JPH1118262A - Connecting coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily provide a coupling which enables an underground pipe to be connected to a joint part, speedily and with light operating physical force and which ensures durability of use for a long time. SOLUTION: This coupling, designed for connecting an underground pipe 2 to a joint part 1 of a hand hole, a manhole and the like, is provided with a first cylindrical member 4 to be connected to the joint part 1, and a second cylindrical member 5 to be fitted and fixed to the outside of the end of the underground pipe 2. Here, it is made possible to insert and fit the second cylindrical member 5 into the first cylindrical member 4. Also, a ring member 7 is provided inside the first cylindrical member 4 or the second cylindrical member 5 for contacting both members, to prevent them from moving in a fit-release direction after the insertion of the cylindrical member 5 into the cylindrical member 4. The closer are the end parts of the second cylindrical member 5 or the first cylindrical member 4 to be inserted into the ring member 7 are tapered more. At the same time, closer an inclined guiding surface is formed to the inside surface of the ring member 7, the end side further inserted cylindrical member positioned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for connecting an underground pipe to a connecting portion such as a handhole or a manhole.

[0002]

2. Description of the Related Art As the connecting joint, for example, the one shown in FIG. 5 has been proposed. This has a collar 20A at the tip
Inner connector 20 having
In order to be screwed into the male screw part 20B formed on the outer surface of the base end part, the cylindrical member 22 composed of the outer connector 21 having the female screw part 21B formed on the inner surface of the tip part, and screwed into the underground pipe 2 A holder 23 to be externally fitted, and a collar 25 for moving the underground pipe 2 to which the holder 23 is externally fitted to a position where the tip of the tube 2 comes into contact with a packing 24 provided in the outer connector 21. doing. Therefore, the case where the underground pipe 2 is connected to the handhole 1 will be described. The inner connector 20 is inserted into the through hole 1A of the handhole 1 from the inside, and the handhole 1 is connected.
By screwing the outer connector 21 to the inner connector 20 from the outside of the through hole 1A, the inner connector 2
No. 20A and flange 21 provided on outer connector 21
A holds and fixes the handhole 1. 26 shown in the figure is a plate-like packing, and 27 is an O-ring. On the other hand, the collar 25 is fitted from the tip of the underground pipe 2 and the holder 23 is screwed along the spiral of the outer surface of the underground pipe 2 in this state. The underground pipe 2 with the holder 23 is inserted into the outer connector 21 so that the end of the pipe 2 comes into contact with the packing 24. Thereafter, the collar 25 is screwed into the screw portion 21C formed on the outer surface of the end of the outer connector 21, and the operation of connecting the underground pipe 2 to the handhole 1 is completed.

According to the above-mentioned means, in order to connect the underground pipe 2 to the outer connector 21 fixed to the handhole 1, not only the collar 25 must be screwed into the outer connector 21 but also. However, it is necessary to use a tool such as a wrench to fully tighten and secure. In particular, when connecting the underground pipe 2 to such a handhole 1, a large number of underground pipes 2 are connected to the handhole 1, which requires a great deal of time and labor for screwing. there were.

[0004] Further, in the case of fixing by screwing, since the tightening force differs depending on the individual or every number of times of tightening, the screwing may be loosened due to vibration caused by uneven settlement, earthquake or the like. In some cases, water may enter the inside of the underground pipe 2 and there is room for improvement.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned situation, the present invention is intended to solve the problem that the connection of the underground pipe to the connecting portion can be performed easily, quickly and with a light operating force, and for a long time. It is an object of the present invention to provide a connection joint that can be used well over the whole area.

[0006]

According to the present invention, there is provided a connecting joint for connecting an underground pipe to a connecting portion such as a handhole or a manhole. A first tubular member to be fixed, and a second tubular member externally fitted and fixed to the tip of the underground pipe, and the first tubular member and the second tubular member are configured to be able to be fitted and inserted. After the insertion of the first and second cylindrical members, a ring member for preventing movement of the first and second cylindrical members toward the fitting / removing side is provided inside the first or second cylindrical member, The second cylindrical member or the first cylindrical member to be inserted into the ring member is configured such that the insertion distal end portion is tapered toward the distal end side,
A connection joint was formed on the inner surface of the ring member by forming an inclined guide surface that is positioned outward as it approaches the cylindrical member insertion end. Therefore, by inserting the other tubular member, the second tubular member, or the first tubular member into the one tubular member, the first tubular member, or the second tubular member, the two are fitted together, and the one tubular member is inserted. The movement of the other cylindrical member to the fitting / removing side can be reliably prevented by the retaining function of the ring member provided in the above. In addition, when the two tubular members are fitted together, the tapered insertion distal end slides smoothly along the inclined guide surface of the ring member, so that the tubular member can be moved to the retaining position with a light operating force.

