JP3258419B2 - Branch pipe mounting method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for mounting a branch pipe having excellent earthquake resistance, which is mounted on a branch port formed in a large-diameter fluid pipe such as a water pipe.

[0002]

2. Description of the Related Art A branch pipe 01 of this type is conventionally known, which comprises a hollow cylindrical pipe main body 02 having a lower end portion formed in a large diameter portion 03 as shown in FIG. is there. 04 is a rubber ring fitted and mounted on the outer circumference of the pipe body 02, 05 is a washer,
Reference numeral 06 denotes a tightening nut screwed and attached to a male screw 07 formed at the upper end of the tube main body 02. The large-diameter portion 03 is a large-diameter annular flange portion 08, and the flange portion 08 is a stepped portion 09.
And a lower end via a tapered portion 010. Reference numeral 011 denotes an annular projection formed at the lower end of the rubber ring 04. Reference numeral 012 denotes a branch port formed by drilling a fluid pipe 013. It is inserted and pressed.

[0003]

The conventional branch pipe 01 and the apparatus to which the pipe is attached have the following various problems. (1) Since the outer diameter of the flange portion 08 of the pipe main body 02 is smaller than that of the branch port 012, when the pull-out force acts on the branch pipe 01, the rubber ring
No retaining effect beyond the shear force of 04 can be expected. This is the same as in the case where a coil spring is annularly embedded in the rubber ring 04 because the spring escapes toward the inner surface of the tube. (2) Since a circular hole is formed in the fluid pipe 013 as the branch port 012, the hole edge on the inner surface of the pipe is not a circle on a horizontal plane, but a circle formed on a curved surface. There is a difference in height with the peripheral part. Since the tapered portion 010 and the flange portion 08 of the pipe main body 02 are circles on a horizontal plane, even if the rubber ring 04 is pressed against the branch port 012, the compressed state becomes uneven, and there is a concern about fluid sealing. In particular, there is a problem near the hole edge in the pipe axis direction. (3) Since the rubber ring 04 is sandwiched between the tightening nut 06, the tapered portion 010, and the flange portion 08 via the washer 05, the washer 05 and the outer surface of the tube are in contact with each other, so that it is difficult to bend against a lateral force. (4) If the ground fluctuates due to an earthquake or the like and a large lateral force is applied to the branch pipe 01 and tilts, the non-uniformity of the compression ratio in (2) further increases, and the press-in force on one side cannot be maintained. Since the rubber ring 04 is sandwiched between the flange portion 08, the tapered portion 010, and the washer 05, the rubber ring 04 may be damaged if the stopper moves. (5) Chips come out when drilling the fluid tube 013. This chip is located at the top of the tube, and when the tightening nut 06 is tightened in this state, the chip is caught between the washer 05 and the tube 013. There is no problem with the sealing mechanism in this state,
This pinched chip moves due to the vibration of the vehicle, etc., and the washer 05
When falling off from the lower part of the pipe, the branch pipe 01
, The press-fit state of the rubber ring 04 is released, and the sealing effect is greatly reduced. (6) After the branch pipe 01 is attached, if a cleaning bullet is sent with pressurized water or the like to clean the inner surface of the pipe, the cleaning bullet may be caught on the flange portion 08 of the branch pipe 01. (7) Since the rubber ring 04 is sandwiched between the tightening nut 06, the tapered portion 010, and the flange portion 08, the body of the pipe body 02 always receives a tensile load. For this reason, there is also a relationship between the screws on the upper part of the body, and the thickness of the body must be increased. Fluid pipe
Since the inner diameter of the pipe main body 02 is smaller than the diameter of the branch port 012 of 013, the efficiency with respect to the diameter of the perforated hole is deteriorated in consideration of the flow rate and the like.

Accordingly, the present invention solves the above-mentioned conventional problems and can improve the force of preventing a branch pipe formed in a fluid pipe from coming off from a branch port. The unevenness of the compression ratio of the rubber ring due to the difference in the distance can be eliminated, and even if a lateral force is applied, the structure can be softly bent and the sealing function will not be reduced without damaging the rubber ring even if bent. In addition, even if chips are left at the top of the pipe, it does not affect the sealing function.In addition, even if a cleaning bullet is inserted into the inner surface of the pipe, it will not be caught. It is an object of the present invention to provide a method and an apparatus for mounting a branch pipe such that the ratio of the pipes can be reduced.

