JPH0740145Y2 - Branch connection fitting connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a connection structure of a pipe and a branch connection pipe joint for branch-connecting a branch pipe to a peripheral wall of the pipe.

(Prior Art) Conventionally, as a connection structure of this type of branch connection pipe joint, for example, a structure as disclosed in JP-A-60-151411 is known.

In this connection structure, as shown in FIG. 13, a branch hole b is bored in the peripheral wall of the ribbed pipe a, and the base end portion of the branch pipe connecting portion c is inserted into the branch hole b and the base end portion of the branch pipe connection portion c is inserted. A saddle part d protruding from the outer periphery is applied to the outer surface of the ribbed pipe a, and the saddle part d
The protrusions e protruding between the ribs are fitted between the ribs f of the ribbed pipe a and joined together, whereby a gap is created between the joint surface of the saddle part d and the outer peripheral surface of the ribbed pipe a. And the branch connection pipe joint is firmly connected to the ribbed pipe a.

Also, as another connection structure, a structure as disclosed in Japanese Patent Publication No. 62-2196 is known.

In this connection structure, as shown in FIG. 14, a flange-shaped protrusion h is provided on the lower portion of the pipe member g over the entire circumference thereof, and a large number of notches i that enable the deformation of the protrusion h.
Is provided along the pipe axis direction, while an annular space portion 1 formed by a collar k having a skirt j and an outer surface of the branch pipe member g is provided on the outer peripheral portion of the pipe member g. The protrusion h provided on the member g is the main pipe m.
Is fixed by a bush member o for avoiding the deformation of the projection h, while the annular space 1 provided in the pipe member g engages with the outer surface of the main pipe m. The ring-shaped sealing member p is accommodated.

Further, as another connection structure, in British Patent No. 2120340, a short pipe having a notch and a locking portion is arranged in an opening of a main pipe, and an outer portion having a skirt portion through an O-ring is provided on the outer periphery thereof. There is disclosed a structure in which a cylinder is covered, and a cylinder with a receptacle is screwed and fixed to the short tube through another O-ring.

(Problems to be Solved by the Invention) However, the conventional connection structure described above has the following disadvantages.

That is, in the connection structure disclosed in Japanese Unexamined Patent Publication No. 60-151411, it is generally difficult to accurately form the branch hole b in the ribbed pipe a at the construction site, and the projection of the saddle portion d is difficult. Since the forming accuracy of the e and the ribbed pipe a is not so high, when the base end portion of the branch pipe connecting portion c is aligned with the branch hole b, the protrusion e and the ribs f do not always match completely. The intervals between the protrusions e and the ribs f were likely to be uneven. Therefore, in this type of connection structure, a high-viscosity bonding agent having an excellent filling effect is often used, but such a bonding agent is uniformly applied to the bonding surface of the saddle portion d or the outer peripheral surface of the ribbed pipe a. It is difficult to apply the adhesive in a thickness because the viscosity of the adhesive is high. Therefore, the application of the adhesive is troublesome and the connecting work is troublesome. Further, even if an attempt is made to spread the above-mentioned bonding agent by pressing the saddle portion d against the ribbed pipe a to make the coating thickness uniform, it is difficult because the bonding agent has a high viscosity, and therefore the bonding of the saddle portion d is difficult. High joining strength cannot be obtained between the surface and the ribbed pipe a, resulting in inferior sealing performance.

Also, Japanese Patent Publication No. 62-2196 and British Patent No. 2120340.
In the connection structure disclosed in the publication, there is a disadvantage that the manufacturing cost becomes high because the structure is complicated. Further, there is an inconvenience that it cannot be used for a ribbed pipe and a pipe having a convex shape.
Further, there is a problem that the strength is weak against lateral pressure and the like when attached to the buried pipe.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a connection structure for a branch connection pipe joint that can be easily mounted in a state in which the sealing property and the bonding strength are secured.

