JPH09280441A - Pipe connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a separation preventing function for a thrust load at the time of an earthquake in a pipe connection structure in which metal fittings which are respectively embracingly fixed to the pipe end of an insert opening side and a receiving opening by a tension resistance member, by arranging the tension resistance member in such a manner that it can be extended and shrunk in the direction of a pipe shaft and can be vertically bent in the direction of the pipe shaft. SOLUTION: A rubber ring mounting groove is formed in a receiving opening (b), and the insert opening (a) of one pipe end is inserted to the receiving opening (b). A metal fitting A is embracingly fixed to the periphery of the pipe end of an insert opening (a) side, and a metal fitting B is embracingly fixed to a receiving opening (b) side, then both metal fittings A, B are connected to each other through a connecting rod 1. This connecting rod 1 comprises connecting rod pieces 1a, 1b respectively locked in the metal fittings A, B, a T-shaped head locked in the locking hole of the connecting rod 1 of the metal fitting A is arranged at one end of the connecting rod piece 1a, and a bifurcated parallel part 13a is formed at the other end thereof. While, the connecting rod piece 1b has a hook-shaped head 12b at one end, and this hook-shaped head 12b is equipped with a guide 121b and a stopper 122b, thereby the guide 121b is slidably received in the oblong hole of the bifurcated parallel part 13a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting structure provided with a separation preventing mechanism.

[0002]

2. Description of the Related Art For connecting pipes, a structure is generally used in which a receiving port is formed at one end of the pipe and the insertion port of one tube is inserted into the receiving port of the other tube via a rubber ring. Since this pipe connection structure has flexibility, it is advantageous for uneven settlement of the ground. However, when a tensile force in the axial direction of the pipe is applied, there is a fear of detachment, and there is a problem with respect to a high thrust load under high pressure.

Therefore, when it is used for high internal pressure, metal fittings are respectively attached and fixed to the outer peripheral surface of the pipe end portion on the insertion side and the outer peripheral surface of the receiving opening, and these metal fittings are connected by a connecting rod. It is known that the thrust load is supported by means of the above to prevent separation.

[0004]

In the conventional separation prevention structure, it is possible to bend in one direction to some extent so as to ensure the flexibility against the uneven settlement. However, in the event of a large earthquake in the Hanshin-Awaji Earthquake class, for example, in the case of a pipe with a diameter of about 100 mmφ, about ± 75 mm in the pipe axial direction between the connected pipes (± 1 to 1. +/- 8 in the pipe circumferential direction with movement of about 5%)
Although a rotational movement of about ° occurs, the conventional separation prevention structure acts as a rigid body against these tube movements, and a large reaction force cannot be avoided. That is, in order to prevent the circumferential movement between the connected pipes from being restricted by the separation prevention structure, the pipe axis direction is set to the X axis direction, and the bending from the X axis to the Y axis and the bending from the X axis to the Z axis are performed. However, in the conventional separation prevention structure, only a certain degree of bending is possible in one direction,
It is easy to destroy by generating a large reaction force, and it is difficult to guarantee earthquake resistance. Therefore, after a large earthquake, it is difficult to guarantee the separation prevention function against thrust load.

An object of the present invention is to easily impart seismic resistance to a separation preventing mechanism at a connecting portion of a pipe, and to sufficiently perform a separation preventing function against a thrust load even after an earthquake.

[0006]

In the pipe connection structure according to the present invention, the insertion port of one pipe is inserted into the receiving port of the other pipe via a rubber ring, and the pipe end portion on the insertion side and the receiving port are inserted. In the pipe connecting structure in which the metal fittings are respectively bound and fastened to each other and the metal fittings are connected by the tension resistant members,
Is stretchable or slidable in the tube axis direction, and is bendable toward both axes perpendicular to the tube axis direction and orthogonal to each other.

In this structure, the tensile strength member is
One of the metal fittings has one end locked to the other end of the base, and the bifurcated parallel portion has a long rod-shaped connecting rod piece and the bifurcated parallel portion parallel to each other. At the tip of the main body having a thickness passed through the gap, there is a hook-shaped head slidably fitted to both long ring-shaped pieces of the same or two parallel parts, and the other end is locked to the other metal fitting. A connecting rod consisting of a connecting rod piece can be used,
Further, the metal fitting on the receiving side is a two-split body which is engaged with the shoulder on the outer surface of the receiving opening, and the ears of each divided piece are overlapped at the cracked portion, and a tension-resistant member is attached to these ears. An insertion hole at the other end of a connecting rod and a slit for introducing the other end of the connecting rod from the outside into the insertion hole are used. It is possible to provide a collar that abuts against.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1A is a plan view showing an example of the pipe connection structure according to the present invention, and FIG. 1B is a side view of the same. In (a) and (b) of FIG. 1, a indicates an insertion port of one pipe end, b indicates a receiving end of the other pipe end, and the receiving port b has a rubber ring mounting groove. Then
The insertion port a at one end of the tube is inserted into the receiving port b via a rubber ring. A is a metal fitting that is fixed to the outer periphery of the pipe end on the insertion side, B is a metal fitting that is fixed to the receiving side, and 1 is a connecting rod in which both metal fittings are connected. A movable part C is provided for following the movement of the tubes in the tube axis direction and the tube circumferential direction. That is, if the tube axis direction is the X-axis direction, it can be expanded and contracted in the X-axis direction.
A movable portion C capable of bending movement from the axis to the Y axis and bending movement from the X axis to the Z axis is provided.

