JPH0332629Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a propulsion collar for a hume tube, and particularly to an edge structure at the tip of the collar in the propulsion direction, which is made of synthetic resin.

(Prior art) In general, in centrifugal force reinforced concrete pipes, so-called hume pipes, various joints are used at the joint ends of the fume pipes, and among these, the main types are collar joints, socket joints, and ink joints. There are solder joints, etc.

The above-mentioned collar joint is made by fixing a ring-cut tube with an inner diameter slightly larger than the outer diameter of the hume tube to the end of the hume tube with mortar, and then joining this hume tube to the end of another hume tube to connect the hume tubes together. Connected and piped.

By the way, Huyum tubes are made by excavating the ground one by one.
However, during this connection work, it is necessary to propel the joint to the end of the installed fume pipe while removing surrounding earth, sand, rocks, etc., so the collar is required to be strong. Therefore, steel collars are widely used as propulsion collars.

However, as mentioned above, if a steel collar is used to improve the ability to remove obstacles such as sand and gravel during propulsion, the collar deteriorates due to rust, corrosion, perforation, etc., and water leaks occur many years after piping. There was a problem that the sealing performance was impaired.

Conventionally, in order to prevent water leakage caused by the deterioration of the steel collar mentioned above, the collar is made of hard synthetic resin or fiber-reinforced synthetic resin (hereinafter referred to as FRP). Various attempts to prevent deterioration have been proposed.

(Problem that the invention attempts to solve) However, the above-mentioned conventional hard synthetic resin
According to the propulsion collar made of FRP etc.
It had the following problems.

First, in order to connect the propulsion collars one after another into the ground, the Huyum tubes are lowered into a groove that has been excavated in the ground in advance, and then the propulsion collars are placed on the Huyum tubes that have been installed. When the pipe is propelled, the edge of the propelling collar comes into contact with or rubs against the surrounding earth, sand, and rocks, causing deformation or damage to the collar, which may result in poor connection to the existing hume pipe. The problem was that there was no

Furthermore, there was a problem in that the above-mentioned deformation of the edge portion causes gravel to become easily caught in the inner circumferential side of the propulsion collar due to the fact that the hump tube is curled outward.

The purpose of this invention is to provide a metal protective member on the tip edge of a hard synthetic resin propulsion collar to prevent deformation and damage to the edge due to contact and friction between the collar and gravel. The objective is to prevent gravel from getting caught in the inner circumferential side of the collar.

(Means for Solving the Problems) In order to achieve the above object, the feature of the edge structure of the collar for propulsion of a hume tube according to the present invention is that it is formed of hard synthetic resin, serves as a gravel removal part during propulsion, and when joined In the propulsion collar that serves as a joint, the edge portion of the collar is covered with a metal protective member.

(Function) With the structure as described above, the hume tube with the propulsion collar according to the present invention attached is lowered into the groove cut in the ground and placed on the bottom of the groove, and the hume tube is placed in the groove where the propulsion collar according to the present invention is installed. A metal protection member is provided at the edge of the propulsion collar when moving in the direction of the pipe, so even if gravel near the bottom of the groove collides with or rubs against the propulsion collar, the edge will be protected. will not be deformed or damaged, and the edges will not warp in the direction of the outer periphery and get caught in gravel. Therefore, the joints between the hume canals can also be satisfactorily achieved.

(Example) Hereinafter, an example of the edge structure of the hume tube propulsion collar according to the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 are a perspective view and an exploded sectional view showing an embodiment of the present invention. In each figure, a notch 2 having a small diameter is formed at the outer periphery of the end 1a of the hume tube 1 via a stepped portion, and a propulsion collar 3 is attached to this notch 2. The color 3 is
The main body 3a is formed by molding a hard synthetic resin using a mold, or by winding up continuous fibers impregnated with a synthetic resin using a winding mold, forming layers, and then curing the resin. The thickness of the notch 2 is approximately the same as the depth of the notch 2. A flange portion 3b is formed to protrude from the center of the inner peripheral surface of the main body 3a, and the protrusion length of this flange portion 3b is as follows:
The length is approximately the same as the wall thickness of the end portion 1a of the hume tube 1. An edge portion 3c is formed at the opposite end of the collar 3 from the hume tube 1 side, by circumferentially notching the inner and outer circumferential surfaces and tapering the end surface toward the outer circumferential side.

