JPH1144388A - Pipe joint construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high separation preventing effect of a pipe joint against external force in the drawing out direction and to advantageously reduce weight and a manufacturing cost by forming a partially spherical cylinder part swelling outward in the radial direction on a first cylindrical body, and relatively oscillatably connecting a second cylindrical body to this so as to be fitted from the outside in a sealed up state. SOLUTION: A first joint pipe 1 as a first cylindrical body is integratedly formed with a partially spherical pipe part 1A swelling outward in the radial direction, and a partially spherical pipe part 2A formed on a second joint pipe 2 is relatively oscillatably connected to this so as to be fitted from the outside in a sealed up state. Plate-like ribs 8 projeting toward the cylinder axis X side of the first joint pipe 1 are integratedly formed along the cylinder axis in the X-direction on a plurality of the respective positions arranged at equal intervals in the circumferential direction on the inner circumferential face 1b of the partially spherical pipe part 1A. Through holes 9 with which hooks for suspending the first joint pipe 1 are locked are formed on the opening side end parts of the ribs 8 alternately positioned in the circumferential direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a pipe system for a fluid transport pipe such as a water pipe buried underground, which has a shear force in a direction intersecting a cylinder axis caused by an earthquake, uneven settlement, or the like. When an external force such as a bending moment is applied, the external force is absorbed as much as possible in the pipe connection part and the damage to the fragile part of the piping system can be suppressed, so that the first cylindrical body is outwardly directed in the cylindrical radial direction. Form a partial spherical cylinder that bulges into
The present invention relates to a pipe joint structure in which a second tubular body is externally connected in a sealed state so as to be swingable relative to each other.

[0002]

2. Description of the Related Art In a conventional pipe joint structure, as shown in FIG. 6, a partial spherical cylindrical portion 51A bulging outward in a cylindrical radial direction is formed at one end of the first cylindrical body 51. A second cylindrical body 52 having a partial spherical inner peripheral surface slidable with respect to the partial spherical outer peripheral surface of the partial spherical cylindrical portion 51A;
A and a connecting cylinder 55 having a partial spherical inner peripheral surface slidable with respect to the partial spherical outer peripheral surface of the first cylindrical body 51 and a partial spherical cylindrical portion 51A of the first cylindrical body 51 so as to be relatively swingable. Connecting flange 5 protrudingly formed on the outer peripheral surface of second cylindrical body 52
2B and a connecting flange 55B protruding from the outer peripheral surface of the connecting cylinder 55 are fastened with bolts 53 and nuts 54, so that the first cylindrical body 51 and the second cylindrical body 52 are partially spherical. There has been proposed a device which is connected so that it can be slidably and slidably slidably along (for example, see Japanese Utility Model Application Laid-Open No. 57-71883).

In the conventional pipe joint structure, an excessive external force in the pull-out direction due to an earthquake, uneven settlement, or the like is applied between the first tubular body 51 and the second tubular body 52. When acting, the partial spherical inner peripheral surface of the connecting cylinder 55 and the second
First cylindrical body 51 slidably in contact with a partially spherical inner peripheral surface of cylindrical body 52
The partial spherical cylindrical portion 51A may be compressed and deformed to the reduced diameter side, and the partial spherical cylindrical portion 51A of the first cylindrical body 51 may fall out of the connecting cylinder 55 and the second cylindrical body 52. Therefore, as a method for preventing such detachment, the first cylindrical body 51 is used.
It is conceivable to improve the strength by increasing the thickness of the entire peripheral wall of the partial spherical cylindrical portion 51A.
Not only does the tubular body 51 increase in weight, but also causes a rise in manufacturing costs and transportation costs, and also causes a reduction in work efficiency at the construction site.

The present invention has been made in view of the above circumstances, and its main problem is that the structure of the partial spherical cylindrical portion of the first cylindrical body is devised so as to be able to separate from the external force in the drawing direction. A pipe joint structure having a high prevention effect can be advantageously manufactured in terms of weight reduction, manufacturing cost, transportation cost, and work efficiency at a construction site.

