JP4778297B2 - Method for connecting pipe and pipe joint and push ring used for the connection method - Google Patents

Description

The present invention relates to a method for connecting a medium to large-diameter pipe for water, particularly for waterworks, and a fitting for use in the connection method.

A conventional connection of the pipe and the pipe joint in a water supply pipe made of, for example, a large-diameter ductile cast iron pipe having a diameter of 500 to 2600 mm will be described with reference to FIGS. 7 is a sectional view showing a conventional connection structure, FIG. 8 is a front view of a conventional push wheel, FIG. 9 is a partially cutaway side view of the conventional push wheel, and FIG.

7 to 10, in the conventional connection method, a rubber wedge wedge seal ring 94 pushed into the gap between the outer periphery of the insertion end portion 11 of the pipe 1 and the inner periphery of the receiving port 21 of the pipe joint 2, A pressure ring 93 that is fastened to the receiving port 21 side of the pipe joint 2 in order to push the seal ring 94, and a pressure applied to the seal ring 94 by the push ring 93 that is interposed in the tube axis direction between the push ring 93 and the seal ring 94. Three members were used, including a pressure transmission split ring 99 that evenly distributes the pressure on the pressure receiving end surface on the rear end side of the seal ring 94.

In FIG. 7, the push ring 93 is fastened to the receiving port 21 of the pipe joint 2 via the fastening bolt 5, so that the seal ring 94 is pushed in tightly through the pressure transmission split ring 99 by the push ring 93 and is tightly fitted. The pipe 1 and the pipe joint 2 were connected by the ring 94 and the fastening bolt 5.

However, the conventional pressure transmission split ring 99 and the press wheel 93 are manufactured as an integrally molded finished product, in particular, though the press wheel 93 has a considerable weight, is extremely large in plan, and is bulky. .
For example, in the case of the split ring 99, the steel sheet is blown out, and in the push ring 93, the material structure is integrally formed by casting a spheroidal graphite cast iron material, and then processed into a required shape by machining or the like. It was.

Therefore, for example, the press wheel is inferior in productivity and inconvenient to transport and transport the product. In particular, in connection work such as assembly in which the presser wheel 93 is axially mounted on the outer peripheral side of the tube insertion end at the connection site, many skilled workers and heavy machinery are required, and connection takes time and effort. It was.

The present invention aims to solve the above problems, and provides a connection method that facilitates connection work between a pipe and a pipe joint and has excellent sealing performance, and a push ring that is excellent in productivity and easy to handle, used in the connection method. With the goal.

The invention of the method for connecting a pipe and a pipe joint according to claim 1, when connecting the insertion end of the pipe to the receptacle of the pipe joint,
A seal ring having a wedge-shaped cross section that is tightly fitted between the insertion end and the receiving opening and a push ring that pushes the sealing ring into the receiving opening are temporarily attached to the outer periphery of the insertion end, and tightened. In the connection method of pushing the seal ring into the receiving port by fastening the push ring to the pipe joint via an attached bolt, and connecting the pipe and the pipe joint,
The press wheels divided into a plurality of components that can be assembled in a return shape are provided with contact surfaces that overlap each other in the axial direction of the tube with the ends of the adjacent components on the both ends of each component. Complementary concave portions that fit each other as they are tightened are provided on one of the contact surface portions, the convex portion is provided on the other contact surface portion, and the concave and convex portions are used as guide members.
A plurality of constituent parts are assembled and mounted in a return shape on the outer periphery of the insertion end.

According to a second aspect of the present invention , in the method for connecting a pipe and a pipe joint according to the first aspect , the concave and convex portions to be fitted to each other are loosely fitted so as to be in a temporarily mounted state at the stage of tightening, and tightened. Accordingly, a plurality of components are gradually assembled into a regular refund.

A third aspect of the present invention is the connecting method between the pipe and the pipe joint according to any one of the first to second aspects, wherein a return-like convex formed on the press ring when the connection between the pipe and the pipe joint is completed. A feature is characterized in that the strip portion is closely fitted in a return-shaped concave groove formed in the seal ring.

According to a fourth aspect of the present invention , in the method for connecting a pipe and a pipe joint according to any one of the first or third aspects, the tightening bolt is passed through the contact surface portion.

