JP3681302B2 - Branch pipe mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a branch pipe mounting structure, and more particularly to a mounting structure for connecting a branch pipe to an existing pipe line buried in the ground.
[0002]
[Prior art]
As a method for connecting a new pipe (branch pipe) to an existing pipe (buried pipe) buried in the ground, a method described in JP-A-4-343998 is known. In this method, after a pipe (propulsion steel pipe) having a diameter larger than that of the branch pipe is propelled to a predetermined position reaching the vicinity of the buried pipe toward the branch pipe joint of the buried pipe, the earth and sand in the propulsion steel pipe is discharged. Then, a hole saw is inserted into the propulsion steel pipe and an opening is formed by perforating the peripheral wall of the buried pipe, and then the tip of the branch pipe is inserted and connected to this opening, and finally the propulsion steel pipe is pulled out and connected to the branch pipe The earth and sand and mortar are poured and fixed to the outer peripheral part of the.
[0003]
[Problems to be solved by the invention]
However, in the above-described method, when an external force such as vibration at the time of mortar injection is applied to the branch pipe, the axis of the opening and the axis of the branch pipe are likely to be misaligned, and sufficient adhesion between the buried pipe and the branch pipe is obtained. There was a risk of being lost.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a branch pipe mounting structure that can securely attach a tip of a branch pipe to a predetermined position of an opening of a buried pipe and obtain sufficient adhesion.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the branch pipe attachment structure of the present invention is a structure for attaching a branch pipe to an opening of a buried pipe drilled through a propulsion steel pipe reaching the vicinity of the buried pipe. A cylindrical shape in which the outer diameter of the distal end is formed to be slightly smaller than the opening, a connection socket having a flange is attached to the outer periphery of the middle portion in the length direction, and the outer periphery of the connection socket has a male screw on the outer peripheral surface. A saddle member having a saddle portion bonded to the outer surface of the buried pipe is loosely fitted at the tip of the portion, and a flange having a diameter smaller than that of the flange is formed on the inner periphery of the cylindrical body having a diameter larger than that of the connection socket and having an internal thread on the inner peripheral surface. A female screw member provided with a portion is screwed onto a male screw of the cylindrical portion, and the flange is held in a movable state between a flange portion of the female screw member and a base portion of the cylindrical portion of the saddle member. It is characterized by.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show one embodiment of the branch pipe mounting structure of the present invention. FIG. 1 is a sectional view, and FIG. 2 is an exploded perspective view. 3 to 6 are cross-sectional views for explaining the procedure for attaching the branch pipe. FIG. 3 is a stage where the propelling steel pipe is propelled and then the earth and sand at the branch pipe attaching portion is removed, and FIG. FIG. 5 shows a stage in which the peripheral wall of the buried pipe is drilled, FIG. 5 shows a stage in which a connecting socket at the tip of the branch pipe is inserted into the bored opening, and FIG. 6 shows a stage in which the saddle portion is brought into contact with the outer surface of the buried pipe. . Further, FIG. 7 is a cross-sectional view showing a state where the branch pipe is eccentrically attached.
[0007]
First, as shown in FIGS. 1 and 2, the branch pipe 11 is attached to the buried pipe 10 by connecting the opening 12 drilled at a predetermined position on the peripheral wall of the buried pipe 10 at the tip of the branch pipe 11. This is done by inserting the tip of the socket 13 for use. The connection socket 13 includes a receiving port 14 into which the tip of the branch pipe 11 is inserted, and an insertion pipe portion 15 having an inner diameter that is the same as the inner diameter of the branch pipe 11 and whose outer diameter is slightly smaller than the inner diameter of the opening 12. And a flange 16 provided on the outer periphery of the intermediate portion in the length direction.
[0008]
Further, a saddle member 17 for attaching the branch pipe 11 in a stable state is loosely fitted on the distal end side of the connection socket 13 and is held by a female screw member 18. The saddle member 17 has a cylindrical portion 20 having a larger diameter than the insertion tube portion 15 and having an external thread 19 on the outer peripheral surface, a saddle portion 21 formed of a circular curved plate provided at the tip of the cylindrical portion 20, and a cylinder. And a ring-shaped flange portion 22 provided on the inner periphery of the base portion of the shape portion 20.
[0009]
The female screw member 18 is provided with a flange 25 having a diameter smaller than that of the flange 16 on the inner periphery of a base body 24 having a diameter larger than that of the connection socket 13 and having an internal thread 23 on the inner peripheral surface. 13 is inserted into the cylindrical portion 20 of the saddle member 17, and the receiving port 14 of the connecting socket 13 is inserted into the flange 25 of the female screw member 18, and the female screw 23 of the female screw member 18 is inserted into the saddle. By screwing on the male screw 19 of the member 17, the flange 16 of the connecting socket 13 is sandwiched between the flange portion 22 of the cylindrical portion 20 and the flange portion 25 of the female screw member 18. By adjusting, the movement amount of the flange 16 can be regulated appropriately.
[0010]
As a result, the connection socket 13 and the saddle member 17 are assembled in a state in which they can tilt in any direction.
[0011]
In addition, when attaching the branch pipe 11 to the buried pipe 10, it is performed in a state in which the adhesive 26 is placed over the outer circumference of the distal end of the insertion pipe portion 15 and the distal end surface of the saddle portion 21.