[0004]

The characteristic feature of the pipe joint structure according to claim 1 of the present invention is that a partial spherical cylindrical portion which bulges outward in a cylindrical radial direction is formed on a first cylindrical body, and this partial spherical body is formed. In the cylinder,
A pipe joint structure in which a second cylindrical body is externally connected in a sealed state so as to be swingable relative to each other, and a rib protruding toward a cylinder axis is provided on an inner peripheral surface of the partial spherical cylindrical portion. On the point. According to the above-mentioned characteristic configuration, a large external force in the pulling direction caused by an earthquake, unequal settlement, or the like acts between the first cylindrical body and the second cylindrical body, so that the second cylindrical body is internally driven. Even if a component force in the diameter reducing direction is applied to the partially spherical cylindrical portion of the first cylindrical body fitted and connected,
The component toward the reduced diameter side can be reliably received by the partial spherical cylindrical portion of the first cylindrical body reinforced by the rib. Moreover, as compared with the case where the thickness of the entire peripheral wall of the partial spherical cylindrical portion of the first cylindrical body is increased, the amount of the raw material used for forming the first cylindrical body is increased, and the accompanying Weight increase of one cylindrical body can be suppressed. Therefore, the manufacturing cost and the transportation cost can be reduced by reducing the weight of the first cylindrical body while improving the effect of preventing the detachment of the external force in the drawing direction as compared with the conventional pipe joint structure. On-site work efficiency can also be improved.

[0005] The characteristic feature of the pipe joint structure according to the second aspect of the present invention is that the ribs are provided at a plurality of positions equidistantly in the circumferential direction of the inner peripheral surface of the partial spherical cylindrical portion of the first cylindrical body. The point is that it is formed along the cylinder axis direction of the first cylindrical body. According to the above-mentioned characteristic configuration, even though a plurality of ribs achieving the effect described in claim 1 are provided, since each of these ribs is in a posture along the cylinder axis direction, the pressure loss is suppressed by the rectifying action of each rib. can do.

A feature of the pipe joint structure according to a third aspect of the present invention is that the front end surface of each of the ribs on the cylinder axis side is connected to the straight cylindrical portion of the first cylindrical body which is continuous with the partial spherical cylindrical portion. Is disposed on the virtual extension peripheral surface of the inner peripheral surface or on the radially outer side of the virtual extension peripheral surface. According to the above-mentioned characteristic configuration, since each rib does not project inward in the cylinder radial direction from the virtual extension peripheral surface of the straight cylindrical portion of the first cylindrical body, for example,
As in the case where each rib protrudes inward in the cylinder radial direction from the inner peripheral surface of the straight cylindrical portion on the other end side of the first cylindrical body, the lateral area of the flow path is reduced by the protruding rib portion. Therefore, the pressure loss of the fluid in the partial spherical cylindrical portion of the first cylindrical body can be suppressed accordingly.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] The pipe joint structure for fluid transport (for example, for tap water) shown in FIGS. 1 and 2 is constructed by inserting a first joint pipe 1 made of cast iron as a first cylindrical body in a pipe diameter direction (pipe diameter). Direction) A partial spherical tube portion 1A as a partial spherical tube portion bulging outward is integrally formed, and a second joint tube 2 made of cast iron as a second cylindrical body is formed in the partial spherical tube portion 1A. A partial spherical pipe portion 2A as a partial spherical cylindrical portion is externally fitted and connected in a sealed state so as to be swingable relative to each other, and a pair of first joint pipes 1 each of which is externally fitted with the second joint pipe 2 respectively. The straight pipes 1B as straight pipes which are continuous with the partial spherical pipe 1A are connected to each other through a straight third pipe 3 made of cast iron as a third cylindrical body.
The first joint pipe 1 and the second joint pipe 2 are connected in a sealed state so as to be relatively movable in a direction (pipe axis direction).
And the third joint pipe 3 are connected and connected.

