JP3827103B2 - Branch saddle fitting - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a branch take-out joint for taking out and piping a resin branch pipe from a steel main pipe.
[0002]
[Prior art]
Conventionally, many external resin-coated steel pipes have been used as gas pipes buried in the ground. However, in recent years, polyethylene resin pipes have been used in consideration of earthquake resistance and corrosion resistance.
Therefore, for example, there is a joint shown in FIG. 5 disclosed in Japanese Utility Model Publication No. 62-40232 for connecting this type of steel main pipe and a steel branch pipe. This is a saddle joint in which the half saddles 1 and 2 can be separated and connected and are connected to the outer surface of the steel pipe 5 with bolts 3 and nuts 4.
Various joints, for example, disclosed in JP-A-8-61582 have been developed and disclosed as joints for branching out a resin branch pipe from a resin main pipe.
[0003]
[Problems to be solved by the invention]
However, when branching out a resin branch pipe from a steel main pipe, for example, one side is connected to the connection port of a steel pipe branch joint to connect the branch connection port of the steel pipe branch joint and the resin branch pipe. A joint having a connecting portion for connecting to the resin branch pipe on the other side is required, and the branch joint for steel pipe and the resin branch pipe have to be connected by piping through this joint. In this case, there are problems of sealability and seismic resistance due to an increase in the number of connecting portions, and workability problems such as requiring a large excavation area.
Further, in the case shown in FIG. 5 in which the upper and lower half saddles can be separated and connected, if the bolt and nut tightening portion is loosened, it is easy to separate at the connecting portion of the upper and lower half saddles. For this reason, there are problems such as troublesome fixed connection work to the steel pipe.
[0004]
The branch extraction pipe is made of resin such as polyethylene and has corrosion resistance in a buried environment in the soil. However, if the branch joint is made of steel, the resin pipe is inferior in corrosion resistance and takes into account the corrosion resistance. However, there is a problem that unbalance with the branch joint occurs even if the branch take-out pipe is used.
The present invention solves the above-mentioned problems, solves the problems of sealability and earthquake resistance when installing and branching a resin branch pipe from a steel main pipe, and solves the mounting workability on the steel pipe, and the upper and lower saddles The present invention provides a branch saddle joint that can be firmly clamped and fixed to a steel pipe with an equal force and that takes into account the balance between the resin branch pipe and the corrosion resistance.
[0005]
[Means for Solving the Problems]
The gist of the present invention is that a metal saddle divided into upper and lower parts is sandwiched and fixed on the outer peripheral surface of a steel pipe, and a branch pipe is branched out from a branch connection port provided in one saddle. An engaging protrusion is provided on the upper part, and at least the outer surface of the upper and lower saddles is covered with a resin coating layer, and a main pipe for inserting a perforation cutter for making a through hole in the outer surface of the steel pipe is provided at the central part of the upper saddle. , said internal thread is provided on the main pipe ends, the branch port of the upper saddle protrudes in a direction orthogonal to the main pipe, an annular concave-convex groove provided on the inner peripheral surface of the branch opening, the edge of the concavo-convex groove A resin short tube is mounted via a packing across the inner peripheral surface of the resin coating layer and the inner peripheral surface of the resin coating layer , and a metal cylinder is mounted on the inner peripheral surface of the resin short tube. diametrically enlarged from the inner circumference side of the body uneven groove peripheral surface of the resin short pipe said branch port The upper and lower saddles are fixed to the steel pipe by press-contacting with the packing and connecting the one end side engaging protrusions of the upper and lower saddles with a connecting member so as to be openable and closable. The branch saddle joint is characterized in that a branch resin pipe is connected to the resin short pipe at the branch port and branched out. In the branch joint, the connecting member can be provided at an end of the engaging protrusion, or the connecting member can be provided on both sides of the engaging protrusion.
