JP2000035176A - Joint for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly prevent fluid leakage from a fitted part with a piping in forming a bent channel. SOLUTION: This joint is furnished with roughly cylindrical joint main bodies 4 respectively fitted on end parts of neighboring pipes 1 and a roughly cylindrical spacer 5 interposed between these joint main bodies 4. This spacer 5 is formed by cutting out both end surfaces of the joint main bodies diagonally against shaft cores. As the joint main bodies 4 are roughly cylindrically formed, they can store the end parts of the piping 1 formed cylindrical in the same way along specified length. Consequently, the piping 1 is never diagonally inserted and fitted against a pipe joint 2, and safety can be secured by preventing fluid leakage from a fitted part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting ends of adjacent pipes, and more particularly, to a pipe joint for connecting a building pipe having a relatively large diameter.

[0002]

2. Description of the Related Art In the field of construction and civil engineering, pipes having a relatively large diameter are used for constructing flow paths and the like. At the time of channel construction, there is a limit to increasing the length of one pipe itself, so a plurality of pipes are arranged and a short cylindrical pipe joint is provided between these pipes. I have. The flow paths using these pipes and joints are often arranged in a straight line, but may be bent in the middle as necessary. For example, in an agricultural canal,
If there is an obstacle such as a river in the middle of the waterway, bend the underground agricultural waterway up or down to crawl above or below the river, or bend it left and right so as to avoid obstacles. I have.

[0003] Conventionally, in order to bend a channel,
Steel, Duck, and FRP deformed pipes (vent pipes) are manufactured to order, and as a rule, curved pipes are made to match the local angle with one deformed pipe for each intersection angle. However, the vent pipe is, in principle, an odd-shaped pipe at one intersection angle, and the type of piping increases. Therefore, it is conceivable that the pipe is not formed as a deformed pipe but is formed as a curved pipe at a minute angle (for example, 2 ° to 5 °) using a straight pipe. In other words, the straight pipe has an inclination angle at which its fitting is allowed to the joint, and the pipe is curved at a very small angle. Inserted obliquely.

[0004]

However, if a straight pipe is inserted obliquely into the joint within the range of the allowable inclination angle, if the inclination angle is not appropriate, the straight pipe joint and the straight pipe joint will not be fitted. Fluid pressure concentrates on the fitting portion with the pipe. Therefore, not only cannot a smooth flow of the fluid be ensured, but also, at worst, there is a disadvantage that the fluid flows out from the fitting portion.

An object of the present invention is to provide a pipe joint which can reliably prevent fluid from flowing out of a fitting portion with a pipe when a bent flow path is formed.

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention is to achieve the above object by bending and forming a pipe joint for connecting ends of adjacent pipes. Specifically, the pipe joint of the present invention has a substantially cylindrical joint body fitted to each end of an adjacent pipe, and a substantially cylindrical spacer interposed between these joint bodies. This spacer is characterized in that an end face to be joined to at least one of the joint main bodies is formed so as to be notched obliquely with respect to an axis.

According to the present invention, a pipe joint is manufactured at a factory or a site in a state where a shaft core is bent from a substantially cylindrical joint body and a spacer. Further, a plurality of straight pipes are manufactured in a factory, and these pipes are transported to a site by a truck or the like together with pipe joints, and are temporarily stored in a material storage place or the like before construction. To form a bent channel at the site, the end of the straight pipe is joined to the joint body. The fitting between the joint body and the end of the pipe is
The pipe is pressed against the joint body in the same manner as the normal fitting method between the joint and the pipe.

[0008] Therefore, in the pipe joint of the present invention, since the joint main body has the same structure as the end of the normal joint, the fitting to the straight pipe is performed in the same manner as the normal joint. . Therefore, since the pipe is not inserted obliquely to the joint and fitted, the fluid pressure does not concentrate on the fitted portion, and the outflow of fluid from the fitted portion is prevented to ensure safety. Can be. In particular, if the bending angle of the pipe joint is set to a small angle (for example, 2 ° to 5 °), safety can be further improved. Moreover, in the present invention,
Even in the case of forming a bent flow path, a relatively long pipe itself can be used in a straight line without bending, so that pipes having different diameters among these pipes are concentric. The space saving of transportation and storage of piping can be achieved by arranging the pipes. In addition, the pipe joint is formed by bending, but the pipe joint has a shorter axial length than the pipe itself, so that no space is required for transportation and storage.