[0005]

According to a first aspect of the present invention, there is provided a mounting method comprising: a shaft hole having an opening at an upper end and a bottom formed on a tapered surface inclined downward.
A main shaft in which a hook member projecting window is cut out on a peripheral wall facing the tapered surface of the shaft hole, a movable shaft fitted up and down in the shaft hole of the main shaft, and a pin at a lower end of the movable shaft. And a hook member which is pivotally supported so as to be tiltable at a predetermined angle with respect to the axis, slides on a tapered surface of the main shaft by downward movement of the movable shaft, and tilts to project a molding surface outward from a window. A thin-walled branch pipe having a flange portion is fitted and supported on the outer peripheral surface of a lower end portion of the main shaft of the diameter increasing jig, and a flange portion is formed on an outer peripheral surface of an upper end portion. After the rubber ring having the protruding portion is fitted and supported on the outer peripheral surface of the lower end of the branch pipe, the expanding jig supporting the branch pipe and the rubber ring is connected to the branch port formed by drilling the fluid pipe from the lower end side. Press in and press in, the flange of the rubber ring contacts the outer peripheral surface of the fluid pipe,
After the flange of the branch pipe abuts against the flange of the rubber ring, the abutment of the two flanges causes the movable shaft to move downward with respect to the main shaft protruding downward from the lower end of the branch pipe to tilt the hook member. To make the forming surface protrude outward from the window, and then rotate the main shaft and move the main shaft up and down little by little to press the lower end of the branch pipe with the forming surface of the hook member, and from the inside The diameter is increased in a trumpet shape toward the outside, and the outer diameter is formed into an enlarged diameter portion larger than the diameter of the branch port.

According to a second aspect of the present invention, there is provided a mounting device having a shaft hole having an upper end opened and a bottom formed on a tapered surface inclined downward, and a hook member protruding from a peripheral wall facing the tapered surface of the shaft hole. A main shaft having a notch formed in the window, a movable shaft fitted into the shaft hole of the main shaft so as to be vertically movable, and a lower end of the movable shaft pivotally supported by a pin so as to be tiltable at a predetermined angle with respect to the axis, A diameter increasing jig including a hook member that slides on the tapered surface of the main shaft by the downward movement and tilts to project the molding surface outward from the window,
The main surface of the jig is supported so that the movable shaft protrudes from the upper end opening of the shaft hole so as to be able to move up and down. A press expanding device that presses the lower end of the branch pipe, expands the lower end of the branch pipe in a trumpet shape from the inside to the outside, and forms an outer diameter larger than the diameter of the branch port. The press expanding device is provided with a raising and lowering rotation mechanism with a manual handle for raising and lowering and rotating the main shaft of the diameter expanding jig.

According to a third aspect of the present invention, in the second aspect of the present invention, there is provided an engaging device for positioning the hook member when the hook member tilts and the molding surface projects outward from the window. According to a fourth aspect of the present invention, in the third aspect, a lock mechanism for locking the movable shaft and the main shaft when the hook member is positioned by the locking means is provided.

[0008]

As described above, since the inner surface of the lower end of the branch pipe attached to the branch port of the fluid pipe is formed as a large-diameter section whose outer diameter is larger than the branch port, the branch pipe is branched by the large-diameter section. It becomes strong against the power to get out of the mouth.

[0009]

FIG. 1 is a longitudinal sectional front view showing a preferred embodiment of the present invention in which a branch pipe is mounted at a branch port of a fluid pipe. 1
A branch pipe has a thin-walled hollow cylindrical pipe main body 2 having a lower end formed in an enlarged diameter portion 3, and a rubber ring 4 is fitted on the outer peripheral surface of the pipe main body 2. Reference numeral 6 denotes a ductile pipe as a fluid pipe, and reference numeral 7 denotes a branch port formed in the ductile pipe 6. The inner surface of the enlarged diameter portion 3 of the pipe body 2 has an outer diameter of a branch port 7.
It is formed in a trumpet shape (convex curved surface) so as to be larger, and the outer edge of the enlarged diameter portion 3 is located near the inner surface of the tube 6.