(Means for Solving the Problems) The connection structure of a branch connection pipe joint of the present invention is a connection structure of a pipe body and a branch connection pipe joint for branch-connecting a branch pipe to a peripheral wall of the pipe body, The branch connection pipe joint is formed with a locking projection that can be locked in a branch hole formed in the pipe body, and a flexible portion in which a collar portion that can closely contact a seal member is formed between the locking projection and the inner peripheral edge portion of the branch hole. And an insertion section into which the inner tube can be loosely inserted, and a saddle section curved with a radius of curvature smaller than the radius of curvature of the tube outer circumference of the tubular body are formed at the base end of the insertion section. An outer tube, and an outer tube having a locking piece that is locked to the flange of the inner tube and an abutment step portion that abuts the end of the insertion section of the outer tube. The inner pipe is locked to the outer peripheral edge portion of the branch hole formed at a proper position on the peripheral wall of the inner pipe while protruding outward, and at least the collar portion of the inner pipe is formed. And a seal member is arranged at the protruding end of the inner pipe, the insertion portion of the outer insertion pipe is loosely inserted in the outer peripheral portion of the inner pipe, and the contact step portion of the outer pipe is inserted at the insertion end of the outer insertion pipe. In contact with the outer tube, the outer tube is inserted into the inner peripheral portion of the inner tube, the curvature of the saddle portion of the outer insertion tube is changed, and the outer tube is abutted so as to substantially follow the outer circumference of the tubular body. The locking piece of the outer tube is locked to the flange portion of the inner tube against the repulsive force generated by the inner tube, and the inner tube is brought into close contact with the branch hole via the seal member.

Further, the connection structure of the branch connection pipe joint of the present invention is a pipe body,
A connection structure with a branch connection pipe joint for branch-connecting a branch pipe to a peripheral wall of the pipe body, wherein the branch connection pipe joint comprises a connection portion connectable to a branch hole formed in the pipe body, and the branch. An inner tube having a collar portion capable of closely contacting a seal member with an inner peripheral edge portion of the hole, an insertion portion into which the inner tube can be loosely inserted, and a pipe of the tubular body at a proximal end portion of the insertion portion. An outer insertion tube in which a saddle portion is formed so as to be substantially along the outer circumference, a screwing portion that can be screwed into the outer peripheral portion of the inner tube, and an abutment step at which the end of the insertion portion of the outer insertion tube abuts. The inner pipe protrudes outward at the outer peripheral edge portion of the branch hole formed at a proper position on the peripheral wall of the pipe body. In this state, the seal member is arranged at least on the flange portion and the connection portion of the inner pipe, and the reinforcing pipe is inserted into the inner peripheral portion of the inner pipe. On the other hand, while the insertion portion of the outer insertion tube is loosely inserted in the outer peripheral portion of the inner tube, and the contact step portion of the screwing member is in contact with the insertion end portion of the outer insertion tube, the inner tube A screw member is screwed onto the outer peripheral portion of the outer tube so that the saddle portion of the outer insertion tube is brought into contact with the outer peripheral portion of the tube body substantially along the outer circumference thereof, and the inner tube is brought into close contact with the branch hole through the seal member. It was done by.

(Operation) The connection structure of the branch connection pipe joint of the present invention according to claim 1 is
First, the inner pipe of the branch connection pipe joint is locked to the peripheral edge of the branch hole formed at a proper position on the peripheral wall of the ribbed pipe in a state of protruding outward, and at least the flange portion and the protruding end portion of the inner pipe are sealed. Place the members. At this time, since the entire inner pipe has flexibility, the collar portion located at the inner peripheral edge portion of the branch hole is pushed into the branch hole while slightly deforming the inner pipe, so that the collar part is brought into contact with the branch hole. You can Then, while the insertion portion of the outer insertion tube is loosely inserted into the outer peripheral portion of the inner tube, and the contact step portion of the outer tube is in contact with the insertion end portion of the outer insertion tube,
The outer tube is inserted into the inner peripheral portion of the inner tube, the saddle portion of the outer insertion tube is abutted so as to substantially follow the outer circumference of the tube body, and the locking piece of the outer tube is locked to the flange portion of the inner tube. . At this time, since the saddle portion of the outer insertion tube is curved to have a radius of curvature smaller than the radius of curvature of the outer circumference of the tubular body, a repulsive force is generated by abutting substantially along the outer circumference of the tubular body. It will be. Further, since the locking piece of the outer pipe is locked against the repulsive force, the collar portion of the inner pipe to which the locking piece is locked is provided with the inner peripheral edge of the branch hole through the seal member. It comes into close contact with the part.

