Rail tie having embedded automatic differential settlement compensation apparatus using oil pressure for railroad tracks

A sleeper having an embedded automatic track differential settlement compensation apparatus using oil pressure, comprising:

• a concrete sleeper (130), installed at a track bed gravel (120) or an asphalt roadbed (160) and configured to deliver a traveling load of a train (300) to the track bed gravel (120) or the asphalt roadbed (160);
• a first automatic differential settlement compensation apparatus (200a), embedded and installed underneath one side of the concrete sleeper (130) and configured to automatically compensate for a differential settlement of the concrete sleeper (130) using oil pressure when a loose sleeper occurs due to the traveling load of the train (300);
• and
• a second automatic differential settlement compensation apparatus (200b), embedded and installed underneath the other side of the concrete sleeper (130) so as to operate independently and separately from the first automatic differential settlement compensation apparatus (200a) and configured to automatically compensate for the differential settlement of the concrete sleeper (130) using oil pressure when the loose sleeper occurs,
• wherein the first and second automatic differential settlement compensation apparatuses (200a, 200b) are separately installed at left and right sides of the concrete sleeper (130), respectively, thereby automatically compensating for a differential settlement of left and right rails (140) due to the traveling load of the train (300),
• wherein each of the first and second automatic differential settlement compensation apparatuses includes:
• a spring (260), having one end fixed to an oil hydraulic cylinder (240) and the other end fixed to a cylindrical rod (250) and configured to provide an expansion force enabling the cylindrical rod (250) to move forward when the loose sleeper occurs;
• the cylindrical rod (250), configured to move forward by means of the oil pressure so as to come into contact with the track bed gravel (120) or the asphalt roadbed (160) which was settled when the loose sleeper occurs due to a differential settlement of the track bed gravel (120) or the asphalt roadbed (160) by the traveling load of the train (300);
• an oil tank (210), embedded underneath the concrete sleeper (130) to store oil;
• the oil hydraulic cylinder (240), configured to receive the oil from the oil tank (210) when a vacuum pressure, which is a negative pressure, is generated according to a forward movement of the cylindrical rod (250);
• and
• a check valve (230), installed between the oil tank (210) and the oil hydraulic cylinder (240) so as to open and close an oil supply from the oil tank (210) to the oil hydraulic cylinder (240).