FIG. 2A is a side view of the insertion-side fitting A, and FIG. 2B is a front view showing a right half section in section. In FIG. 2A and FIG. 2B, 21a
Is an upper metal piece and has ears 211a and 211a at both ends. 22a is a piece of lower metal fitting, which has ears 221 on both ends.
a, 221a. A screw groove is formed on the inner peripheral surface of each of the metal fitting pieces 21a and 22b for engagement. 23
are protrusions provided to maintain a constant distance between the ears of both metal fittings, 24a is a bolt hole formed in the ears, and 25a is a bolt provided on the outer surface of one of the ears. A head fitting frame (around the bolt), 26a is a connecting rod locking hole formed in the ear portion.

FIG. 3A is a front view of the socket-side fitting B. This metal fitting has a configuration in which two metal fitting pieces 21b shown in FIG. 3B (front view) and FIG. 3C (plan view) are rotated by 180 ° in the same plane to form a set. A taper surface 25b is provided which is locked to the shoulder on the outer surface of the receptacle. 3B and 3C, 211b and 211b are double ears provided at one end of the metal fitting piece 21b, and 212b is a single ear provided at the other end of the metal fitting piece 21b. The portion is provided with a connecting rod insertion hole 23b and a slit 24b having a gap slightly narrower than this hole diameter.

In FIG. 3 (a), at the cracked portion of the metal fitting B, the single ear portion 212b of the other metal fitting piece is received in the gap between the double ears 211b of the one metal fitting piece and the ears are overlapped. . 1 (a) and 1 (b), the connecting rod 1
Is composed of a connecting rod piece 1a locked to the insertion side metal fitting A and a connecting rod piece 1b locked to the receiving side metal fitting B.

FIG. 4A is a plan view of the connecting rod piece 1a, and FIG. 4B is a side view of the same. In (a) of FIG. 4 and (b) of FIG. 4, 11a is a base, and at one end,
A T-shaped head 12a is provided which is locked in the connecting rod locking hole 26a of the ear of the insertion side metal fitting A. 13a, 1
Reference numeral 3a denotes a bifurcated parallel portion provided at the other end of the base portion 11a. Each bifurcated piece has a long ring shape, and its cross section has a rectangular shape.

FIG. 5A is a plan view of the connecting rod piece 1b, and FIG. 5B is a side view of the same. 5C and FIG. 5D are a sectional view taken along the line Ha and a sectional view taken along the line II in FIG. In FIG. 5, 11b is a main body, the outer diameter of which is the forked parallel portions 13a, 1 of the connecting rod piece 1a.
It is made smaller than the gap h of 3a. Reference numeral 12b denotes a hook-shaped head provided at one end of the main body portion 11b, which includes a guide portion 121b and a stopper portion 122b. As shown in FIG. 1, the guide portion 121b is a forked parallel portion 13a of the connecting rod piece 1a. 13a is slidably received in the long hole of the long ring-shaped piece, and the stopper portion 122b slidably contacts the outer surface of each long ring-shaped piece 13a (the sliding surface of the stopper is a curved surface. Exist).

In FIG. 5, reference numeral 13b denotes a locking portion for the socket-side fitting B, and the overlapping ear portion 211 of the fitting B shown in FIG.
The core portion 131b is introduced from the slit 24b of the b / 212b into the connecting rod insertion hole 23b of the same ear portion, and the flange portions 132b and 132b are in contact with both surfaces of the same ear portion.
The cross-sectional shape of 3b is an oblong shape, for example, an oval shape as shown in FIG. 5D, and the major axis length e of the cross section is the ear slit 24.
It is larger than the gap b, and the end axis length f is smaller than the thickness of the slit 24b.

