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公开(公告)号：US08882944B2
公开(公告)日：2014-11-11
申请号：US13913583
申请日：2013-06-10
Applicant: Kurosawa Construction Co., Ltd.
Inventor： Ryohei Kurosawa , Kei Hirai , Naoki Matsubara
CPC classification number: C09D5/08 , B05D1/06 , B05D7/20 , D07B7/145 , D07B7/185 , D07B2201/2012 , D07B2201/2023 , D07B2201/2059 , D07B2201/2065 , D07B2205/206 , D07B2207/4059 , D07B2207/4068 , D07B2401/2025 , D07B2501/2023 , E04C5/015 , E04C5/08 , Y10T29/49194 , Y10T29/49224 , D07B2801/12 , D07B2801/18 , D07B2801/60
Abstract: In a method for forming a rustproof film on a PC strand, the thickness of the resin film is set to 200±80 μm, the pre-heating is performed within a temperature range from 60 to 150° C. to prevent an occurrence of a cob-webbing phenomenon as a result of melting of the synthetic resin powder coating material and the post-heating is performed within a range from 150 to 250° C. in order to uniformize the thickness of the coats adhered to the outer peripheral surfaces of the core wire and the surrounding wires, and the temperature of the pre-heating is set to be lower than the temperature of the post-heating, and the synthetic resin powder coating material including particles having diameters in a range from 0.1 to 250 μm is used, and the line speed in the series of steps is set to 5 to 10 m/min.
Abstract translation: 在PC链上形成防锈膜的方法中，将树脂膜的厚度设定为200±80μm，预热在60〜150℃的温度范围内进行，以防止发生 由于合成树脂粉末涂料的熔化和后加热，在150-250℃的范围内进行丝网织带现象，以使粘附在外层表面上的涂层的厚度均匀化 芯线和周围的线，并且预热的温度被设定为低于后加热的温度，并且使用包括直径在0.1至250μm范围内的粒子的合成树脂粉末涂料 ，一系列步骤中的线速度设定为5〜10m / min。
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2.发明授权公开(公告)号：US11352790B2
公开(公告)日：2022-06-07
申请号：US16950846
申请日：2020-11-17
Applicant: KUROSAWA CONSTRUCTION CO., LTD.
Inventor： Ryohei Kurosawa
Abstract: There is provided a method of introducing prestress into a beam-column joint of PC construction to make it into a triaxially compressed state, in which the beam-column joint is made into a triaxial compression state and reasonable prestress is introduced into cross section areas of the ends of the members forming the beam-column joint.
A tensile introducing force is generated by tensionally anchoring PC cables passed through the beam-column joint to introduce prestresses into the cross section areas of the ends of the members forming the beam-column joints in respective axial directions to make triaxial compression state, to satisfy the following conditions (1) and (2): (1) no tensile strength is generated, with respect to long term design load, in cross-section areas of the members forming the end of the beam and the end of the column, which ends are in contact with the beam-column joint; and (2) upon occurring of extremely large scale earthquake (very rarely occurred earthquake), in the beam-column joint, no generation of diagonal cracks is allowed to be generated but diagonal tensile stress intensity caused due to shear force inputted by seismic load is made less than allowable tensile stress intensity of concrete.-
公开(公告)号：US11111664B2
公开(公告)日：2021-09-07
申请号：US16897267
申请日：2020-06-10
Applicant: KUROSAWA CONSTRUCTION CO., LTD.
Inventor： Ryohei Kurosawa
Abstract: There is provided a method of prestressing a beam-column joint with an appropriate ratio among the magnitudes of compression in the directions of X, Y, and Z axes. The method introduces prestress in a beam-column joint with a tensile introducing force generated by tensionally anchoring prestressing tendons that are arranged in PC beams extending along two horizontal directions (or X axis and Y axis) and PC columns extending along the vertical direction (or Z axis) and passed through the beam-column joint to bring the beam-column joint in triaxial compression, the prestress being introduced such that a diagonal tensile force T generated by an input shear force due to a seismic load of an extremely great earthquake that may occur very rarely will be cancelled completely or partially so as not to allow diagonal cracks to occur. The ratio of the prestresses introduced in the directions of the respective axes satisfies the following equation (1): σx:σy:σz=1:1:0.3−0.9 (1) where σx, σy, and σz are prestresses introduced in the directions of the X axis, the Y axis, and the Z axis respectively.
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公开(公告)号：US20210079643A1
公开(公告)日：2021-03-18
申请号：US16897267
申请日：2020-06-10
Applicant: KUROSAWA CONSTRUCTION CO., LTD.
Inventor： Ryohei KUROSAWA
Abstract: There is provided a method of prestressing a beam-column joint with an appropriate ratio among the magnitudes of compression in the directions of X, Y, and Z axes. The method introduces prestress in a beam-column joint with a tensile introducing force generated by tensionally anchoring prestressing tendons that are arranged in PC beams extending along two horizontal directions (or X axis and Y axis) and PC columns extending along the vertical direction (or Z axis) and passed through the beam-column joint to bring the beam-column joint in triaxial compression, the prestress being introduced such that a diagonal tensile force T generated by an input shear force due to a seismic load of an extremely great earthquake that may occur very rarely will be cancelled completely or partially so as not to allow diagonal cracks to occur. The ratio of the prestresses introduced in the directions of the respective axes satisfies the following equation (1): σx:σy:σz=1:1:0.3−0.9 (1) where σx, σy, and σz are prestresses introduced in the directions of the X axis, the Y axis, and the Z axis respectively.