[0007] The first cylindrical member fixed to the connection portion has an uneven portion over a specific range from the vicinity of the outer surface of the connection portion to the outside toward the outside. For example, as shown in FIG. 1, after inserting the first tubular member 4 into the connecting portion 1, the epoxy putty P is applied to the inner and outer surfaces of the connecting portion 1 to fix the first tubular member 4. Even when a force F for moving inward due to uneven settlement or an earthquake acts on the thus fixed first cylindrical member 4, the uneven portion 4 </ b> D has a large resistance, and the inside of the first cylindrical member 4 has a large resistance. Movement to the side can be prevented.

By providing a flexible portion for allowing the second cylindrical member to slide within a set range with respect to the first cylindrical member, the second cylindrical member is allowed to slide due to uneven settlement or earthquake.
Even if a pulling force or pushing force acts on the cylindrical member,
The force can be absorbed by sliding the second cylinder member with respect to the first cylinder member.

The underground pipe connecting side end of the second cylindrical member is provided with a groove capable of housing an O-ring, and the underground pipe can be screwed into the second cylindrical member including the O-ring. At the same time, by configuring the groove so that the diameter becomes smaller toward the first cylinder member, the underground pipe can be fixed to the second cylinder member only by screwing the underground pipe into the second cylinder member. At the same time, the sealing process can be completed. Moreover, when the underground pipe is screwed into the second tubular member, the distance between the O-ring and the groove becomes narrower, so that the fixing force and the sealing force increase at the tip of the underground pipe.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, an underground pipe 2 for accommodating an electric wire in a handhole 1 installed as a connection portion for arranging the electric wire collectively in the ground is a joint for connection. 3. This connection joint 3 is shown in FIG.
As shown in FIG. 3, a first cylindrical member 4 made of synthetic resin and fixed to the through hole 1A formed in the handhole 1, a distal end portion of which can be inserted into the first cylindrical member 4, and a base member. Second cylindrical member 5 made of synthetic resin whose end is externally fitted and fixed to underground pipe 2
Are the main constituent members. The first cylindrical member 4 and the second
The tubular member 5 may be made of any material such as metal, ceramic, and hard rubber. As the connection section,
In addition to the handhole 1, a manhole or another connection box may be used.

The first cylindrical member 4 has a flange 4A at one end which is in contact with the inner surface of the handhole 1, as shown in FIG.
Projecting portions 4B, 4C protruding at the other end to form peripheral grooves 4a, 4b for accommodating an annular seal member 6 and a ring member 7, which will be described later, and a portion closer to the flange portion 4A than the intermediate portion in the longitudinal direction; That is, the first cylindrical member 4 fixed to the handhole 1
And an uneven portion 4D formed over a specific range from the vicinity of the outer surface of the handhole 1 to the outer side. Then, after penetrating the first cylindrical member 4 from the inside of the handhole 1 into the through hole 1A, an epoxy putty P is applied to the inner and outer surfaces of the handhole 1 to fix the first cylindrical member 4. Even when a force F for moving inward due to uneven settlement or an earthquake acts on the thus fixed first cylindrical member 4, the uneven portion 4 </ b> D has a large resistance, and the inside of the first cylindrical member 4 has a large resistance. Movement to the side can be prevented. Although the epoxy putty P is used for fixing the first cylindrical member 4, it may be fixed with something other than this.

As shown in FIG. 1, a cylindrical portion 4T between the projecting portion 4B and the uneven portion 4D is formed to have a relatively long dimension. It is possible to function as a flexible part for allowing sliding within the set range. In this embodiment, the set range is a range in which the second cylindrical member 5 can slide to the right in the drawing by 100 mm. However, the tensile force acting on the second cylindrical member 5 due to uneven settlement, earthquake, or the like. If it is very small, it may be about 50 mm, and the setting range is not limited to these. Further, the second cylinder member 5 is set at the maximum position where the second cylinder member 5 can be pushed into the first cylinder member 4 so as to be able to cope only with the pulling force acting on the second cylinder member 5. The pushing position of the second tubular member 5 with respect to the first tubular member 4 may be changed so that the force can be absorbed to some extent.