A flange 10 is formed on the outer peripheral surface of the upper end of the rubber ring 4 protruding from the branch port 7, and the inner peripheral surface of the lower end facing the inner surface of the pipe 6 from the branch port 7 has an annular protrusion as shown in FIG. Department
11 are formed. When the branch pipe 1 is inserted into the branch port 7 as described later, the annular protrusion 11 reverses from the previous inward to outward. A flange portion 12 is provided on the outer peripheral surface of the upper end portion of the pipe main body 2 so as to contact the upper surface of the flange portion 10 of the rubber ring 4.

In the above, as shown in FIG.
The outer diameter d of the pipe body 2 is slightly larger than the inner diameter b 'of the branch pipe guide 13 of the rubber ring 4, and the diameter D of the branch port 7 is slightly larger than the outer diameter a of the trunk of the rubber ring 4. Has become.

FIGS. 3, 4 and 5 show a diameter-expanding jig for forming the lower end of the pipe main body 2 of the branch pipe 1 in the diameter-expanded portion 3. FIG. The diameter-enlargement jig 15 has a shaft hole 17 formed on a tapered surface 16 whose upper end is open and whose bottom is inclined downward.
A main shaft 20 in which a hook member projecting window 18 is cut out in a front peripheral wall facing the main shaft 20, a movable shaft 22 fitted in a shaft hole 17 of the main shaft 20 so as to be vertically movable, and a lower end of the movable shaft 22. Pin on the back
At 23, it is pivotally supported to be able to tilt at a predetermined angle with respect to the axis, and the movable shaft 22
The hook member 26 slides on the tapered surface 16 of the main shaft 20 by the downward movement and tilts to project the forming surface 25 outward from the window 18. The shaft hole 17 is drilled at a position slightly eccentric with respect to the center of the main shaft 20 so that the peripheral wall with the window 18 is thicker than the peripheral wall on the opposite side of the window 18 and can withstand a strong bending force. Has become. Another window 27 is cut out on the rear peripheral wall opposite to the window 18.

In this example, the tapered surface 16 is formed on a tapered table 28 fixed below the shaft hole 17 of the main shaft 20, and the tapered table 28 is attached by fixing pins 29 and bolts 30. While the tapered surface 16 is inclined, as shown in FIG.
A locking surface 35 for locking one locking surface 33 of a locking recess 32 formed on the rear surface of the hook member 26 when 25 protrudes from the window 18 is provided. The upper part is a steeply tapered surface 16a, and the lower part is a gently inclined tapered surface 16b. Similarly, reference numeral 36 denotes a locking surface on which the other locking surface 37 of the locking recess 32 of the hook member 26 locks, and is provided on the outer peripheral surface of the upper end of the tapered table 28 connected to the lower end of the tapered surface 16b. . Above the molding surface 25 of the hook member 26, the enlarged lower end of the movable shaft 22
A locking surface 40 that locks with a locking surface 39 formed on 38 is provided. These locking surfaces 39, 40 are locking surfaces 36, 37 and locking surfaces 33,
The hook member 26 is locked together with 35 for positioning. The molding surface 25 projects downward from the outer peripheral surface of the main shaft 20 in a tilted state in which the hook member 26 is positioned by the locking by the locking surfaces (FIG. 6). When the part is expanded while being pressed, the upper part of the enlarged diameter part 3 is prevented from buckling.

A spline 41 for attaching a handle, which will be described later, is formed on the outer peripheral surface of the upper end portion of the main shaft 20. The upper end of the spline 41 is used for a cap nut 43 for fixing an adjusting nut 42 screwed to an upper male screw of the movable shaft 22. A screw 44 is formed concentrically with the shaft hole 17 of the movable shaft 22. The adjusting nut 42 adjusts the vertical movement position of the movable shaft 22 by loosening or tightening by screwing to the upper male screw of the movable shaft 22 as described above. The cap nut 43 is removed when the movable shaft 22 is moved up and down, and is attached in a tilted state in which the hook member 26 is positioned.
And serves to lock the spindle 20. At the same time hook member 26
Of the movable shaft 22 is also pressed and fixed by the enlarged portion 38 at the lower end of the movable shaft 22. An elevating screw 45 is formed on the outer peripheral surface of the main shaft 20 below the spline 41 to be screw-fitted to an elevating member described later. The outer diameter of the movable shaft 22 is larger than the width of the window 18 in the circumferential direction.

