JPH1194148A - Connecting member of pipe with spiral waves and connecting method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain waterproofness without a tape winding and perform a connecting work even in narrow space easily and in a short time. SOLUTION: A connecting member constituted of a connecting sleeve 1, a rubber tubular packing 2 and fastening rings 3A, 3B is used. In the rubber tubular packing 2, an intermediate part of the longitudinal direction is put on the outer periphery of the connecting sleeve 1 and both the end parts are folded on the intermediate part. The connection is performed as follows. (1) The fastening rings 3A, 3 B are preliminarily screwed and fitted into the tip parts of pipes with spiral waves to be connected. (2) The connecting sleeve 1 is screwed and fitted so as to stride over the tip parts of both the pipes with spiral waves. (3) Both the end parts of the rubber tubular packing 2 are put on the pipes with spiral waves on both end sides of the connecting sleeve 1 and (4) The fastening rings 3A, 3B are screwed back and the rubber tubular packing 2 is pressed on the pipes with spiral waves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection member for a tube with a spiral wave and a method for connecting a tube with a spiral wave using the same.

[0002]

2. Description of the Related Art A corrugated pipe made of plastic is widely used as an electric conduit. The corrugated tube includes a spiral corrugated tube having a spiral waveform and an independent corrugated tube having a circular waveform.
Conventionally, connection of a tube with a spiral wave has been performed as follows.

[0003] A connection sleeve having a spiral waveform that is screw-fitted to the outer peripheral surface of a tube with a spiral wave to be connected, a sealing tape, and a holding tape are prepared. The entire length of the connection sleeve is screw-fitted to the outer periphery of the end of one of the spiral-wave tubes. After matching the open ends of both spiral wave tubes,
The connection sleeve is unscrewed by half the length so that the connection sleeve straddles both spiral corrugated tube ends.
This mechanically connects the two spiral tubes. A waterproofing treatment is performed by wrapping a sealing tape so as to straddle both ends of the connection sleeve and a tube with a spiral wave in the vicinity thereof. The holding tape is wound so as to straddle the sealing tape winding portion, the connection sleeves on both ends thereof, and the tube with a spiral wave to ensure waterproofness.

[0004]

The connection portion of the conventional spiral wave tube constructed as described above has no problem in terms of the pull-out strength of the spiral wave tube, but there is an individual difference in how the tape is wound. Since it is likely to occur, the waterproofness may be impaired if an inexperienced worker constructs it. Also, when connecting multiple corrugated pipes in a narrow groove such as an underground conduit, the gap between the pipes is so narrow that it is very difficult to perform tape winding work. However, it is difficult to ensure sufficient waterproofness. There is also a problem that the tape winding operation takes time.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a connecting member for a spiral-wound tube, which is capable of obtaining reliable waterproofness with a simple operation and shortening the operation time. The object of the present invention is to provide a connection method that uses a password.

[0006]

According to the present invention, there is provided a connecting member comprising: a connecting sleeve having a spiral waveform which is screw-fitted to an outer peripheral surface of a tube with a spiral wave to be connected; Longer, the circumferential length is shorter than the outer circumferential length of the spiral wave tube, an intermediate portion in the length direction is covered on the outer circumference of the connection sleeve, and is fixed to the connection sleeve by its own elastic contraction force, and both ends are the intermediate length. A rubber tube-like packing folded or wound back to the outside of the portion, and a spiral waveform that presses both ends of the rubber tube-like packing covered on the spiral wave tube against the outer peripheral surface of the spiral wave tube. It is characterized by comprising a pair of tightening rings.

The method for connecting a spiral wave tube according to the present invention using the connecting member includes a step of screwing a tightening ring in advance to each end of the spiral wave tube to be connected, A connection sleeve in which a tubular packing is covered with both ends folded or unwound,
Screw-fitting so as to straddle both ends of the spiral tube to be connected; covering both ends of the rubber tube-shaped packing on the spiral tube at both ends of the connection sleeve; the tightening ring Screwing both ends of the rubber tube-shaped packing back onto both ends of the rubber tube-shaped packing, and pressing both ends of the rubber tube-shaped packing onto a tube with a spiral wave.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. [Embodiment 1] FIG. 1 shows an embodiment of a pipe connection member with a spiral wave according to the present invention. This connecting member includes a connecting sleeve 1, a rubber tubular packing 2, and a pair of tightening rings 3A, 3B.

The connection sleeve 1 has a spiral waveform that is screw-fitted to the outer peripheral surface of a tube with a spiral wave to be connected. The length of the connection sleeve 1 is about 5 to 7 pitches in the form of a waveform, and the inner diameter is 0 when the gap between the outer peripheral surface of the tube with the spiral wave is 0.
It is set to about 2 mm. The material is the same plastic as the spiral wave tube.

The rubber tube-shaped packing 2 has a length of about 1.5 to 2 times that of the connection sleeve 1 and has a circumference shorter than the outer circumference of the spiral tube. The rubber tube-shaped packing 2 has a connection sleeve 1 at an intermediate portion in the length direction.
Of the connection sleeve 1 by its own elastic contraction force.
And both ends are folded back to the outside of the intermediate portion. Rubber tube packing 2
Are the portions that are put on the spiral-wound tubes on both ends of the connection sleeve 1 by turning back.
When put on the spiral tube, the elastic tube contracts with its own elastic contraction force.

Each of the pair of tightening rings 3A and 3B has a helical waveform having the same pitch as that of the helical tube to be connected, and the inner peripheral surface thereof is covered with a rubber tube covered by the helical tube. The packing is formed so that it can be pressed tightly against the spiral-wound tube.