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5.发明授权Method of forming corrosion protection double coatings on prestressing strand and prestressing strand produced by the method 有权在该方法制备的预应力股和预应力股上形成防腐双层涂层的方法公开(公告)号：US07241473B2
公开(公告)日：2007-07-10
申请号：US10865884
申请日：2004-06-14
Applicant: Takeshi Hasui , Takatsugu Fujikawa
Inventor： Takeshi Hasui , Takatsugu Fujikawa
CPC classification number: E04C5/08 , D07B1/0693 , D07B7/145 , D07B7/185 , D07B2201/201 , D07B2201/2012 , D07B2201/2013 , D07B2501/2023 , Y10T428/2933 , Y10T428/2936 , Y10T428/2938 , Y10T428/294 , Y10T428/2947
Abstract: To improve tensile strength without impairing flexibility and adhesion to concrete, and to form a thick coating in a surface layer part for preventing a basis material from being exposed by damage to the coating, a method of forming double coatings on a prestressing strand includes a primary painting process after a pre-treatment process, in which a resin coating is formed only at the surface layer, a secondary painting process in which respectively individual state resin coating is formed on an outer peripheral face of each of the core wire and surrounding wires under a loosened and separated state, thereby forming a double coating for each surrounding wire, and a finishing process of tightening and retwisting the surrounding wires about the core wire to an original state. The obtained prestressing strand has the double coating portions only at the surface layer and sufficient flexibility and adhesion to concrete.
Abstract translation: 为了提高拉伸强度而不损害对混凝土的柔软性和粘合性，并且为了防止基材受到涂层的损害而在表面层部分形成厚的涂层，在预应力股线上形成双层涂层的方法包括： 在仅在表层形成树脂涂层的预处理工艺之后的涂漆工艺，在每个芯线和围绕的线的外周面上分别形成各自的状态树脂涂层的二次涂漆工艺 松弛和分离状态，从而形成用于每个周围的线的双重涂层，以及将围绕芯线的周围的线紧固并重新卷绕到原始状态的精加工过程。 所获得的预应力股仅在表面层具有双重涂层部分，并具有足够的柔韧性和对混凝土的粘合性。
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Patent Agency Ranking
公开(公告)号：US11377841B2
公开(公告)日：2022-07-05
申请号：US17117056
申请日：2020-12-09
Applicant: KUROSAWA CONSTRUCTION CO., LTD.
Inventor： Ryohei Kurosawa
Abstract: A structure enables free and reasonable designing of a cross section of an end of a steel beam in accordance with bending stress and a housed state of a PC steel, thereby providing an economic and reasonable building as a whole. A beam end block includes end plates and an anchor plate. The end plates are fixed at an end surface of an H-section steel in a direction substantially perpendicular to the longitudinal direction of the beam. The anchor plate is fixed to the H-section steel separately from the end plates, on a side opposite to a column, in a direction substantially perpendicular to the longitudinal direction of the beam. An end of the steel beam has an upper part and a lower part. The upper part protrudes toward the column more than the lower part and is mounted on a cogging. The beam end block has a height dimension larger than the height dimension of the H-section steel and has a lower end that is disposed at substantially the same height as a lower end of a side surface of the cogging facing the lower part of the end of the steel beam.
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公开(公告)号：US20210198887A1
公开(公告)日：2021-07-01
申请号：US17117056
申请日：2020-12-09
Applicant: KUROSAWA CONSTRUCTION CO., LTD.
Inventor： Ryohei KUROSAWA
Abstract: A structure enables free and reasonable designing of a cross section of an end of a steel beam in accordance with bending stress and a housed state of a PC steel, thereby providing an economic and reasonable building as a whole. A beam end block includes end plates and an anchor plate. The end plates are fixed at an end surface of an H-section steel in a direction substantially perpendicular to the longitudinal direction of the beam. The anchor plate is fixed to the H-section steel separately from the end plates, on a side opposite to a column, in a direction substantially perpendicular to the longitudinal direction of the beam. An end of the steel beam has an upper part and a lower part. The upper part protrudes toward the column more than the lower part and is mounted on a cogging. The beam end block has a height dimension larger than the height dimension of the H-section steel and has a lower end that is disposed at substantially the same height as a lower end of a side surface of the cogging facing the lower part of the end of the steel beam.
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公开(公告)号：US08833050B2
公开(公告)日：2014-09-16
申请号：US13740526
申请日：2013-01-14
Applicant: Kurosawa Construction Co., Ltd.
