JPH05630Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a steel pipe joint with a pull-out prevention function, which eliminates the need for welding during on-site construction, making the connection work of steel pipes easier, faster, and lower in cost. It is an object.

[Conventional technology]

Conventionally, various types of joints for steel pipes have been developed.
It has been put into practical use. Common types include flange joints and threaded joints, as well as P joints,
Q-joints, N-joints, Victory joints, etc. are known.

[Problem that the invention attempts to solve]

Joints for steel pipes are required to be easy to connect steel pipes and to not cause failures at the joints.
The former requires no on-site welding and easy joint construction, while the latter requires a reliable seal, a slip-out prevention function, and high earthquake resistance. In addition, it is also required that the joint cost be low, and it is also desired that the joint is not a dedicated joint.

Among the above-mentioned joints, the flange joint has problems such as lacking in functions such as elasticity and flexibility as a joint. Another problem was that the larger the diameter, the greater the cost of flange materials and processing. Threaded joints require threading at the pipe end and a socket, and in addition to lacking functions such as elasticity and flexibility as a joint, there is also the problem that the strength of the joint decreases because the thread is cut into the pipe body. Ta. Furthermore, this fitting is medium,
It was hardly used in large diameter pipes. P
Problems with the joint include the high processing cost of the pipe end socket, insufficient elasticity and flexibility, and the fact that the pipe-removal prevention bolt is likely to cause corrosion. Q-joints require on-site welding, are limited to large-diameter pipes, require mortar filling on the outside of the pipe to prevent corrosion at the welded part, and require painting and repair of the inner welded part. There were problems such as high joint cost. N-joints required a special joint, were expensive, and had problems such as lack of a pull-out prevention function. Victory type joints require a lot of effort in machining the pipe ends, require special joints, and are expensive.

[Means for solving problems]

The present invention provides a steel pipe joint that solves these problems, by providing a socket for the steel pipe to be connected to the end of one of the steel pipes, sealing the gap between the socket and the steel pipe with an elastic ring, and connecting the pipe to the other end. The above object has been achieved by employing a system in which a stop ring attached to the mouth engages a stop piece attached to a steel pipe inserted into the socket.

The socket usually has a short tubular shape, but if greater flexibility is required, the socket may be shaped with a bulge in the shape of an arc, for example. If necessary, the end of the socket may be made into an expanded shape to facilitate insertion of the steel pipe.

The inner diameter of the stop ring is such that a connecting steel pipe can be inserted with clearance, and a plurality of notches are provided on the inner peripheral edge. The mounting position should be a little away from the end of the socket to ensure at least a space for the elastic ring part. If the stop ring is installed closer to the end of the socket, it will have greater elasticity and flexibility, but in order to increase the stability of the connection, it is better to install it as far back as possible, and with these considerations in mind, it is necessary to It is determined to ensure stretchability and flexibility.

The notches are for allowing the stop piece to pass through, and are therefore provided at each location corresponding to the stop piece with a size that allows the stop piece to pass through.
In principle, the number of notches is the same as that of the stop piece, but it is also possible to provide more than the stop piece, for example, with some as a reserve.

A plurality of small stop pieces are provided on the side of the steel pipes to be connected. The appropriate number varies depending on the diameter of the steel pipe, but is about 2 to 12, usually about 3 to 6. The shape may be any shape as long as it can be locked onto the stop ring.
The insertion side may be tapered to facilitate insertion.
The stop pieces are usually equally spaced throughout. As a general rule, the installation location is near the end of the steel pipe.

The elastic O-ring seals the gap between the socket and the steel pipe, and is attached to the rear of the stop piece of the steel pipe that is inserted into the socket, that is, at the center of the steel pipe. This elastic O-ring is mounted so that it can roll when the steel pipe is inserted. An appropriate material is selected depending on the purpose of use of the steel pipe. For example, when used as a water pipe, water-stopping performance can be enhanced by using super absorbent rubber alone or in combination. The number of elastic O-rings is not limited to one, and a plurality of elastic O-rings may be provided as appropriate.

A restraining ring for preventing the elastic O-ring from leaving the socket is fixed further behind the elastic O-ring on the steel pipe to which the elastic O-ring is attached. Separation of the elastic ring from the tube end can be prevented by a stop ring, but this prevention mechanism can also be provided separately.

The steel pipe joint of the present invention can also be provided with other mechanisms. For example, a stopper pin or a claw may be added to prevent the stop piece once inserted from passing through the notch backwards and coming off.

It goes without saying that this steel pipe joint can be used not only to connect pipes of the same diameter, but also to connect pipes of different diameters.

The steel pipe joint of this invention aligns the stop piece with the notch in the stop ring and pushes the steel pipe into the socket.
The steel pipes can be connected by rotating one of the steel pipes by an appropriate angle.

Although the joint of the present invention was developed for use with steel pipes, it can be widely used with other pipe bodies as long as they can be provided with a stop piece.

[Effect]

The diameter of the socket body is large enough to provide a sufficient gap between the socket body and the steel pipe to allow flexibility at the steel pipe joint, and the range of flexibility is determined by the clearance between the two and the position of the stop ring. It is designed so that it can be adjusted. Expansion and contraction between the steel pipes is ensured by sealing between the socket and the steel pipe with an elastic ring and allowing the steel pipe to move back and forth, and its range can be adjusted by the mounting position of the stop ring and stop piece. That's what I do. By providing a clearance between the stop ring and the steel pipe, and by making the stop piece into a small piece, flexibility at the steel pipe joint is ensured.