The above-described diameter expanding jig 15 is connected to a press diameter expanding device 47 shown in an enlarged manner in FIGS. The press expanding device 47 includes a main body 50 having an inner chamber 48 at an upper portion, and a lower end flange portion 51 of the main body 50 is attached to an upper end flange portion 53 of an upper tube 52 by a bolt nut 54. The upper pipe 52 has a connection portion 55 at a lower end portion.
And is screwed and connected to the upper end of the pipe main body 2 of the branch pipe 1. On the outer peripheral surface of the upper end of the upper pipe 52, a projection 57 for holding the branch pipe 1 under pressure is provided. The main shaft 20 passing through the inside of the pipe main body 2 and the inside of the upper pipe 52 of the branch pipe 1 penetrates the main body 50 up and down including the internal chamber 48, and the main shaft penetrated therethrough.
A handle 58 for rotating the main shaft 20 is fitted to the spline 41 and is fixed to the upper end of the nut 20 with a cap nut 43. With this configuration, when the main shaft 20 is rotated by operating the handle 58,
The main shaft 20 moves up and down while rotating with respect to the elevating member 59 fitted with the screw.

A recess 60 is formed at the bottom of the inner chamber 48 through which the main shaft 20 passes, and has a female screw 61 which is screwed with the elevating screw 45 of the main shaft 20, and an elevating member 59 which is screw-fitted to each other. Although the lower half can engage the rotation stop protrusion 64 provided on the outer periphery of the rotation stop groove 64 provided on the inner periphery of the recess 60, it is possible to move up and down,
It is housed non-rotating. A disc-shaped top plate 65 is provided at the upper end of the elevating member 59. Top plate 65 and top plate 49 of internal chamber 48
A spring that pushes the elevating member 59 down
66 are interposed. 67 is a positioning projection of the spring 66. On both sides (up and down sides in FIG. 9) of the elevating member 59, a horizontal lever 68 is disposed pivotally supported by a shaft 71 between a support piece 70 erected on the bottom of the internal chamber 48 and the main body 50. A roller 72 is rotatably attached to an end of the lever 68 on the lifting member 59 side by a shaft 73. The opposite sides of the two levers 68 from the roller 72 are connected by a connecting member 68a. Roller 7 on both levers 68
A drive shaft 75 is supported on the main body 50 in the direction orthogonal to the upper side opposite to the side 2, and mounting plates 76 are fixed to both ends of the drive shaft, and rollers 77 and 78 are provided at both ends of the mounting plate. It is rotatably mounted by 81 and 82.

A handle 83 is attached to one end of the drive shaft 75 that penetrates the main body 50, and is fixed with a nut 84. When the handle 83 is operated and the drive shaft 75 is rotated by this configuration, the roller 77 or 78 on the mounting plate 76 presses the lever 68 to rotate the lever 71 clockwise about the shaft 71 in FIG. The protrusions 59a provided on both lower sides of the top plate 65 of the elevating member 59 are pushed up by the roller 72, the elevating member 59 is raised against the spring 66, and the main shaft 20 screwed to the elevating member 59 is raised. Is possible. Further, when the main shaft 20 is rotated by operating the handle 58, the main shaft 20 moves up and down while rotating with respect to the elevating member 59 fitted with the screw.

FIG. 11 is a view showing another connection example of the branch pipe and the upper pipe. In this example, the short pipe branch pipe 86 and the upper pipe 52 are placed between the short pipe branch pipe and the upper pipe 52 in a place where human hands cannot reach, such as underground. When connecting and arranging soft pipes, a branch pipe 86 and a plastic pipe 87 are connected, a reinforcing pipe 88 is attached to the outer periphery of the plastic pipe, and the pipe is fixed with a fixing nut 89. .

A method for attaching the branch pipe 1 to the branch port 7 of the pipe 6 will be described below.

First, as shown in FIG. 12, a starting table 93 provided with a jack 92 is installed in an excavation section 91 in which a buried pipe for drawing is disposed, and the starting table 93 is adjusted to an angle of the pipe 6 buried underground. Starting platform
The excavator 94 is excavated at the mounting tube 6 at 93, and the sleeve 95 is inserted at the same time. When the outer periphery of the pipe 6 is reached, the excavator 94 is pulled out, the sleeve 95 is left, and the remaining soil in the sleeve is removed by a vacuum pump or the like (not shown). Next, as shown in FIG. 13, a drilling machine 96 is attached to the starting table 93, the drilling tool is lowered from the excavation pit, the pipe 6 is drilled, and the branch port 7 is opened.

