JPH07277458A - Joining structure between pipes - Google Patents

Abstract

PURPOSE:To provide the joining structure between pipes which is constituted to be excellent in strength resistance and sealing ability for a comparatively simple executing work. CONSTITUTION:The joining structure between pipes comprises a joint sleeve 3 fitted in a state to span a joint 2A between the end parts of pipes 2 and 2 having the same diameter as each other and having an inside diameter larger than the outer diameter of the pipe; a plurality of bolts mounted on the peripheral wall of the sleeve 3 and along an axial direction. The joining structure between pipes is provided with a plurality of push bolts 5 and 5... to press the outer walls of the pipes 2 and 2 against an inner wall on the opposite side to a bolt mounting wall and fix the pipes 2 and 2 to the interior of the sleeve 3; and a pair of stopper rings 4 for a sleeve arranged in a state to be partially fitted in the respective two end parts of the sleeve 3 between the pipes 2 and 2 and brought into contact with the respective inner walls 2A and 2A of the two end parts formed in a taper-form manner to regulate movement in the axial direction of a pipe of the sleeve 3. Further, the joining structure comprises a sealant 6 which is injected through an injection nozzle 7 formed in the taper-form inner wall 3A position of the end part of the sleeve 3 and with which a gap between the inner peripheral wall 3A of the sleeve 3 and the outer peripheral wall of the pipe 2 is filled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint structure, and more particularly, to a pipe joint structure which is easy to construct when joining pipes and is resistant to leakage.

[0002]

2. Description of the Related Art Generally, pipes are joined to each other by welding in a state where the ends of the pipes are butted against each other, or by forming one end of the joined pipe to have an enlarged diameter. It has been proposed to insert the end portion of another pipe into the expanded diameter end portion and fill the insertion portion with a sealing material or the like. However, welding of pipes is not easy to carry out, and preparation is not easy because of on-site welding. Further, as a general problem of butt joining of pipes, positioning at the time of butting is not easily determined.
Furthermore, it is not easy to inspect for leaks and the like, and once they are welded, their disassembly is not easy. In addition, a part of the joint pipe is inserted, the sealing property is insufficient and the strength resistance due to the environment is poor.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a joint structure for pipes which is excellent in strength resistance and sealability in spite of relatively simple construction work.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to a pipe joining structure in which end portions of pipes having the same diameter are butted and joined to each other. A joint sleeve having an inner diameter larger than the outer diameter of the pipe, and a plurality of bolts mounted on the peripheral wall of the sleeve and along the axial direction of the joint sleeve, the outer wall of each pipe being an inner wall opposite to the bolt mounting wall. A plurality of push bolts for pressing the pipes to fix the respective pipes in the sleeve, and the both end portions which are partially inserted between the respective end portions of the sleeve and the respective pipes and which are formed in a tapered shape. A pair of sleeve stopper rings that respectively abut against the inner wall to restrict the movement of the sleeve in the axial direction of the sleeve, and an injection hole formed in a tapered inner wall position at the end of the sleeve. By providing a structure for joining pipes, characterized in that it consists of a filled sealant between the inner wall and the outer peripheral wall of the pipe sleeve, in which to achieve the above objects.

[0005]

With the end portions of the pipes fitted in the joint sleeves, the outer walls of the pipes are pressed against the inner wall opposite to the bolt mounting wall by screwing the push bolts. In this case, the abutting end faces of the pipes are in the sleeve and abut each other accurately and easily by the action of the push bolt.

Further, the sleeve sput-up ring restricts the movement of the sleeve in the axial direction of the sleeve by coming into contact with the inner wall surface of the taper at the end of the sleeve, so that the sleeve and the respective pipes are in the axial direction and in the circumferential direction by a push bolt. It is fixed so that it will not slip. For this reason, the filled and solidified seal material maintains some adhesion and sealing property between the inner wall of the sleeve and the outer wall of the pipe over time, although some mechanical stress is applied due to expansion and contraction of the pipe due to temperature change. .