[Example] The first side view is a cross-sectional view of the upper half of the joint, which is an example of the present invention, before the steel pipes are connected.
2, and a sectional view taken along the line A-A is shown in FIG. Further, FIG. 3 shows a partially enlarged sectional view of the side surface of the connecting portion in a state where the steel pipes are connected.

As shown in these figures, a socket 3 for the other steel pipe 2 to be connected to the pipe end of one steel pipe 1 is provided,
A stop ring 4 in the shape of an annular plate is fixed to the inner peripheral surface of the socket 2. A stop piece 5 is fixed to the outer peripheral surface near the end of the other steel pipe 2. As shown in FIG. 2, the inner peripheral edge of the stop ring 4 is provided with four inverted trapezoidal notches 6 at equal intervals. As shown in FIG. 1, a rubber O-ring (elastic ring) 7 is fitted at the rear of the stop piece 5 of the steel pipe 2, and further rearward thereof prevents the ring 7 from leaving the socket. A circular bar restraining ring 8 is fixed by welding.

FIG. 4 is a sectional view taken along line B-B in FIG. 3, and FIG. 5 is a sectional view taken along line C-C in FIG. As shown in these figures, the stop piece 5 has a trapezoidal cross section in the pipe radial direction that is approximately similar to the notch 6, and the upper surface and both side surfaces on the insertion side are tapered to facilitate insertion. There is. 4 stop pieces 5
are all the same shape and size, so steel pipe 1 and steel pipe 2
This means that the stop piece 5 and notch 6 are aligned every 90 degrees and can be pushed in. As shown in FIG. 3, the socket 3 is made of a short pipe, and the base end side is welded to the end of the steel pipe 1 via a ring-shaped rod. On the other hand, the inner corner of the open end is cut obliquely to facilitate the pushing of the steel pipe 2, and a push-in guide ring 9 is further welded and fixed to the outer edge.

To connect the steel pipes, align the notch 6 and the stop piece 5, and connect the steel pipe 2 to the socket 3 of the steel pipe 1.
When pushed in, the O-ring rolls and the tube end enters the inside as shown in FIG. After the stop piece 5 passes through the notch 6, if one of the steel pipes 1 or 2 is rotated, for example, by 45 degrees, the stop piece 5
can be engaged with the stop ring 4, and the connection is completed in the state shown in FIG.

The steel pipe joint of the present invention is not limited to this example, and various modifications can be made. The example in Fig. 8 is an example in which the central part of the socket 3 is bulged to increase the flexibility of the joint part, and the example in Fig. 9 is an example in which a circular bar is used as a spacer for joining the proximal end of the socket. This shows an example using a thick plate. Figs. 10 and 11 show examples of connecting steel pipes with different diameters, Fig. 10 shows an example using a tapered socket 3, and Fig. 11 shows an example using an arc-shaped socket 3. It is something.

[Effect of idea]

The joint of this invention does not require on-site welding, making it easy to connect steel pipes.Furthermore, the flexibility and stretchability of the steel pipes can be ensured at the joint, making the work of connecting steel pipes easier. . In addition to these features, it also has a pull-out prevention function, so it has high earthquake resistance and allows steel pipes to be connected for a long period of time without failure. The structure is simple, and both the joint price and construction cost can be reduced.

[Brief explanation of drawings]

FIG. 1 is a side view showing a cross-sectional view of the upper half of a joint according to an embodiment of the present invention before steel pipes are connected, and FIG. 2 is a cross-sectional view taken along line A--A.
Fig. 3 is a partially enlarged sectional view of the side surface of the connecting part in a state where the steel pipes are connected, and Fig. 4 is a B--
A sectional view of section B, and FIG. 5 is a sectional view of section C- in FIG.
It is a sectional view of section C. FIG. 6 is a side view showing a state in which the connection is in progress, and FIG. 7 is a cross-sectional view of the upper half, showing a state in which the connection is completed. Figures 8 to 11 show other embodiments of the present invention, with Figure 8 being a side view in section of the upper half of an example with a bulging socket, and Figure 9 being A side sectional view of a connecting part showing an example in which the method of joining the socket to the steel pipe has been changed, and a 10th
The drawing shows a tapered socket, and FIG. 11 is a side view showing a section of the upper half of an example in which the socket is arcuate and steel pipes of different diameters are connected. 1, 2... Steel pipe, 3... Socket, 4... Stop ring, 5... Stop piece, 6... Notch, 7
. . . O-ring (elastic ring), 8 . . . Deterring ring (mechanism for preventing detachment), 9 . . . Push-in guide ring.

Claims (1)

[Scope of utility model registration request] A socket for the other steel pipe to be connected to the pipe end of one steel pipe is fixed, and the other steel pipe can be inserted into an appropriate position on the inner peripheral surface of the socket with a clearance, and a plurality of notches are provided on the inner peripheral edge. a plurality of small stop pieces that can pass through the notch and be locked to the stop ring are fixedly installed at a portion of the outer circumferential surface near the end of the other steel pipe corresponding to the notch; At the rear of the stop piece of the steel pipe, an elastic O-ring is fitted to seal between the socket and the other steel pipe, and a restraining ring is fixed to prevent the elastic ring from coming off outside the socket. Steel pipe fittings.