JPS60538Y2 - Hume pipe for propulsion method - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved Huyum tube used in propulsion construction methods.

The conventionally used hume pipe for propulsion method is the first one.
As shown in the figure, a fume tube body 1 is formed by centrifugal force forming, and annular grooves 2 into which water-stop rubber rings are fitted are recessed near both end faces at appropriate locations on a stepped surface 3. be.

As shown in Fig. 2, this hume pipe is constructed by inserting a waterproof rubber ring 4 into the annular groove 2 of the hume pipe main body 1, which was previously buried using the propulsion method, when connecting the two hume pipes. A water-stop rubber ring 4' is also fitted into the annular groove 2' of the fume pipe body 1' which will be buried later, and a steel plate rubber ring 4' is fitted over both water-stop rubber rings 4 and 4'. Attach the joint collar 5.

The joint collar 5 has the same outer diameter as the outer diameter of the hume tube body 1, is made symmetrically with respect to a central flange 6 projecting radially inward, and is attached to the rear of the hume tube body 1. The flange 6 is sandwiched between the end face and the front end face of the fume tube body 1'.

Arrow 7 indicates the direction in which the hume tubes 1 and 1' are propelled.

In the conventional hume pipe for propulsion construction constructed as described above, as the hume pipe is pushed into the holes that are successively excavated, the shoulder 8 of the step surface 3 is bent due to the action of earth pressure.
There is a risk that earth and sand may enter the gap between the front edge of the joint collar 5 and the front edge of the joint collar 5, causing the front end of the joint collar 5 to curl up.

If such curling occurs, the water-stopping function of the water-stopping rubber ring will be significantly reduced, leading to water leakage, and in extreme cases, cracks may appear in the joint collar 5.

Furthermore, since the joint collar 5 is made of steel, corrosion due to rust occurring underground after installation is a major problem.

Therefore, anti-corrosion coating is applied to the surface of the steel collar 5, but sufficient corrosion protection cannot be expected as it peels off or deteriorates due to collision with gravel in the ground during pipe propulsion. The effect wears off in a short period of time.

In addition, a collar made of corrosion-resistant steel such as stainless steel may be used instead of a steel collar, but in this case as well, there is a drawback that deformation such as curling is likely to occur as described above, and the price is high.

The purpose of the present invention is to solve the problems of conventional hume pipes for propulsion methods, and to provide a hume pipe for propulsion methods that is highly corrosion resistant, highly flexible, lightweight, has excellent strength, and has good workability. The gist of this is that a step is provided at one end of the tube to form a spigot section, and a fitting collar made of glass fiber reinforced plastic is installed at the other end with a portion protruding from the end surface. It is integrally fitted to the outer periphery of the main body to form a socket part, and among the plurality of protrusions formed on the inner surface of the joint collar, the first protrusion formed at the rear protruding end and the first protrusion in front thereof. A water-stop sealing material is fitted into the groove between the second protrusions formed, and the second protrusion has a protruding dimension so as to come into contact with the outer periphery of the spigot of the rear propulsion fume pipe to be connected. The third protrusion formed in front of the second protrusion is embedded in the hume tube main body for fixing purposes.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Note that the same elements as those in the above conventional example are indicated by the same reference numerals.

FIGS. 3 and 4 show an embodiment of the present invention, and numeral 1 in the figures indicates a hume pipe for the propulsion method.

A spigot portion A having a stepped surface 3 on the outer periphery is formed at the front end of the fume tube 1 in the propulsion direction (right side in FIG. 3), and a joint collar is provided at the rear tube end in the propulsion direction. 1
0 is integrally attached with a portion thereof protruding from the end face, thereby forming a socket portion B.

As shown in FIG. 4, the front end surface of the spigot portion A comes into direct contact with the rear end portion of the other hume tube body, that is, the rear end surface of the socket portion B.

The above joint collar 10 is made of glass fiber reinforced plastic (
As shown in FIG. 4, a first protrusion 11, a second protrusion 12, and a pair of third protrusions 13, 13 are formed on the annular inner surface. There is.

A groove 14 is provided between the first protrusion 11 formed at the rear tip and the second protrusion 12 formed in front of the first protrusion 11 .
A water stop sealing material 15 is inserted into the groove 14.

The inner diameter of the sealing material 15 is set to be slightly smaller than the outer diameter of the spigot portion A of the fume pipe 1' to be installed later.

The second protrusion 12 is connected to the spigot when the spigot part A of the rear hume tube 1' comes into contact with the socket part B of the front hume tube 1 as shown in FIG. The protruding method is set so that the clearance with part A is almost zero and the spigot part A can be substantially abutted on the outer circumferential surface of the spigot part A.