Further, in the connection structure of the branch connection pipe joint of the present invention as set forth in claim 2, first, the inner pipe of the branch connection pipe joint is projected outward at the peripheral edge of the branch hole formed at an appropriate position on the peripheral wall of the ribbed pipe. In this state, the seal member is locked, and at least the seal member is arranged at the collar portion and the connecting portion of the inner pipe. Then, while the reinforcing tube is inserted into the inner peripheral portion of the inner tube, the insertion portion of the outer insertion tube is loosely inserted into the outer peripheral portion of the inner tube, and the insertion end portion of the outer insertion tube is provided with the screwing member. A screwing member is screwed onto the outer peripheral portion of the inner pipe with the contact portion in contact with each other. As a result, the saddle portion of the outer insertion tube is abutted so as to substantially follow the outer circumference of the tube body. In addition, the flange portion of the inner pipe comes into close contact with the inner peripheral edge of the branch hole via the seal member.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 (a) is a front sectional view showing a connection structure of a branch connection pipe joint 2 (hereinafter, simply referred to as a pipe joint) to a ribbed pipe 1, and FIG. FIG. 2 is a partially cutaway side view of the pipe joint, and FIG. 2 is an exploded perspective view of the connection structure.

In the figure, the connection structure of the pipe joint 2 utilizes the repulsive force of the saddle portion 42 to seal the seal member 8 between the inner pipe 3 and the branch hole 12.
Is designed to be closely attached.

That is, a branch hole 12 is formed at a proper position on the outer circumference of the ribbed pipe 1 having a large number of annular ribs 11 on the outer peripheral surface, and the inner pipe 3 is locked to the outer peripheral edge of the branch hole 12 in a state of protruding outward. At the same time, the seal member 8 is interposed from the flange portion 32 of the inner pipe 3 to the projecting end portion, and the insertion portion of the outer insertion pipe 4 is provided on the outer peripheral portion of the inner pipe 3.
The outer tube 5 is inserted into the inner peripheral portion of the inner tube 3 with 41 inserted loosely and the abutting step portion 52 of the outer tube 5 abutting on the insertion end portion of the outer insertion tube 4. The curvature of the saddle portion 42 is changed so that the saddle portion 42 is brought into contact with the ribbed tube 1 so as to be substantially along the outer circumference thereof, and the locking piece 53 of the outer tube 5 is opposed to the inner tube 3 against the repulsive force generated thereby. The inner tube 3 is locked to the collar portion 32, whereby the inner tube 3 is in close contact with the branch hole 12 via the seal member 8.

The ribbed tube 1 has a large number of annular ribs 11 on its outer peripheral surface and is made of synthetic resin, ceramic, metal or a composite material thereof. The ribbed pipe 1 according to the present invention is not limited to the annular rib 11 shown in FIG. 1 having a simple brim shape. For example, the annular rib 11 having a corrugated cross-sectional shape shown in FIG. The cross-sectional shape as shown in FIG. 7B may be trapezoidal, or the cross-sectional shape as shown in FIG. In addition, although the ribbed pipe 1 is used in the present embodiment, the present invention is not limited to this, and a normal tubular body having no ribs may be used.

The pipe joint 2 includes a locking projection 31 that can be locked in the branch hole 12 formed in the ribbed pipe 1, and a collar portion 32 that can closely contact the seal member 8 with the inner peripheral edge of the branch hole 12. The formed flexible inner tube 3, an insertion portion 41 into which the inner tube 3 can be loosely inserted, and a base end portion of the insertion portion 41 are curved so as to substantially follow the outer circumference of the ribbed tube 1. Tube 4 having a saddle 42 formed therein
And an outer tube 5 having an abutting step portion 52 with which the insertion end portion of the outer insertion tube 4 abuts and an engagement piece 53 that is engaged with the flange portion 32 of the inner tube 3. There is.

