JPH05240381A - Pipe joint structure - Google Patents

Abstract

PURPOSE:To improve jointing workability in a pipe joint structure which joints an existing pipe and a newly installed pipe such in a city water pipe and the like, by installing a fixing member at the inner periphery of a ring-shaped member which is fitted onto the existing pipe through a coming-off preventing member so as to travel freely. CONSTITUTION:When a newly installed pipe 2 such as a branch pipe is jointed with an existing pipe 1, the cut end part of the existing pipe 1 is inserted in the receiving port 3 which is formed at the new pipe 2, and a welded ring- shaped member 5 which is fitted onto the pipe outside edge surface of the existing pipe 1 and a flange of the receiving port 3 are connected with plural bolts 7 by pressing in a packing 6. Next, the fixing member 9 which is fitted at recessed parts 10 formed at the plural parts of the inner periphery of the ring-shaped member 5 is moved inwards in a radial direction by tightening the pressing-in bolt 8 which is screwed in the ring shaped member 5 to make the fixing member come into pressure contact with the outer periphery 4 of the pipe to connect the existing pipe 1 and the new pipe 2 in a water-sealing condition. The fixing member 9 is locked at a blot 8 through a coming-off preventing member 12 to prevent it from coming-off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an annular member externally fitted to the outer peripheral surface of a pipe, a recessed portion formed on the inner peripheral surface of the annular member, and a radially inward movable portion to the recessed portion. Also, a plurality of fixing members that are fitted in a rotation preventing state, a drop-off preventing member that prevents the fixing member from falling off the recessed portion, an outer peripheral surface side of the annular member and an inner peripheral surface side of the recessed portion. And a screw shaft screwed in a state of penetrating over
The present invention relates to a pipe joint structure in which the fixing member is pushed radially inward by a screwing operation of the screw shaft and is pressed against the outer peripheral surface of the pipe, and the annular member is fixed to the outer peripheral surface of the pipe.

[0002]

2. Description of the Related Art The above-mentioned pipe joint structure has a plurality of fixing members arranged in the circumferential direction of an annular member for screwing a screw shaft when connecting and fixing a branch pipe or a valve to a pipe end or the like. The annular member is fixed to the outer peripheral surface of the pipe by pressure contact with the outer peripheral surface of the pipe by operation, and the branch pipe, the valve, etc. are fixed to the pipe end portion through the annular member. In order to prevent the fixing member fitted into the recessed portion when it is externally fitted to the surface from falling off from the recessed portion, a retaining member for preventing the fixing member from falling off the recessed portion is provided. An elastic member as a fall-off preventing member is press-fitted between the recessed portion and the fixing member to prevent the fixing member from falling out of the recessed portion, so that the annular member has an outer peripheral surface side and an inner peripheral surface side of the recessed portion. By the screwing operation of the screw shaft that is screwed in the state of penetrating over, the fixing member is pressed against the elastic force of the elastic member, Those adapted for pressing the fixing member to the tube outer peripheral surface (e.g., Japanese Utility Model see JP 62-133080) it is.

[0003]

According to the above prior art, the screw shaft for pushing the fixing member toward the outer peripheral surface of the pipe penetrates the outer peripheral surface of the annular member and the inner peripheral surface of the recess. Since it is screwed in the state where it is screwed, if the amount of protrusion of the screw shaft from the outer peripheral surface of the annular member is visually checked, whether the screw shaft is forcibly screwed or not, and the fixed position of the annular member in the radial direction of the pipe outer peripheral surface Although there is an advantage that it is possible to easily check, for example, the elastic member as a fall-off preventing member is press-fitted between the recessed portion and the fixing member to prevent the fixing member from falling out of the recessed portion. It takes a great deal of labor to press-fit the fixing member, and even when the fixing member is brought into pressure contact, it is necessary to screw the screw shaft against the elastic force of the elastic member. There is a drawback that the work of fixing to the surface requires a lot of trouble and labor. The present invention has been made in view of the above circumstances, and by devising the structure of the fall-off prevention member, the amount of protrusion of the screw shaft from the outer peripheral surface of the annular member indicates whether or not the screwing operation of the screw shaft is forgotten. An object of the present invention is to provide a pipe joint structure capable of easily assembling a fixing member and fixing work to an outer peripheral surface of a pipe while taking advantage of an advantage that a fixed posture of the annular member to the outer peripheral surface of the pipe can be easily checked.