In the invention of claim 5, when the insertion end of the pipe is connected to the receptacle of the pipe joint,
A seal ring having a wedge-shaped cross section that is tightly fitted between the insertion end and the receiving opening and a push ring that pushes the sealing ring into the receiving opening are temporarily attached to the outer periphery of the insertion end, and tightened. In the pusher wheel used for the connection method of pushing the seal wheel into the receiving port and connecting the pipe and the pipe joint by tightening the pusher wheel to the pipe joint via an attached bolt,
On both end sides of each component part of the push wheel , there are provided contact surface portions that overlap each other in the axial direction of the tube with the ends of the adjacent component portions, and the mutual contact surface portions are fitted to each other to the extent that they are tightened. A matching complementary concave portion is provided on one abutting surface portion, and a convex portion is provided on the other abutting surface portion, and is divided into a plurality of components that can be assembled in a return shape on the outer periphery of the insertion end portion. A push wheel.

According to a sixth aspect of the present invention , in the press wheel according to the fifth aspect, the concavo-convex portions to be fitted to each other are loosely fitted so as to be in a temporarily mounted state at the start of tightening, and gradually a plurality of constituent parts according to the tightening. It is characterized by having a complementary shape assembled into a regular refund.

The invention according to claim 7 is the press ring according to claim 5 or 6 , wherein when the connection between the pipe and the pipe joint is completed, a return-shaped convex portion formed on the press ring is formed on the seal ring. It is characterized in that it is configured to be closely fitted in the returned concave groove.

The invention of claim 8 is the junk ring according to any one of claims 5 to 7, characterized in that a bolt hole through which the clamping bolt abuts surface.

The invention of claim 9 is the junk ring according to any one of claims 5 to 7, the pressing ring is characterized in that a plurality of components that constitute the pressing ring is arcuate member having the same shape.

According to the first to ninth aspects of the present invention, the pressure transmission split ring is formed integrally with the press ring among the three members of the press ring, the pressure transmission split ring and the seal ring which have been conventionally used. In addition to the two members of the push ring and the seal ring, the push ring, which is heavy and difficult to handle, is divided into a plurality of components so that it can be mounted by assembling from the outer peripheral side of the pipe. Therefore, the connecting work between the pipe and the pipe joint is facilitated as compared with the connecting work in which the integrally formed press ring is attached to the pipe from the pipe axis direction by using many hands and heavy machinery as in the prior art.
In addition, the press wheel used for the connection method is not integrated in a return shape, but can be produced separately for each component that can be assembled in the return shape, so that it is excellent in productivity and easy to handle.

According to the first or fifth aspect of the invention, in any case, positioning in the assembling work becomes easy, and the connecting work can be performed easily and quickly.

According to the second or sixth aspect of the present invention, assembling and fastening operations can be performed easily and quickly.

According to the invention of claim 3 or claim 7 , in any case, by fitting the ridge portion to the groove, the pressure applied to the seal ring by the push ring can be more effectively dispersed, and the sealing performance is excellent. Connection method can be provided.

According to the fourth or eighth aspect of the present invention, since the fastening bolts are passed through the contact surface portions that are overlapped on both ends of the plurality of constituent parts assembled so as to form a return shape, the fastening bolts are loosely tightened. By simply penetrating the bolt, it is easy and quick to form a return shape by temporary mounting. After that, by simply tightening the fastening bolt as appropriate, a return press ring is naturally formed, and the original integrated molding is achieved. A push wheel having the same strength and robustness as the push wheel can be obtained, and the pipe and the pipe joint can be reliably connected.

According to the invention of claim 9 , since the press wheel is subdivided into a plurality of constituent parts and has the same shape, it is excellent in productivity, easy to handle, and is an assembling operation, that is, temporary mounting to be returned. Work can be done easily and quickly.

Hereinafter, a pipe joint connection method and a press ring according to the present invention will be described with reference to FIGS. 1 to 7 for a duct joint cast iron pipe having a nominal diameter of 700 mm provided with an S2 type receptacle of the Japan Water Works Association standard.
1 is a cross-sectional view showing a connection structure, FIG. 2 is a front view of the press wheel, FIG. 3 is a left side view of the press wheel, FIG. 4 is a front view of the components of the press wheel, FIG. 5 is a right side view of FIG. FIG. 3 is a partially cutaway side view of a seal ring.

In FIG. 1, reference numeral 1 is a water pipe (hereinafter also referred to simply as a pipe), 2 is a pipe joint, 3 is a push ring, 4 is a seal ring having a wedge-shaped cross section, and 5 is a fastening bolt.
The figure shows a state in which the insertion end 11 of the pipe 1 is inserted into the receiving port 21 of the pipe joint 2, but the push ring 3 and the seal ring 4 are provided on the insertion end 11 of the pipe 1 in advance. Is temporarily attached.

