JPS5949165B2 - Manufacturing method of hume pipe with joint collar for propulsion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for centrifugally forming a hume pipe with a joint collar for propulsion construction.

For conventionally used hume pipes for propulsion methods, for example, the hume pipe body and the joint collar are prepared separately, and during the embedding work, water is stopped in an annular groove recessed near the end face of the hume pipe body. A rubber ring is fitted, a joint collar is inserted between the end faces of the two fume pipes to be joined, and then a thrust is applied in the axial direction to connect the previously buried fume pipe to the later installed one. I am trying to have Huyum's canal implanted.

However, while the propulsion method was being implemented, earth and sand entered the gap between the front end of the joint collar and the shoulder of the stepped surface at the rear end of the Huyume pipe body, which was embedded earlier, due to the action of earth pressure. However, as a result, a fluke occurs along the leading edge of the joint collar, reducing the water-stopping effect of the water-stopping rubber ring and increasing the resistance force against the propulsion work, which in extreme cases can damage the joint ring. These have been pointed out as drawbacks associated with conventional hume pipes for propulsion methods.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of conventional hume tubes for propulsion methods and to provide a method for accurately and efficiently manufacturing a new hume tube with a joint collar.

The hume tube with a joint collar obtained by the method of the present invention is as shown in FIG.

It has the following configuration.

In the figure, reference numeral 1 denotes a fume tube body, and a spigot portion A is formed by providing a stepped surface at the front end of the tube body 1 when viewed in the propulsion direction.

On the other hand, a socket portion B is formed at the rear end of the tube body 1 to which a stainless steel joint collar 2 is integrally attached.

The joint collar 2 has a U-shaped folded part 3 at the rear end and a first
a first water stop rubber ring 5 held between the wrinkled groove 4 and the U-shaped folded portion 3 and the first wrinkled groove 40;
, a second wrinkle groove 6 , a second water stop rubber ring 7 , a third wrinkle groove 8 , and a fourth wrinkle groove 9 .

The spigot portion A of the subsequent hume tube is fitted into the socket portion B of the hume tube inserted earlier, and the front end surface of the spigot portion A is in contact with the rear end surface B' of the socket portion B, and the first The water-stop rubber ring 5 deforms and engages with the stepped surface of the spigot portion A to prevent water leakage.

The first squeeze groove 4 serves to hold the first water-stop rubber ring 5 and to increase the rigidity of the joint ring, and the second squeeze groove 6 serves to hold the first water-stop rubber ring 5 and increase the rigidity of the joint ring. The bulge of the molded rubber ring fitted into the molded ring at the end of the tube works together to prevent concrete paste from leaking out and to increase the rigidity of the joint ring.

Furthermore, the third and fourth crimp grooves 8 and 9 prevent the joint collar from coming off from the hume tube body, and increase the rigidity of the joint ring.

As mentioned above, the stainless steel fume pipe with a joint collar does not have a gap at the front end of the joint ring, so there is no risk of the front edge of the joint collar becoming loose as seen in conventional hume pipes.

Since it has excellent durability and can have a large effective pipe cross-sectional area, it is possible to bury the hump pipe in the soil by applying a larger propulsion force than conventional pipes.

The present invention provides a method for centrifugally molding, for example, the above-mentioned hume tube with a joint collar, and this will be explained with reference to FIG. 2.

The forming formwork device used to carry out the method of the present invention includes a formwork body 10 assembled into a cylindrical shape by combining two split formworks, and a formwork body 10 that is fitted onto the spigot side end surface of the formwork body 10. a first tire 11 that is fitted into the mold body 10, a second tire 12 that is fitted onto the socket side end surface of the mold body 10, and a tube end molded that is inserted into the mold inside the second tire 12. It is composed of a ring 13.

A molded rubber ring 14 is fitted into an annular groove provided on the outer periphery of the front end of the cylindrical portion of the tube end molding ring 13 on the formwork insertion side to prevent concrete paste from leaking.

The first and second tires 11 and 12 each have a cylindrical rolling surface 15, which rests on the rollers (not shown) of the drive device.

Due to the rotation of the drive roller, the first and second tires 11 and 1
2 is rotationally driven, thereby rotating the molding form device at high speed.

Reference numeral 16 indicates a rim provided on each of the two-split formwork, and reference numeral 17 indicates a bolt hole provided in the rim.

18 is a slit cut into the rim 16 for the same purpose as the bolt hole 17.

As is clear from the figure, the spigot part A is formed by the first tire 11, and the tube end forming ring 13 and the formed rubber
The socket portion B is formed by the cooperation of the ring 14 and the stainless steel joint collar 2.

The procedure for carrying out the method of the present invention using the molding frame apparatus configured as described above will be described as follows.