As shown in FIGS. 1 to 4, the first joint pipe 1 and the second joint pipe 2 are partially spherical tube sections 2 of the second joint pipe 2.
A, the partial spherical pipe portion 1A of the first joint pipe 1 is inserted from the outside in the cylinder axis X direction, and the first joint pipe 1A is inserted into the partial spherical inner peripheral surface 2a of the partial spherical pipe section 2A of the second joint pipe 2. Partially spherical tube part 1 of tube 1
A outer peripheral surface 1a of the partial spherical tube portion 1A of the first joint pipe 1 is fitted around the outer peripheral surface 1a of the first joint pipe 1 so as to be freely slidable and swingable.
And the inner peripheral surface 2b on the opening side of the partial spherical pipe portion 2A of the second joint pipe 2
The sliding contact guide member 4 made of cast iron is fitted from the outside in the cylinder axis X into the gap formed between the second joint pipe 2 and the sliding joint guide member 4 formed on the opening side inner peripheral surface 2b of the partial spherical pipe portion 2A of the second joint pipe 2. The C-shaped retaining member 5 made of a stainless steel, which can be reduced in diameter and which can prevent the sliding movement of the sliding contact guide member 4, is detachably fitted into the holding groove 2 c. Stop connection. The inner peripheral surface 4a of the sliding contact guide member 4 is partially spherical tube portion 1A of the first joint tube 1 in a state of being fitted in the gap.
Is formed on a partial spherical surface along the outer peripheral surface 1a of the first member. Both inner peripheral surfaces 2a, 2b of the partial spherical pipe portion 2A of the second joint pipe 2
An annular seal holding an elastic sealing material 6 made of synthetic rubber (for example, styrene-butadiene rubber), which is an example of a sealing structure for sealing between the outer peripheral surface 1a of the spherical pipe portion 1A of the first joint pipe 1, is provided therebetween. A seal holding groove 7 is formed. The first joint pipe 1 and the second joint pipe 2 are configured such that the outer peripheral surface 1a of the partial spherical pipe part 1A of the first joint pipe 1 is partially spherical inner peripheral part of the partial spherical pipe part 2A of the second joint pipe 2. By slidingly contacting the surface 2a, the inner peripheral surface 4a of the sliding contact guide member 4, and the elastic sealing material 6, the outer fitting is connected in a sealed state so as to be able to slide and swing relatively.

As shown in FIGS. 1 to 3, a plurality of portions (e.g., eight portions in the first embodiment) at equal intervals in the circumferential direction of the inner peripheral surface 1b of the partial spherical tube portion 1A of the first joint tube 1 are provided. ), A plate-like rib 8 protruding toward the cylinder axis X of the first joint pipe 1 is integrally formed along the cylinder axis X direction.
Ribs 8 of the ribs 8 which are located every other in the circumferential direction
A through-hole 9 is formed at the opening side end of the opening to be hooked by a hook (not shown) of a suspension device for suspending the first joint pipe 1. Each of the ribs 8 extends from a position slightly intruding from the open end of the partial spherical tube portion 1A of the first joint pipe 1 to a boundary portion between the partial spherical tube portion 1A and the straight tube portion 1B. In addition, the distal end surface 8a of each rib 8 on the cylinder axis X side is arranged on a virtual extension peripheral surface of the inner peripheral surface of the straight pipe portion 1B of the first joint pipe 1. In other words, each of the ribs 8 is formed so as not to protrude toward the cylinder axis X from the virtual extension peripheral surface of the inner peripheral surface of the straight pipe portion 1B of the first joint pipe 1.

As shown in FIG. 1, FIG. 2 and FIG.
The straight pipe part 1B of each first fitting pipe 1 is inserted into the both ends of the third fitting pipe 3 from the outside in the direction of the cylinder axis X. The annular mounting groove 10 formed on the outer peripheral surface of the portion 1B is brought into surface contact with the end surface 11a of the annular regulating groove 11 formed on the inner peripheral surface of the third joint pipe 3 in the direction of the cylinder axis X by the surface contact. The cylinder is formed by detachably fitting a C-shaped engaging member 12 made of stainless steel capable of expanding and deforming, which restricts the straight pipe portion 1B of the first joint pipe 1 from coming out of the third joint pipe 3. The stoppers are connected so as to be relatively movable in the axis X direction. The outer peripheral surface of the straight pipe portion 1B of the first joint pipe 1 is brought into contact with the end face of the third joint pipe 3 from the cylinder axis X direction,
An annular stopper portion 13 for restricting the relative movement of the first joint pipe 1 and the third joint pipe 3 further in the contraction direction is integrally formed, and the first joint pipe 1 and the third joint pipe 3 are connected to each other. The relative movement range in the cylinder axis X direction is regulated so as to be within a certain range. The straight pipe portion 1 of the first joint pipe 1 is provided on each of the inner peripheral surfaces of the third joint pipe 3 at both ends in the cylinder axis X direction.
An annular seal holding groove 15 for holding an elastic seal material 14 made of synthetic rubber (for example, styrene-butadiene rubber), which is an example of a sealing structure for sealing the outer peripheral surface of B, is formed. And the said 1st joint pipe 1 and the 3rd joint pipe 3
The locking member 12 contacts the end surface 11a of the regulating groove 11,
The outer peripheral surface of the straight pipe portion 1B of the first joint pipe 1 slides against the elastic sealing material 14 within a certain range while the end face of the joint pipe 3 comes into contact with the stopper portion 13, so that the cylindrical pipe core extends in the X axis direction. Inserted and connected in a sealed state so as to be relatively movable.