Here, in the present invention, the pipe is a pipe for civil engineering construction, for example, an agricultural pipe used for constructing an agricultural waterway, a civil engineering pipe used for constructing water supply and sewerage, and the like. A pipe that requires an extremely large diameter is preferable. Further, in the pipe joint, it is preferable that an outer peripheral surface of a joint portion between the joint body and the spacer is covered with a tape-shaped member. With this configuration, it is possible to prevent the fluid from leaking from the joint between the joint body and the spacer.

[0010] Further, the joint body has an elastomer member at an inner peripheral portion thereof, and the elastomer member is provided with a pair of waterproof projections which are arranged to face each other and press the outer peripheral surface of the pipe. May be available. In this configuration, since the pipe joint is formed integrally with the elastomer member previously provided on the joint body, a member for joining the pipe joint and the pipe in a watertight state, such as a joint ring, a rubber ring, and a press ring Are not required.

It is preferable that the spacer has a stopper on an inner peripheral portion thereof for positioning and regulating an end of the pipe. In this configuration, the end of the pipe is pushed into the pipe joint to connect the pipe to the pipe joint.
When the end of the pipe abuts on this stopper, the movement of the end of the pipe is further restricted. For this reason, the fitting state of the piping of the piping joint is not such that one of the pipings is deep and the other is shallow, so that the piping of the piping joint can be properly joined.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing a state in which a plurality of pipes are connected using the pipe joint of the present embodiment. In FIG. 1, a plurality of pipes 1 are arranged in series to form a flow path bent at an angle β, and a pipe joint 2 and a straight joint 3 according to the present embodiment are interposed between these pipes 1. It is interposed. These pipes 1 are pipes for civil engineering construction, for example, agricultural pipes used for constructing agricultural waterways, civil engineering pipes used for constructing water supply and sewerage, and the like. The pipe 1 is a circular pipe having a relatively large diameter (for example, 1 m or more) made of an appropriate material such as FRP (glass fiber reinforced plastic) or concrete, and is formed in a straight line extending in the axial direction. .

The specific structure of the pipe joint 2 is shown in FIG. 2 and FIG. FIG. 2 is a front view of the pipe joint 2 connected to the pipe 1, and FIG. 3 is a partially cutaway front view of the pipe joint 2. In these figures, a pipe joint 2 has a substantially cylindrical joint body 4 whose outer peripheral surface is fitted to an end of an adjacent pipe 1, and a substantially cylindrical joint body 4 interposed between these joint bodies 4. And a tape-like member 6 covering an outer peripheral surface of a joint portion between the joint body 4 and the spacer 5.

The joint body 4 includes a cylindrical member 7 made of FRP (glass fiber reinforced plastic) and an elastomer member 8 provided on an inner peripheral portion of the cylindrical member 7. This elastomer member 8 is a cylindrical member 7
And a pair of waterproof projections 8B provided on the inner peripheral surface of the cylindrical portion 8A and pressing the outer peripheral surface of the pipe 1. These members 8A, 8B SR
B, formed integrally from other elastomers.

The waterproof projection 8B has two projections as an example. The protruding portions are inclined inward so as to face each other, and are waterproof so that water does not enter from the outside after connecting the pipes 1 adjacent to each other. When the pipe 1 is inserted into the pipe joint 2, the projection 8B is elastically deformed so as to fall (see the imaginary line in FIG. 3). In the first embodiment, the number of protrusions constituting the waterproof protrusion 8B is not limited to two, but may be one or three or more.

The spacer 5 is formed such that both end surfaces thereof are cut obliquely with respect to the axis so that the axes of the joint bodies 4 on both sides thereof are inclined by an angle α. A cylindrical spacer body 9 having a substantially triangular front face
And a stopper 10 provided on the inner peripheral portion of the spacer body 9 to regulate the position of the end of the pipe 1.
Although only one spacer 5 is shown in the figure, a plurality of spacers 5 may be used in a connected state as needed.

The inclination angle α can be appropriately set, and is preferably set in the range of 2 ° to 10 °.
However, in order to set the flow path bending angle β to 45 °, the inclination angle α is set to a multiple of 45 °, for example, 22.5 °, 15 °, 7.5 °, etc., and the flow path bending angle is set. In order to set the bending angle β to 30 °, one-third angle of 30 °, for example, 15 °, 10 °
Set the tilt angle α to ゜, 7.5 °, etc. When the inclination angle α is large, a stopper member (not shown) is provided on the spacer 5 as necessary to prevent the pipe 1 from accidentally coming off the spacer 5. You may.

