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1. 发明授权

US4134529A Method of joining coated large-diameter steel pipes laid underground 失效
标题翻译：连接地下埋设涂层大口径钢管的方法
公开(公告)号：US4134529A
公开(公告)日：1979-01-16
申请号：US779601
申请日：1977-03-21
申请人： Atsushi Hara , Tatsuaki Takeuchi , Jun-ichi Ogata
发明人： Atsushi Hara , Tatsuaki Takeuchi , Jun-ichi Ogata
IPC分类号： B23K9/028 , F16L13/02 , F16L58/18 , B21D39/04
CPC分类号： B23K9/0282 , F16L13/0272 , F16L58/18
摘要： A method of joining coated large-diameter steel pipes laid underground which comprises placing the steel pipes end to end, applying a layer of heat insulating material to the outer surface of the welding part, covering the ends of the pipe coating the non-coated part of the pipe ends and the layer of the heat insulating material with a layer of a heat fusible, heat adhesive, corrosion resisting material of a shape corresponding to the external shape of the pipes, placing a thin clamp plate around the outer surface of this layer to make it fast, and then internally welding the groove to join the pipes together, whereby the welding heat is utilized effectively and both the corrosion resisting material and the pipe coating are fused by the heat, thus causing the thermally fused corrosion resisting material to adher and solidify on the uncoated portions of the pipes and unite with the ends of the pipe coating and thereby forming a corrosion resisting covering layer. In addition, in the laying of steel pipes there is no need to dig a special excavation of an especially large cross-sectional area around the joint, and upon completion of the assemblying of the above-mentioned various joining material the excavation around the joining part can be backfilled prior to the welding of the joining part of the pipe, thus ensuring speedy laying of steel pipes in the ground, particularly a reduction in the time required from the beginning of laying up to the backfilling of excavation.
摘要翻译：一种将地下铺设的涂覆的大直径钢管接合在一起的方法，包括将钢管端对端放置，将一层隔热材料涂覆到焊接部分的外表面，覆盖涂覆无涂层部分的管的端部的管端和绝热材料层，具有热熔，热粘合剂层，与管的外形对应的形状的耐腐蚀材料，在该层的外表面周围放置薄夹板使其快速，然后内部焊接槽以将管连接在一起，从而有效地利用焊接热，并且耐腐蚀材料和管涂层都被热熔合，从而使耐热熔耐腐材料粘附并且在管的未涂覆部分上固化，并与管涂层的端部结合，从而形成耐腐蚀性覆盖层。此外，在铺设钢管时，不需要在接头周围开挖特别大的横截面积的特殊挖掘，并且在上述各种接合材料的组装完成后，围绕接合部的挖掘可以在管道的接合部分的焊接之前回填，从而确保钢管在地面中的快速铺设，特别是从开始铺设到回填开始所需的时间减少。

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