Next, a method of connecting a tube with a spiral wave using the connecting member constructed as described above will be described with reference to FIG. FIG. 2 shows a state after the tubes 4A and 4B with spiral waves are connected. First, tightening rings 3A, 3A are attached to the ends of the spiral-wave tubes 4A, 4B to be connected, respectively.
B is screw-fitted.

Next, as shown in FIG. 1, the connection sleeve 1 covered with the rubber tube-shaped packing 2 is screw-fitted to the end of one of the spiral wave tubes 4A so that the total length of the connection sleeve 1 is one. So as to cover the outer circumference of the spiral wave tube 4A. Next, after the open end of one spiral wave tube 4A and the open end of the other spiral wave tube 4B abut against each other, the connection sleeve 1 is rotated in the opposite direction to the previous screw fitting, and the screw is screwed. Return so that the connection sleeve 1 covers half of the ends of both the helical tubes 4A, 4B. As a result, both spiral wave tubes 4A and 4B are mechanically connected by the connection sleeve 1.

Next, both ends of the rubber tube-shaped packing 2 are put on the spiral wave tubes 4A and 4B at both ends of the connection sleeve 1 so as to be turned back. As a result, both ends of the rubber tube-shaped packing 2 are formed into tubes 4 with spiral waves.
A and 4B are tightened. Thereafter, the tightening rings 3A, 3B, which have been screw-fitted to the spiral-wave tubes 4A, 4B in advance, are unscrewed and screwed onto both ends of the rubber tubular packing 2. Then, both ends of the rubber tube-shaped packing 2 are tightened with the tightening rings 3A, 3B.
As a result, it can be pressed against the outer peripheral surfaces of the spiral wave tubes 4A and 4B, so that waterproofness can be ensured.

Embodiment 2 FIG. 3 shows another embodiment of the connecting member according to the present invention. This connecting member differs from the connecting member of FIG. 1 in that both ends of the rubber tubular packing 2 are wrapped around the connecting sleeve 1. The other parts are the same as those of the connecting member of FIG. 1, and thus the same parts are denoted by the same reference numerals and description thereof will be omitted. Even in such a configuration, the connection of the tube with a spiral wave can be performed in the same manner as in the first embodiment.

[Other Embodiments] FIG. 4 shows another embodiment of the present invention. This connection member is composed of a connection sleeve 1 and a rubber tube-shaped packing 2. The connection method is as follows. First, after the connection sleeve 1 and the rubber tube-shaped packing 2 are put on one of the spiral wave tubes 4A, the ends of both spiral wave tubes 4A and 4B are butted. Thereafter, the rubber tube-shaped packing 2 is pulled back and covered so as to straddle both ends of the tubes with spiral waves 4A and 4B. After that, the connection sleeve 1 is unscrewed and screw-fitted so as to straddle both the helical tubes 4A and 4B from above the rubber tubular packing 2. Thus, the spiral-wave tubes 4A and 4B are mechanically connected, and the rubber tubular packing 2 is connected to the connection sleeve 1
As a result, it is pressed against the outer peripheral surfaces of the spiral wave tubes 4A and 4B, so that waterproofness is maintained.

[0017]

As described above, according to the present invention, both ends of the rubber tube-like packing folded or wound on the connection sleeve are put on the spiral wave tube, and then tightened with the tightening ring. Just by tightening the rubber tube-shaped packing, the waterproofness of the connection part can be ensured. Therefore, tape winding is not required, and connection work can be performed easily and in a short time even in a narrow space.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a tube connection member with a spiral wave according to the present invention.

FIG. 2 is a sectional view showing a state in which a tube with a spiral wave is connected using the connecting member of FIG. 1;

FIG. 3 is a cross-sectional view showing another embodiment of the tube connection member with spiral wave according to the present invention.

FIG. 4 is a sectional view showing still another embodiment of the present invention.

[Explanation of symbols]

 1: Connection sleeve 2: Rubber tube packing 3A, 3B: Fastening ring 4A, 4B: Spiral tube

Claims (2)

[Claims] 1. A connection sleeve (1) having a spiral waveform that is screw-fitted to the outer peripheral surface of a tube with a spiral wave to be connected, a length longer than the connection sleeve (1), and a circumferential length with the spiral wave. An intermediate portion in the length direction, which is shorter than the outer peripheral length of the pipe, is covered on the outer periphery of the connection sleeve (1) and is fixed to the connection sleeve (1) by its own elastic contraction force, and both ends are outside the intermediate portion. A rubber tube-shaped packing (2) that is folded or wrapped, and a spiral waveform that presses both ends of the rubber tube-shaped packing (2) that is put on the spiral-wound tube against the outer peripheral surface of the spiral-wound tube. A connection member for a tube with a spiral wave, comprising a pair of fastening rings (3A, 3B) having the following. 2. A method for connecting a spiral wave tube using the connecting member according to claim 1, wherein a screw ring (3A, 4A, 4B) is connected to an end of the spiral wave tube (4A, 4B) to be connected. 3B) screwing in advance, with a spiral wave to connect the connection sleeve (1) with the rubber tube-like packing (2) covered with its ends folded or unwound. Tube (4A, 4B)
Screw-fitting so as to straddle the ends of the rubber tube-shaped packing (2). Spiral corrugated tubes (4A, 4B) at both ends of the connection sleeve (1).
Screwing the tightening rings (3A, 3B) back onto both ends of the rubber tube-shaped packing (2) so that both ends of the rubber tube-shaped packing (2) are spirally corrugated (4);
A, 4B) A method of connecting a tube with a spiral wave, comprising: pressing on a spiral wave tube.