JP4318090B2 - How to connect pipes in hand holes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a handhole provided for laying a power cable, a communication cable, an optical fiber cable, or the like, or a socket that is fixed to the side wall of a manhole, a water tank, or the like (hereinafter collectively referred to as “handhole etc.”). The present invention relates to a pipe connection method in a hand hole or the like for connecting a pipe such as a protective pipe for housing the cable to a member .
[0002]
[Prior art]
For example, cables such as power cables, communication cables, and optical fiber cables that are laid in the ground are buried at the required distance by digging down key points on the surface of the ground and burying inspection hand holes made of resin concrete. A pipe such as a protective tube for housing the cable is connected to the side walls of the hand holes through a socket member .
[0003]
That is, as shown in FIG. 2, the socket member 21 has an inner diameter substantially equal to the outer diameter of the pipe to be inserted from the opening 22 at one end corresponding to the insertion side of the pipe 29 toward the opening 23 at the other end. Packing holding for holding a packing formed of a rubber ring inside the vicinity of the opening 22 corresponding to the insertion side of the pipe receiving part 24 by forming a straight pipe part with a predetermined length. The portion 25 is formed to bulge outward, and a reduced diameter portion 26 having a predetermined length is formed by a gradual reduction from the inner back of the tube receiving portion 24 toward the opening 23 at the other end. After that, a trumpet-shaped guide portion 27 having a gradually enlarged diameter is formed.
[0004]
The diameter-reduced portion 26 and the guide portion 27 of the socket member 21 mainly penetrate the side wall on the connection side of the hand hole 28 or the like so that the opening 23 at the other end is flush with the inner surface of the side wall. Therefore, a sanding portion is formed on the outer peripheral surface of this portion so that the connection with the side wall is tight.
[0005]
An end of a pipe 29 that is connected to the opening 22 is inserted into the socket member 21 that passes through the side wall of the hand hole 28 and the like, and the pipe end of the pipe 29 is connected to the pipe receiving portion 25. The inserted pipe 29 is hermetically sealed by a ring-shaped packing 30 provided in a packing holding portion 25 formed in the vicinity of the opening 22 of the socket member 21. Held in a state.
[0006]
Pipe 29 to be connected to the socket member 21, even if the insertion depth of that is too deep in the tube receiving portion within 24, also because it is too shallow mounting undesirably becomes unstable, inserted pipe 29 Various methods have been conventionally used to confirm the position of the end portion.
[0007]
One of them is that an operator enters a hand hole 28 or the like , inserts a measure or a backing plate into the opening 23, and positions the end of the pipe 29 inserted by the outside worker with this measure or the backing plate. It is a method of holding in a predetermined position while measuring.
Other one of the socket member 21, and the marker at a predetermined position on the inner surface of the tube receiving portion 24, with a mark with such marking, the operator who has entered the hand hole or the like 28 while observing the marked line In this method, the position of the end of the pipe 29 inserted by the outside worker is determined.
Further, in some cases, the marked line is provided on the outer surface of the tube receiving portion 24, and the insertion depth is determined by approximate registration.
[0008]
[Problems to be solved by the invention]
The determination of the insertion depth of the pipe 29 to be connected is difficult to determine because the inside of the socket member 21 is dark, and it takes time for positioning. Uncertain.
In addition, since the marked line is attached to the outer surface of the tube receiving portion 24, the position of the marked line on the outer surface is memorized and the position of the inner surface is imagined for positioning. It's out of the question.
[0009]
Even though these connection methods are possible when the socket member is relatively short, it is not effective for a long socket member and causes a significant reduction in work efficiency. Therefore, easier positioning is desired. It was a thing.
[0010]
In view of the present situation, the present invention can easily and easily set a pipe end of a pipe to be connected to a required portion of a socket member integrally provided on a side wall of a hand hole or the like. It is intended to provide a method for connecting pipes .
