摘要：【中文】本发明公开了换井底完井管柱及作业方法，所述膨胀管柱上端连接应急丢手连接套，应急丢手连接套套装在上连接管外壁，所述膨胀管柱下端连接尾管丢手连接套，所述尾管上端连接尾管丢手连接套，尾管下端连接碰压球座，所述尾管丢手上端连接膨胀头，尾管丢手下端连接中心内管，所述膨胀头上端通过中连接管连接应急丢手花键轴，应急丢手花键轴上端连接上连接管下端，所述尾管丢手外壁丝扣式连接尾管丢手连接套内壁，所述膨胀头外壁开设曲面外肩台，当膨胀头向上移动时，膨胀头的曲面外肩台贴合式顶在缩径段内壁的曲面内肩台上。实现大尾管换井底，保证固井质量，为后续作业工序提供大通道，完善井筒完整性，满足后续生产需要。 【EN】The invention discloses a well completion pipe string for shaft changing and an operation method, wherein an emergency releasing connecting sleeve is connected to the upper end of an expansion pipe string, the emergency releasing connecting sleeve is sleeved on the outer wall of an upper connecting pipe, a tail pipe releasing connecting sleeve is connected to the lower end of the expansion pipe string, a tail pipe releasing connecting sleeve is connected to the upper end of the tail pipe, a collision ball seat is connected to the lower end of the tail pipe, an expansion head is connected to the upper end of the tail pipe releasing connecting sleeve, a central inner pipe is connected to the lower end of the tail pipe releasing connecting sleeve, an emergency releasing spline shaft is connected to the upper end of the expansion head through a middle connecting pipe, the upper end of the emergency releasing spline shaft is connected to the upper end of the upper connecting pipe, the tail pipe releasing outer wall is in threaded connection with the inner wall of the tail pipe releasing connecting sleeve, a curved outer. The large tail pipe shaft replacement is realized, the well cementation quality is ensured, a large channel is provided for the subsequent operation process, the integrity of the shaft is perfected, and the subsequent production requirement is met.

摘要：【中文】本发明提出一种山岭隧道预制拼装仰拱及其施工方法，该山岭隧道预制拼装仰拱包括两凸一凹预制块、两凹一凸预制块、三凸预制块和三凹预制块；所述两凸一凹预制块的右侧面与所述三凸预制块的左侧面、所述三凹预制块的左侧面与所述两凹一凸预制块的右侧面通过凹槽和凸起定位拼装，顶面横向通过螺栓杆连接；所述两凸一凹预制块的后侧面与所述两凹一凸预制块的前侧面、所述三凸预制块的后侧面与所述三凹预制块的前侧面通过凸起和凹槽定位拼装，顶面纵向通过螺旋杆连接。该拼装仰拱施工工序简化，既能够快速施工，还能够保证施工质量。 【EN】The invention provides a prefabricated assembled inverted arch for a mountain tunnel and a construction method thereof, wherein the prefabricated assembled inverted arch for the mountain tunnel comprises two convex-concave prefabricated blocks, two concave-convex prefabricated blocks, three convex prefabricated blocks and three concave prefabricated blocks; the right side surfaces of the two convex-concave precast blocks and the left side surface of the three convex precast blocks, the left side surface of the three concave precast blocks and the right side surfaces of the two concave-convex precast blocks are positioned and assembled through grooves and bulges, and the top surfaces are transversely connected through bolt rods; the rear side surfaces of the two convex-concave precast blocks and the front side surfaces of the two concave-convex precast blocks as well as the rear side surfaces of the three convex precast blocks and the front side surfaces of the three concave precast blocks are positioned and assembled through bulges and grooves, and the top surfaces are longitudinally connected through screw rods. The assembling inverted arch construction process is simplified, rapid construction can be achieved, and construction quality can be guaranteed.