JPS5940631Y2 - pipe fittings - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pipe joint that connects pipe bodies to each other.

In general, in large-diameter water and sewage pipelines that are buried underground, the pipe joint structure that connects the pipe bodies to each other is a dowel joint, a flange joint, etc. It is well known that cast iron pipes are often used, in which the ends of one of the opposing tube bodies are integrally formed with a socket for receiving the end of the other tube body.

The reason why cast iron pipes are often used for water and sewage line pipes is that the structure of the pipe joints that connect the pipe bodies to each other has been technologically established to the point that it can be used in all kinds of situations. These include easy connection work, low cost, and relatively good corrosion resistance.

However, in the case of cast iron pipes, there is a fatal problem: (1) The pipe joint structure is such that when the pipe end of one pipe body is provided with a socket that receives the pipe end of the other pipe body, the pipe diameter is Since it is larger, it is necessary to increase the amount of excavated earth and sand at the connection part, and it is difficult to handle; ■ It is easy to crack due to a single cause due to the casting manufacturing process when subjected to repeated loads; ■ It is brittle. In order to ensure the same strength, the steel pipes need to be thicker than the so-called steel pipes manufactured by the seamless pipe manufacturing method, the spiral pipe manufacturing method, the VOE pipe manufacturing method, etc., and have problems such as being heavy and difficult to handle.

Therefore, in recent years, so-called steel pipes have been increasingly used, which do not have the above-mentioned problems (1) and (3) that cast iron pipes have.

In this case, in manufacturing the steel pipe, a separate process is required to integrally mold the socket part, such as a cast iron pipe, at the end of the pipe.
In order to prevent this disadvantage from being expensive, there is a need for the development of a pipe joint that can connect pipes with the same diameter over their entire length and that is easy to work with. be.

Therefore, in the past, various pipe joints for steel pipes have been proposed, such as in Japanese Utility Model Application Publication No. 54-89523, but pipe joints in this case are intended only to connect steel pipes without compromising airtightness. Because of this purpose, the external protrusion is thick.

For this reason, the present invention is particularly suitable for use as a pipe joint for connecting steel pipes of the same diameter over the entire length, in place of the cast iron pipes used in the formation of underground water and sewage pipelines, such as large-diameter pipes that are specifically targeted by the present invention. However, the above-mentioned drawback (2) of cast iron pipes cannot be overcome and cannot be addressed.

The present invention has been developed in view of the above, and can be used not only as a pipe joint for connecting pipe bodies in the formation of ordinary pipelines, but also particularly for large-diameter pipes, such as cast iron pipes in the formation of water supply and sewage pipelines buried underground. As a pipe fitting for steel pipes that replaces pipe fittings, it does not impair the airtightness that is the main purpose of pipe fittings, eliminates the above-mentioned drawbacks of cast iron pipes, and provides a simple structure that is easy to work with, lightweight, and inexpensive. This is what I am trying to do.

The present invention has an annular locking groove formed on the outer circumferential surface of each tube end of the tube bodies to be joined, and an annular locking groove that is fitted over the tube ends of the joint tube bodies, and is provided on the inner circumferential surface of each of the above-mentioned locking grooves. A joint body is formed into at least two parts and has an engaging protrusion that fits into a locking groove, and a pair of bolts are implanted facing each other in adjacent end surfaces of the joint body, and the bolts are respectively inserted through the joint body. A connecting plate having a long hole formed at an inclined angle to encourage a pulling action on the joint body through the bolt by a pressing force from one direction along the axial direction, and a connecting plate that is screwed to the bolt through the connecting plate. and an elastic packing that is embedded between the edges of the joint pipe body and inserted and supported between the outer peripheral surface of the pipe end and the inner peripheral surface of the joint body. This is a pipe joint characterized by:

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the pipe joint of the present invention will be described in detail below with reference to the accompanying drawings.

Reference numeral 1 denotes a tube body to be joined, and the joint tube body 1.1 has annular locking grooves 2 formed on the outer peripheral surface of its tube end portion 2, respectively.

Reference numeral 4 denotes a joint main body which is divided into at least two parts and whose bottom is shaped so as to be fitted over a predetermined length over the pipe ends 2 of the joint pipe body 1, and the joint main body 4 has the above-mentioned locking grooves 3 near both ends thereof. An engaging protrusion 5 is provided around the inner circumferential surface corresponding to the inner circumferential surface, and an engaging protrusion 5 is provided around the outer circumference of the tube end 2 while being embedded between the edges of the joint tube body 1.1 in the central inner circumferential surface. A groove 7 is formed to insert and support the elastic packing 6 between its surfaces.

