as shown in FIG.

When the receptacle part and the inlet part are separated by cutting the stepped part, as shown in Figure 2, adhesive (not shown) can be used.
There is a dimension relationship that allows insertion connection via the third
As shown in the figure, it is preferable that the socket part 3 has a tapered tubular shape, with the inner diameter becoming smaller as it reaches the probe.The diameter of the joint is between the diameter of the peak and the diameter of the valley of the corrugated pipe. It is desirable to set the dimensions.

The corrugated pipe according to the present invention is transported and stored in a roll according to the number of bundles, and used as a sheath pipe in the sheath pipe construction method. In this case, if the length of the roll is insufficient compared to the length of the pipe, even if relatively short pipe surplus material is used, the specified connection can be made by plug-in connection without using a joint, as shown in Figure 2. It can be a sheath tube with a length of piping. In Figure 2, P
, (or P2) is a sheath pipe with insufficient length or a surplus sheath pipe P2
(or p t ) is a supplementary sheath pipe, and both sheath pipes are connected by cutting the step part of the non-corrugated pipe part, and the socket part 3 is used as one end, and the socket part 3 is used as the connection end. The part 4 is the other end, and the inner surface of the socket part 3 or the socket part 4
If an adhesive is applied to the outer surface of the connector and the insertion part 4 is press-fitted into the socket part 5, the connection can be easily made in a non-rotating manner without using a reciprocating joint.

In addition, the shapes of the tip of the socket part 3 and the tip of the insertion part 4 are smaller in diameter than the diameter of each non-corrugated pipe part, as shown in Fig. 3. By doing so, it can be easily inserted during connection and difficult to remove.

The method for extending the sheath pipe is as follows: (a) As shown in Figure 4A, the end of the winding end of the sheath pipe roll A that is insufficient in length and the beginning end of the supplementary sheath pipe roll B are connected to the socket/insertion method described above. Connected by supplementary sheath tube scroll B
A method of letting out the sheath pipe from the winding end b2 and extending it along the piping route. (B) As shown in Fig. 4B, after finishing unwinding the insufficient sheath pipe A, add supplementary wire to the rear end. A method of connecting the winding end b2 of the sheath tube roll B by the above-mentioned socket-insertion method, and further extending the sheath tube along the piping route, (c) as shown in FIG. 4C, After finishing the unwinding and wire stretching of the insufficient sheath pipe A, transport the supplementary sheath pipe roll B to the end of the wire extension a, and transfer the winding start end of this roll B to the end of the wire extension a of the insufficient sheath pipe as described above. A method may be used in which the connection is made by a socket insertion method, and then the sheath tube is drawn out from the winding end b2 of the supplementary sheath tube roll B and the wire is extended. In any case, if the end of the wire extension is a manhole, the end may be used as a socket part, and this part may be inserted and connected to the duct opening pipe of the manhole.

When implementing the above construction method, it is necessary to cut the step part of the non-corrugated pipe part of each roll to make a connection end, so cut pieces are generated, and these cut pieces become a loss.
It is advantageous to shorten the length Q, 1 of the corrugated tube portion. On the other hand, the length Q2 of the non-corrugated tube section, that is, the non-flexible section, should be shorter than the corrugated tube section. Therefore, the length Q2 of the corrugated tube section,
It is advantageous to lengthen the length to ensure overall flexibility.

Therefore, the ratio of the corrugated pipe length to the non-corrugated pipe length is Q, 2/Q.
1 is set taking these points into consideration, and is usually 0.3 to 0.
It is 02.

In addition, when constructing piping of a predetermined length, the length Q8 of the corrugated pipe part is short when supplementing the insufficient length of each roll, and when adjusting the length by cutting each roll appropriately. The length is preferably 15 to 150 cm.

Figure 6B, Figure 7B, Figure 8B for the socket/insertion method above.
The connection work can be further simplified by using the O-ring method shown in Figure 2. Therefore, the shapes and dimensions of the socket and socket parts in the non-corrugated pipe section are similar to those for socket and socket connections. 6A, 7A, and 8A can also be used to make this possible.

In addition, the above-mentioned construction method (
In the case of (a) and (b), it is necessary to provide a pull-out strength that can withstand the tension of the sheath tube. Figure B,
It is effective to provide a locking pawl 31 at the tip of the socket as shown in FIG. 7B and FIG. 8B (O-ring method), and correspondingly, As shown in FIGS. 7A and 8A, a fairly large step 51 for the claw can be provided in the non-corrugated tube section.

In the above construction, it is desirable to stamp a measuring mark on the non-corrugated pipe part in order to easily manage the length of the surplus sheath pipe roll and supplementary sheath pipe roll, and also mark the nominal diameter, company name, or It is also possible to engrave a house mark etc. It is also effective to set the spacing between the non-corrugated tube sections so that the dimensions can be determined by simply counting the number of non-corrugated tube sections.

To manufacture the corrugated tube according to the present invention, for example, a roller die for corrugation and a roller die for forming a socket/insertion are disposed between the mouthpiece of an extruder and a cooling tank, and these roller dies are extruded. A method can be used to control attachment to and detachment from the pipe.

<Effects of the Invention> As described above, the corrugated pipe according to the present invention is provided with a non-corrugated pipe part in which a socket part and an insertion part are successively formed at predetermined intervals. By cutting the intermediate part between the part for use and the part for insertion, it is possible to connect the sheath pipe to a socket/insertion when the length is insufficient when piping the sheath pipe, to use leftover material from the sheath pipe, or to connect it to a manhole opening. It can be made using the mouth method, does not require a special joint, does not require the rotation of the sheath pipe when connecting the pipe, and also does not require filling the valleys with putty or sealing tape, making the connection quick and easy. It can be carried out.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams showing the connection state of the corrugated pipe of the present invention, and FIGS. 4A, 4B, and 4 Figure C is an explanatory diagram showing the sheath pipe wire extending method using the corrugated pipe of the present invention, and Figure 5A
, FIG. 6A, FIG. 7A, and FIG. 8A are explanatory diagrams showing other embodiments of the present invention, and FIG. 5B, FIG. 6B, FIG. 7B, and FIG. An explanatory diagram showing the connection state of the corrugated pipe according to the above-mentioned another embodiment, and FIG. 9 is an explanatory diagram showing a conventional example. 1... Corrugated pipe part 2... Non-corrugated pipe part 3... Portion for socket 4...
Insertion part part q

Claims (1)

[Claims] A corrugated tube characterized in that non-corrugated tube portions are provided at regular intervals, and the non-corrugated tube portions are comprised of a socket portion and an insertion portion for the socket.