When the first joint pipe 1 and the second joint pipe 2 relatively slide and swing to the maximum bending angle, an annular tapered surface continuous with the inner peripheral surface 4a of the slide contact guide member 4. 4b
Are configured to make line contact with the outer peripheral surface of the straight pipe portion 1B of the first joint pipe 1.

Each of the ends of the straight pipe portion 2B formed at the other end of the second joint pipe 2 has another fluid piping device such as a fluid transport pipe (eg, a water pipe) or a gate valve device. A connecting flange 2C for fixing and connecting P with bolts and nuts is integrally formed.

[Other Embodiments] A partial spherical cylindrical portion which bulges outward in the radial direction of the cylinder is formed integrally with a first cylindrical member, and a partial spherical member formed on a second cylindrical member is formed on the partial spherical cylindrical portion. The cylindrical part and the partial spherical cylindrical part of the connecting cylinder having a connecting flange that can be fixedly connected via bolts and nuts to the connecting flange protruding from the outer peripheral surface of the partial spherical cylindrical part, on both sides in the axial direction of the cylindrical axis. And the connecting flange on the second cylindrical body side and the connecting flange on the connecting cylinder are fastened with bolts and nuts to connect the first cylindrical body and the second cylindrical body to the first cylindrical body. An inner peripheral surface of the partial spherical cylindrical portion of the first cylindrical body, in a pipe joint structure in which the outer peripheral surface of the partial spherical cylindrical portion of the cylindrical body is relatively slidably contacted and slidably and externally connected in a sealed state in a sealed state. Plate-shaped ribs projecting toward the cylinder axis side of the first cylindrical body are provided at each of a plurality of locations at equal intervals in the circumferential direction of the cylinder. It may be integrally formed along the axis direction. In the above-described embodiment, each of the tubular bodies is manufactured from cast iron. However, the present invention is not limited to this, and each of the tubular bodies may be made of stainless steel, synthetic resin, or the like. Each of the ribs 8 is formed separately from the first cylindrical body 1, and the inner peripheral surface 1b of the partial spherical cylindrical portion 1A of the first cylindrical body 1 by welding or the like.
It may be integrally fixed to the body. The distal end surface 8a on the cylinder axis X side of each of the ribs 8 may be arranged outside the virtual extension peripheral surface of the inner peripheral surface of the straight cylindrical portion 1A of the first cylindrical body 1 in the cylinder radial direction. In the embodiment, the straight pipe portions 2 of the second joint pipes 2
A connecting flange 2C for fixedly connecting other fluid piping devices P with bolts and nuts is integrally formed at the end of B, but the present invention is not limited to this configuration.
The configuration of the straight pipe portion 2B can be changed according to the configuration of the connection portion of the other fluid piping devices P. For example, when the connection portion of the other fluid piping devices P is formed in an insertion port, a socket for fitting the insertion port of the fluid piping devices P to the straight pipe portion 2B of the second joint pipe 2 is provided. Form.

[Brief description of the drawings]

FIG. 1 is an overall longitudinal sectional view showing a first embodiment of a pipe joint structure of the present invention.

FIG. 2 is a longitudinal sectional view showing a state of relative swing.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a partially enlarged cross-sectional view of a connection portion between a first tubular body and a second tubular body.

FIG. 5 is a partially enlarged cross-sectional view of a connection portion between a first tubular body and a third tubular body.

FIG. 6 is a partially cutaway sectional view showing the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st cylindrical body 1A Partial spherical cylindrical part 1b Inner peripheral surface 2 2nd cylindrical body 8 Rib 8a Tip surface X cylindrical shaft core

Claims (3)

[Claims] A first cylindrical body is formed with a partially spherical cylindrical part which bulges outward in the radial direction of the cylinder, and a second cylindrical body is mounted on the partial spherical cylindrical part in a sealed state so as to be relatively swingable. A pipe joint structure which is fitted and connected, wherein a rib protruding toward the cylinder axis is provided on an inner peripheral surface of the partial spherical cylindrical portion. 2. The method according to claim 1, wherein the ribs are provided at a plurality of positions equidistantly in the circumferential direction of an inner peripheral surface of the partial spherical cylindrical portion of the first cylindrical body along a cylinder axis direction of the first cylindrical body. The pipe joint structure according to claim 1, wherein the pipe joint structure is formed. 3. A tip end surface on a cylinder axis side of each of the ribs is on a virtual extension peripheral surface of an inner peripheral surface of a straight cylindrical portion of the first cylindrical body that is continuous with the partial spherical cylindrical portion, or The pipe joint structure according to claim 2, wherein the pipe joint structure is disposed radially outward of the virtual extension peripheral surface.