JPH0220306Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a spacing adjustment device for curve propulsion construction method.

The propulsion method is often used in places where it is not possible to excavate and lay pipes, such as across tracks, rivers, roads, or in urban areas with heavy traffic. The pipe joints used for this propulsion method are those that can transmit propulsion force between the socket and the socket, such as those that push the end face of the socket using a flange set up on the outer periphery of the socket. . By the way, in such a pipe joint, if the pipe is to be moved straight, it is sufficient to move the pipe by bringing the flange and the end face of the socket into contact with each other as described above.
When the tube is propelled through a curve, there is a problem in that the socket and the socket must be bent relative to each other. That is, there is a problem in that on the outside of the curve, the distance between the tip of the socket and the back end of the socket must be larger than that on the inside of the curve.

Therefore, the purpose of this invention is to make it possible to appropriately adjust the distance between the tip of the socket and the back end of the back opening so that the socket and the socket can be bent according to the curve when propelling the curve. It is something to do.

In order to achieve this objective, the present invention has developed a pipe joint for propulsion construction that can transmit propulsion force between the socket and the socket, with a gap between the front end surface of the socket and the step surface at the back end of the socket. In addition, an annular distance piece is provided which is divided into a plurality of parts in the circumferential direction, and the entire annular distance piece has the thickest part in the axial direction at one location in the circumferential direction. The thinnest part is located at another position half a circumference away from this thickest part, and the thickness is formed so that it gradually changes between the thickest part and the thinnest part. be.

Therefore, although the configuration is simple, the gap between the tip surface of the socket and the step surface at the back end of the socket can be made wide on the outside of the curve and narrow on the inside of the curve.
During curve propulsion, the socket and insertion port can be easily and appropriately bent in accordance with this curve.

An embodiment of the present invention will be described below based on the drawings. In Fig. 1, 1 is a socket, 2 is an inlet, and a cement mortar lining 3 is applied to the inner surface of the pipe, and a reinforced concrete layer 4 matching the outer diameter of the socket 1 is formed on the outer surface of the pipe. There is. Socket 2
A flange 6 that can come into contact with the end surface 5 of the socket 1 is erected on the outer periphery of the socket 1 and fixed by welding or the like.
A bolt 7 is inserted into the end face 5 of the socket 1 and passes through the flange 6 in the tube axis direction.
A nut 9 is screwed onto the tip of the flange 6 at a distance 8 from the flange 6. Reference numeral 10 denotes an annular earth and sand inflow prevention plate made of rubber, metal, etc. that is externally fitted and fixed near the opening end of the socket 1, and comes into contact with the outer periphery of the flange 6 to seal this part.

On the inner surface of the socket 1, there is an inner flange 1 that continues to the end surface 5.
1, a tapered sealing material pressure contact surface 12 whose diameter increases toward the back side of the socket, a circumferential bottom surface 13, and a radial inner step surface 14 are formed in this order. Reference numeral 15 denotes an annular sealing material, which is interposed between the outer surface of the insertion port 2 and the sealing material pressure contact surface 12. 16 is a pressing device that presses the sealing material 15 through the split ring 17;
It is composed of a plurality of bolts 19 in the circumferential direction that can be screwed out from the bolts 19 and a spacer 20 interposed between the head of the bolt 19 and the step surface 14 at the rear end.

Reference numeral 21 denotes a socket fitting that can be locked to the socket tip surface 22, and 23 is a socket fitting that can be locked to the back end stepped surface 14. A possible hydraulic jack 24 is provided.
25 is a jack holder. As shown in FIG. 2, the socket fitting 23 is configured so that it can be divided into a plurality of parts in the circumferential direction by an assembly-type dividing part 26, and a pressing device 16 is provided at the contact part 27 with the inner step surface 14. Notch 2 for escaping the bolt 19 and spacer 20
8 is formed. Further, the contact portion 27 is capable of contacting the press ring 18 with a surface opposite to the rear end stepped surface 14 .

