摘要：【中文】本发明涉及桩基础技术领域，公开了便于下放的后置式砼桩头断裂方法，包括以下步骤，A.钢筋笼(1)设计标高上端的钢筋和检测管套装包裹层(11)；B.砼浇筑结束后，凝固前，下放断裂装置(2)，将金属盖(22)下放到预断面(3)；C.砼凝固达到初期强度后(一般10兆帕以上)，向第一千斤顶(25)加压，使金属盖(22)所在层的砼断裂；D.待基坑开挖后再次启动第一千斤顶(25)，吊离金属盖(22)上侧的砼；E.接着启动第二千斤顶(26)，使断裂装置(2)脱离桩基础砼。第一千斤顶首先对预断面产生压力，使砼断裂。接着第一千斤顶对金属盖产生向上的压力，便于已断裂砼的吊离；简化了工人撬开预断面上侧砼的施工难度，节约了工况时间。 【EN】The invention relates to the technical field of pile foundations, and discloses a rear concrete pile head fracture method convenient to lower, which comprises the following steps that A, a wrapping layer (11) is sleeved on a steel bar and a detection pipe at the upper end of a designed elevation of a steel bar cage (1); B. after concrete pouring is finished and before solidification, the breaking device (2) is put down, and the metal cover (22) is put down to the pre-fracture surface (3); C. after the concrete is solidified to reach the initial strength (generally over 10 MPa), pressurizing the first jack (25) to break the concrete of the layer where the metal cover (22) is positioned; D. after the foundation pit is excavated, starting the first jack (25) again, and hoisting the concrete on the upper side of the metal cover (22); E. and then the second jack (26) is started to separate the breaking device (2) from the pile foundation concrete. The first jack firstly generates pressure on the pre-section to break the concrete. Then the first jack generates upward pressure on the metal cover, so that the broken concrete can be conveniently lifted off; the construction difficulty of prying the concrete on the upper side of the pre-fracture surface by workers is simplified, and the working condition time is saved.

摘要：【中文】本发明涉及建筑桩基础技术领域，公开了一种后置式砼桩头断裂的施工方法，包括以下步骤，A.钢筋笼(1)上端套装包裹层(11)；B.砼凝固前，下放断裂装置(2)，将断裂装置(2)的金属盖(22)下放到预断面(3)同一水平的位置；C.砼凝固后，向环形水压腔(24)加压，使金属盖(22)所在层的砼断裂；D.再启动第一千斤顶(25)，吊离金属盖(22)上侧的砼；E.接着启动第二千斤顶(26)，使断裂装置(2)脱离桩基础砼。环形水压腔对四周的砼产生压力，使预断面砼断裂。接着第一千斤顶对金属盖产生向上的压力，便于已断裂预断面上侧砼的吊离；简化了工人撬开预断面上侧砼的施工难度，节约了工况时间。 【EN】The invention relates to the technical field of building pile foundations, and discloses a construction method for rear concrete pile head fracture, which comprises the following steps that A, a wrapping layer (11) is sleeved at the upper end of a reinforcement cage (1); B. before the concrete is solidified, lowering the breaking device (2), and lowering a metal cover (22) of the breaking device (2) to the same horizontal position of the pre-fracture surface (3); C. after the concrete is solidified, pressurizing the annular water pressure cavity (24) to break the concrete on the layer where the metal cover (22) is positioned; D. then the first jack (25) is started to lift off the concrete on the upper side of the metal cover (22); E. and then the second jack (26) is started to separate the breaking device (2) from the pile foundation concrete. The annular hydraulic pressure cavity generates pressure on the concrete around to break the concrete with the pre-section. Then the first jack generates upward pressure on the metal cover, so that the concrete on the upper side of the fractured pre-fracture surface can be conveniently lifted off; the construction difficulty of prying the concrete on the upper side of the pre-fracture surface by workers is simplified, and the working condition time is saved.