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a pipe connection method in a handhole or the like according to the present invention includes:
When connecting a pipe to a socket member that is fixed to the side wall such as a hand hole,
Ring-shaped, which is shaded by incident light from the opening on the inner wall side, for positioning the end of the pipe that is the connection pipe on the inner peripheral surface of the straight tubular tube receiving part having an opening on the outer wall side of the side wall Using a socket member with a concave groove of
The end of the pipe inserted into the socket member from the opening on the outer wall side is positioned by visual observation from the opening on the inner wall side using the ring-shaped concave groove. is there.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In the pipe connection method in the hand hole or the like according to the present invention, the socket member to be used is preferably obtained by molding a thermoplastic resin such as vinyl chloride resin, polyethylene or polypropylene, particularly by blow molding.
[0012]
In this socket member, a portion having a predetermined length from the opening at one end is a straight pipe portion having an inner diameter substantially equal to the outer diameter of the pipe to be inserted, and a pipe receiving portion for holding the pipe into which the straight pipe portion is inserted. Further, a packing holding portion bulging outward is formed on the peripheral wall of the tube receiving portion in the vicinity of the one end opening.
[0013]
There is no restriction | limiting in particular in size, such as the length of a socket member, and a diameter, It can select suitably according to the objective of the pipe line which should be formed.
[0014]
This socket member is provided with a concave groove as an index for positioning the pipe end portion of the pipe to be inserted on the inner peripheral surface at a predetermined position in the length direction from the one end opening portion of the set pipe receiving portion. It is.
In addition, this ditch | groove is formed in the ring shape in the required inner surface of a pipe receiving part so that visual observation is easy.
At this time, the socket member can be easily obtained by using the bulged portion obtained by bulging the inner and outer surfaces of the tube receiving portion outward by blow molding as a marked line.
[0015]
The socket member is used, for example, when protecting the plurality of cables such as a protective tube (pipe) through fixed to the side wall, such as a hand hole, it can be used as a bell mouth socketed.
In addition, a bell block formed by joining a plurality of sockets with bell mouths with resin concrete or the like can be fixed to the side wall of the hand hole to form a pipe line with a plurality of cables. It functions favorably for attaching a protective pipe (pipe) to a socket with a socket.
[0016]
[Action]
Socket member used in the pipe connecting method in a hand hole or the like of the present invention, the opening at one end which is secured through the side wall, such as hand hole, insert the pipe to do the attachment, the tube end of the inserted pipe tube It holds so that it may be located in the part of the said ring-shaped concave groove formed in the receiving part.
At that time, when an operator enters the inside of the hand hole or the like, and the inside of the socket member is viewed from the opening at the other end, the light entering from the opening hits the ring-shaped concave groove formed, and the portion is shaded. Therefore, the position can be easily confirmed.
By keeping the pipe end of the pipe to be inserted in this position in the position of the ring-shaped concave groove, the insertion depth of the pipe can be determined in a short period of time, thereby stabilizing the pipe in the socket member. Can be installed.
Such a groove setting is particularly advantageous for mounting a tube on a long socket member.
[0017]
【Example】
Hereinafter, an embodiment of a pipe connection method in a handhole or the like according to the present invention will be described more specifically with reference to the accompanying drawings.
FIG. 1 is a partially cutaway sectional view showing a use state in an example of a socket member used in a pipe connection method in a handhole or the like according to the present invention. The socket member 1 for pipe connection is made of vinyl chloride resin. It was obtained by blow molding.
[0018]
This socket member 1 has a straight pipe portion having an inner diameter substantially equal to the outer diameter of the pipe 12 to be inserted, having a predetermined length, from one opening portion 2 toward the other opening portion 3. And a packing holding part 5 for holding the packing 11 is formed on the inner peripheral surface in the vicinity of the opening 2 of the pipe receiving part 4 so as to bulge outward. A diameter-reduced portion 6 having a predetermined length is formed by a gradual reduction from the inner back to the opening 3 side at the other end, and the other opening edge is gradually expanded to form a trumpet-shaped guide portion 7. It is what.
[0019]
A roughened sanding portion 8 is formed on the outer peripheral surface of the reduced diameter portion 6 and the guide portion 7 of the socket member 1, and is slightly inward from the center in the longitudinal direction of the tube receiving portion 4. In the portion, the inner and outer surfaces of the tube receiving portion 4 are bulged outwardly to provide a ring-shaped concave groove 9.
