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公开(公告)号：EP0133414A1
公开(公告)日：1985-02-20
申请号：EP84630111.7
申请日：1984-07-27
CPC分类号： E02B11/005
摘要： @ A sub-soil drainage pipe segment (12) comprises a first round cylindrical portion (14) forming a socket (16) and a second round cylindrical portion (18) integral with and extending from the first portion (14), the inside diameter of the first portion (14) being substantially equal to the outside diameter of the second portion (18), in the second portion (18) there are a plurality of circumferentially spaced, longitudinally extending slots (22). The slots (22) are defined by longitudinally extending side walls (24) which diverge from the outside inwardly. A plain end (20) of the second portion (18) forms a spigot which is receivable in the socket (16) of a similar segment, so that a number of such segments can be interconnected end-to-end to form a sub-soil drainage line.
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公开(公告)号：EP0345690B1
公开(公告)日：1992-02-26
申请号：EP89110132.1
申请日：1989-06-05
CPC分类号： E21B43/086 , E03B3/18
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公开(公告)号：EP0345690A1
公开(公告)日：1989-12-13
申请号：EP89110132.1
申请日：1989-06-05
CPC分类号： E21B43/086 , E03B3/18
摘要： An apertured pipe segment is disclosed which is of injection moulded plastics construction and can be used to form a well screen or sub-soil drainage pipe. Each aperture comprises a longitudinally extending inner slot 18 which extends from a slot mouth 24 inwardly and is defined by inwardly diverging slot walls 22, and an outer slot 20 which extends from the outside of the pipe segment inwardly to the slot mouth. The smallest width of the outer slot is greater than the width of the slot mouth. The inner slot is open longitudinally to one end of the pipe segment and the outer slot is open longitudinally to the other end of the pipe segment. The pipe segments can thus be made by an inexpensive two-part mould not requiring collapsible cores.
摘要翻译： 公开了一种具有注射成型塑料结构的多孔管段，可用于形成井筛或排水管。 每个孔包括纵向延伸的内槽18，其从槽口24向内延伸并且由向内发散的槽壁22以及从管段的外部向内延伸到槽口的外槽20限定。 外槽的最小宽度大于槽口的宽度。 内槽纵向延伸到管段的一端，外槽纵向延伸到管段的另一端。 因此，管段可以由不需要可折叠芯的廉价的两部分模具制成。
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