JPH046852Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Use The present invention relates to an in-pipe traction guide that is applied to a traction rope for objects that are towed inside a pipe.

BACKGROUND ART Conventionally, lining, cleaning, or various inspections have already been carried out by passing predetermined jigs into a gas main pipe. It would be extremely convenient if such a construction method could be applied to lining branch pipes branched from a gas main pipe.

Problems that the invention aims to solve However, branch pipes usually have many bends.
(elbows, etc.), so if you try to move the specified jigs inside the pipe by pulling the rope,
It was discovered that the jigs were stuck at the bend, and there was a problem with the jigs passing through the pipe.

The present invention was made with the aim of eliminating these conventional problems.

Means for Solving the Problems In the present invention, a plurality of guide balls are arranged at small intervals in sequence at a position near the jigs of a traction rope for pulling and moving predetermined jigs in the pipe axis direction. The present invention relates to an intraductal traction guide characterized in that the guide balls are provided in series, and at least one of the guide balls is a horizontally elongated ball. In this specification, the term "ellipse" is used in a broad sense including ellipses.

Embodiment An embodiment of the present invention will be described below based on the accompanying drawings.

In the figure, reference numeral 1 denotes a towing rope for towing and moving predetermined jigs b inside a pipe a, and at the end of the rope 1, there are a plurality of jigs and jigs b adjacent to each other. Guide balls 21, 22, . . . are sequentially attached in series with small intervals between them. Even if the number of guide balls installed is too large, it is not expected to improve the guiding effect much, so 2 to 5, especially 3 to 4, is appropriate, and the figure shows a case with 4 guide balls. .

At least one of the guide balls 21, 22... needs to be a horizontally long oblong ball. The figure shows one oval guide ball 22,
Install it second from the starting end, and place it next to the other guide ball 2.
The case where 1, 23 and 24 are constructed from perfect round spheres is shown. The installation position and number of the oblong guide balls 22 are not particularly limited.

There is no particular problem with the diameters of the perfect circular guide balls 21, 23, and 24 as long as they are smaller than the inner diameter D of the tube a, but they are usually around 2/5D to 4/5D in consideration of the passage through the tube and the guiding effect. It is set as appropriate from the range of . As long as the dimensions of the balls are within this range, they do not necessarily all have to be the same, and balls of different dimensions may be used in appropriate combination.

The short diameter L ₁ of the oval guide ball 22 only needs to be large enough to overcome the step c at the bend a ₁ of the pipe a, and is usually within the range of 0.3D≦L ₁ <0.8D. , are appropriately selected in consideration of the balance with the front and rear perfect circular guide balls 21, 23, etc. Also, the major axis
If L ₂ becomes too large, it may cause occlusion in the tube, so it is usually 0.5D≦L ₂ <1.5D.
The selection is determined from the range. Although the ratio of the short axis L ₁ to the long axis L ₂ can be selected from a wide range, a ratio of 1.0<L ₂ /L ₁ ≦ 3.75, particularly 1.2 < L ₂ /L ₁ <1.7 is appropriate.

Starting end guide ball 21 and ending end guide ball 24
It is preferable that the interval is approximately equal to the length l of the central axis of the pipe bending part _a1 , or slightly longer than this, and even if the interval is larger than this, or conversely, it is too small. This is also undesirable because it causes a decrease in the guiding effect.

The mutual spacing between the guide balls 21 to 24 and the spacing between the end guide ball 24 and the jig b are such that the traction rope section 11 between them does not directly touch the pipe wall when passing through the pipe bend part _a1 . It is determined as appropriate based on the relationship between the ball diameter and the radius of curvature of the pipe bending portion _a1 . A large gap where the traction rope section 11 directly touches the pipe wall of the pipe bend section _a1 causes a reduction in the guiding effect.
Undesirable.

In addition, in the figure, a coating device for pipe lining is shown as jig b, but jig b is
Other examples include various inspection devices inside pipes and scrapers for cleaning inside pipes.

FIG. 2 schematically shows the state of the towing guide of the present invention when it passes through the pipe bend _a1 . Tow rope 1
The guide balls 21 to 24 provided in the tube function to bring the position for pulling the jigs B closer to the center axis of the tube in the tube bend _a1 , and thus, when passing through the tube bend _a1 , resistance is reduced.

The present invention provides such guide balls 21 to 24.
It is characterized in that it includes at least one horizontally long oval guide ball 22. When such a horizontally elongated guide ball 22 is provided, the passage through the pipe bending portion _a1 is much improved, compared to, for example, when the entire guide ball is made of a perfect round sphere. This was confirmed for the first time through numerous experiments by the present inventor and others, and the reason for the improved passability is not clear, but in the case of an elliptical sphere, the contact area with the tube wall surface is smaller than in the case of a perfect round sphere. The radius of curvature is large, so the contact angle with the pipe wall is small, and as a result, it is possible to smoothly pass through the step c of the bent part _A1 , which has a subtle effect on the improvement of passage performance. It is estimated.

Effects As described above, the towing guide of the present invention can improve the passage through bent portions of pipes, and is particularly useful for towing inside pipes of piping systems that have many bent portions, such as branch pipes from a gas main pipe.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention;
The figure is a side view schematically showing how the tube passes through the bend. In the figure, 1 is a towing rope, and 21 to 24 are guide balls.

Claims (1)

[Scope of utility model registration request] At a position near the jigs b of the traction rope 1 for towing and moving the predetermined jigs b in the tube axis direction within the pipe a,
A plurality of guide balls 21, 22... are sequentially provided in series with small intervals, and at least one guide ball 22 among these guide balls 21, 22... is a horizontally long oblong ball. Features an in-tube traction guide.