The second cylindrical member 5 has an insertion tip 5A having a tapered shape toward the tip, and a groove 5 provided with an O-ring 8 at the end of the underground pipe connection side so that the O-ring 8 can be installed therein.
B, the underground pipe 2 is configured to be screwable into the second cylindrical member 5 having the O-ring 8 therein, and the groove 5B is configured to have a smaller diameter toward the first cylindrical member 4. I have. Also, the insertion tip 5A of the inner surface of the groove 5B.
Inwardly projecting protrusions 5C are formed at two positions in the longitudinal direction, and the recesses 8A, 8A provided in the O-ring 8 are engaged with the protrusions 5C, 5C. Thus, the O-ring 8 can be prevented from rotating with respect to the groove 5B.

The second cylindrical member 5 is connected to the first cylindrical member 4.
To be deformed by pressing in the radially expanding direction.
An annular sealing member 6 made of rubber for sealing the space between the cylindrical member 5 and the first cylindrical member 4 in a sealed state is provided on the first cylindrical member 4.
Is fitted in the first circumferential groove 4a formed in the first groove. A second circumferential groove 4b is formed at a position closer to the underground pipe 2 with respect to the first circumferential groove 4a of the first cylindrical member 4, and a ring member made of soft vinyl chloride is formed in the second circumferential groove 4b. In order to abut the end surface 7A of the ring member 7, a second stepped portion 5a is provided on the second cylindrical member 5, and a second stepped portion is provided on the rear end in the insertion direction of the first stepped portion 5a. 5b. The first step 5a rises at a right angle to the outer surface, the second step 5b rises to the insertion start end side at about 45 degrees with respect to the outer surface, and the second step 5b When the ring member 7 is in the engaged state and the pulling force acting on the second cylindrical member 5 is small, the engaged state is maintained,
When the pulling force is large, the engaged state is released and the second cylindrical member 5 moves with respect to the first cylindrical member 4, and the movement of the second cylindrical member 5 is reliably performed at the first step portion 5a. The contact can be prevented. Therefore, the second cylinder member 5 is inserted into the first cylinder member 4 as described above, and the tip of the second cylinder member 5 comes into contact with the projection 4E formed on the inner surface of the first cylinder member 4 so that the second cylinder member 5 The setting of the member 5 is completed. At this time, the ring member 7 is engaged with the second step portion 5b so that the position can be maintained unless a large pulling force acts on the second cylindrical member 5.

[0015] As shown in FIG.
The shape of the outer surface on the side pressed against the inner surface of the first cylindrical member 4 has a shape having two arcs 6A and 6B, so that two press-contact portions against the inner surface of the first cylindrical member 4 can be secured. Thus, the sealing function can be more reliably exerted as compared with the case where one press contact portion is provided.

Although the ring member 7 is not shown,
As shown in FIG. 4, it is formed in a C-shape, and is formed in a trapezoidal cross section so that the inner surface is provided with an inclined guide surface 7B which is located closer to the end of the cylindrical member insertion side. I have. Therefore, when the second cylindrical member 5 is inserted into the first cylindrical member 4, the ring member 7 is smoothly inserted into the first cylindrical member 4 by the guiding action of the tapered insertion distal end 5A and the inclined guide surface 7B. It is possible to move over, and it is possible to reduce the insertion operation force at the time of inserting the second cylindrical member 5 requiring the most operation force. The ring member 7 may be formed in an annular shape.

The case where the underground pipe 2 is connected to the handhole 1 via the joint 3 for connection will be briefly described. First, the epoxy putty P with the first cylindrical member 4 passed through the through hole 1A. To fix. Next, the second tubular member 5 is screwed into the underground pipe 2 while being rotated, and as shown in FIG. 1, the underground pipe 2 is inserted into the vertical wall 5D formed by forming the groove 5B. So that the tip of the abutment contacts. In this state, the second tubular member 5 is inserted into the first tubular member 4 provided with the seal member 6 and the ring member 7, and the connection is completed in the state shown in FIG.

Although the first cylindrical member 4 is provided with the seal member 6 and the ring member 7, it may be provided on the inner surface of the second cylindrical member 5. In this case, a configuration is adopted in which the second cylindrical member 5 is externally fitted to the first cylindrical member 4.