First, the two-split formwork is assembled into a cylindrical formwork using bolts (not shown) inserted through bolt holes 17 and slots 18.

Next, the first tire 11 for forming the spigot portion A is fitted into the right end surface of the mold, and the first tire 11 is fixed to the mold using a bracket and bolts (neither of which are shown).

Next, the second tire 12 is fitted onto the left end face of the formwork, and the second casting tire 12 is secured to the formwork in the same manner as the first tire 11.

Next, the joint collar 2 is inserted onto the cylindrical portion of the tube end molding ring 13 on the mold insertion side, and the assembly of the tube end molding ring 13 and the joint collar 2 is inserted into the mold.

The second tire 12 and tube end forming ring 13 are assembled by suitable means (
(not shown).

The molded rubber ring 14 is provided with a bulge 19 along the outer periphery of the innermost end of the tube end molding ring, as shown in the figure, and the bulge 19 fits into the second squeeze groove of the fitting collar 2. The contour of the bulge is designed and its dimensions are determined so that it comes into liquid-tight contact with the inner wall surface of the tube end forming ring 13.
The coupling ring 2 can be held firmly between the shoulder 20 on the insertion side cylindrical surface and the molded rubber ring 14.

The forming formwork assembly assembled as described above is installed on the drive by placing the rolling surfaces 15 of both tires 11 and 12 on a plurality of rollers (not shown) of the drive, and It is rotated by

Concrete/materials are poured while the forming formwork equipment is rotating at high speed.

After the concrete solidifies and reaches the specified green hardness,
The rotation of the drive device is stopped, and the forming frame device is moved from the drive device to a predetermined frame-breaking location.

The first tire 11 is removed in the axial direction, and the tube end forming ring 13 and the second tire 12 are also removed in the axial direction.

Note that since the molded rubber ring 14 is flexible, the tube end molding ring 13 is placed in the formwork while compressing and deforming the bulging portion 19 of the molded rubber ring, leaving the hump tube body 1 with the joint collar. It can be removed from.

When the bolts inserted and tightened into the bolt holes 17 and slots 18 are removed, the formwork is disassembled into two parts, and a freshly formed fume pipe 1 can be obtained.

FIG. 3 is a diagram illustrating that it is also possible to mold a hume pipe of a type in which the joint collar 2 is not attached using the above-described molding frame apparatus.

In this case, a molded rubber ring 14' larger than that shown in FIG. The bulging portion 19' on the outer periphery of the mold 14' is brought into contact with the inner wall of the mold in a liquid-tight manner.

Since the molding process is the same as that shown in FIG. 2, repeated explanation will be omitted.

As described above, according to the method of the present invention, a hume pipe with a joint collar can be formed without leaking concrete paste from the formwork, and the joint collar can be mounted exactly concentrically with the body of the hume pipe. be able to.

Furthermore, the method of the present invention can be carried out more easily than conventional molding methods without requiring particularly difficult operations.

[Brief explanation of the drawing]

Fig. 1 is a partial longitudinal cross-sectional view of a hume pipe with a joint collar for propulsion construction to which the method according to the present invention is applied, and Fig. 2 is a longitudinal cross-sectional view of a centrifugal forming formwork apparatus to which the method according to the present invention is applied. Partial view, FIG. 3 is a vertical cross-sectional partial view illustrating a state in which a hume pipe without a joint collar is formed using the forming frame apparatus of FIG. 2. 1.1'... Huyum tube body, 2...
Joint collar, 3...U-shaped folded part, 4...
...First wrinkle groove, 5...First water stop rubber ring, 6...Second wrinkle groove, 7...
...Second water stop rubber ring, 8...Third squeeze groove, 9...Fourth squeeze groove, 10...
...Form body, 11...First tire, 12
...Second tire, 13...Tube end molded ring, 14.14'...Molded rubber ring,
15...Rolling surface, 16...Rim, 17
...Hook hole, 18...Bolt tightening groove, 19, 19'...Bulge, 20...
Shoulder of the cylindrical part on the side where the formwork is inserted.

Claims (1)

[Claims] 1 Combine the two-split formwork, fix the first tire for forming the spigot part of the humid tube to one end face of the cylindrical formwork, and fix the second tire to the opposite end face. A molded rubber ring is fitted into the annular groove recessed at the tip of the cylindrical part on the formwork insertion side of the tube end molding ring, and a metal ring is fitted between the ring and the shoulder of the cylindrical part. With the fitting collar inserted and fixed, the pipe end forming ring is inserted into the formwork and fixed to form a forming formwork device, which is rotated at high speed, concrete and materials are poured into the socket of the hump pipe. A method for manufacturing a hume pipe with a joint collar for use in propulsion construction, characterized by molding a hume pipe to which a joint collar is integrally attached.