[0004]

The characteristic construction of the present invention for achieving the above object is to provide a screw shaft in which the fall-off preventing member is protruded toward the inner peripheral surface side of the recess in the pipe joint structure described above. And a locking portion to be locked to the fixing member are integrally provided, and the locking member is fixed to the fall-off preventing member by a screwing operation of the screw shaft. There is a rotation permitting mechanism for permitting the rotation of the screw shaft with respect to the fixing member when the working member is pushed out, and the following operational effects are obtained from this configuration.

[0005]

[Operation] The locking portion is locked to the fixing member to connect the drop-preventing member and the fixing member, and the fixing member is fitted into the recessed portion with the locking piece of the drop-preventing member facing the screw shaft. Then, the locking piece is locked to the screw thread of the screw shaft by the screwing operation of the screw shaft, or the locking piece is engaged with the screw thread of the screw shaft that is previously projected to the inner peripheral surface side of the recessed portion. By stopping, the fixing member is connected to the screw shaft via the drop-preventing member, and the fixing member is prevented from dropping from the recessed portion. Then, even when the annular member in which the fixing member is prevented from falling off is externally fitted to the outer peripheral surface of the pipe and the screw shaft is screwed, the fixing member is fitted into the recessed portion in a rotation-stop state, Moreover, since the locking piece of the drop-off prevention member is engaged with the thread of the screw shaft, there is a risk that the screw shaft will not rotate when the tip of the screw shaft is in contact with the fixing member side. When the fixing member is pushed out by the screwing operation of the screw shaft, a rotation permitting mechanism that allows the screw shaft to rotate with respect to the fixing member is provided. The ring-shaped member is pushed inward in the direction and pressed against the outer peripheral surface of the pipe, and the annular member is fixed to the outer peripheral surface of the pipe.

[0006]

Therefore, while utilizing the advantage that the amount of protrusion of the screw shaft from the outer peripheral surface of the annular member can be easily checked, such as whether or not the screw shaft is forcibly advanced, and the fixed posture of the annular member with respect to the outer peripheral surface of the pipe, Since the fall prevention member that engages with both the fixing member and the screw shaft to prevent the fixing member from falling out of the recessed portion is incorporated, the fixing member can be assembled and fixed to the outer peripheral surface of the pipe. It can be done easily.

[0007]

【Example】

[First Embodiment] FIG. 6 shows a pipe joint structure for connecting an existing pipe 1 such as a water pipe buried in the ground and a new pipe 2 such as a branch pipe. The existing pipe 1 formed in the new pipe 2 is shown in FIG. The flange 5a of the cast iron annular member 5 fitted into the outer peripheral surface 4 of the existing pipe 1 by inserting the cut end of the existing pipe 1 into the receiving port 3 having a diameter larger than the outer diameter of the existing pipe 1.
And the flange 3a connected to the receiving portion 3
The packing 6 attached to the above is pushed between the receiving portion 3 and the outer peripheral surface 4 of the existing pipe 1 at the end surface of the annular member 5, and is connected by a plurality of bolts 7 having a T-shaped head. After that, the annular member 5 is fixed to the pipe outer peripheral surface 4, and the existing pipe 1 and the new pipe 2 are connected and connected in a watertight state. As shown in FIGS. 2 to 5, the annular member 5 causes the claw 9a formed on the cast iron fixing member 9 to bite into the pipe outer peripheral surface 4 by the screwing operation of the push-in bolt 8. Is fixed so as not to slip out, and a plurality of recessed portions 10 are formed on the inner peripheral surface of the annular member 5 at intervals in the circumferential direction, and each of the recessed portions 10 has a fixing member 9 radially inward. Can be moved to
In addition, the push-in bolt 8 is screwed in such a state that the push-in bolt 8 is screwed in a state in which it is fitted in a non-rotating state and penetrates both the outer peripheral surface side of the annular member 5 and the inner peripheral surface side of the recessed portion 10 and is screwed. The bolt 8 pushes the fixing member 9 inward in the radial direction and presses it against the outer peripheral surface 4 of the pipe, and the claw 9a of the fixing member 9
Are configured so as to bite into the outer peripheral surface 4 of the pipe and be fixed. Abutment surface 1 of the fixing member 9 with the push-in bolt 8
1 is the outer peripheral surface 4 of the existing pipe 1 as the distance from the new pipe 2 increases.
When the existing pipe 1 and the new pipe 2 are formed in a tapered surface that approaches the
The fixing member 9 is brought into contact with the pressing bolt 8 and the contact surface 11.
Is further configured to generate a press contact force for pressing the pipe outer peripheral surface 4 against the pipe outer peripheral surface 4 to effectively prevent relative movement thereof.

