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1. 发明专利

JP2002194503A STEEL TUBE WITH SUPERIOR BUCKLING RESISTANCE, AND PRODUCTION METHOD AND EVALUATION SYSTEM FOR THE SAME 失效
公开(公告)号：JP2002194503A
公开(公告)日：2002-07-10
申请号：JP2000400636
申请日：2000-12-28
申请人： NIPPON KOKAN KK
发明人： ENDO SHIGERU , ISHIKAWA NOBUYUKI , SUZUKI NOBUHISA , KONDO JO
IPC分类号： G01N3/08 , C21D8/10 , C22C38/00 , C22C38/04 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel tube with superior buckling resistance together with the production method and evaluation system for the same. SOLUTION: This steel tube having superior buckling resistance is characterized in that the stress ratio (σr-C) which is a ratio of the yield strength and the stress (σ1.5) at the nominal distortion of 1.5% in the steel tube tensile test in the tube's circumferential direction is 1.05 or greater and/or that the stress ratio (σr-L) which is a ratio of the yield strength and the stress (σ1.5) at the nominal distortion of 1.5% in the steel tube tensile test in the tube's axial direction is 1.05 or greater. Furthermore, the steel tube may contain at mass% C: 0.03-0.1%, Si: 0.05-0.5%, Mn: 1-2% and the remainder substantially consisting of Fe, with PCM value shown by the formula, PCM=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5×B, satisfying the range of 0.10-0.20.

2. 发明专利

JP2001040987A PROPULSION PIPE JOINT STRUCTURE AND METHOD FOR JOINING THE SAME BY WELDING 失效
公开(公告)号：JP2001040987A
公开(公告)日：2001-02-13
申请号：JP21304899
申请日：1999-07-28
申请人： NIPPON KOKAN KK
发明人： ONO YOSHIMI , YOSHIKAWA MASAKI , KATO AKIHIKO , SUZUKI NOBUHISA
IPC分类号： E21D9/06 , B23K9/00 , B23K9/028 , B23K101/10 , F16L1/024 , F16L58/02
摘要： PROBLEM TO BE SOLVED: To provide a propulsion pipe joint structure which can enhance the efficiency of entire propulsion construction work, which can cope with axial displacement and bending displacement caused by tension and compression at junctions during propulsion, and which is excellent in corrosion resistance and to provide a method for joining the structure by welding. SOLUTION: A leading propulsion steel pipe 1a comprises a main pipe 2a, a sheath pipe 3a and a mortar layer 4 packed therebetween. A following propulsion steel pipe 1b comprises a main pipe 2b, a sheath pipe 3b and a mortar layer 4 packed therebetween. The main pipe 2a of the leading propulsion steel pipe 1a is butted against the main pipe 2b of the following propulsion steel pipe 1b before propulsion work, and partial welding is performed from their outer surfaces. Subsequently, propulsion work is performed and similar partial welding and propulsion work for the main pipes are repeated to perform main welding from the inner surfaces at a time within a period of time that does not affect the propulsion work, so as to join the pipes together.

3. 发明专利

JPH11141792A STRUCTURE AND METHOD FOR MOUNTING BREAKING ARRESTER FOR JOINING PIPE 失效
公开(公告)号：JPH11141792A
公开(公告)日：1999-05-28
申请号：JP30874197
申请日：1997-11-11
申请人： NIPPON KOKAN KK
发明人： ONO YOSHIMI , SUZUKI NOBUHISA , KATO AKIHIKO , YOSHIKAWA MASAKI
IPC分类号： F16L55/00
摘要： PROBLEM TO BE SOLVED: To easily mount a breaking arrester for a joining pipe on a piping, suppress generation of cracking on the piping caused by external force by mounting the arresters on both sides of a pipe axial direction holding a circumference welding part of the piping, to prevent high speed ductile breaking generated in all regions in the axial direction of a steel pipe. SOLUTION: A pair of two ring shaped arresters 12 are arranged on an outer surface side on a pipe body 11 holding a circumference welding part M for connecting both pipe bodies 11. The arrester 12 is made of the same material in the case where the pipe body 11 is made of a steel pipe, for example, it is made of soft steel, high tension steel, or the like. In the arrester 12, an insert layer 12b may be arranged on the inner surface of the arrester main body 12a, and is made of thermoplastic resin. The thickness of the insert layer 12b is set according to a thickness and size of the pipe body 11, a gap between the inner surface of the arrester main body 12a and an outer surface of the pipe body 11 is filled by extrusion pressure of resin when the insert layer 12b is expanded by means of welding heat, and thereby, the arrester 12 is mounted on the pipe body 11.