[0020]
The ring-shaped concave groove 9 can be formed simultaneously with the deformed portions such as the packing holding portion 5, the reduced diameter portion 6 and the guide portion 7 when the socket member 1 is blow-molded.
[0021]
This socket member 1 passes through the side wall of a hand hole or the like 10 made of resin concrete, and is fixed so that the opening 3 at the other end is flush with the inner surface of the side wall.
At this time, the sanding portion 8 formed on the outer peripheral surfaces of the reduced diameter portion 6 and the guide portion 7 is well adapted to the resin concrete on the side wall, and the fixing portion can be kept airtight.
[0022]
From the opening 2 of the socket member 1 fixed through the side wall of the handhole 10 or the like, the end of the pipe 12 to be connected is inserted, and the tube end is formed in the tube receiving portion 4. Further, the ring-shaped concave groove 9 is held so as to be positioned.
In this case, when one worker enters the inside of the hand hole 10 or the like and the inside of the socket member 1 is viewed from the opening 3 at the other fixed end, the inner and outer surfaces are formed by bulging outward. Since the light beam from the opening 3 hits the ring-shaped concave groove 9 and a shadow is generated in the ring-shaped concave groove 9 portion, the position can be easily confirmed.
Therefore, the insertion depth of the pipe 12 from the outside according to the position can be matched with the ring-shaped concave groove 9 in a short time without hesitation, whereby the pipe 12 can be held at a predetermined position. Is.
[0023]
The pipe 12 is held in an airtight state by a ring-shaped packing 11 that is present in a packing holding portion 5 formed in the vicinity of the opening 2 of the socket member 1 during insertion.
[0024]
Thus, through the socket member 1, a pipe 12 attached to the hand hole or the like 10 is connected to other similar hand hole, not shown, the power cables for the purpose from the opening 3 side of the hand hole or the like 10, Cables such as communication cables and optical fiber cables can be inserted and pulled out from the other handholes, and these can be carried out sequentially to lay the cables.
[0025]
【The invention's effect】
A pipe connection method in a hand hole or the like according to the present invention includes a ring-shaped recess for positioning an end of a pipe to be inserted on an inner peripheral surface at a predetermined position in the length direction of a set tube receiving portion. This is performed using a socket member provided with a groove. After fixing the socket member through a side wall such as a hand hole, a ring-shaped member is inserted when inserting a pipe to be attached from one end opening. By applying a light beam to the concave groove from the opening at the other end, it is possible to cause a shadow on the part, so that the position can be confirmed very easily from the inside of the hand hole or the like .
Therefore, the pipe insertion depth can be determined in a short time by keeping the end of the pipe to be inserted in this ring-shaped concave groove, and the pipe connected to the socket member can be stabilized. It can be attached to the work and the work efficiency can be greatly improved.
[0026]
At that time, the socket member for pipe connection used in the present invention can be easily and easily formed into a ring shape by blow molding when forming a ring-shaped concave groove inside the tube receiving portion. The ring-shaped concave groove has an excellent feature in that the formation of the ring-shaped concave groove can be very easily performed, and the setting of the ring-shaped concave groove functions particularly advantageously for connecting the pipe to the long socket member. .
[Brief description of the drawings]
FIG. 1 is a partially cutaway sectional view showing a usage state of an example of a socket member used in a pipe connection method in a handhole or the like according to the present invention.
FIG. 2 is a longitudinal sectional view showing a use state of a conventional socket member for pipe connection .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Socket member for pipe connection 2,3 Opening part 4 Pipe receiving part 5 Packing holding part 6 Reduced diameter part 7 Guide part 8 Sanding process part 9 Groove 10 Hand hole etc. 11 Packing 12 Pipe

Claims (1)

When connecting a pipe to a socket member that is fixed to the side wall such as a hand hole,
Ring-shaped, which is shaded by incident light from the opening on the inner wall side, for positioning the end of the pipe that is the connection pipe on the inner peripheral surface of the straight tubular tube receiving part having an opening on the outer wall side of the side wall Using a socket member with a concave groove of
End positioning of the pipe inserted into the socket member from the opening on the outer wall side is performed by visual observation from the opening on the inner wall side using the ring-shaped concave groove.
A pipe connection method in a hand hole or the like characterized by

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