When the annular member 5 is fitted onto the outer peripheral surface 4 of the pipe, the fixing member 9 fitted in the concave portion 10 does not fall off from the concave portion 10, so that the concave portion 10 of each fixing member 9 is prevented.
A fall prevention member 12 that is integrally formed of a resin such as polypropylene or rubber that prevents the fall off from the inside is incorporated. As shown in FIGS. 1 (a) and 1 (b), the drop-off preventing member 12 has a cylindrical socket portion 13 into which a push-in bolt 8 protruding toward the inner peripheral surface of the recessed portion 10 is inserted from the axial center direction thereof. And a thread 14 of a female screw screwed into the push-in bolt 8 as a locking piece to be locked by the thread 8a of the push-in bolt 8 inserted into the socket portion 13, and the fixing member 9. The fixing member 9 is slidably moved along the dovetail groove 15 and the side surface 9b of the fixing member 9, and the fixing member 9 is brought into contact with the side surface 9b. 17 and a tongue piece 18 that is held in a state of being pressed against the socket 17 are integrally provided. Notches 19 are formed in the socket portion 13 at intervals in the circumferential direction. Of the push-in bolt 8 from the state of being in contact with the contact surface 11. When the fixing member 9 is pushed out by the advancing operation, the socket portion 13 is elastically deformed in the radial direction and the thread 14 of the female screw is disengaged from the thread 8a of the push-in bolt 8, and the push-in bolt 8 is fixed to the fixing member 9. A rotation permitting mechanism that permits rotation is configured.

Then, as shown in FIG. 2, when the annular member 5 is externally fitted to the existing pipe 1, the locking portion 16 is previously engaged with the dovetail groove 15 of the fixing member 9 to serve as the fall prevention member 12. The fixing member 9 is inserted into the recessed portion 10 together with the drop-off prevention member 12 in a posture in which the fixing member 9 is connected and the socket portion 13 is pushed toward the tip side of the bolt 8, and the pushing bolt 8 is inserted into the socket portion 13. However, the push-in bolt 8 is formed in the socket portion 13 by screwing the tip until it comes into contact with the contact surface 11 of the fixing member 9 or by previously projecting the push-in bolt 8 to the inner peripheral surface side of the recessed portion 10. Female thread 1
While elastically displacing 4, the female screw of the drop-off preventing member 12 is obtained by forcibly inserting the fixing member 9 into the recessed portion 10 until the tip of the elastic member 4 comes into contact with the fixing member 9. The screw thread 14 is locked to the screw thread 8a of the push-in bolt 8 to prevent the fixing member 9 from falling off the recess 10. When the annular member 5 in which the fixing member 9 is prevented from falling off is externally fitted to the pipe outer peripheral surface 4 and the push-in bolt 8 is further screwed, the push-in bolt 8
The screw thread 8a of the screw rotates while engaging with and disengages from the screw thread 14 of the female screw to push out the fixing member 9,
Is pressed against the pipe outer peripheral surface 4, the claw 9a bites into the pipe outer peripheral surface 4, and the annular member 5 is fixed to the pipe outer peripheral surface 4.

[Second Embodiment] FIG. 7 shows a fall prevention member 12
Another embodiment of the present invention is shown, in which the socket portion 13 made of resin or rubber is used.
A plurality of elongated holes 20 are formed along the circumferential direction on the base side of the to form a weak weak portion, and the tip of the push-in bolt 8 abuts against the abutment surface 11 of the fixing member 9 from the abutment side. When the bolt 8 is further screwed, the push-in bolt 8
Rotation in which the socket portion 13 is screwed off at the fragile portion while being screwed into the thread 14 of the female screw formed in the socket portion 13, and the rotation of the push-in bolt 8 with respect to the fixing member 9 is allowed. An allowance mechanism is configured. Other configurations are similar to those of the first embodiment.