In addition, a metal saddle divided vertically on the outer peripheral surface of a steel pipe is clamped and fixed, and a branch pipe is taken out from a branch connection port provided in one saddle, and is engaged with both sides of the upper and lower saddles. Protruding pieces are provided, and at least the outer surfaces of the upper and lower saddles are covered with a resin coating layer, and at the central part of the upper saddle, a main pipe for inserting a perforation cutter for making a through hole in the outer surface of the steel pipe is provided, and the main pipe end part of the internal thread provided on the branch port of the upper saddle protrudes in a direction orthogonal to the main pipe, an annular concave-convex groove provided on the inner peripheral surface of the branch opening, and the inner peripheral surface of an end portion of the concavo-convex groove A resin short tube is attached via a packing across the inner peripheral surface of the resin coating layer , a metal cylinder is attached to the inner peripheral surface of the resin short tube, increased diameter from the peripheral side and the resin short pipe uneven groove peripheral surface of the branch port with packings The upper and lower saddles are fixed to the steel pipe by clamping at least the other end side engagement protrusions of the upper and lower saddles, and the branch resin pipe is connected to the resin short pipe of the branch port. The branch saddle joints may be taken out by branching, and in these branch joints, the resin pipe for branching is closed by compressing the outer surface of the resin pipe with a jig as necessary. It is possible to operate.
[0006]
[Action]
The present invention is configured as described above, and the upper and lower saddles are connected to each other by a connecting member so as to be freely opened and closed on one side of the original steel pipe. Can be connected with steel pipe. In addition, the upper and lower saddles are not separated before construction or in a state where the bolts are loosened, and the workability is good.
In addition, the outer surface of the joint is coated with resin, providing a balance of corrosion resistance with the resin branch pipe, and because the resin pipe connection part by the resin short pipe is provided at the branch port, it can be easily connected to the resin branch pipe Piping can be performed, and safe branch extraction piping can be performed. In addition, the conventional joint that connects the metal branch joint and the resin pipe is not required, and the number of joints is small, so the sealing performance and seismic resistance are improved. .
[0007]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a partial front sectional view showing an embodiment of the present invention, and FIG. 2 is a side view showing a cross section of the connecting portion in FIG. In the figure, reference numeral 10 denotes an outer surface resin-coated steel pipe which is buried in soil, and a lower saddle 20 and an upper saddle 30 are sandwiched and fixed to the lower surface of the outer surface resin-coated steel pipe 10. The upper and lower saddles 20, 30 have engaging protrusions 21, 22, 31, 32 protruding on both sides of the steel pipe 10, and the connecting shaft 11 is fixed by a connecting pin 13 on one end 31 side of the engaging protrusion of the upper saddle. The shaft 11 is connected to the engaging protrusion 21 side of the lower saddle and the connecting pin 12 to connect the one end side of the upper and lower saddles so as to be freely opened and closed. For this reason, the engagement protrusions 22 and 32 on the other end side of the upper and lower saddles can be freely opened and closed. On the other end side engagement protrusions 22, 32 side, a female screw 23 is provided on the lower saddle side, the bolt 14 is screwed from the bolt through hole 33 on the upper saddle side, and the nut 15 is tightened to move up and down around the steel pipe 10. The saddles 20 and 30 are clamped and fixed. Note that a bolt with a nut in which a nut 15 is fixed to the bolt 14 with a pin may be used, or a normal hexagon bolt may be used.
[0008]
The upper and lower saddles 20 and 30 are made of malleable cast iron that can be firmly fixed to the steel pipe 10, and vinyl chloride resins 24 and 34 are coated by injection molding on the entire inner and outer surfaces. Also the bolt 14, after fastening the nut 15, a resin cap 16 is screwed attached to the upper end external thread of the bolt 14, a packing 17 between the resin coating layer 34 and the cap 16 the lower surface of the upper saddle and clamped Corrosion protection is fulfilled.