Next, after the drilling machine 96 is removed, 15 parts of the diameter-expanding jig of the press diameter-expanding device 47 on the starting table 93, that is, the press diameter-expanding device 47 attached with the upper pipe 52 and the bolt nut 54 are sleeved. The branch pipe 1 is inserted into the pipe 95 and is attached via the protrusion 57 of the upper pipe 52. Then, the branch pipe 1 is lowered, and the rubber ring 4 attached to the tip of the branch pipe 1 is inserted into the branch port 7 (FIG. 1).
4, 15, 16). Further, pressure is applied from above by a jack 92 to push the lower end of the pipe body 2 of the branch pipe 1 into the rubber ring 4 and push it until the lower end face of the pipe body 2 comes out from the lower end face of the rubber ring 4 (FIG.
17). At this time, the rubber ring 4 comes into contact with the outer peripheral surface of the pipe 6 having the branch port 7 so that the upper flange portion 10 stops and is integrated with the pipe main body 2. The flange portion 12 abuts and strongly presses the flange portion 10 of the rubber ring 4. As a result, the annular protrusion 11 of the rubber ring 4 is inverted from the inward direction to the outward direction, and the rubber ring 4 is pressed into the space between the rubber ring 4 and the rim of the branch port 7, and between the rubber ring 4 and the pipe main body 2. The seal between the outer peripheral surfaces is maintained.

Then, the handle 58 of the press expanding device 47 is operated to lower the main shaft 20 while rotating it, so that the pin 23 of the hook member 26 is lower than the lower end surface of the pipe main body 2.
Then, loosen the adjustment nut 42 and move the movable shaft 22 manually to the main shaft.
Move down against 20. When the movable shaft 22 starts to move, the hook member 26 descends while sliding on the tapered surface 16a, and
Transfer to 6b. Still descending, the locking surfaces 33 and 3
5. The locking surface 37 and the locking surface 36, and the locking surface 40 and the locking surface 39 respectively abut and lock (FIGS. 17 → 18). After locking, the adjustment nut 42 above the movable shaft 22 is fixed with the cap nut 43. As a result, the hook member 26 is firmly locked, and the molding surface 25 is
It becomes a tilting state protruding from 18.

Next, the handle 58 is operated to rotate the main shaft 20 in the opposite direction and raise the main shaft 20 so that the molding surface 25 of the hook member 26 comes into contact with the lower end surface of the tube body 2. Thereafter, the drive shaft 75 is rotated by operating the handle 83. Ie drive shaft
When the roller 75 is rotated, the roller 77 on the mounting plate 76 presses the lever 68 and rotates clockwise around the shaft 71, whereby the roller 72 moving upward moves the lifting member 59 up against the spring 66. Then, the main shaft 20 screwed to the elevating member 59 is raised, whereby the lower end surface of the pipe body 2 is pressed from the forming surface 25 of the hook member 26. Furthermore, while the drive shaft 75 is rotating, the mounting plate 76
Is in the horizontal position, the lever 68 is in a free state, and the elevating member 59 is pushed down by the spring 66. In this manner, the rotation of the drive shaft 75 is converted into a repetition of the up-down movement of the hook member 26, and the pressing and release of the pressing by the forming surface 25 of the hook member 26 are performed. In addition, one rotation of the main shaft 20 by operating the handle 58 also moves up the small pitch. As a result, the diameter of the lower end surface of the pipe body 2 is gradually increased to form a trumpet-shaped enlarged portion 3. FIGS. 19, 20, and 21 show the state of the diameter expanding operation. The outer diameter of the lower end of the tube main body 2 formed in the trumpet-shaped enlarged diameter portion 3 is larger than the diameter of the branch port 7 of the tube 6. At the time of this diameter expansion, the lower end surface of the pipe main body 2 which is pressed from the molding surface 25 of the hook member 26 incorporated in the main shaft 20 that moves up and down in small increments (and is rotated and moved up and down by the handle 58) is a rubber ring 4 Including the annular projection 11 at the lower end of
And the upper part is easily formed in the enlarged diameter part 3 so that it may be pressed against the inner surface of the pipe without buckling.