Although not shown in the drawings, the socket abutment fitting 21 can also be divided into a plurality of parts in the circumferential direction like the socket abutment fitting 23, and a knock pin 30 in the tube axis direction is provided at the abutting portion 29 with the socket end face 22. is typed in. Reference numeral 31 denotes a distance piece whose one end surface abuts the contact portion 29 and the other end surface abuts the insertion end surface of the press ring 18, and is divided into a plurality of pieces in the circumferential direction (in this example, six pieces) as shown in FIG. ), each divided piece 32
is a pair of pin holes 33 that can be fitted with a dowel pin 30.
a and 33b, respectively. This distance piece 31 is located at a position 34 as shown in FIG.
The thickest part 35 in the axial direction is formed at the position 34, and the thinnest part 3 is formed at a position 36 separated by half a circumference from the position 34.
7 is formed. Moreover, the thickness is formed so as to gradually change between the thickest part 35 and the thinnest part 37. That is, FIG. 1 shows a sectional view at the thickest part 35, and FIG. 5 shows a sectional view at the thinnest part 37.

In such a configuration, when moving the tube, first insert the insertion port 2 into the socket 1, press the sealing material 15 with the pressing device 16,
Screw the nut 9 onto the bolt 7. After this, when the pipe is to be moved straight, the flange 6 and the end face 5 are brought into contact with each other, and the propulsive force is transmitted from the insertion port 2 to the socket 1 through this contact portion.

In the case of curve propulsion, the socket abutment fitting 23 and the socket abutment fitting 21 are assembled together with the hydraulic jack 24 between the back end step surface 14 and the socket tip end surface 22. At this time, the distance piece 31 is attached to the knock pin 30 such that the thinnest part 37 is located on the inside of the curve, and the thickest part 35 is located on the outside of the curve.
mated with. After that, when the socket 2 is pushed in so that there is no gap between the socket tip surface 22 and the back end step surface 14, the change in the thickness of the distance piece 31 in the circumferential direction causes the outside of the curve to be wider than the inside of the curve. The distance between the tip end surface 22 of the socket and the step surface 14 at the far end is widened, and thereby the socket 1 and the socket 2 are appropriately bent in accordance with the curve.

Now, extend the jack 24 and move the socket 1 to the socket 2 within the distance 8 between the nut 9 and the flange 6.
Propel it forward against the enemy. After that, operate the rear jack (not shown) to shorten the jack 24 and draw the socket 2 toward the socket 1. Then, the gap between the tip end surface 22 of the insertion port and the step surface 14 at the rear end disappears again, and the same state as described above is achieved. Therefore, by repeating these operations, curve propulsion is gradually performed.

As described above, according to the present invention, although the configuration is simple, the distance between the tip surface of the socket and the step surface at the back end of the socket can be
Since it can be made wider on the outside of the curve and narrower on the inside of the curve, the socket and the socket can be easily and appropriately bent in accordance with the curve during curve propulsion.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a sectional view of the distance piece at its thickest point, Fig. 2 is a view showing the socket fitting, Fig. 3 is a plan view of the distance piece, and Fig. 3 is a plan view of the distance piece. FIG. 4 is a front view thereof, and FIG. 5 is a sectional view at the thinnest part of the distance piece. 1...Socket, 2...Socket, 14...Rear edge surface,
16...Press device, 21...Socket fitting, 22...
... Socket end surface, 23 ... Socket stopper, 24 ... Hydraulic jack, 31 ... Distance piece, 3
4, 36...Position, 35...Thickest part, 37...Thinnest part.

Claims (1)

[Scope of utility model registration request] In a pipe joint part for a propulsion method that can transmit propulsion force between a socket and a socket, it can be arranged without a gap between the front end surface of the socket and the step surface at the back end of the socket, and
An annular distance piece divided into a plurality of parts in the circumferential direction is provided, and the entire annular distance piece has a thickest part in the axial direction at one place in the circumferential direction, and is spaced half a circumference from this thickest part. A spacing adjustment device for a curve propulsion method, characterized in that it has a thinnest part at one position, and is formed so that the thickness gradually changes between the thickest part and the thinnest part. .