4. 发明专利

JPH03149484A SLIP TYPE ANTI-LIQUEFACTION PIPE 失效
公开(公告)号：JPH03149484A
公开(公告)日：1991-06-26
申请号：JP28796889
申请日：1989-11-07
申请人： NIPPON KOKAN KK
发明人： TANIMURA MASATO , SAWARA NORITAKA , SUZUKI NOBUHISA
IPC分类号： F16L9/00
摘要： PURPOSE:To avoid damage such as buckling in a main pipe by interposing a frictional-force reducing material layer between the main pipe and its outer sheath in a free state, and by bringing the outer sheath into contact with the surrounding ground, so that when the ground is liquefied, the frictional force can be reduced by the slip of the outer sheath to the main pipe. CONSTITUTION:An outer sheath 2 is applied to the main pipe 1 of a pipeline, and a frictional-force reducing material layer 3 continuously wound is interposed between the main pipe 1 and the outer sheath 2 in a free state. The outer sheath 2 is laid in such a state that it is brought into contact with the surrounding ground, and if a liquefaction layer 13 of the ground flows, the outer sheath 2 slips on the main pipe 1, and the frictional force due to the compression and tension of the ground in the axial direction of the pipe can be reduced. As a result, damage such as buckling and break due to the liquefaction of the ground can be sufficiently prevented, enabling significant reduction in the period and cost of construction.

5. 发明专利

JPS5817914B2 失效
公开(公告)号：JPS5817914B2
公开(公告)日：1983-04-09
申请号：JP11752178
申请日：1978-09-26
申请人： NIPPON KOKAN KK
发明人： SUZUKI NOBUHISA , NAKAJIMA TAKASHI
IPC分类号： F16L1/024 , E02D27/46

6. 发明专利

JPS5544161A BURIED PIPE SUPPORTING METHOD FOR COUNTERMEASURE OF GROUNDDSUBSIDENCE 失效
公开(公告)号：JPS5544161A
公开(公告)日：1980-03-28
申请号：JP11752178
申请日：1978-09-26
申请人： NIPPON KOKAN KK
发明人： SUZUKI NOBUHISA , NAKASHIMA TAKASHI
IPC分类号： F16L1/024 , E02D27/46

7. 发明专利

JP2003177067A METHOD AND APPARATUS FOR ANALYZING EARTHQUAKE RESISTING STRENGTH OF PIPING NETWORK 审中-公开
公开(公告)号：JP2003177067A
公开(公告)日：2003-06-27
申请号：JP2001378528
申请日：2001-12-12
申请人： TOKYO GAS CO LTD , NIPPON KOKAN KK
发明人： SHIMIZU YOSHIHISA , KOGANEMARU KENICHI , HOSOKAWA NAOYUKI , SUZUKI NOBUHISA
IPC分类号： G01L1/00 , G01L5/00 , G06F17/50
摘要： PROBLEM TO BE SOLVED: To provide a method and an apparatus for analyzing the earthquake resisting strength of a piping network capable of obtaining the earthquake resisting strength of the piping network, etc., as theoretically concrete and accurate data not by a theory of probability but by a technique of structural mechanics or material mechanics and executing simple analytical techniques in a short time. SOLUTION: An earthquake resisting strength analyzing part 200 regards total three unit elements of the piping, an rectilinear element and two boundary elements of both ends of the rectilinear element, as constituting one base element, makes the individual base elements of the piping network discrete, and analyzes the individual base elements on at least one type of displacement, distortion, and stress which occur due to vibrations and external forces caused by earthquakes. At this time, corresponding types of data are read and used for data on the deformation characteristics of the boundary elements from among data previously obtained by an infinite element method, formed into a database, and stored in a boundary element database storage part 100. COPYRIGHT: (C)2003,JPO