The inner pipe 3 is curved so that its lower end opening surface matches the branch hole 12, and an annular flange 32 is formed on the lower end outer peripheral surface.
And a ring-shaped groove 33 in which the seal member 8 can be inserted is formed in the collar portion 32. The inner pipe 3 is closely attached to the inner peripheral edge of the branch hole 12 via the seal member 8. Further, in order that the inner pipe 3 may be locked in the branch hole 12 in this state, a locking projection 31 that locks to the outer peripheral edge portion of the branch hole 12 is formed on the outer peripheral surface of the inner pipe 3 by the collar portion 32. To the rib tube 1 at a position separated by the wall thickness of the ribbed tube 1. Since the inner tube 3 thus configured has flexibility in consideration of workability,
It is desirable to be formed of an elastic material or a composite material containing an elastic material.

The outer insertion tube 4 is configured such that the inner tube 3 can be loosely inserted into the cylindrical insertion portion 41 having an inner diameter slightly larger than the outer diameter of the inner tube 3. In addition, the base end portion of the insertion portion 41,
A saddle portion 42 curved to a radius of curvature smaller than the radius of curvature of the outer circumference of the ribbed pipe 1 is formed. The length of the insertion portion 41 is set so that the protruding end portion of the inner pipe 3 is located inside the insertion portion 41 with the saddle portion 42 in contact with the outer circumference of the ribbed pipe 1. It is slightly longer than the protruding length of.

The outer tube 5 has a cylindrical connection portion 51 having an outer diameter slightly smaller than the inner diameter of the inner tube 3 and a receptacle having a diameter substantially equal to the outer diameter of the insertion portion 41 of the outer insertion tube 4. It is formed integrally with the portion 55. Further, at the lower end of the connecting portion 51, a locking piece 53 that is locked to the collar portion 32 of the inner pipe 3 is provided so as to project outward, and the locking piece 53 is provided with flexibility. Therefore, in order to extend from the lower end of the outer pipe 5 in the pipe axial direction, the connecting portion
A large number of notches 54 are provided in the whole 51. further,
An annular groove 551 along the circumferential direction is formed on the inner peripheral surface of the receiving portion 55, and the O-ring 9 that is in contact with the outer peripheral surface of the end portion of the branch pipe 10 is fitted into the annular groove 551. The enlarged diameter portion of the outer peripheral surface of the outer tube 5 is formed as a contact step portion 52, which abuts on the protruding end portion of the outer insertion tube 4 and closely contacts the protruding end portion of the inner tube 3 via the seal member 8. It is done like this. On the other hand, the enlarged diameter portion of the inner peripheral surface of the outer tube 5 is formed as a locking step wall 56,
It is designed to restrict the entry of the branch pipe 10 into the ribbed pipe 1.

As shown in FIG. 4, the seal member 8 is integrally formed of an elastic body such as rubber so as to cover the entire inner pipe 3 from the annular groove 33 of the inner pipe 3 to the projecting end portion.
That is, since the sealing member 8 also covers the locking projection 31 of the inner pipe 3, the locking of the inner pipe 3 in the branch hole 12 is substantially performed via the sealing member 8. Becomes

Next, a method of connecting the pipe joint 2 to the ribbed pipe 1 as described above will be described.

First, a branch hole 12 is formed at a proper position on the peripheral wall of the ribbed pipe 1.
The diameter of the branch hole 12 is substantially equal to the outer diameter of the inner tube 3 with the outer peripheral portion covered with the seal member 8.

Next, the seal member 8 is mounted from the flange portion 32 of the inner pipe 3 to the projecting end portion, and the flange portion 32 of the inner pipe 3 is inserted into the branch hole 12 while slightly deforming it, whereby the branch hole 12 The seal member 8 is brought into contact with the inner peripheral edge portion, and the branch hole is formed.
The locking projection 31 is locked to the outer peripheral edge of 12 via the seal member 8 so that the inner tube 3 is projected outward.

