JPS6011196Y2 - Propulsion tube external protection equipment - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an outer surface protector for a propulsion tube.

In order to bury pipes such as gas pipes and water pipes underground,
Pits are excavated at required intervals, and the work of joining and propelling a single pipe in one of the pits is repeated until it reaches the pit at the other end.

FIG. 1 shows an example of this, in which the propulsion pipe 3 is pressed by the jack 6, but depending on the construction method, it may be towed from the other side of the pit.

In either case, there is no difference in sequentially joining the single pipes in one of the pits and sending them underground, and the present invention is applicable to either case.

To outline the pipe delivery method as shown in FIG.
, the propulsion tube 3 is pressed by a jack 6 via a spacer 5, and in this case, the propulsion platform 2 is formed of a plurality of H of a required length L, which are arranged parallel to each other along the propulsion direction at a required interval W.
It is a shaped steel whose upper inner flange tip comes into contact with the outer surface of the propulsion tube 3, and when the propulsion tube 3 is pressed, it slides and moves forward.

Generally, the propulsion tube 3 is provided with anti-corrosion means on its outer surface using synthetic resin or bituminous coating material, but in the propulsion method described above, H
The disadvantage is that the flange of the shaped steel is damaged and the anti-corrosion effect is diminished.

This invention was devised in view of the drawbacks of the prior art, and its purpose is to prevent the outer surface of the propulsion tube from being damaged by the propulsion platform when the tube is propelled in the pit. The object of the present invention is to provide an outer protection device for a propulsion tube.

The details of the present invention will be explained below with reference to an embodiment illustrated in FIG.

In this figure, the same reference numerals as in FIG.

In FIG. 2, 70 is a protective device according to the present invention, which is a wrapping ring 71. It is composed of a buffer band 72, a tightening cable 73, and a tightening fitting 74.

The winding ring 71 is a semi-circular steel half-band ring 71 having a width W and having a curved surface that comes into close contact with the outer surface of the propulsion tube 3 via a buffer band 72.
At both ends thereof, locking metal fittings 71b each having a circular hole 71b' are fixed.

The buffer band 72 is a pair of band plates made of an elastic member such as base rubber and has a shape that approximately fits the inner surface of the half-band ring 71a, and the lower buffer band 72a is formed between the outer surface of the propulsion tube 3 and the half-band ring. 71
The upper buffer band 72b is placed on the upper half of the propulsion tube 3 corresponding to the lower buffer band 72a.

One end of the tightening band 73 is connected to the circular hole 71 of the locking fitting 71b.
A steel cable 73' of a predetermined length is secured to b'.

73'', the other end of each steel cable is removably connected to a tightening fitting 74, and the operating rod 74' of the tightening fitting 74
By pushing and tightening the steel cable 73', the upper and lower buffer bands are created. '2at72b allows the protective device 70 to be wrapped around and fixed to the external surface of the propulsion tube 3 without damaging the external surface of the propulsion tube 3, and the protective device 70 can be secured by disengaging the tightening fitting 74 and the steel cable 73'. It can be easily removed from the propulsion tube 3.

This embodiment of such a structure is used in the following manner.

Before the propulsion tube 3 is placed on the propulsion stand 2 in the pit 1, a plurality of protection jigs 70 are wrapped around the propulsion tube 3.

After that, when the propulsion tube 3 is placed on the propulsion stand 2, the single band ring 71
Since point a comes into contact with the edge of the propulsion platform 2, it can be propelled using the same method as in the prior art.

The protective gear 70 that has passed through the propulsion platform 2 is separated from the propulsion tube within the pit.

As described above, in the present invention, the winding ring is detachably attached to the outer surface of the propulsion tube via the buffer band, so there is no possibility that the outer surface of the tube is damaged by the propulsion platform 2 as in the prior art. Furthermore, by applying a lubricant such as grease to the outer surface of the single band ring 71a, propulsion can be carried out without difficulty, making it a truly excellent outer surface protector for the propulsion tube in practical terms.

[Brief explanation of drawings]

Fig. 1a is a conceptual diagram showing a conventional propulsion method, the same figure is a view taken along the line A-A in Fig. a, and Fig. 2 shows an embodiment of the present invention. A conceptual diagram showing a state in which the protective gear is wrapped and the vehicle is being propelled, and b is a view taken along the line B-B in diagram a. 1: Pit, 2: Propulsion platform, 3: Propulsion pipe, 4: Push ring, 5 Ni spacer - 16: Jacket, 70: Protective equipment, 71: Winding ring, 71: Single band ring, 71b: Buffer band, 71b': Circular hole, 72: Buffer band, 72a: Lower buffer band, 72b: Upper buffer band, 73 (73', 73''): Tightening rope, 74: Tightening fitting.

Claims (1)

[Scope of utility model registration request] A set of buffer bands that come into contact with the outer half of the propulsion tube, and a tension cable that is arranged so as to be able to come into contact with the outer half of the propulsion tube through one of the buffer bands, and has a tightening cable at both ends. An outer surface protector for a propulsion tube, comprising a winding ring, and a tightening fitting that detachably and tightenably connects the tightening rope.