Further, the sealing material is generally press-fitted and filled from an injection hole formed at a tapered inner wall position, but the sealing material moves smoothly along the tapered inner wall because the stupalling functions as a weir during filling. 1 and 2 described later
In order to show the effect of the push bolt, the distance between the inner wall of the sleeve and the outer wall of the pipe is emphasized, but in reality, the gap is about 3 mm except for the tapered inner wall. ). Therefore, at the time of filling, the sealing material is solidified in such a state that it is completely distributed between the inner peripheral wall of the sleeve and the outer peripheral wall of the pipe. Therefore, the structure is such that the sealing property of the sealing material is accurately achieved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pipe joint structure according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view taken along the pipe axial direction of a pipe joint structure according to this embodiment. FIG. 2 is a cross-sectional view taken along the line II of FIG. Figure 3
FIG. 4 is an exploded cross-sectional view of the pipe joint structure according to the present embodiment.

As shown in FIGS. 1 to 3, a pipe joint structure 1 according to this embodiment is a structure in which end portions of pipes 2 and 2 having the same diameter are butted against each other. The pipe joint structure 1 is fitted over the joint portion 2A between the ends of the pipes 2 and 2, and has a joint sleeve 3 having an inner diameter larger than the pipe outer diameter, and a peripheral wall of the sleeve 3 and its shaft. A plurality of bolts mounted along the direction, the plurality of push bolts 5, which press the outer wall of each pipe 2, 2 against the inner wall opposite to the bolt mounting wall to fix each pipe 2, 2 in the sleeve 3, .. and the pipes of the sleeve 3 by abutting on the inner walls 2A, 2A of the both ends which are partially inserted between the respective ends of the sleeve 3 and the respective pipes 2, 2 and formed in a tapered shape. It is injected through a pair of sleeve stopper rings 4 that regulate axial movement and an injection hole 7 formed at a position of the tapered inner wall 3A at the end of the sleeve 3, and the inner peripheral wall 3A of the sleeve 3 and the outer periphery of the pipe 2. Filling between walls Consisting of the sealing material 6.

The pipe joint structure 1 of the present embodiment will be further described. As shown in FIGS. 1 to 3, the ends of the pipes 2 and 2 are butted and joined in a joint sleeve 3.
The outer diameter of the pipe 2 is formed smaller than the inner diameter of the sleeve 3, and the difference between the inner diameter and the outer diameter depends on the thickness of the sleeve and the outer diameter of the pipe to be joined, but the inner wall of the sleeve 3 and the outer wall of the pipe 2 differ. In this range, a large amount of the sealing material 6 does not leak between the stopper ring 4 and the pipe 2, and the pipe 2 can be easily fitted and inserted at the time of construction.
That is, at the time of injecting the sealing material 6 which will be described later, the sealing material 6 smoothly moves to the entire circumference through the tapered inner wall 3A of the sleeve 3 as a passage, and the gap between them is suppressed to the utmost. 1 and 2, the difference between the inner diameter and the outer diameter is emphasized in order to show the effect of the push bolt 5 described later.

The joint sleeve 3 is provided with a plurality of push bolts 5, 5, ... On its peripheral wall and along its axial direction. In this embodiment, the push bolts 5, 5, ... Are provided through screwing holes 3B formed along the axial direction of the peripheral wall of the zenith of the sleeve 3. Screw hole 3 for push bolt 5
By the threaded insertion into B, the outer wall of each pipe 2, 2 is pressed against the inner wall on the opposite side of the push bolt mounting wall, and each pipe 2,
2 is fixed. At least one push bolt 5 is required for each pipe 2, and preferably two or more push bolts 5 are provided.

Further, in this embodiment, in addition to the push bolt 5 for the zenith of the sleeve 3, auxiliary push bolts 5, 5, ... Deviated from the zenith in the circumferential direction by a predetermined angle P are provided.
Further, the shift angle P of the auxiliary push bolt 5 in the circumferential direction is 4
It is preferably 5 ° or less. With such an auxiliary push bolt 5, the pipe 2 and the sleeve 3 are securely fixed to each other in the circumferential direction, and the joint end surface 2A between the pipes 2 and 2 shows a correct fit and is in such a state. Is maintained for a long time.