Subsequently, the insertion portion 41 of the outer insertion tube 4 is inserted into the outer peripheral portion of the seal member 8 covering the inner tube 3 and the outer insertion tube 4 is inserted.
The connecting portion 51 of the outer pipe 5 is inserted into the inner peripheral portion of the inner pipe 3 in a state where the contact step portion 52 of the outer pipe 5 is in contact with the protruding end of the inner pipe 3.

Then, as shown in FIG. 5, the saddle portion 42 of the outer insertion tube 4 is abutted so as to substantially follow the outer circumference of the ribbed tube 1, and
The locking piece 53 of the outer pipe 5 is locked to the collar portion 32 of the inner pipe 3. At this time, since the saddle portion 42 of the outer insertion tube 4 is curved to have a radius of curvature smaller than the radius of curvature of the outer circumference of the ribbed tube 1, the saddle section 42 should come into contact with the outer circumference of the ribbed tube 1 substantially along the outer circumference thereof. Will generate repulsive force. Further, since the locking piece 53 of the outer tube 5 is locked against the repulsive force, the flange portion 32 of the inner tube 3 to which the locking piece 53 is locked is the same as that of the flange portion 32. The annular groove 33 is brought into close contact with the inner peripheral edge portion of the branch hole 12 via the seal member 8.

In addition, in this embodiment, although the ribbed pipe 1 is shown,
As shown in the figure, the present invention can be carried out even with a simple tubular body 15 having no rib 11.

Further, as shown in FIGS. 7 and 8, a connection structure may be provided in which separate sealing members 81 and 82 are provided at the projecting end portion of the inner pipe 3 and the collar portion 32. In this case, the branch hole 12 is formed to have a diameter substantially the same as the outer diameter of the inner pipe 3. Then, the locking projection 31 of the inner pipe 3
The inner pipe 3 is directly locked in the branch hole 12 by. Further, in the case of this connection structure, when the sealing member 81 interposed at the projecting end of the inner pipe 3 has a shape as shown in FIG. Since the seal member 81 is directly interposed between the protruding end portion of the intubation 4 and the sealability can be improved.

Second Embodiment FIG. 10 (a) is a front sectional view showing a connecting structure of the branch connection pipe joint 2 to the ribbed pipe 1, and FIG. 10 (b) is a partially cutaway side view of the pipe joint. , FIG. 11 is an exploded perspective view of the connection structure.

In the drawing, in the connection structure of the pipe joint 2, the screw member 6 is screwed into the inner pipe 3 so that the seal member 8 is brought into close contact with the inner pipe 3 and the branch hole 12.

That is, a branch hole 12 is formed at a proper position on the outer circumference of the ribbed pipe 1 having a large number of annular ribs 11 on the outer peripheral surface, and the inner pipe 3 is locked to the outer peripheral edge of the branch hole 12 in a state of protruding outward. At the same time, the seal member 8 is interposed from the flange portion 32 of the inner pipe 3 to the connecting portion 36, and the reinforcing pipe 7 is inserted into the inner peripheral portion of the inner pipe 3 while the outer peripheral portion of the inner pipe 3 is inserted. The insertion portion 41 of the outer insertion tube 4 is loosely inserted into the outer insertion tube 4, and the insertion end portion of the outer insertion tube 4 is in contact with the contact step portion 64 of the screw member 6, and is screwed onto the outer peripheral portion of the inner tube 3. The member 6 is screwed together, whereby the saddle portion 42 of the outer insertion tube 4 is brought into contact with the ribbed tube 1 substantially along the outer circumference thereof, and
The inner pipe 3 is in close contact with the branch hole 12 via the seal member 8.

The same components as those of the first embodiment are designated by the same reference numerals.

The ribbed tube 1 has a large number of annular ribs 11 on its outer peripheral surface and is made of synthetic resin, ceramic, metal or a composite material thereof. The ribbed tube 1 in the present embodiment is not limited to the annular rib 11 shown in FIG. 10 which is merely a collar-shaped one, and for example, the sectional shape shown in FIG. 3 (a) is wavy. The cross-sectional shape as shown in FIG. 2B may be trapezoidal, or the cross-sectional shape as shown in FIG.