In order to assemble the pipe connecting structure shown in FIGS. 1 (a) and 1 (b), the pipe insertion port a is inserted into the receiving port b via a rubber ring, and then the outer surface of the receiving port is attached. By embracing the metal piece of the metal fitting B on the shoulder and overlapping the ear of the metal fitting B,
As shown in FIG. 6, the locking core portion 131b of the connecting rod piece 1b of the connecting rod is introduced from the slit 24b of the ear into the connecting rod insertion hole 24b of the same ear, and after this introduction, the length of the cross section of the core portion is increased. The connecting rod piece 1b is rotated by 90 ° so that the axial direction is perpendicular to the slit direction. By this rotation, it is possible to prevent the locking portion core of the connecting rod piece 1b from escaping from the slit of the ear of the metal fitting B, and the brim portion of the locking portion sandwiches the ear portion of the metal fitting B so that the connecting rod piece b is attached to the metal fitting. The metal fitting B is locked to B and is attached to the shoulder of the socket.

The hook-shaped head at one end of the connecting rod piece b and the bifurcated parallel portion of the connecting rod piece a are movably connected as described above. As described above, if the socket-side fitting B is fixed to the socket b and the connecting rod piece 1b of the connecting rod is locked to the bracket B,
The upper and lower metal fitting pieces of the metal fitting A are joined to the pipe end on the side of the insertion opening a, and the T-shaped head at one end of the connecting rod piece 1a is housed in the locking hole of one ear of the metal fitting. Tighten with the bolts and nuts to bind and fix the insertion side metal fitting A to the insertion end side pipe end, and lock one end of the connecting rod piece 1a to the metal fitting A, so that the pipe connection structure shown in FIG. Finish the assembly work.

In FIG. 1, forward and backward movements of the connected pipes in the pipe axial direction are performed by the T-shaped head 12b of the connecting rod piece 1b with respect to the long ring-shaped piece 13a of the bifurcated parallel portion of the connecting rod piece 1a.
Can be freely generated within the range of the sliding stroke of
By setting the length of the long hole of the bifurcated parallel portion to about 150 to 160 mm, it is possible to easily ensure without increasing the size of the detachment prevention mechanism.

Further, in FIG. 1A, the connecting rod piece 1
It is possible to bend and move the connecting rod piece 1b in the m direction with substantially no resistance acting with the one end 12b of b as the fulcrum of rotation. That is, when the tube axis direction is the X axis direction, the connecting rod piece 1b can be bent and moved almost freely from the X axis to the Y axis. Further, in FIG. 1B, the distance h between the forked parallel portions 13a, 13a of the connecting rod piece 1a and the connecting rod piece 1
Bending movement of the connecting rod piece b from the X axis to the Z axis can be sufficiently increased by increasing the difference from the outer diameter d of the body portion 11b of b. Therefore, the pipe circumferential direction movement amount ± 8 ° between the connected pipes at the time of the large earthquake is determined by the distance h between the forked parallel portions of the connecting rod piece 1a to the outer diameter d of the main body portion of the connecting rod piece 1b. By making it relatively large (for example, when d is 13 mmφ, h is 22 mm), it can be easily assured without increasing the size of the detachment prevention mechanism.

Therefore, in the pipe connecting structure according to the present invention, the relative movement of the connected pipes during an earthquake can be restrained even though the separation preventing mechanism for the internal pressure thrust load is additionally provided. Instead, the acting force at the time of an earthquake can be absorbed by the relative movement between the receiving port and the inserting port via the rubber ring, and the detachment prevention mechanism can be destroyed by the action of a large reaction force or the pipe can be damaged. It can be prevented. Therefore, even after the occurrence of the earthquake, it is possible to satisfactorily prevent the internal pressure thrust load from being separated.

FIG. 7A is a plan view showing another example of the pipe connection structure according to the present invention, and FIG. 7B is a sectional view taken along the line RO in FIG. 7A. 7 (a) and FIG. 7 (b)
In, a is an insertion opening. A is an insertion-side metal fitting that is fixed to the insertion-side tube end portion by tying. It is composed of upper and lower metal fitting pieces, and vertically long ears 11 are provided at both ends of each metal fitting piece. The protrusions 111 and 111 maintain a constant space between the protrusions 11 and 11, and the ears of these are the bolts and nuts 1.
It is concluded at 12. Reference numeral 13 is a long hole provided in the ear portion. 1 is a connecting rod, and T-shaped headers-12 and 12 are provided at both ends.
The projection of the T-shaped header-12 at one end of the connecting rod is slidably received in the long hole 13 of the ear of the insertion side metal fitting A.