[0019]

According to the first aspect, since the two can be connected only by inserting the other cylindrical member into the one cylindrical member, the connecting portion can be compared with the conventional screwing method. Not only can the underground pipes be connected easily and quickly, but also water does not enter the inside loosely, and can be used well over a long period of time.
Moreover, after the two are connected, it is possible to reliably prevent the two from being disengaged by the contact action of the contact portion. In addition, when inserting the tubular member, the tubular member can be inserted with a small operation force by using the inclined guide surface, and the operability can be improved.

According to the second aspect of the present invention, the simple remodeling in which only the unevenness is formed on the outer surface of the first cylindrical member, and the inward movement of the first cylindrical member to the inside of the connecting portion is ensured by utilizing the unevenness. The first cylindrical member can be used for a long time in a good state without detachment of the first cylindrical member.

According to the third aspect of the present invention, the provision of the accommodating portion allows the second cylinder member to be moved relative to the first cylinder member even when a pulling force or a pushing force acts on the second cylinder member due to uneven settlement or an earthquake. The force can be absorbed by the sliding of the member, and the connecting portion of the tubular member is not damaged.

According to the fourth aspect, it is possible to fix the underground pipe to the second tubular member only by screwing the underground pipe into the second tubular member, and to complete the sealing process. For example, when screwing an underground pipe into which a seal member is externally fitted into a second cylindrical member, it is difficult to fit the seal member externally, and the operator can change the position where the underground pipe is completely screwed into the second cylindrical member by an operator. Can be reliably avoided. Moreover, when the underground pipe is screwed into the second tubular member, the fixing force and the sealing force increase at the tip of the underground pipe, so that the sealing performance can be increased stepwise to improve the sealing performance. There are advantages that can be done.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a state where an underground pipe is connected to a handhole via a connection joint.

FIG. 2 is a sectional view of a main part showing a connecting portion between a first cylindrical member and a second cylindrical member.

FIG. 3 is an exploded perspective view showing a first tubular member and a second tubular member.

FIG. 4 is a cross-sectional view of a main part showing a state where a second tubular member is inserted into the first tubular member.

FIG. 5 is a conventional exploded perspective view showing a state in which an underground pipe is connected to a handhole via a connection joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hand hole (connection part) 1A Through-hole 2 Underground pipe 3 Joint 4 First cylinder member 4A Flange 4B, 4C Projection 4D Unevenness 4E Projection 4T Tube 4a First peripheral groove 4b Second peripheral groove 5 Second cylindrical member 5A Inserting tip 5B Groove 5C Convex 5D Vertical wall 6 Sealing member 6A, 6B Arc 7 Ring member 7A End surface 7B Inclined guide surface 8 O-ring 8A Recess 20 Inner connector 20A Flange 20B Male screw 20C End 21 Outer connector 21A Flange 21B Female thread 21C Thread 22 Cylindrical member 23 Holder 24 Packing 25 Collar 26 Packing 27 O-ring F Power P Epoxy putty

Claims (4)

[Claims] 1. A connection joint for connecting an underground pipe to a connection part such as a handhole or a manhole, comprising: a first tubular member fixed to the connection part; and a tip of the underground pipe. A second tubular member externally fitted and fixed, wherein the first tubular member and the second tubular member are configured to be able to be fitted and inserted, and both of the first tubular member and the second tubular member are inserted after the insertion. A ring member for preventing contact of the first cylinder member with the second cylinder member or the second cylinder member, and a second cylinder member or a first cylinder inserted into the ring member. A connection joint in which the insertion end portion of the member is tapered toward the tip end, and an inclined guide surface is formed on the inner surface of the ring member so as to be located outward toward the end on the cylinder member insertion side. 2. The method according to claim 1, wherein the first cylindrical member fixed to the connecting portion has a concave / convex portion over a specific range from the vicinity of the outer surface of the connecting portion toward the outer side. Fitting for connection. 3. The connection joint according to claim 1, further comprising a flexible portion for allowing the second cylindrical member to slide within a set range with respect to the first cylindrical member. 4. An underground pipe connected to an underground pipe connecting end of the second cylindrical member is provided with a groove capable of mounting an O-ring, and the underground pipe can be screwed into the second cylindrical member including the O-ring. The joint for connection according to claim 1, wherein the groove is configured to have a smaller diameter toward the first cylindrical member.