8. 发明专利

JP2002194436A METHOD FOR PRODUCING STEEL PIPE HAVING EXCELLENT BUCKLING RESISTANCE 失效
公开(公告)号：JP2002194436A
公开(公告)日：2002-07-10
申请号：JP2000400635
申请日：2000-12-28
申请人： NIPPON KOKAN KK
发明人： ENDO SHIGERU , ISHIKAWA NOBUYUKI , SUZUKI NOBUHISA , KONDO JO
IPC分类号： C21D9/08 , C21D9/50 , C22C38/00 , C22C38/04 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a steel pipe in which local buckling is hardly caused by compression and bending stress acted in the axial direction in case of a big earthquake and in the laying of a submarine pipe, and which is suitable for gas pipelines, water piping, the columns of civil engineering and construction or the like. SOLUTION: A steel sheet obtained by hot rolling steel having a composition containing, by mass%, 0.03 to 0.15% C, 0.05 to 0.5% Si and 1 to 2% Mn, and the balance substantially Fe, and in which PCM shown by the following formula (1) satisfies 0.10 to 0.20 is made into a steel pipe by cold or hot forming. After that, the steel pipe is reheated at 800 deg.C to 1,100 deg.C. Successively, the steel pipe is cooled at a cooling rate of >=5 deg.C/sec. In this way, the steel pipe in which the stress ratio (σr) as a ratio between the yield strength in the axial direction of the pipe and the stress in the case the nominal strain is 1.5% (σ1.5) is >=1.05, or the stress ratio (σr) as a ratio between the yield strength in the circumferential direction of the steel pipe and in the axial direction of the pipe and stress in the case the nominal strain is 1.5% (σ1.5) is >=1.05, and having excellent buckling resistance is produced: PCM=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5xB (1).

9. 发明专利

JP2001141144A BELL-AND-SPIGOT JOINT 失效
公开(公告)号：JP2001141144A
公开(公告)日：2001-05-25
申请号：JP32011299
申请日：1999-11-10
申请人： NIPPON KOKAN KK
发明人： ONO YOSHIMI , SUZUKI NOBUHISA
IPC分类号： F16L21/02
摘要： PROBLEM TO BE SOLVED: To mechanically join the end of a pipe by inserting the end of the pipe for a bell-and-spigot joint into the bell-and-spigot joint, in installation of a steel pipe to be buried underground. SOLUTION: An inside diameter contraction part 2a with the inside diameter gradually contracted toward and end face 1a is formed on a joint end part 2 of the joint body 1 of this bell-and-spigot joint A. The joint body 1 further comprises a parallel part 3 having the inside diameter equal to the maximum inside diameter of the inside diameter contraction part 2a, a parallel part 5 via a stepped part 4, an inside diameter contraction part 6 with the inside diameter gradually contracted toward a center side, and a parallel part 7 having the inside diameter equal to the minimum inside diameter of the inside diameter contraction part 6. A seal member 9 is joined with a stopper member 8 and a position keeping member 10, and these three members are connected to and integrated with each other. Sealability of the joint part can be ensured even when the compressive displacement or the tensile displacement in the axial direction of a pipe B for the bell-and-spigot joint having a covering layer 12 are generated in an outer surface of a main pipe 11.

10. 发明专利

JP2001141142A BELL-AND-SPIGOT JOINT, AND JOINT STRUCTURE OF PIPE THEREFOR 失效
公开(公告)号：JP2001141142A
公开(公告)日：2001-05-25
申请号：JP32011399
申请日：1999-11-10
申请人： NIPPON KOKAN KK , DDI CORP
发明人： ONO YOSHIMI , SUZUKI NOBUHISA , UCHIDA HIDEKAZU , HONMA TAKESHI
IPC分类号： F16L21/00
摘要： PROBLEM TO BE SOLVED: To insert an end of a pipe for a bell-and-spigot joint into the pipe in the bell-and-spigot joint, and mechanically join the end of the pipe with the bell-and-spigot joint in installation of a steel pipe to be buried underground. SOLUTION: A coated layer 12 is formed on an outer circumferential surface of a main pipe 11, and a stopper ring 101 is fitted to an outer surface of the coated layer 12. The outside diameter of the stopper ring 101 is larger than the inside diameter of an end face 1a of a joint body 1. The length (2) in the axial direction of the allowable insertion at the bell-and-spigot joint A is larger than the length (1) (joint insertion) in the axial direction between the end face 11a of the main pipe and the stopper ring 101a ((1)

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