[0012]
Next, a procedure for attaching the branch pipe 11 to the buried pipe 10 using the above-described attachment structure will be described. First, as shown in FIG. 3, the propulsion steel pipe 31 having a larger diameter than the branch pipe 11 is propelled to the vicinity of the buried pipe 10, and the earth and sand in the propulsion steel pipe 31 and around the buried pipe 10 are discharged. Then, cement milk 32 is filled between the peripheral edge of the tip of the propulsion steel pipe 31 and the outer periphery of the buried pipe 10.
[0013]
Next, as shown in FIG. 4, the hole saw 33 is inserted through the propulsion steel pipe 31, and the peripheral wall of the buried pipe 10 is drilled with a diameter slightly larger than the outer diameter of the insertion pipe portion 15 to form the opening 12. At this time, the core 34 extracted by the horusoe 33 is extracted together with the horusoe 33.
[0014]
Then, as shown in FIG. 5, the connection socket 13, the saddle member 17 and the female screw member 18 are assembled in a predetermined state at the tip of the branch pipe 11 to be connected, and the adhesive 26 is further mounted in a predetermined position. Then, the branch pipe 11 is inserted into the propulsion steel pipe 31. At this time, the distal end of the insertion tube portion 15 is preferably processed into a curved shape corresponding to the inner peripheral side shape of the extracted core 34.
[0015]
When the branch pipe 11 is further inserted from the state of FIG. 5, as shown in FIG. 6, the distal end portion of the insertion tube portion 15 is inserted into the opening 12 of the embedded tube 10, and the distal end surface of the saddle portion 21 is embedded. It will be in the state contact | abutted to the outer peripheral surface of the pipe | tube 10. As shown in FIG. Thereby, the outer periphery of the distal end of the insertion tube portion 15 of the connection socket 13 is fixed in the opening 12 via the adhesive 26, and the saddle portion 21 of the saddle member 17 is attached to the outer peripheral surface of the embedded tube 10 via the adhesive 26. It becomes a fixed state. When the adhesive 26 is sufficiently solidified, the cement milk is filled between the inner peripheral surface of the propulsion steel pipe 31 and the outer peripheral surface of the branch pipe 11, thereby completing the operation of attaching the branch pipe 11 to the buried pipe 10. To do.
[0016]
Further, as shown in FIG. 7, even if the opening 12 is formed at a position eccentric with respect to the center of the buried pipe 10 due to a displacement or inclination of the propulsion steel pipe, The tip of the insertion tube portion 15 is machined in accordance with the shape, and the amount of tilting of the saddle member 17 with respect to the connection socket 13 is set to a predetermined amount by appropriately setting the screwing amount of the male screw 19 and the female screw 23. Thus, the branch pipe 11 can be attached to the buried pipe 10 in a predetermined joined state.
[0017]
Note that it is desirable to use an epoxy adhesive for the adhesive 26 in consideration of curing time and the like. Moreover, what is necessary is just to fix between the receptacle 14 of the socket 13 for connection, and the front-end | tip of the branch pipe 11 using an adhesive etc. similarly to the connection of normal piping.
[0018]
【The invention's effect】
As described above, according to the branch pipe attachment structure of the present invention, the branch pipe tip can be reliably attached to a predetermined position of the opening formed in the buried pipe.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embedded pipe showing an embodiment of a branch pipe mounting structure according to the present invention as viewed from the axial direction.
FIG. 2 is an exploded perspective view.
FIG. 3 is a cross-sectional view showing a stage in which the propelling steel pipe is propelled and the earth and sand at the branch pipe attaching portion is removed.
FIG. 4 is a cross-sectional view showing a stage in which a peripheral wall of an embedded pipe is drilled.
FIG. 5 is a cross-sectional view showing a step of inserting a connecting socket at the tip of a branch pipe into a perforated opening.
FIG. 6 is a cross-sectional view showing a stage in which a saddle part is brought into contact with an outer surface of an embedded pipe.
FIG. 7 is a cross-sectional view showing a state where a branch pipe is attached eccentrically.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Embedded pipe, 11 ... Branch pipe, 12 ... Opening, 13 ... Connection socket, 14 ... Receptor, 15 ... Insertion pipe part, 16 ... Flange, 17 ... Saddle member, 18 ... Female screw member, 19 ... Male screw, 20 ... cylindrical part, 21 ... saddle part, 22 ... collar part, 23 ... female screw, 24 ... cylindrical body, 25 ... collar part, 26 ... adhesive, 31 ... propulsion steel pipe, 32 ... cement milk, 33 ... Horso, 34 ... core

Claims (1)

In the structure for attaching the branch pipe to the opening of the buried pipe drilled through the propulsion steel pipe reaching to the vicinity of the buried pipe, the outer diameter of the tip portion is formed slightly smaller than the opening at the distal end of the branch pipe. A saddle member having a saddle portion that is attached to the outer surface of a buried pipe at the distal end portion of a cylindrical portion having a male screw on the outer peripheral surface at the distal end portion of the connecting socket, with a connecting socket having a flange on the outer periphery of the intermediate portion in the vertical direction A female screw member provided with a flange having a diameter smaller than that of the flange on the inner periphery of the cylindrical body having a diameter larger than that of the connection socket and having an internal thread on the inner peripheral surface is screwed onto the male thread of the cylindrical portion. A mounting structure for a branch pipe, wherein the flange is held in a movable state between a flange portion of the female screw member and a base portion of a cylindrical portion of the saddle member.

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