Further, the second protrusion 12 functions as a positioning means when setting the joint collar 10 in the mold of a centrifugal molding machine, and the inner surface of the second protrusion 12 comes into contact with the corresponding part of the mold. The contact acts to prevent concrete grout from leaking out of the mold.

The pair of third protrusions 13 are for fixing purposes, and are embedded in the hume tube main body as shown in the figure to further strengthen the attachment to the main body.

The above-mentioned fiber-reinforced plastic collar 10 is made by dipping glass fibers in the form of a glass roving into a solution of polyester resin or epoxy resin, wrapping it around a core mold as appropriate, and removing the core mold after curing to form a predetermined shape. Can be bottom shaped.

Further, after the joint collar manufactured in this manner is set in a predetermined formwork, concrete is filled into the formwork and the bottom is shaped by centrifugal force or vibration method to obtain the above-mentioned hume pipe 1 for the propulsion method.

When laying the pipe, the spigot part A of the subsequent hume pipe 1 is inserted into the socket part B of the previously buried hume pipe 1, as shown in FIG.

At this time, the water-stopping sealing material 15 deforms as shown in FIG. 4 to watertightly seal between the joint collar 10 and the outer peripheral surface of the spigot portion A, thereby enhancing the water-stopping effect.

Further, the outer circumferential portion of the tip of the spigot portion A of the rear fume tube 1' is guided by the second protrusion 12 of the collar 10 as described above, and the spigot portion A and the second protrusion 12 are in substantially contact with each other. , the hume tubes 1 and 1' are end-connected.

If there is no second protrusion 12, the subsequent hume pipe 1'
There is a great possibility that the axes of the front and rear fume pipes 1, 1' may be misaligned during the propulsion process and after the installation. Since it is made small, the axes of the joining pipes can be accurately matched, and the accuracy of the pipe line can be improved.

In addition, since the third protrusion 13 of the tip 10a of the joint collar 10 is firmly embedded and fixed in the main body of the tube, problems such as curling of the tip 10a during propulsion, as in the conventional example, can occur. There is no risk of this occurring.

Further, since the joint collar 10 is made of glass fiber reinforced plastic, it has strength equal to or greater than that of a steel collar, has excellent corrosion resistance and flexibility, and is lightweight and easy to handle.

In particular, when a plurality of protrusions are formed as in this embodiment, each protrusion can also function as a reinforcing rib, which increases the bending strength and prevents the joint collar 10 from coming off. do not have.

It goes without saying that the number of the third protrusions 13 to be formed is arbitrary, and the thickness, outer diameter, length, etc. of the collar 10 can also be arbitrarily set according to design conditions.

Next, an example of strength test of FRE color will be shown.

The present invention is constructed as described above, and in particular, by making the joint collar made of glass fiber reinforced plastic, there is no fear of corrosion of a part of the collar, which was a problem in the past, and the bottom shape can be formed at a relatively low cost, and the strength is improved. It has excellent flexibility, is lightweight, and has good workability.

Furthermore, the main body of the hume tube and the joint collar are firmly attached, there is no curling up of the tip, and the tube has excellent water-stopping properties, making it useful for improving the accuracy of conduit formation.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view taken in the axial direction of a conventional hume pipe for propulsion construction, Fig. 2 is an enlarged partial cross-sectional view of the joining part of a conventional hume pipe for propulsion construction, and Fig. 3 is a cross-sectional view of the hume pipe for conventional propulsion construction. 4th cross-sectional view taken in the axial direction of the hume pipe for the propulsion method according to
The figure is an enlarged partial cross-sectional view of the connecting portion of the Hume's canal according to the present invention. 1.1'... Huyum tube body, 3...
Step surface, A... Spigot part, B...
Socket part, 10... Joint collar, 11...
...First protrusion, 12...Second protrusion, 13
...Third protrusion, 14...Groove, 15.
...Water-stop sealing material.

Claims (1)

[Scope of utility model registration request] A step is provided at one end of the tube to form a spigot section, and at the other end, a fitting collar made of glass fiber reinforced plastic is integrally fitted to the outer periphery of the fume tube body with a portion protruding from the end surface. Among the plurality of protrusions formed on the inner surface of the joint collar, the socket part is formed between the first protrusion formed at the rear protruding end and the second protrusion formed in front of the first protrusion. A water-stopping sealing material is fitted into the groove, the protrusion dimension is set so that the second protrusion comes into contact with the outer periphery of the spigot part of the rear propulsion fume pipe to be connected, and the second protrusion A hume pipe for a propulsion method, characterized in that the third protrusion formed at the front is buried in the hume pipe main body for fixing purposes.