The pipe joint 2 has a connecting portion 36 that can be connected to the branch hole 12 formed in the ribbed pipe 1 and a flange portion 32 in which the seal member 8 that can be in close contact with the inner peripheral edge of the branch hole 12 is interposed. Inner tube 3
And an insertion portion 41 into which the inner tube 3 can be loosely inserted, and the insertion portion
An outer insertion tube 4 in which a saddle portion 42 that is curved so as to substantially follow the outer circumference of the ribbed tube 1 is formed at the base end portion of 41, and screw threads 62 that are screwed into the outer circumference portion of the inner tube 3; The screwing member 6 in which the contact step portion 64 with which the end portion of the insertion portion 41 of the outer insertion tube 4 abuts is formed, and the reinforcing pipe 7 that reinforces the connection portion 36 of the inner pipe 2.
It has and.

The inner tube 3 includes a cylindrical connecting portion 36 having an outer diameter slightly smaller than the inner diameter of the branch hole 12, and an insertion portion of the outer insertion tube 4.
It is integrally formed with the receiving portion 34 whose diameter is slightly smaller than the outer diameter of 41. The connecting portion 36 is curved so that its lower end opening surface is aligned with the branch hole 12, and an annular flange portion 32 is projectingly provided on the outer peripheral surface of the lower end portion.
An annular groove 33 in which the seal member 8 can be inserted is formed in 32. Further, a large number of notches 37 are provided from the flange portion 32 along the pipe axis direction of the connecting portion 36. On the other hand, the socket 34
Has screw threads 35 which are screwed onto the outer peripheral surface of the screw member 6.
Is engraved. Further, on the inner peripheral surface of the receiving portion 34,
A locking step wall 38 for preventing the reinforcing pipe 7 and the branch pipe 10 from entering the ribbed pipe 1 is provided around the ribbed pipe 1.

The outer insertion tube 4 is configured such that the inner tube 3 can be loosely inserted into an insertion portion 41 formed in a cylindrical shape having an outer diameter slightly larger than the outer diameter of the receiving portion 34 of the inner tube 3. In addition, this extrapolation tube 4
At the base end portion thereof, a saddle portion 42 which is curved so as to substantially follow the outer circumference of the ribbed pipe 1 is formed. Then, with the saddle portion 42 in contact with the outer circumference of the ribbed tube 1, the screw 35 portion of the inner tube 3 loosely inserted in the outer tube 4 is exposed to the outside. Is shorter than the length of the inner tube 3.

The screw member 6 has a nut portion 61 in which screw threads 62 screwed into the screw threads 35 of the inner tube 3 exposed from the outer insertion tube 4 are engraved.
And a skirt portion 63 having a diameter larger than that of the nut portion 61 so as to cover the projecting end portion of the outer insertion tube 4, and the abutment for abutting the projecting end portion of the outer insertion tube 4 in the skirt portion 63. A step portion 64 is formed.

The reinforcing pipe 7 is formed into a cylindrical shape that can be fitted into the connecting portion 36 of the inner pipe 3, and at one end thereof, a contact step portion 71 that abuts on the locking step wall 38 of the inner pipe 3 is provided. Has been done.

The seal member 8 is integrally formed of an elastic body such as rubber so as to cover the entire connecting portion 36 including the flange portion 32 of the inner tube 3.

Next, a method of connecting the pipe joint 2 as described above to the ribbed pipe 1 will be described.

First, a branch hole 12 is formed at a proper position on the peripheral wall of the ribbed pipe 1.
The diameter of the branch hole 12 is substantially equal to the outer diameter of the inner pipe 3.