Inventor： Ryohei Kurosawa , Kei Hirai
CPC classification number: D07B1/02 , D07B1/0693 , D07B7/185 , D07B2201/2006 , D07B2201/2011 , D07B2201/2012 , D07B2201/2013 , D07B2201/2044 , D07B2201/2046 , D07B2201/2051 , D07B2201/2059 , D07B2201/2065 , D07B2205/306 , D07B2205/3064 , D07B2205/3067 , D07B2205/3071 , D07B2207/404 , D07B2207/4059 , D07B2301/10 , D07B2301/45 , D07B2401/2025 , D07B2501/2023 , D07B2801/12 , D07B2801/18 , D07B2801/60
Abstract: A double rustproof PC strand has superior durability and semi-permanent rustproof performance. A core wire and surrounding wires are formed of wires subjected to a wire drawing treatment and a plating treatment to be formed with a plated layer. A rustproof treatment is applied by forming a synthetic resin coat on an outer peripheral surface thereof. In order to uniformize and regulate the twisting pitch, the core wire and the surrounding wires are adjusted under the conditions of: (A) Diameter of CORE: 4.42±0.05 mm, Diameter of Surrounding wire: 4.25±0.05 mm, (B) Diameter of CORE: 5.22±0.05 mm, Diameter of Surrounding wire: 5.06±0.05 mm, or (C) Diameter of CORE: 5.40±0.05 mm, Diameter of Surrounding wire: 5.25±0.05 mm, and then twisted, and the tensile strength is 1850 N/mm2 or higher.
Abstract translation: 双防锈PC线具有优异的耐久性和半永久性防锈性能。 芯线和周围线由经过拉丝处理和电镀处理的电线形成，以形成镀层。 通过在其外周面上形成合成树脂涂层来进行防锈处理。 为了均匀化和调节扭转间距，芯线和周围线条的调整条件为：（A）直径CORE：4.42±0.05 mm，周围线直径：4.25±0.05 mm，（B）直径 的CORE：5.22±0.05mm，周围线直径：5.06±0.05mm，或（C）CORE直径：5.40±0.05mm，周围线直径：5.25±0.05mm，然后扭曲，拉伸强度为 1850 N / mm2或更高。
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9.发明授权
公开(公告)号：US5362326A
公开(公告)日：1994-11-08
申请号：US45865
申请日：1993-04-14
Applicant: Takeshi Hasui , Takatsugu Fujikawa
Inventor： Takeshi Hasui , Takatsugu Fujikawa
IPC: B05C9/14 , B05C13/02 , B05C19/00 , B05D7/20 , D07B7/14 , D07B7/18 , E04C5/01 , E04C5/08 , B05C13/00
CPC classification number: D07B7/145 , D07B7/185 , D07B2201/2012 , D07B2201/2059 , D07B2201/2065 , D07B2207/4059 , D07B2401/2025 , D07B2501/2023 , Y10S118/22
Abstract: Disclosed is a method of forming corrosion protection coatings on prestressing strands. It comprises the steps of untwisting sequential lengths of a prestressing strand; keeping the surrounding steel wires apart from the core steel wire to coat these steel wires with a synthetic resin; and twisting the coated steel wires to provide a prestressing strand of the original shape, thus permitting the separate coating of each steel wire, leaving, on the prestressing strand surface, the helical dent as deep and wide as the noncoated prestressing strand to assure the bond of the twisted wire to the surrounding concrete as firm as the noncoated prestressing strand. Also, an apparatus for carrying out such coating method is disclosed.
Abstract translation: 公开了一种在预应力股线上形成防腐蚀涂层的方法。 它包括解捻预应力股的顺序长度的步骤; 将周围钢丝与芯钢丝分开，用合成树脂涂覆钢丝; 并且扭绞涂覆的钢丝以提供原始形状的预应力股线，从而允许每个钢丝线的单独涂覆，在预应力股线表面上留下与未涂覆的预应力股一样深和宽的螺旋形凹痕，以确保结合 的扭绞线到周围的混凝土，如同未涂覆的预应力股一样牢固。 另外，公开了一种用于进行这种涂布方法的设备。
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10.发明申请公开(公告)号：US20210189726A1
公开(公告)日：2021-06-24
申请号：US16950846
申请日：2020-11-17
Applicant: KUROSAWA CONSTRUCTION CO., LTD.
Inventor： Ryohei KUROSAWA
Abstract: There is provided a method of introducing prestress into a beam-column joint of PC construction to make it into a triaxially compressed state, in which the beam-column joint is made into a triaxial compression state and reasonable prestress is introduced into cross section areas of the ends of the members forming the beam-column joint.
A tensile introducing force is generated by tensionally anchoring PC cables passed through the beam-column joint to introduce prestresses into the cross section areas of the ends of the members forming the beam-column joints in respective axial directions to make triaxial compression state, to satisfy the following conditions (1) and (2): (1) no tensile strength is generated, with respect to long term design load, in cross-section areas of the members forming the end of the beam and the end of the column, which ends are in contact with the beam-column joint; and (2) upon occurring of extremely large scale earthquake (very rarely occurred earthquake), in the beam-column joint, no generation of diagonal cracks is allowed to be generated but diagonal tensile stress intensity caused due to shear force inputted by seismic load is made less than allowable tensile stress intensity of concrete.
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