The spacer body 9 is made of FRP, and is formed so that its outer peripheral portion is continuous with the outer peripheral portion of the joint main body 4. The stopper 10 is formed in a cylindrical shape from an elastomer having a height dimension sufficient for the end face of the pipe 1 to abut, and has such a hardness that it does not deform even when the end of the pipe 1 is pressed. The joint body 4 and the spacer 5 are bonded and fixed with a putty in which glass fiber is mixed into unsaturated polyester. Similarly, even when a plurality of spacers 5 are connected and used, the spacers 5 are bonded and fixed with a putty in which glass fiber is mixed with unsaturated polyester.

The tape-shaped member 6 has a width sufficient to cover an outer peripheral surface of a joint portion between the joint body 4 and the spacer 5, and is formed in a band shape containing unsaturated polyester in a glass fiber mat. The tape-shaped member 6 is bonded to the outer peripheral surfaces of the joint body 4 and the spacer 5 with a putty in which glass fiber is mixed with unsaturated polyester. The linear joint 3 has the same basic structure as the spacer body 9, and its axial length is longer than the spacer body 9.

A method of forming a flow path such as an agricultural waterway using the pipe 1, the pipe joint 2 and the linear joint 3 thus configured will be described. First, in a factory, the pipe 1 and the linear joint 3 are manufactured, and the joint body 4 and the spacer 5 constituting the pipe joint 2 are manufactured. 30 ゜, 4
In order to form a bent channel of 5 °, 60 ° or 90 °, the inclination angle α of the spacer 5 is set to 7.5 °. The joint body 4 may be manufactured by cutting the linear joint 3 on site. These members are transported to the site by a transportation means such as a truck. In a carrier such as a truck, a plurality of pipes 1 having different diameters are arranged concentrically. Similarly, a plurality of linear joints 3, joint bodies 4, and spacers 5 having different diameters are arranged concentrically. When these members are transported to the site, they are stored in the site in the same manner as they are transported, if necessary.

In order to form a straight channel at the site,
In order to alternately connect the pipe 1 and the linear joint 3 to form a bent flow path, the pipe 1 and the pipe joint 2 according to the present embodiment are alternately connected. The connection is made by pressing the end of the pipe 1 against the inside of the pipe joint 2. Piping joint 2
Is provided with a stopper 10, so that the pipe 1 is positioned at a predetermined position. Prior to the connection work, the pipe joint 2 is assembled on-site.
The joint body 4 is joined to both ends of the joint, and the outer peripheral surfaces of these joints are covered with the tape-like member 6.

Here, when the curvature of the flow path is gentle,
The piping joint 2 is assembled by interposing one spacer 5 between the two joint bodies 4. The inclination angle α of the spacer 5 is 7.
If it is 5 °, a flow path having a bending angle β of 30 ° can be formed by using four pipe joints 2,
By using six pieces, a flow path having a bending angle β of 45 ° can be formed. On the other hand, when the curvature of the flow path is steep, the piping joint 2 is assembled by interposing a plurality of, for example, two spacers 5 between the two joint bodies 4. If the inclination angle α of the spacer 5 is 7.5 °, a flow path having a bending angle β of 30 ° can be formed by using two of the pipe joints 2 and can be folded by using three of them. Bending angle β
Can form a 45 ° flow path.

Therefore, in the present embodiment, a substantially cylindrical joint body 4 fitted to the end of the adjacent pipe 1 is provided.
The pipe joint 2 is provided with a substantially cylindrical spacer 5 interposed between the joint bodies 4.
Is formed by cutting both ends of the joint body 4 obliquely with respect to the axis. Therefore, when the pipe joint 2 and the pipe 1 are joined to form a bent flow path, the joint body 4 Since the pipe 4 is formed in a substantially cylindrical shape, the end of the pipe 1 also formed in a cylindrical shape can be stored over a predetermined length. Therefore, since the pipe 1 is not obliquely inserted and fitted into the pipe joint 2, the fluid pressure does not concentrate on the fitted portion, and the outflow of the fluid from the fitted portion is prevented, thereby ensuring safety. Can be secured. In particular, 1
Since the bending angle of each of the pipe joints 2 is set to a minute angle of 7.5 °, the bending angle of the flow path itself can be made gentle, and safety can be further improved.

Moreover, the pipe 1 itself formed relatively long can be a straight pipe without bending. Therefore, by arranging the pipes 1 having different diameters on the concentric circles, it is possible to save space for transporting and storing the pipes 1. Similarly, in the pipe joint 2, since the joint body 4 and the spacer 5 are manufactured separately in a factory, the space for transportation and storage of these can be reduced.