When the diameter expansion is completed, the handle 83 is operated to rotate the drive shaft 75 so that the mounting plate 76 is substantially horizontal as before, while the handle 58 is operated to rotate the main shaft 20, and the hook The member 26 is lowered again so that it can be stored in the shaft hole 17. Thereafter, the cap nut 43 is removed, the adjustment nut 42 is tightened, and the movable shaft 22 is pulled up. This allows the hook member 26
Are housed in the shaft hole 17.

After the work of expanding the diameter, the bolts and nuts 54 of the flange portion 51 of the press expanding device 47 and the flange portion 53 of the upper pipe 52 are loosened, and the press expanding device 47 is removed. In addition, the connecting portion (the fixing nut 89 in FIG. 11) between the upper pipe 52 and the branch pipe 1 is loosened and removed, and the starting table 93 is removed (FIG. 22). After a while, the sleeve
Extract 95 and fill the gap with earth and sand. Next, when the branch pipe 1 is connected to the buried pipe 97 for retraction and the cutout portion 91 is backfilled, the construction is completed (FIG. 23).

[0026]

According to the first and second aspects of the present invention, since the branch pipe is attached as described above, the following excellent effects are obtained. (1) When a pull-out force acts on the branch pipe, the outer diameter of the enlarged-diameter portion at the lower end of the pipe body is larger than the diameter of the branch port. (2) Since the rubber ring is pushed out and the pipe body is pressed in,
Irrespective of the difference in the height of the rim of the branch port, the surface pressures of the rim of the rubber ring and the branch port and the outer peripheral surfaces of the rubber ring and the pipe main body are uniform, and there is no concern about the sealing mechanism. (3) Even if a large lateral force is applied to the branch pipe and the pipe is tilted, the lateral force is easily absorbed by the elasticity of the inverted flange at the upper end flange of the rubber ring and the lower end of the rubber ring. It can be easily bent without damaging the loop. (4) When the ductile pipe is pierced, the lower part of the rubber ring after pushing the branch pipe is in an open state even for unstable shapes such as chipping and peeling of the rim of the lining layer. It does not affect the compaction of the rubber ring in the water stop section. (5) Even if chips generated when the fluid pipe is pierced remain at the top of the pipe above the branch port, the upper flange portion of the rubber ring is depressed,
Absorb swarf. Chips do not fall off due to vibrations caused by earthquakes, other works, or vibrations caused by vehicles. If it falls off, it does not affect the press fit of the rubber ring. (6) Even if a cleaning bullet for cleaning the inner surface of the pipe is inserted into the inner surface of the pipe after the branch pipe is attached to the fluid pipe, the enlarged diameter portion of the pipe body is rounded, so that the cleaning bullet does not get caught. . (7) There is no need to excavate the outer periphery of the fluid pipe to a large extent, and the water can be reliably stopped. (8) Since the hook is formed from the lower end face of the branch pipe by rotating it little by little while repeatedly pressing (pressing / releasing) on the forming face of the hook member and pulling up, no buckling occurs and friction between the forming face and the lower end face of the branch pipe. And the seizure of the enlarged diameter portion does not occur.

According to the third aspect of the present invention, in addition to the above, the buckling of the branch pipe does not occur since the hook member is supported from the inside of the branch pipe by the locking means when the diameter is further expanded. According to the invention of claim 4, since the movable shaft and the main shaft can be further locked by the lock mechanism, the hook member can be firmly locked and the operation can be performed safely.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a state in which a branch pipe according to an embodiment of the present invention is attached to a branch port of a fluid pipe.

FIG. 2 is a longitudinal sectional front view before mounting showing a dimensional relationship of each part of a branch pipe, a rubber ring, and a branch port of a fluid pipe.

FIG. 3 is a vertical sectional front view of the diameter expanding jig.

FIG. 4 is a left side view of the same.

FIG. 5 is a bottom view of the same.

FIG. 6 is an enlarged vertical sectional front view showing a state where a molding surface of a hook member of FIG. 3 is protruded.

FIG. 7 is an enlarged vertical sectional front view of a state before a molding surface of the hook member is protruded.

FIG. 8 is a longitudinal sectional front view showing the connection between the diameter expanding jig and the press diameter expanding device.

FIG. 9 is a cross-sectional plan view of the press expanding device taken along line AA of FIG. 10;

10 is a vertical sectional front view of the press expanding device taken along line BB of FIG. 9;

FIG. 11 is a partially omitted longitudinal front view showing another connection example of the branch pipe and the upper pipe.

