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A platform for research: civil engineering, architecture and urbanism
Large-section cast-in-place concrete prestress control method
The invention discloses a large-section cast-in-place concrete prestress control method which comprises the following steps: controlling a batch method of prestress tension and tension force, and just balancing the dead weight of concrete by initial tension prestress, so that the inverted arch of a concrete structure is zero, and long-term creep deformation beyond design is eliminated; according to engineering characteristics, concrete strength, elastic modulus and an initial tensioning value obtained after design checking and calculation are determined in advance, the concrete strength control range during initial tensioning is 35%-50% of design strength, the corresponding elastic modulus is 40%-50% of a design final value, concrete strength control is used as a main part during initial tensioning, elastic modulus control is used as an auxiliary part during initial tensioning, and the initial tensioning value of the initial tensioning value is 40%-50% of the design final value. The section of the prestressed concrete beam is uniformly pressed as much as possible through initial tensioning; the method has very strong applicability to control of the prestress of the concrete, is very beneficial to prolonging the service life of the prestressed concrete, and has very strong popularization and application prospects.
本发明公开了一种大截面现浇混凝土预应力控制方法，包括：控制预应力张拉的分批方法以及张拉力，以初张拉预应力刚好平衡混凝土自重，使混凝土结构反拱为零，消除设计之外的长期徐变变形；根据工程特点，预先确定好具体的初张拉时的混凝土强度、弹性模量，以及经设计检算的初张拉值，初张拉时混凝土的强度控制范围为35％～50％的设计强度，相应的弹性模量按设计终值的40％～50％，初张拉时以混凝土强度控制为主、弹性模量控制为辅，初张拉应尽量使预应力混凝土梁断面均匀受压；本发明对混凝土预应力的控制具有很强的适用性，对提高预应力混凝土的使用寿命十分有利，具有极强的推广应用前景。
Large-section cast-in-place concrete prestress control method
The invention discloses a large-section cast-in-place concrete prestress control method which comprises the following steps: controlling a batch method of prestress tension and tension force, and just balancing the dead weight of concrete by initial tension prestress, so that the inverted arch of a concrete structure is zero, and long-term creep deformation beyond design is eliminated; according to engineering characteristics, concrete strength, elastic modulus and an initial tensioning value obtained after design checking and calculation are determined in advance, the concrete strength control range during initial tensioning is 35%-50% of design strength, the corresponding elastic modulus is 40%-50% of a design final value, concrete strength control is used as a main part during initial tensioning, elastic modulus control is used as an auxiliary part during initial tensioning, and the initial tensioning value of the initial tensioning value is 40%-50% of the design final value. The section of the prestressed concrete beam is uniformly pressed as much as possible through initial tensioning; the method has very strong applicability to control of the prestress of the concrete, is very beneficial to prolonging the service life of the prestressed concrete, and has very strong popularization and application prospects.
本发明公开了一种大截面现浇混凝土预应力控制方法，包括：控制预应力张拉的分批方法以及张拉力，以初张拉预应力刚好平衡混凝土自重，使混凝土结构反拱为零，消除设计之外的长期徐变变形；根据工程特点，预先确定好具体的初张拉时的混凝土强度、弹性模量，以及经设计检算的初张拉值，初张拉时混凝土的强度控制范围为35％～50％的设计强度，相应的弹性模量按设计终值的40％～50％，初张拉时以混凝土强度控制为主、弹性模量控制为辅，初张拉应尽量使预应力混凝土梁断面均匀受压；本发明对混凝土预应力的控制具有很强的适用性，对提高预应力混凝土的使用寿命十分有利，具有极强的推广应用前景。
Large-section cast-in-place concrete prestress control method
一种大截面现浇混凝土预应力控制方法
HUANG JINZHAN (author) / YANG HONGJIE (author) / WEN SHENG (author) / XIANG SHENG (author)
2022-12-16
Patent
Electronic Resource
Chinese
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