JPS5811985Y2 - Concrete pipe joints made by centrifugal force forming - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joint for concrete pipes formed by centrifugal force forming, which can maintain perfect water-resistance and can be connected safely.

In conventional concrete pipe joints, socket joints or stamped-row joints are generally used, and a rubber gasket or ring is placed in the gap between the spigot and the socket of these joints to prevent water leakage. is held.

However, these supports are formed on the inner surface of the mouth, especially in the case of Hume's canal, by putting cement, aggregate, etc. into a mold that rotates at high speed and using centrifugal force, so particles can become dense on the outer peripheral surface. On the other hand, centrifugal force causes material separation on the inner peripheral surface side, resulting in a rough inner surface after molding.

Therefore, even if a gasket is provided, complete watertightness cannot be maintained, and water leakage or water intrusion accidents often occur.

Therefore, if gaskets are installed on both the opening and the spigot of the receiver (Japanese Utility Model Publication No. 45-12688), the water resistance can be improved, but since the soft materials come into contact with each other, there is a risk that the joint may loosen. In addition, there is a risk that the gasket will come into contact with the circumferential surface of the concrete pipe and be worn out during insertion.

In addition, when the receiver is provided with a hard plate on either the mouth or the spigot (Utility Model Publication No. 41-23010) (Utility Model Publication No. 41-23010).
48948), since the plate surface is smooth, the connection between the spigot and the socket is loose, and there is a risk of it coming off easily. There is a problem that the uke collides with the opposite surface of the mouth.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, and to provide a joint for conchnaut pipes formed by centrifugal force forming, which can maintain perfect water-tightness and allow safe connection work. .

Hereinafter, the present invention will be described in detail with reference to illustrated embodiments.

In Figure 1, reference numerals 1 and 1 are concrete pipes formed by centrifugal force forming that are joined by a socket joint, and the receiver of these concrete pipes 1 and 1 is formed with a thin hard plate made of metal or plastic on the inner surface of the mouth 2. Thickness 0.3~2. A short tube 3 of □mm is installed.

As shown in FIG. 2, this short tube 3 has a plurality of convex stripes 4 formed along the axial direction on its inner circumferential surface and protrudes along the circumferential direction, and the receiver is located at the opening 2. Required diameter 9 depending on shape
It has width, thickness, and taper.

To attach the short pipe 3 to the concrete pipe 1, a plurality of anchor pieces 5 are provided on the outer surface of the concrete pipe 1 as shown in the figure, and the short pipe 3 is removably attached to the formwork and centrifugally formed. Deploy using.

On the other hand, in the receiver, a small diameter part 6a is formed at the tip of the insertion hole 6 relative to the opening 2, and a ring-shaped gasket 7 is arranged in this small diameter part 6a.

A plurality of protrusions 7a protruding along the circumferential direction are provided on the outer peripheral surface of the gasket 7 along the axial direction.

Similarly, FIG. 3 is a cross-sectional view of the case where the short pipe 3 is installed on the inner surface of the opening 2 of the concrete fitting 1, 1 using an in-and-out joint. Mouth 2
A short pipe 3 is arranged on the inner surface of the pipe, and a ring-shaped gasket 7 is arranged in the gap between the short pipe 3 and the spigot 6.

According to the joint of the present invention, the socket 6 is connected to the socket 2.
When inserted into the socket, the gasket 7 provided on the socket 6 is inserted while contacting the short pipe 3 of the socket 2,
It comes into contact with the protruding portion 4 of the short pipe 3.

When the spigot 6 is further pushed in, the protrusion 7a of the gasket 7 comes into pressure contact with and engages with the protrusion 4 of the short tube 3, and is positioned at a predetermined position.

As described above, according to the joint for concrete pipes formed by centrifugal force forming of the present invention, the receiver of the concrete pipe is placed on the inner surface of the mouth.
Equipped with short hard pipes made of metal or plastic,
In addition, a soft gasket is installed on the outer surface of the spigot, so
This prevents the gasket from being worn out when inserting the spigot, making the insertion work easier.

In addition, since the short tube is made of a thin hard plate, the multiple protruding stripes provided on the short tube elastically press against the protrusion of the gasket at the joint, so that the The contact pressure is large and a reliable water-stopping effect can be obtained.

Furthermore, the short tube utilizes centrifugal force forming to embed the anchor piece so that the receiver is fixed to the inner surface of the mouth, resulting in extremely good workability and secure fixation.

Furthermore, when the spigot is inserted into the socket, the protrusion of the gasket engages with the protrusion of the short tube to determine its position, so if the spigot is inserted further than necessary, the tip The catch can prevent problems such as colliding with the opposite surface of the mouth.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of a concrete pipe joint made by centrifugal force forming according to the present invention, Fig. 2 is a partial sectional view showing a short pipe in Fig. It is a sectional view applied to a joint. 1... Concrete pipe, 2... Socket opening, 3... Short pipe, 4... Protruding section, 5...
...Anchor piece, 6... Socket, 7...
...Gasket, 7a...Protrusion.

Claims (1)

[Scope of utility model registration request] The supports for the concrete pipes 1 and 1 formed by centrifugal force forming include a short pipe 3 formed of a thin hard plate made of metal or plastic arranged on the inner surface of the mouth 2 via an anchor piece 5;
A small diameter portion 6a formed on the outer peripheral surface of the tip of the insertion hole 6
A ring-shaped gasket 7 fitted into the short pipe 3 is provided with a plurality of convex strips 4 extending along the circumferential direction on the inner circumferential surface of the short tube 3 and extending along the axial direction. A plurality of protrusions 7a protruding along the circumferential direction are provided along the axial direction on the outer circumferential surface of the gasket 7, and the spigot 6 is fitted into the opening 2 of the receiver, and the convex strip 4 of the short pipe 3 A joint for concrete pipes formed by centrifugal force forming, characterized in that the projections 7a of the gasket 7 are brought into pressure contact with each other to connect the concrete pipes 1, 1 to each other.