FIG. 12 is an operation explanatory view.

FIG. 13 is an operation explanatory view.

FIG. 14 is an operation explanatory view.

FIG. 15 is an operation explanatory view.

FIG. 16 is an operation explanatory view.

FIG. 17 is an operation explanatory view.

FIG. 18 is an operation explanatory view.

FIG. 19 is an operation explanatory view.

FIG. 20 is an operation explanatory view.

FIG. 21 is an operation explanatory view.

FIG. 22 is an operation explanatory view.

FIG. 23 is an operation explanatory view.

FIG. 24 is a longitudinal sectional front view showing a state in which a conventional branch pipe is attached to a branch port of a fluid pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Branch pipe 2 Pipe main body 3 Large diameter part 4 Rubber ring 6 Fluid pipe 7 Branch port 15 Large diameter jig 16 Tapered surface 20 Main shaft 22 Movable shaft 25 Molding surface 26 Hook member 33,35,36,37,39,40 Stop surface 47 Press expanding device 58, 83 Handle 59 Elevating member

Continuation of the front page (56) References JP-A-4-312284 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E03B 7/00 E03B 7/02 E03B 7/07 F16L 41 / 00-41/18

Claims (4)

(57) [Claims] An upper end has an opening and a bottom portion has a shaft hole formed in a tapered surface inclined downward, and a hook member projecting window is cut out in a peripheral wall facing the tapered surface of the shaft hole. A main shaft, a movable shaft fitted to the shaft hole of the main shaft so as to be movable up and down, and a lower end of the movable shaft pivotally supported by a pin so as to be tiltable at a predetermined angle with respect to the axis, and a taper of the main shaft by the downward movement of the movable shaft A hook member that slides on the surface and tilts to project the molding surface outward from the window, and a flange is formed on the outer peripheral surface of the lower end of the main shaft of the diameter increasing jig. A thin-walled branch pipe is fitted and supported, and a flange portion is formed on the outer peripheral surface of the upper end, and a rubber ring having an annular projection formed on the inner peripheral surface of the lower end is fitted on the outer peripheral surface of the lower end of the branch pipe. After supporting the branch pipe and rubber ring, a diameter-enlargement jig is pierced from the lower end into the fluid pipe. After press-fit into the branch port, the flange portion of the rubber ring contacts the outer peripheral surface of the fluid pipe, and the flange portion of the branch pipe contacts the flange portion of the rubber ring,
The movable shaft is moved downward with respect to the main shaft projecting downward from the lower end of the branch pipe by the contact of the two flange portions so that the hook member is tilted so that the molding surface protrudes outward from the window. While rotating the main shaft, the main shaft is moved up and down in small increments, and the lower end of the branch pipe is pressed by the molding surface of the hook member. A method for mounting a branch pipe, wherein the branch pipe is formed into a larger diameter portion. 2. A shaft member having an upper end opened and a bottom formed on a tapered surface inclined downward, and a hook member projecting window is formed in a notch on a peripheral wall facing the tapered surface of the shaft hole. A main shaft, a movable shaft fitted to the shaft hole of the main shaft so as to be movable up and down, and a lower end of the movable shaft pivotally supported by a pin so as to be tiltable at a predetermined angle with respect to the axis, and a taper of the main shaft by the downward movement of the movable shaft A diameter increasing jig composed of a hook member that slides on a surface and tilts to project a molding surface outward from the window, and a movable shaft that projects a main shaft of the diameter increasing jig from an upper end opening of a shaft hole. As described above, the lower end of the branch pipe is pressed by the molding surface of the hook member that is tilted by the downward movement of the movable shaft and protrudes outward from the window, and the lower end of the branch pipe is moved from inside to outside. To form a large-diameter part with an outside diameter larger than the diameter of the branch port. An apparatus for mounting a branch pipe, comprising: a press expanding device; and a lifting / lowering rotating mechanism with a manual handle for raising and lowering and rotating a main shaft of the expanding device. 3. The branch pipe mounting device according to claim 2, further comprising a locking means for positioning the hook member when the hook member tilts and the molding surface projects outward from the window. 4. The branch pipe mounting device according to claim 3, further comprising a lock mechanism for locking the movable shaft and the main shaft when the hook member is positioned by the locking means.