Reference numeral b is a receptacle, and B is a socket-side metal fitting B which is fixed to the socket by tying. The same as the above-mentioned socket-side bracket A, it has vertically long ears, and there is a protrusion between the ears. , The upper and lower ears are fastened with bolts and nuts, and the projection of the T-shaped header at the other end of the connecting rod is slidably received in the long hole of the ear of the socket B. ing. In this embodiment, the forward and backward movements of the connected pipes in the axial direction of the pipe freely occur within the range of the sliding stroke of the T-shaped heads at both ends of the connecting rod in the elongated holes of the ear of each metal fitting. Can be made. Also, with each end of the connecting rod serving as a fulcrum of rotation, bending movement can be performed from the tube axis direction (X axis direction) to the axis (Y axis) in one direction perpendicular to this axis direction without substantially acting. Further, by increasing the difference between the distance h between the upper and lower ears of each metal fitting and the outer diameter d of the connecting rod, the bending movement of the connecting rod from the X axis to the Z axis can be sufficiently increased. Therefore, it is possible to absorb the acting force at the time of the earthquake by the relative movement between the receiving port and the insertion port through the rubber ring without restraining the relative movement between the connected pipes at the time of the earthquake. Similarly to the above, even after the occurrence of the earthquake, the separation prevention against the internal pressure thrust load can be satisfactorily performed.

The present invention can be carried out in other embodiments than the above-mentioned embodiment. For example, the insertion side metal fitting A and the receiving side metal fitting B may be connected by a rope having a slack in the middle. It is possible.

[0023]

In the pipe connecting structure according to the present invention, although the disconnection preventing mechanism is additionally provided, it is possible to avoid the constraint of the pipe axial movement and the circumferential movement of the connected pipes. The elastic force of the rubber ring between the receiving port and insertion port can be effectively absorbed, and the detachment prevention mechanism and pipe damage during an earthquake can be well prevented, and the thrust is also provided by the detachment prevention mechanism during an earthquake. The load supporting action can be satisfactorily achieved.

[Brief description of drawings]

1 (a) is a plan view showing a pipe connection structure according to the present invention, and FIG. 1 (b) is a side view thereof.

FIG. 2 (a) is a side view showing an insertion-side holding metal fitting used in the present invention, and FIG. 2 (b) is a side view showing a right half thereof in section.

3 (A) is a front view showing a socket-side holding metal fitting used in the present invention, FIG. 3 (B) is a front view showing a metal fitting half piece of the metal fitting, and FIG. FIG. 7 is a plan view showing the metal fitting half piece.

4 (a) is a plan view showing an insertion-side connecting rod piece of a connecting rod used in the present invention, and FIG. 4 (b) is a side view thereof.

5 (a) is a plan view showing a socket-side connecting rod piece of a connecting rod used in the present invention, FIG. 5 (b) is a side view, FIG. 5 (c) and FIG. (D) is (b) in FIG.
FIG. 3 is a cross-sectional view and a cross-sectional view taken along line II of FIG.

FIG. 6 is an explanatory view showing a method of locking the receiving-side connecting rod piece to the receiving-side holding metal fitting when assembling the pipe connection structure according to the present invention.

7 (A) is a plan view showing another example of the pipe connection structure according to the present invention, and FIG. 7 (B) is a cross-sectional view taken along line 7- (B) of FIG.

[Explanation of symbols]

 a Entry b Entry A A Entry side metal fitting B Entry side metal fitting 1 Connecting rod C Expansion / bending movable part

Claims (3)

[Claims] 1. An insertion port of one pipe is inserted into a receiving port of the other pipe via a rubber ring, and metal fittings are respectively bound and fixed to the pipe end portion and the receiving port on the insertion port side. In a pipe connecting structure in which the tensile strength members are connected to each other, the tensile strength members can be expanded and contracted or slid in the axial direction of the pipe, and are bent toward both axes perpendicular to the axial direction of the pipe and orthogonal to each other. A pipe connection structure characterized by being possible. 2. A connecting rod piece having a bifurcated parallel portion at the other end of a base portion whose one end is engaged with one of the metal fittings, each piece of the bifurcated parallel portion being a long ring shape, Further, a hook-shaped head slidably fitted to both long ring-shaped pieces of the same bifurcated parallel part is provided at the tip of the main body having a thickness passed through the parallel gap of the parallel part, and the other end has the other metal fitting. The pipe connecting structure according to claim 1, wherein a tension-resistant member is constituted by a connecting rod piece that is locked to. 3. The socket-side fitting is a two-split body that engages with a shoulder on the outer surface of the socket, and the ears of the respective divided pieces are overlapped at the cracked portion, and the tension-resistant member is attached to these ears. Is provided with a through hole at the other end of the connecting rod and a slit for introducing the other end of the connecting rod from the outside into the through hole, and the other end of the connecting rod is brought into contact with both side surfaces of the ear portion. The pipe connection structure according to claim 1, further comprising a collar.