An O-ring groove 35 is provided on the inner surface of the upper saddle 30 along the outer peripheral surface of the steel pipe 10, and an O-ring packing 50 is attached to hermetically seal with the surface of the steel pipe 10. At the center of the upper saddle, there is provided a main pipe 36 for inserting a perforation cutter for drilling the through hole 18 on the outer surface of the steel pipe, and an internal thread 37 is provided at the end of the main pipe 36 for attaching a drilling machine or after construction. The main pipe 36 can be closed by screwing the plug. A resin sleeve 38 is provided at the upper end of the main pipe 36, and the outer peripheral surface of the plug that is screwed into the female screw 37 to close the main pipe 37 is subjected to anticorrosion treatment with butyl rubber or the like.
[0009]
A branch port 39 communicating with the main tube is provided at the side of the main tube 36. The inner surface of the branch port 39 is formed in an annular concave and convex groove 40, and a resin short tube 41 is attached to the branch port and hermetically fixed. It is. The short pipe 41 made of resin expands the diameter of the metal cylinder 42 attached to the inner surface of the end of the short pipe, presses the outer peripheral surface of the short pipe 41 into the inner annular concave / convex groove 40 of the branch port 39, and the packing 43 It is pressed and sealed.
[0010]
The outer periphery of the branch connection side end of the short pipe 41 is covered with a cap 44, and the surface of the short pipe connection part 41 is prevented from being oxidized or scratched until it is connected to the resin pipe for the branch pipe. Yes. The outer diameter of the connecting portion of the short pipe 41 is the same as the outer diameter of the resin pipe to be branched, and the resin pipes can be easily connected using a socket such as a normal electric fusion joint. Moreover, since the resin short pipe 41 protrudes from the side of the steel pipe 10 and is connected to the branching resin pipe, the outer surface of the resin pipe can be compressed with a jig to close the branch pipe as necessary. Yes, there is no need to pipe or use a separate valve.
The upper and lower saddles 20 and 30 are resin-coated on the entire outer surface except for the inner peripheral surface of the main pipe 36 with vinyl chloride resins 22 and 32, and the joint portions of the upper and lower saddles are formed by stamps 51 and 52 by the resin coatings 22 and 32. The inside of the metal saddle and the steel pipe are protected against corrosion.
[0011]
FIG. 3 is a cross-sectional view of a connecting portion between an upper saddle and a lower saddle showing another embodiment of the present invention. Except for the drawings, the same reference numerals are used to denote the same as in FIG.
In this embodiment, connecting plates 60 and 60 are applied to both side portions of one end side engaging projections 21 and 31 of the upper and lower saddles 20 and 30, and are connected to the engaging projections 21 and 31 by connecting pins 61 and 62, so that the upper and lower saddles One end side is connected so that opening and closing is possible. In this embodiment, since the upper and lower saddle engagement protrusions 21 and 31 are rotatably connected to each other, the degree of close contact with the outer surface of the steel pipe 10 is good, and there is an advantage that it can be strongly connected to the steel pipe.
FIG. 4 shows still another embodiment. A rigid hinge 70 is provided at the end of one end side engaging projections 21 and 31 of the upper and lower saddles 20 and 30, and one end of the upper and lower saddles can be freely opened and closed by pins 71 and 72. It is connected to.
[0012]
【The invention's effect】
As described above, the branch take-out joint according to the present invention can be easily connected to the steel pipe by simply bolting one end of the engaging protrusion protruding from both ends of the upper and lower saddles. Saddle is not separated and workability is good.
In addition, the outer surface of the joint is coated with resin to provide corrosion resistance, and since the resin pipe connection part is provided at the branch port, it can be easily connected to the resin branch pipe, making safe branch extraction piping possible. Improves.
[Brief description of the drawings]
FIG. 1 is a front partial sectional view showing a state in which the steel pipe is mounted according to an embodiment of the present invention.
FIG. 2 is a side view showing a cross section of a connecting portion in FIG. 1;
FIG. 3 is a side view of a connecting portion showing another embodiment of the present invention.