Further, in the figure, the seal ring 4 is loosely inserted between the insertion end 11 and the receiving port 21, but the insertion end 11 of the push ring 3 is received by the pipe joint 2 via the tightening bolt 5. By gradually tightening the opening 21, the seal ring 4 enters the receiving port 21 from the wedge tip and is pushed in, sealing (sealing) the gap between the insertion end 11 and the receiving port 21, and receiving the receiving ring 21. The insertion end 11 (tube 1) from the opening 21 is prevented from falling off, and the tube 1 and the pipe joint 2 are connected.

The push wheel 3 of the embodiment is integrally formed (integrally formed) with the conventional push wheel 91 and the pressure transmission split ring 92 shown in FIG. 7 in contact with each other. In this way, the plurality of components 31, 31, 31, 31 are divided and configured so as to be assembled in a return shape so as to form one ring.
The illustrated pusher wheel 3 is formed of a constituent part 31 as four arc-shaped members equally divided into four in the same shape.

When arranged in a return shape on both ends of each component 31, the contact surfaces 32, which overlap with each other in the axial direction of the tube 1, are arranged at the ends (both ends) of the other adjacent components 31. 32 is provided.
Then, the opposing contact surface portions 32, 32, and thus the convex portion 33 on one (end) contact surface portion 32 side of each component 31, and the convex portion 33 on the other contact surface portion 32 side. A complementary concave portion 34 that fits in the axial direction (tube axis direction) of the tube 1 is provided to facilitate the positioning of the overlapping.

In this case, for example, the direction in which both or one of the convex portion 33 and the concave portion 34 (uneven portion 34, 33) are fitted to each other so as to reach a relatively close fitting state (tight fitting) from a relatively loose fitting state. In other words, if it is formed long in the tube axis direction, it can function as a guide member when fitting and assembling a plurality of constituent parts 31 in a return shape (when forming a return shape) by fitting indentations (34, 33). Can be made.

That is, as will be described in detail later, by providing such uneven portions (34, 33) on the contact surface portions 32, 32 on both ends of each component 31, a plurality of components can be provided at the start of tightening. When rotating 31 around the outer peripheral surface of the insertion end 11 in a return shape, or when connecting adjacent component parts 31 that are turned around in a return shape, the combination can be positioned easily and quickly. .

In order to use the fastening bolt 5 together, the component parts 31 are connected to each other by a bolt hole 35 penetrating the overlapping contact surface portions 32, 32, and in this embodiment, the bolt hole 35 is an uneven part that fits together. It is provided so as to pass through the axis of the part (34, 33).
Therefore, when the plurality of component parts 31 are turned around to the outer peripheral surface of the insertion end portion 11 in a stage before the start of tightening, the contact surfaces 32 and 32 where the component parts 31 to be connected are overlapped with each other. By simply screwing the fastening bolt 5 into the bolt hole 35 and loosely tightening it with a nut, the components 31 can be connected to each other, and a plurality of components 31 can be connected to the outer peripheral surface of the insertion end 11. Can be temporarily attached to a refund.

As described above, after temporarily mounting the plurality of component parts 31 in a return form, they are appropriately tightened in earnest. At the stage of starting the tightening, the fastening bolts 5 at appropriate positions are simply tightened appropriately. First, the concave and convex portions (34, 33) formed in a complementary shape are loosely fitted so as to be relatively temporarily attached from a loosely fitted state.

Further, by continuing further tightening, it is gradually tightly fitted naturally according to the fitting of the irregularities (34, 33), and physically like the conventional push wheel 91 in which the plurality of component parts 31 are integrally formed. As the single pusher wheel 3 is attached, it is securely assembled and assembled, and complete attachment of the pusher wheel 3 to the pipe 1 is completed. At the same time, the connection between the pipe 1 and the pipe joint 2 is also completed.

In FIG. 1 and FIG. 9, a concave groove 41 having a concave cross section is formed concentrically with the seal wheel 4 on the rear end portion of the seal wheel 4, that is, the surface pressed against the pusher wheel 3. A convex strip 36 is formed concentrically with the press ring 3 on the entire surface of the press ring 3 that presses the rear end portion of the seal ring 4 so that the concave groove 41 is closely fitted when the connection with the joint 2 is completed. As a configuration.

Since the pusher wheel 3 of this embodiment is composed of four arc-shaped components 31, the protrusion 36 is naturally formed in an arc shape for each component 31.
Moreover, the concave groove 41 here is a groove having a semi-spherical cross section, and the ridge portion 36 is a semi-spherical protrusion having a close fitting section in the concave groove 41. Any complementary shape can be used.

According to the above-described embodiment, when connecting the pipe 1 and the pipe joint 2 having a relatively large diameter, conventionally, the presser wheel 3 which takes a large space for integral molding and is bulky and heavy is provided with a plurality of relatively small rings. Since it is divided into the constituent parts 31, it is easy to carry and handle, and the connection work can be performed easily and quickly with only a small number of people without using a large apparatus such as a heavy machine.