The edge portion 3c fits into a circumferential groove 4a of a metal protection member 4 having a shape corresponding to the notch, and the tip of the protection member 4 forms a tapered surface 4b.
It has an acute angle shape.

In the above structure, the fume tube 1, the propulsion collar 3, and the protection member 4 are each capped as shown by the arrows in FIG. Then, the inner and outer circumferential surfaces of the whole are propelled in a substantially concentric direction in the direction of arrow A and joined to the ends of separate humid pipes installed underground. At this time, the collar 3 and the protection member 4 are integrated to form a gravel removal section, and the end of the installation side humid pipe is provided with a notch that is the same as the notch 2. When the end portion is fitted into the propulsion collar, the end surface abuts the flange portion 3b and the joining is completed. Even if the metal protection member 4 deteriorates after the connection of the humid pipes is completed and the trench is filled with earth and sand, the collar 3 serving as the joint does not deteriorate.

As an effect specific to the above embodiment, the protection member 4
The distal end surface is made into a tapered surface 4b so that the distal end in the direction of propulsion of the hume pipe is sharp, so that sand and gravel at the bottom of the excavated groove can be deflected to the outside of the hume pipe, and the function as a sand and gravel removal section is improved. You can improve even more.

It should be noted that what has been described above merely shows one embodiment of the present invention, and any modifications and changes may be made without departing from the purpose, structure, and effects of the present invention.

For example, as in other embodiments shown in FIG. 3 and FIG.
A ring portion 14c is formed on the outer circumferential side of the protection member 14 to correspond to the notch portion 13d and protrudes from the tapered surface 14b.
c may cover approximately half of the outer circumferential side of the propulsion collar 13. With this configuration, it is possible to prevent the outer peripheral side of the propulsion collar 13 from being damaged by debris or the like.

Note that in this case, the hume tube 11 has an end portion 11
Without providing a circumferential notch on the outer periphery of the a side, the end 11a is fitted into the inner periphery of the collar 13, and the flange 13b prevents penetration.

(Effects of the Invention) As described above in detail, the edge structure of the hume tube propulsion collar according to the present invention provides the following effects.

First, a metal protective member is provided at the edge of the propulsion collar, so when the hume tube is propelled, the protective member protects the tip of the collar, and the surrounding gravel prevents the propulsion side of the collar from being damaged. This can prevent the tip from being damaged or deformed.

Further, since the propulsion collar does not bend back so as to roll outward of the hump tube, it is also possible to prevent gravel and the like from getting caught inside the propulsion collar. Therefore, it is possible to improve the workability of the work of sequentially advancing and joining the hume tubes.

[Brief explanation of the drawing]

FIGS. 1 and 2 are perspective views showing an embodiment of the edge structure of the hume tube propulsion collar according to the present invention,
3 and 4 are perspective views and exploded sectional views showing other embodiments of the edge structure. 1, 11... Huyum tube, 3, 13... Propulsion collar, 3c, 13c... Edge portion, 4, 14...
...Metal protection member.

Claims (1)

[Claims for Utility Model Registration] It is made of hard synthetic resin and is attached to the end of the hume pipe, and when the hume pipe is propelled through a trench formed in the ground, it becomes a gravel removal part, and the end of the hume pipe is In a propulsion collar that becomes a joint when the part is joined to the end of a hume pipe disposed in a groove, the edge part of the tip of the propulsion collar in the propulsion direction is covered with a metal protective member. Features an edge structure of the collar for propulsion of the Huium tube.