It goes without saying that the engaging protrusions 5 may be disposed intermittently around the inner peripheral surface of the joint body 4 instead of being disposed continuously around the inner peripheral surface of the joint body 4.

Reference numeral 8 denotes a tightening member installed between adjacent ends of the joint body 4, and in the illustrated case, the tightening member 8 is a pair of clamping members 2 facing each other at the adjacent ends of the joint body 4. A pair of bolts 9 are planted in parallel, and a push is applied from one direction along the axial direction of arrow A in FIG. An appropriate number of elongated holes 10 are formed with an inclination angle to promote a pulling action on the joint body 1 via the bolt 9 due to pressure.
a connecting plate 11 having a
It consists of a nut 12 that is screwed together via a nut 12.

Although the above-mentioned joint body 4 is divided into two parts in the illustrated example, it is not limited to this, and the joint body 1,
Of course, the optimum number of divisions may be arbitrarily determined depending on the diameter of the pipe 1, and the bolts 8, nuts 12, and elongated holes 10 of the tightening member 8 are also selected in the same manner.

In addition, when the locking groove 3 and the engagement protrusion 5 are in a fitted state, the width of the locking groove 3 is widened, so that the difference is
The allowable range of the amount of expansion/contraction and amount of deflection can be set as 1.

The pipe joint of the present invention is constructed as described above, and the working procedure thereof will be explained next.

First, an elastic packing 6 is provided around the outer circumferential surface of the tube ends 2 of the tube bodies 1, 1 to be joined, while being buried between the edges, and bolts 9 of the tightening member 8 are installed in advance on the adjacent end surfaces. As shown in FIG. 3, the joint body 4 is inserted and supported between the outer peripheral surface of the joint pipe body 1 and the inner peripheral surface of the joint body 4 by fitting the elastic packing 6 into the groove 7 thereof, and The engaging protrusion 5 is fitted into the locking groove 3 so as to engage with it.

Next, in order to cover the connecting plate 11 of the tightening member 8 on the outer circumferential surface of the joint body 4 and the adjacent end surface thereof, each elongated hole 1 is formed.
At the same time as the bolt 9 is inserted into the bolt 9, a nut 12 is screwed onto the bolt 9 via a connecting plate 11 and temporarily tightened.

In this state, by applying a pressing force in one direction along the axial direction to the connecting plate 11 as shown by the arrow A shown in FIG. It is designed to be pulled together by the sliding movement of the bolt 9 under the action of an angle, and at the same time to generate a strong tightening force in the joint body 4.

After that, by fully tightening the nut 12, the joint pipe body 1,
1 connection work can be performed.

In this way, according to the pipe joint of the present invention, by shifting the pressing force in one direction along the axial direction on the connecting plate of the tightening member by 1, the sliding of the bolt caused by the inclination angle of the elongated hole can be achieved. The simple structure of connecting the joint pipe bodies by pulling together the split joint body and simultaneously generating a strong clamping force on the joint body makes it easy to work, but the connection work defeats the main purpose of the pipe joint. Therefore, pipe fittings used especially when forming large-diameter pipes, such as water and sewage pipelines buried underground, are suitable for pipe fittings that protrude outward from the connecting part. Since it is possible to reduce the amount of water, all of the problems of conventional pipe joints for connecting cast iron pipes can be solved, making it the most suitable device that has both great effects and practical benefits.

[Brief explanation of drawings]

The attached drawings show one embodiment of the pipe joint of the present invention.
The figure is a partially cutaway front sectional view showing the connection state, FIG. 2 is a partially cutaway side sectional view, and FIG. 3 is an enlarged sectional view of the main part. 1 is a joining pipe body, 2 is a pipe end, 3 is a locking groove, 4 is a joint body, 5 is an engaging protrusion, 6 is an elastic packing, 8 is a tightening member, 9
is a bolt, 10 is a long hole, 11 is a connecting plate, and 12 is a nut.

Claims (1)

[Scope of utility model registration request] An annular locking groove formed on the outer circumferential surface of each tube end of the tube bodies to be joined, and an annular locking groove that is fitted over the tube ends of the tube bodies to be joined, and is provided in each of the locking grooves on the inner circumferential surface. at least a two-part hollowed joint body having an engaging protrusion that fits;
A pair of bolts are planted in opposite end faces of the joint body, and the bolts are inserted through each other, and a pressing force from one direction along the axial direction acts to pull the joint body through the bolts. A connecting plate having an elongated hole formed at an angle of inclination to promote a fastening member, and a tightening member consisting of a nut screwed onto the bolt through the connecting plate, and a solid pipe buried between the edges of the joint pipe body. A pipe joint characterized in that the bottom is formed by an elastic packing inserted and supported between the outer peripheral surface of the end portion and the inner peripheral surface of the joint body.