Further, since the pusher wheel 3 can be composed of a plurality of components 31 having the same shape, the productivity is improved and an inexpensive pusher wheel can be provided.

In addition, in the conventional connection work, in order to make the gap between the outer circumference and the inner circumference uniform, centering work for gap adjustment that requires skill and time is required, but these troublesome work is completely unnecessary. Therefore, the connection work can be performed easily and quickly even if it is not an expert.

The present invention is not limited to the connection of pipes and pipe joints for waterworks having a relatively large diameter, and can be widely used not only for the use of pipes such as gas pipes but also for sewerage.

It is sectional drawing which shows a connection structure. It is a front view of a push ring. It is a left view of a press ring. It is a front view of the component part of a press ring. FIG. 6 is a right side view of FIG. 5. It is a partially cutaway side view of a seal ring. It is sectional drawing which shows the conventional connection structure. It is a front view of the conventional push ring. It is a partially cutaway side view of a conventional push wheel. It is a front view of the conventional pressure transmission split ring.

1 Pipe 11 Insertion End 2 Pipe Joint 21 Receiving Port 3 Pusher Wheel 31 Component (Pushwheel)
32 Contact surface portion 33 Convex portion 34 Concave portion 35 Bolt hole 36 Convex strip portion 4 Seal ring 41 Concave groove 5 Fastening bolt

Claims (9)

When connecting the insertion end of the pipe to the receiving port of the pipe joint,
A seal ring having a wedge-shaped cross section that is tightly fitted between the insertion end and the receiving opening and a push ring that pushes the sealing ring into the receiving opening are temporarily attached to the outer periphery of the insertion end, and tightened. In the connection method of pushing the seal ring into the receiving port by fastening the push ring to the pipe joint via an attached bolt, and connecting the pipe and the pipe joint,
The press wheels divided into a plurality of components that can be assembled in a return shape are provided with contact surfaces that overlap each other in the axial direction of the tube with the ends of the adjacent components on the both ends of each component. Complementary concave portions that fit each other as they are tightened are provided on one of the contact surface portions, the convex portion is provided on the other contact surface portion, and the concave and convex portions are used as guide members.
A connecting method between a pipe and a pipe joint, wherein a plurality of constituent parts are assembled in a return shape on the outer periphery of the insertion end. The uneven part are fitted to each other, according to claim tightening keep the stage of initiation is loosely fitted so as to be temporarily mounted state, gradually more components depending on the tightening is characterized in that it is assembled to form instead of the normal 1 The connection method of the pipe | tube and pipe joint of description. 2. When the connection between the pipe and the pipe joint is completed, the return-shaped convex portion formed on the push ring is closely fitted in the return-shaped concave groove formed on the seal ring. Or the connection method of the pipe | tube in any one of Claim 2 , and a pipe joint. Method of connecting the pipe and the pipe joint according to any one of claims 1 to 3, characterized in that passing the clamping bolt abuts surface. When connecting the insertion end of the pipe to the receiving port of the pipe joint,
A seal ring having a wedge-shaped cross section that is tightly fitted between the insertion end and the receiving opening and a push ring that pushes the sealing ring into the receiving opening are temporarily attached to the outer periphery of the insertion end, and tightened. In the pusher wheel used for the connection method of pushing the seal wheel into the receiving port and connecting the pipe and the pipe joint by tightening the pusher wheel to the pipe joint via an attached bolt,
On both end sides of each component part of the push wheel , there are provided contact surface portions that overlap each other in the axial direction of the tube with the ends of the adjacent component portions, and the mutual contact surface portions are fitted to each other to the extent that they are tightened. A matching complementary concave portion is provided on one abutting surface portion, and a convex portion is provided on the other abutting surface portion, and is divided into a plurality of components that can be assembled in a return shape on the outer periphery of the insertion end portion. A push wheel. The concavo-convex portions that are fitted to each other are loosely fitted so as to be in a temporarily mounted state at the start of tightening, and have a complementary shape in which a plurality of components are gradually assembled into a regular return shape according to tightening. The push ring according to claim 5 . During completion of connection between the pipe and the pipe joint according to claim, characterized in that it has a configuration in which convex portions of the shaped instead formed in the pressing ring is tightly fitted into place like groove formed in the seal ring 5 Or the press ring in any one of Claim 6 . The press ring according to any one of claims 5 to 7 , wherein a bolt hole for penetrating the tightening bolt is provided in the contact surface portion. The press ring according to any one of claims 5 to 7 , wherein a plurality of constituent parts constituting the press ring are arc-shaped members having the same shape.

Images