JPH0237350Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a joint structure of a propulsion tube without an armor.

The propulsion pipe used in the conventional propulsion method usually has a socket and a socket, and a flange set up on the outer periphery of the socket is connected to the socket using a stud bolt embedded in the end face of the socket. In addition, in order to reduce the resistance during propulsion, an exterior concrete layer is formed on the outer periphery of the pipe except for the socket, and the outer diameter of this concrete layer is made equal to the outer diameter of the socket.

However, such conventional propulsion tubes have a joint that connects a socket and an inlet to each other, and are cast to a fixed length by centrifugal casting, so this cannot be done arbitrarily. If you want to use the length, you have to cut and remove the unnecessary receptacle part, but this removed part cannot be reused and there is a problem that material is wasted.

Therefore, an object of the present invention is to make it possible to effectively utilize the pieces removed by cutting and removing when obtaining a propulsion tube of any length by cutting the tube.

In order to achieve this objective, the present invention fixes a retaining ring to the inner circumferential surface near the end face of a propulsion tube with a uniform outer diameter, and a weld bead for engaging the sealing material on the inner circumferential surface on the back side of the retaining ring. A collar is provided which is fitted into the abutting portion of the pair of propulsion tubes and is capable of compressing an annular sealing material between the outer circumferential surface of the collar and the inner circumferential surface of each propulsion tube, and the outer circumferential surface of the collar is A weld bead for preventing movement of the collar is formed in the abutting portion, which can be fitted into the annular space formed between both retaining rings at the abutting portion.

Therefore, since it does not have a socket or insertion port like conventional ones, the outer diameter is uniform, and the joint part can be created by machining, so it is possible to obtain a pipe of any length by cutting the pipe. Sometimes, the removed portion can also be used by creating a similar joint structure, and it is also possible to manufacture multiple short tubes of the same length from a long tube, so there is no waste of material during manufacturing, and Since the conventional flanges, stud bolts, and exterior concrete layer are not required, it is possible to reduce costs and weight, and since the same Tighton type can be maintained as before, there is no need for joining. There is no need for it.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In the drawing, 1,1 is a propulsion tube,
The tube is formed by centrifugal casting so that the outer diameter is uniform, that is, the outer diameter is constant in the axial direction, and cut to a required length. A machined inner peripheral surface 3 is formed in a certain range from both end surfaces 2, 2 of this propulsion tube 1, and the surface roughness is improved compared to the as-cast state. A cement mortar lining layer 4 is formed on the inner surface of the tube except for the inner peripheral surface 3.

A circumferentially split retaining ring 5 having a rectangular cross section is fixed to a portion of the inner circumferential surface 3 in the vicinity of both end surfaces 2, 2 by welding, respectively. Further, a weld bead 6 for engaging a sealing material is formed in a portion of the inner circumferential surface 3 on the back side at a predetermined distance from the retaining ring 5. This weld bead 6 is built up continuously or in sections in the circumferential direction, and is machined after building up so that the width and height become predetermined values.

The drawing shows a state in which such propulsion tubes 1, 1 are butted against each other. This butt part 7
A collar 8 is fitted in the collar 8 so as to face the inner circumferential surfaces 3, 3, and is engaged with the weld bead 6 between the outer circumferential surface 9 and the inner circumferential surfaces 3, 3 of the collar 8. 5 is compressed. The inner diameter of the collar 8 is set to be slightly larger than the inner diameter of the cement mortar lining layer 4, so that the collar 8 does not adversely affect the flow of fluid within the pipe. Furthermore, tapered surfaces 11 are formed on the outer periphery of both ends of the collar 8 .

At the abutting portion 7, an annular space 12 is formed between the retaining rings 5, 5, and a collar movement prevention member that can be fitted into the annular space 12 is provided on the outer peripheral surface 9 at the center of the collar 8. A weld bead 13 is formed. This weld bead 13 is formed continuously or segmented in the circumferential direction, and is engaged with the retaining rings 5 to prevent movement of the collar 8 in the axial direction. In addition, this lining layer 4 due to contact between the collar 8 and the lining layer 4
damage is also prevented.

The collar 8 is painted after processing the tapered surface 11 and the weld bead 13, and the retaining ring 5 is fixed to the inner circumferential surface 3 in order to secure the required distance between it and the outer circumferential surface 9 of the collar 8. After that, it may be machined if necessary. Further, the propulsion tubes 1, 1 may be long or cut to a required length. For example, a plurality of short tubes of equal length may be cut out from a long tube, such as cutting two or three 3 m tubes from a 6 m tube or a 9 m tube.

[Brief explanation of the drawing]

The drawing is a sectional view of a main part of an embodiment of the present invention. 1... Propulsion tube, 2... End surface, 3... Inner peripheral surface, 5
... Retaining ring, 6 ... Weld bead for engaging sealing material, 7
... Butt portion, 8 ... Collar, 9 ... Outer peripheral surface, 10 ... Sealing material, 12 ... Annular space, 13
...Welding bead to prevent collar movement.

Claims (1)

[Scope of utility model registration request] A retaining ring is fixed to the inner circumferential surface near the end face of the propulsion tubes, which have a uniform outer diameter, and a weld bead for engaging the seal material is formed on the inner circumferential surface on the back side of the retaining ring. A collar is provided which is fitted into the abutting portion and can compress the annular sealing material between the outer circumferential surface of the collar and the inner circumferential surface of each propulsion tube, and both retaining rings are attached to the outer circumferential surface of the collar at the abutting portion. A joint structure for a propulsion tube without an armor, characterized in that a weld bead for preventing collar movement is formed that can be fitted into an annular space formed between the two.