In this embodiment, since the outer peripheral surface of the joint between the joint body 4 and the spacer 5 is covered with the tape-like member 6 in the pipe joint 2, the joint between the joint body 4 and the spacer 5 is formed. It is possible to prevent the fluid flowing through the flow path from leaking from the portion. Further, the joint main body 4 has an elastomer member 8 at an inner peripheral portion thereof, and the elastomer member 8 is provided with a pair of waterproof projections 8B which are disposed to face each other and press the outer peripheral surface of the pipe 1. Since there,
A member for joining the pipe joint 2 and the pipe 1 in a watertight state, for example, a connecting ring, a rubber ring, a pressing ring, and the like are not required.

Since the spacer 5 has a stopper 10 at its inner periphery for regulating the position of the end of the pipe 1, the end of the pipe 1 is connected to the pipe joint 2 in order to connect the pipe 1 to the pipe joint 2. When the end of the pipe 1 comes into contact with the stopper 10 when the end is pushed into the joint 2, the movement of the end of the pipe 1 is further restricted. Therefore, the pipe joint 2
The fitting state of the pipe 1 does not mean that one pipe 1 is deep and the other pipe 1 is shallow, so that the pipes of the pipe joint 2 can be properly joined.

Furthermore, since the basic angle is set as the inclination angle α of the spacer 5 and the number of the spacers 5 is appropriately changed, even if the bending angle β of the flow path is different, the pipe joint 2 can be formed. The number of parts can be reduced. For example, if the inclination angle α of the spacer 5 is 7.5 °, the bending angle β of the flow path can be set to 30 ° by preparing four spacers 5, and by preparing six spacers 5
The bending angle β of the flow path can be set to 45 °.

The present invention is not limited to the above-described embodiment, and includes the following modifications as long as the objects of the present invention can be achieved. For example, in the above embodiment, the stopper 10 provided on the inner periphery of the cylindrical portion 8A of the elastomer member 8 is formed in a cylindrical shape. However, in the present invention, the stopper 10 can restrict the positioning of the end of the pipe 1. If so, the shape is not limited. For example, one or a plurality of grooves may be formed in the inner periphery along the axial direction. One or more pin-shaped members may be provided upright. Further, the stopper 10 does not always need to be provided.

Further, according to the present invention, the pipe joint 2
May be manufactured. In this case, the pipe joint 2 is formed by bending, but since the pipe joint 2 has a shorter axial length than the pipe itself, no space is required for transportation and storage. Furthermore, although both end faces of the spacer 5 are formed so as to be cut out obliquely with respect to the axis, in the present invention, at least one end face of the spacer 5 may be formed so as to be cut out obliquely.

[0030]

As described above, according to the present invention, a substantially tubular joint body fitted to the end of each adjacent pipe is provided.
Since a substantially cylindrical spacer is provided between these joint bodies, at least one end surface of the joint body is formed by being cut out obliquely with respect to the axis.
When forming a bent channel, the pipe is not obliquely inserted and fitted into the pipe joint, so that fluid pressure does not concentrate on the fitting part, preventing the outflow of fluid from the fitting part. Safety can be ensured. Further, a straight pipe having a relatively long length can be used without being bent. for that reason,
By arranging these pipes having different diameters on concentric circles, it is possible to save space for transporting and storing the pipes.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a plurality of pipes are connected using a pipe joint according to an embodiment of the present invention.

FIG. 2 is a front view of the pipe joint in a state where the pipe is connected.

FIG. 3 is a front view in which a part of a pipe joint is broken.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 2 Piping joint 4 Joint main body 5 Spacer 6 Tape-shaped member 8 Elastomer member 8B Waterproof projection 10 Stopper

Claims (5)

[Claims] A substantially cylindrical joint body fitted to an end of an adjacent pipe, and a substantially cylindrical spacer interposed between the joint bodies. An end face joined to at least one of the joint main bodies is formed so as to be notched obliquely with respect to an axis. 2. The pipe joint according to claim 1, wherein said pipe is a pipe for civil engineering construction. 3. The joint according to claim 1, wherein an outer peripheral surface of a joint between the joint body and the spacer is covered with a tape-shaped member. 4. The joint for piping according to claim 1, wherein said joint body has an elastomer member on an inner peripheral portion thereof, and said elastomer members are arranged to face each other and an outer periphery of said piping is provided. A pipe joint comprising a pair of waterproof projections for pressing surfaces. 5. The piping joint according to claim 1, wherein said spacer has a stopper on an inner peripheral portion thereof for positioning and regulating an end of said piping. Fittings.