Inner walls 3A at both ends of the joint sleeve 3 are formed in a tapered shape, and serve as an abutting portion of the above-mentioned sleeve stopper ring 4 and a running passage in the circumferential direction when the sealing material 6 is filled. Therefore, an injection hole 7 for the sealing material 6 is formed at the position of the inner wall 3A. The sealing material 6 is fluid at the time of injection and then solidifies to exhibit sealing properties. As the sealing material 6, a known material can be used.

A pair of sleeve stopper rings 4, 4
Is inserted into each pipe 2 in advance before the joint seal 3 is attached. After the joint seal 3 is fixed by the push bolt 5, the set bolt 10 is screwed into the attachment hole 9 and fixed to the pipe 2. Alternatively, the reverse procedure may be performed. The stopper ring 4 is formed to have substantially the same diameter as that of the sleeve 3, and a part of the end of the stopper ring 4 is notched in a tapered shape so as to be inserted into the sleeve 3.

Next, the assembly of the pipe joint structure 1 will be described. First, the pipes 2, 2 to be joined are inserted into the joint sleeve 3, and the end faces of the respective pipes 2 are butted in a rough state. .. are screwed into the screwing holes 3B of the sleeve 3 to eccentrically center the pipe 2 from the center of the sleeve 3, and the pipes 2 are
And the pipes 2 and 2 are accurately butted and joined together.

After the tightening of the push bolt 5 is completed, the stopper rings 4 are attached to both ends of the sleeve 3, and the stopper bolt 1 is attached.
Fixed through 0. As a result, the movement of the sleeve 3 in the axial direction of the pipe 2 is completely restricted. And then,
The sealing material 6 in a fluid state is press-fitted from the injection hole 7. In this case, although some sealing material 6 leaks out from between the inner wall of the sleeve 3 or the inner wall of the stopper ring 4 and the outer wall of the pipe 2, the sealing material 6 spreads in the entire circumferential direction using the tapered inner wall 3A as a passage. . Therefore, when the sealing material 6 is solidified, the inner peripheral wall of the sleeve 3 and the outer peripheral wall of the pipe 2 are completely sealed.

[0017]

EFFECTS OF THE INVENTION The pipe joint structure according to the present invention can be excellent in strength resistance and sealability in spite of relatively simple construction work.

[Brief description of drawings]

FIG. 1 is a cross-sectional view in a pipe axial direction of a pipe joining structure according to an embodiment.

FIG. 2 is a cross-sectional view taken along the line II of FIG.

FIG. 3 is an exploded cross-sectional view of a pipe joint structure according to the present embodiment.

[Explanation of symbols]

 1 Pipe joint structure 2 Pipe 3 Joint sleeve 3A Tapered inner wall 4 Stopper ring for sleeve 5 Push bolt 6 Sealing material 7 Pouring hole

Claims (2)

[Claims] 1. A pipe joining structure for joining end portions of pipes of the same diameter by butting each other, wherein the pipes are fitted over the joint portions of the end portions of the pipe and have a diameter larger than the outer diameter of the pipe. A joint sleeve having an inner diameter, and a plurality of bolts mounted on the peripheral wall of the sleeve and along the axial direction thereof, wherein the outer wall of each pipe is pressed against the inner wall opposite to the bolt mounting wall to fix the pipe. A plurality of push bolts fixed in the sleeve, and abutting on the inner walls of both ends of the sleeve, which are partially fitted between the both ends of the sleeve and each of the pipes and are tapered, respectively. And a pair of sleeve stopper rings for restricting the movement of the sleeve in the axial direction of the pipe, and an injection hole formed in a tapered inner wall position of the end portion of the sleeve, and the inner peripheral wall of the sleeve and the sleeve. Joint structure of a pipe, characterized in that it consists of a filled sealant between the outer peripheral wall of the type. 2. In addition to the push bolts provided on the peripheral wall of the sleeve and along the axial direction thereof, auxiliary push bolts are provided on the peripheral wall within an angle of 45 ° from the peripheral wall. The joint structure for pipes according to claim 1.