FIG. 4 is a side view of a connecting portion showing still another embodiment of the present invention.
FIG. 5 is a partial cross-sectional view showing a state where the conventional branched saddle is mounted on a steel pipe.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Outer surface resin-coated steel pipe 11 Connection shaft 12, 13 Connection pin 14 Bolt 15 Nut 16 Cap 17 Packing 18 Through hole 20 Lower saddle 21, 22 Engagement protrusion 23 Female thread 24 Vinyl chloride resin layer 30 Upper saddle 31, 32 Engagement protrusion 33 Bolt through hole 34 Vinyl chloride resin layer 35 O-ring groove 36 Main pipe 37 of upper saddle 37 Female thread 38 Sleeve 39 Branch port 40 Annular concave and convex groove 41 Resin short pipe 42 Metal cylinder 43 Packing 50 O-rings 51 and 52 Mating portion 60 Sealing plate 61, 62 Connecting pin 70 Hinge 71, 72 pin

Claims (5)

In a joint that clamps and fixes a metal saddle vertically divided on the outer peripheral surface of a steel pipe and branches and takes out the branch pipe from the branch connection port provided in one saddle,
Engaging protrusions are provided on both sides of the upper and lower saddles, and at least the outer surface of the upper and lower saddles is covered with a resin coating layer, and a punching cutter for making a through hole in the outer surface of the steel pipe is provided at the center of the upper saddle. A main pipe to be inserted is provided, an internal thread is provided at an end of the main pipe, a branch port of the upper saddle projects in a direction orthogonal to the main pipe, and an annular uneven groove is provided on an inner peripheral surface of the branch port , the resin short tube mounted through a packing across the inner circumferential surface of the the inner peripheral surface of an end portion of the concavo-convex grooves resin coating layer, a metal cylindrical body attached to the inner peripheral surface of the resin-made short pipe , and enlarged from the inner peripheral side of the metal tubular body made of resin short tube was sealed and fixed pressed against the uneven groove inner peripheral surface and the packing of the branch port, the one end portion side engaging projection piece of the upper and lower saddle Are connected to the steel pipe by clamping the other end side engaging projection piece with a bolt. Branch saddle joint, characterized in that the branch is taken out by connecting a branching resin pipe resin short pipe branch opening.   The branch saddle joint according to claim 1, wherein the connecting member is provided at an end of the engaging protrusion.   The branch saddle joint according to claim 1, wherein the connecting member is provided on both sides of the engaging protrusion. In a joint that clamps and fixes a metal saddle vertically divided on the outer peripheral surface of a steel pipe and branches and takes out the branch pipe from the branch connection port provided in one saddle,
Engaging protrusions are provided on both sides of the upper and lower saddles, and at least the outer surface of the upper and lower saddles is covered with a resin coating layer, and a punching cutter for making a through hole in the outer surface of the steel pipe is provided at the center of the upper saddle. A main pipe to be inserted is provided, an internal thread is provided at an end of the main pipe, a branch port of the upper saddle projects in a direction orthogonal to the main pipe, and an annular uneven groove is provided on an inner peripheral surface of the branch port , via a packing to across the inner circumferential surface of the the inner peripheral surface of an end portion of the concavo-convex grooves resin coating layer wears the resin short pipe, install a metal tubular body on the inner peripheral surface of the resin-made short pipe and, diametrically enlarged from the inner peripheral side of the metallic tubular body sealed to secure the plastic short pipes pressed against the uneven groove inner peripheral surface and the packing of the branch opening, at least the other end engaging the upper and lower saddle The mating piece is clamped with a bolt and fixed to the steel pipe, and the branch resin pipe is connected to the resin short pipe at the branch port. Branch saddle joint, characterized in that the branch is taken out by connecting.   5. The branching resin pipe according to claim 1, wherein the branching pipe line can be closed by compressing an outer surface of the resin pipe with a jig as necessary. Branch joint.

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