Other Embodiments The annular member fitted to the outer peripheral surface of the pipe is configured by connecting arc-shaped members divided into a plurality in the circumferential direction along the outer peripheral surface of the pipe. May be. The annular member fitted to the outer peripheral surface of the pipe may be integrally provided in the branch pipe main body, the valve main body, or the like. The material of the fall prevention member is not particularly limited, and may be metal or a combination of metal and resin or rubber. In this case, for example, when the socket portion is formed of metal in the first embodiment and the push-in bolt screwed or forcibly inserted until the tip comes into contact with the fixing member is further screwed, the socket portion is Is elastically or plastically deformed so that the screw thread of the push-in bolt rotates while engaging and disengaging with respect to the screw thread of the female screw, and the fixing member is pushed out. In the second embodiment, the socket portion is made thin. It may be possible to implement it by forming it with a metal. The locking piece provided on the fall-off preventing member is not limited to the one integrally formed on the inner peripheral surface of the socket portion, but may be provided separately from the socket portion and implemented. The locking piece provided on the fall-out prevention member is not limited to the one formed in the shape of the female screw thread that is screwed into the screw thread of the screw shaft, but can be substantially locked to the screw thread of the screw shaft. Alternatively, it may have a function. For example, the inner peripheral surface of the cylinder that is inserted between the threads of the screw shaft by screwing the screw shaft into the cylinder formed of an elastic material such as soft resin or rubber while elastically deforming the cylinder in the radial direction. May substantially function as a locking piece. In this case, the peripheral surface of the cylinder is elastically deformed in accordance with the rotation operation of the screw shaft, thereby forming a rotation allowance mechanism that allows the screw shaft to rotate with respect to the fixing member. The locking portion of the fall prevention member locked to the fixing member is
The fixing member is not limited to the one that is locked in the dovetail groove formed in the fixing member, and may be, for example, one that is locked in a deep hole formed in the fixing member or that holds the fixing member. It may be stopped. In the embodiment, the shape of the socket portion is not limited to the cylindrical shape, and may be configured by arranging the rectangular tubular shape or the columnar body in an annular shape as long as the posture of the fixing member can be regulated. In the second embodiment, the fragile portion may be formed by forming the base side portion of the socket portion thinner than the other portions, instead of the plurality of long holes formed to form the fragile portion.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1A is an exploded perspective view of a main part, and FIG. 1B is an assembly view of the main part.

FIG. 2 is a vertical cross-sectional view of the main part

FIG. 3 is a vertical cross-sectional view of a main part showing a pipe joint structure.

4 is a view taken along the line IV-IV in FIG.

FIG. 5 is a front view of an annular member.

FIG. 6 is a vertical cross-sectional view of a main part showing a pipe joint structure.

FIG. 7 is a perspective view showing another embodiment of the fall prevention member.

[Explanation of symbols]

 4 Pipe outer peripheral surface 5 Annular member 8 Screw shaft 8a Screw thread 9 Fixing member 10 Recessed portion 12 Fall-out prevention member 13 Socket portion 14 Locking piece 16 Locking portion

Claims (1)

[Claims] 1. An annular member (5) externally fitted to a pipe outer peripheral surface (4), a recessed portion (10) formed on an inner peripheral surface of the annular member (5), and the recessed portion (10). A plurality of fixing members (9) that are movable inward in the radial direction and that are fitted in a non-rotating state, and a fall-off preventing member that prevents the fixing member (9) from falling out of the recess (10). (12)
And the outer peripheral surface side of the annular member (5) and the recessed portion (1
0) and a screw shaft (8) which is screwed in a state of penetrating the inner peripheral surface of the fixing member (9) in a radial direction by screwing operation of the screw shaft (8). A pipe joint structure in which the annular member (5) is pushed inward and pressed against the pipe outer peripheral surface (4), and the annular member (5) is fixed to the pipe outer peripheral surface (4),
The retaining piece (14) for retaining the drop-off prevention member (12) on the thread (8a) of the screw shaft (8) protruding toward the inner peripheral surface of the recessed portion (10), and the fixing. The locking member (16) to be locked to the working member (9) is integrally provided, and the fixing member (12) is fixed to the fall prevention member (12) by the screwing operation of the screw shaft (8). A pipe joint structure characterized in that a rotation permitting mechanism for permitting rotation of the screw shaft (8) with respect to the fixing member (9) at the time of pushing out 9) is provided.