Next, the seal member 8 is interposed over the entire connecting portion 36 including the flange portion 32 of the inner pipe 3, and the branch hole 12 is formed while slightly changing the annular groove 33.
After inserting into the inside, the reinforcing pipe 7 is fitted into the connecting portion 36. As a result, the seal member 8 abuts from the inner peripheral edge of the branch hole 12 to the entire connecting portion 36 of the inner pipe 3, and the connecting portion
The reinforcing pipe 7 fitted in the pipe 36 exerts a diametrical expansion force on the connecting portion 36, and the receiving portion 34 of the inner pipe 3 is locked in a state of protruding outward. The reinforcing pipe 7 may be adhesively bonded inside the connecting portion 36.

Then, the insertion portion 41 of the outer insertion tube 4 is loosely inserted into the outer peripheral portion of the receiving portion 34 of the inner tube 3, and the saddle portion 42 of the outer insertion tube 4 is brought into contact with the outer peripheral edge portion of the branch hole 12.

Then, the screwing member 6 is screwed into the screw thread 35 provided in the receiving portion 34 of the inner pipe 3. As a result, the protruding end portion of the outer insertion tube 4 is pressed by the contact step portion 64 of the screwing member 6, and the saddle portion 42 is pressed against the ribbed tube 1. Further, the repulsive force of the pressure contact force that presses the saddle portion 42 acts on the inner pipe 3, and the seal member 8 interposed in the annular groove 33 is compressed and adheres closely to the inner peripheral edge portion of the branch hole 12.

Then, the branch pipe 10 is inserted into the receiving portion 34 of the inner pipe 3, and the branch pipe 10
With the end of the abutting contact with the locking step wall 38 of the inner pipe 3,
The branch pipe 10 is connected to the projecting end portion 34 by screwing and fixing it by the screwing member 60 via the O-ring 9. In this embodiment, the branch pipe 10 is connected by screwing and fixing the screwing member 60 via the O-ring 9.
As shown in FIG. 12, without using the screwing member 60,
It may be one that is directly connected and joined to the inside of 34.

(Effects of the Invention) As described above, according to the present invention, the annular groove of the inner tube is adhered to the inner peripheral edge of the branch hole through the seal member against the repulsive force generated in the saddle portion of the outer insertion tube. Therefore, the sealability and the joint strength can be easily ensured by a simple structure in which the outer pipe is locked in the annular groove of the inner pipe.

Further, according to the present invention, since the saddle portion of the outer insertion tube is pressed against the tube body and the annular groove of the inner tube is brought into close contact with the inner peripheral edge portion of the branch hole via the seal member, the screwing member is screwed. With a simple structure such as fitting, it is possible to easily secure the sealing property and the bonding strength.

[Brief description of drawings]

1 to 12 show drawings according to the present invention, and FIG. 1 (a) is a sectional view showing a connecting structure of a branch connecting pipe joint to a ribbed pipe according to a first embodiment, FIG. b) is a partially broken side view of the pipe joint, FIG. 2 is an exploded perspective view of the connection structure, FIG.
FIGS. 4A to 4C are partially cutaway side views showing other shapes of the ribs of the ribbed tube, FIG. 4 is a partially cutaway view showing the entire structure of the seal member, and FIG. FIG. 6 (b) is a cross-sectional view showing a state before the inner pipe is connected to the ribbed pipe, and FIG. 6 (a) is a cross-sectional view showing a state in which a branch connection pipe joint is connected to a simple pipe body having no ribs. ) Is a partially cutaway side view of the pipe joint, FIG. 7A is a cross-sectional view showing a connection structure of a branch connection pipe joint to a ribbed pipe by a seal member having another shape, and FIG. A partially broken side view of the pipe joint,
8 (a) is a cross-sectional view showing a connection structure in which the ribbed pipe shown in FIG. 7 is replaced by a simple pipe having no ribs, and FIG. 8 (b) is a partially cutaway side view of the pipe joint. FIG. 9A is a partially cutaway perspective view showing still another shape of the seal member,
FIG. 10B is a sectional view showing the connection structure of the branch connection pipe joint to the ribbed pipe by the sealing member of FIG.
Is a sectional view showing a connecting structure of a branch connecting pipe joint to a ribbed pipe according to a second embodiment, FIG. 10 (b) is a partially cutaway side view of the pipe joint, and FIG. 11 is an exploded perspective view of the connecting structure. FIG. 12, FIG. 12 is a cross-sectional view showing another shape of the receiving portion, FIG. 13 is a cross-sectional view showing a connection state of a conventional branch connection pipe joint, and FIG. 14 is a still another conventional branch connection pipe joint. It is sectional drawing which shows a connection state. 1 ... Ribbed pipe 12 ... Branch hole 2 ... Pipe joint 3 ... Inner pipe 31 ... Locking protrusion 32 ... Collar part 36 ... Connection part 4 ... Outer insertion pipe 41 ... Insertion part 42 ... Saddle part 5 ... Outer pipe 51 ... Connection part 52 ... Abutting step portion 53 ... Locking piece 6 ... Screw member 61 ... Nut portion (screw portion) 64 ... Abutting step portion 7 ... Reinforcement pipe 8 ... Seal member 81, 82 ... Seal member 10 ... Branch pipe 15 ... Tube

