EXPANSION/CONTRACTION FLEXIBLE JOINT STRUCTURE AND ASEISMATIC REPAIR VALVE

• Main Authors: HASHIOKA YOSHIO, KAWASAKI KOICHI, KURETAKE KENJI
• Format: Patent
• Language: English; Japanese
• Published: 22.10.2020
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; TAPS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

To provide an expansion/contraction flexible joint structure and an aseismatic repair valve capable of blocking a flow channel in a state of securing a prescribed installation depth of a fire hydrant or an air valve by being connected between a water pipe and the fire hydrant or the air valve, while suppressing increase of a length in a tangential direction, preventing damage of the fire hydrant and the air valve by exerting expansion/contraction performance in occurrence of earthquake, and exerting superior earthquake resistance by improving strength of an expansion/contraction flexible side.SOLUTION: An expansion/contraction flexible joint structure includes a plug 41 disposed on a piping material 10, a pressing ring 21 fitted to an outer peripheral surface of the plug 41 through a flexible space S in a loosely fitting state, a socket member 22 to which the pressing ring 21 is fixed, a locking projection portion 50 formed on the outer peripheral surface of the plug 41 integrally or separately, a spacer 30 held on an inner periphery of the pressing ring 21, and a rubber ring 31 for keeping sealability between an inner peripheral surface of the socket member 22 and the outer peripheral surface of the plug 41. In an ordinary time, the locking projection portion 50 is held by the spacer 30 in a locked state, and in an expansion/contraction flexible time, the expansion/contraction flexible joint structure is expanded and contracted through the flexible space S in a state of crushing the spacer 30.SELECTED DRAWING: Figure 1 【課題】接続方向への長さの増加を抑えつつ水道管との間に接続して消火栓や空気弁の所定の設置深さを確保した状態で流路を遮断でき、地震発生時には伸縮可撓性を発揮して消火栓や空気弁の損傷を防ぎ、しかも、伸縮可撓側の強度を向上して優れた耐震性を発揮する伸縮可撓継手構造と耐震補修弁を提供する。【解決手段】配管機材１０に設けられた挿し口４１と、この挿し口４１の外周面に可撓スペースＳを介して遊嵌状態に嵌められた押輪２１と、この押輪２１が固着された受け口部材２２と、挿し口４１の外周面に一体に又は別体に形成された係止突条部５０と、押輪２１の内周に保持されたスペーサ３０と、受け口部材２２の内周面と挿し口４１の外周面との間にシール性を保持するためのゴム輪３１とを備える。平常時には係止突条部５０がスペーサ３０に係止状態で保持され、伸縮可撓時にはスペーサ３０を潰した状態で可撓スペースＳを介して伸縮可撓する。【選択図】 図１