Claims (2)

[Scope of utility model registration request] 1. A connection structure of a pipe body and a branch connection pipe joint for branch-connecting a branch pipe to a peripheral wall of the pipe body, wherein the branch connection pipe joint is provided in a branch hole formed in the pipe body. A flexible inner tube having a locking projection that can be locked and a flange portion that can tightly contact a seal member between the inner hole and the inner peripheral edge of the branch hole, and an insertion that allows the inner tube to be loosely inserted. Portion and an outer insertion tube having a saddle portion curved at a base end portion of the insertion portion with a radius of curvature smaller than a radius of curvature of a pipe outer periphery of the pipe body, and locked to a flange portion of the inner pipe. An outer tube having an abutment step portion against which an end portion of the insertion portion of the outer insertion tube abuts, and an inner tube at an outer peripheral edge portion of a branch hole formed at an appropriate position on the peripheral wall of the tubular body. Is locked in a state of protruding outward, and a seal member is disposed at least at the flange portion of the inner pipe and the protruding end portion of the inner pipe, The outer pipe is inserted into the outer peripheral portion of the pipe, and the outer pipe is inserted into the inner peripheral portion of the inner pipe with the contact step portion of the outer pipe being in contact with the insertion end portion of the outer pipe. Is inserted, and the curvature of the saddle portion of the outer tube is changed so that the outer tube is abutted so as to substantially follow the outer circumference of the tube body. A connection structure for a branch connection pipe joint, characterized in that the inner pipe is brought into close contact with a branch hole via a seal member by being locked to the collar portion. 2. A connection structure of a pipe body and a branch connection pipe joint for branch-connecting a branch pipe to a peripheral wall of the pipe body, wherein the branch connection pipe joint is provided in a branch hole formed in the pipe body. An inner tube having a connectable connecting portion and a flange portion capable of closely contacting a seal member between the inner peripheral edge portion of the branch hole, an insertion portion into which the inner tube can be loosely inserted, and the insertion portion An outer insertion tube in which a saddle portion curved so as to substantially follow the outer circumference of the tubular body is formed at a base end portion, a threaded portion that can be screwed into the outer peripheral portion of the inner tube, and an insertion portion end of the outer insertion tube An outer peripheral edge portion of a branch hole formed at an appropriate position on the peripheral wall of the tubular body, the screwing member having an abutting step portion with which the portion abuts, and a reinforcing pipe that reinforces the connecting portion of the inner pipe. The inner pipe is locked in a state of protruding outward, and a seal member is disposed at least on the collar portion and the connecting portion of the inner pipe. While the reinforcing pipe is inserted and attached to the inner peripheral portion, the insertion portion of the outer insertion pipe is loosely inserted in the outer peripheral portion of the inner pipe, and the contact step portion of the screwing member is attached to the insertion end portion of the outer insertion pipe. In the state where the inner pipe is in contact with the inner pipe, a screw member is screwed onto the outer peripheral portion of the inner pipe, whereby the saddle portion of the outer insertion pipe is substantially contacted with the outer periphery of the pipe body and the inner pipe is sealed. A connection structure for a branch connection pipe joint, wherein the connection structure is in close contact with the branch hole via a member.