A vertically displaceable assembled foundation
A vertical displacement, prefabricated technology, applied in infrastructure engineering, construction, etc., can solve the problem of increased cost of lines in heavy/medium ice areas, and achieve the effect of improving the ability to resist ice disasters and convenient on-site installation.
Active Publication Date: 2019-06-04
CEEC JIANGSU ELECTRIC POWER DESIGN INST CO LTD
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Embodiment 1
[0039] 1. The design method of the prefabricated foundation with vertical displacement, including the following steps:
[0040] 1) Basic design for pullout and compression resistance
[0041] Determine the foundation reaction force of the tower, and determine the type and size of the foundation according to the "Technical Regulations for Design of Foundation Design for Overhead Transmission Lines" (DL / T 5219-2014) for the overall pullout and compression design of the foundation.
[0042] 2) Local compression check calculation of prefabricated columns
[0043] According to the "Code for Design of Concrete Structures" (GB50010-2010), the local compression calculation of the connection area between the precast column and the foundation is carried out to determine the size of the precast column.
[0044] 3) Tension unreleased bearing capacity design
[0045] When the tension is not released, the prefabricated column does not separate from the foundation, and the formula (1) must...
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The invention discloses a fabricated foundation with a vertical displacement function. The fabricated foundation comprises a prefabricated column, pre-embedded steel plates, pre-stressed tendons and rubber, wherein the prefabricated column is pre-embedded in the foundation; the space between the prefabricated column and the foundation is filled with the rubber; the pre-embedded steel plates comprise a pre-embedded tensile steel plate and a pre-embedded shear-resistant steel plate; a tower foot plate is arranged at the top end of the prefabricated column; the pre-embedded tensile steel plate is arranged at the bottom end of the prefabricated column; the pre-embedded shear-resistant steel plate is connected with the periphery of the bottom of the prefabricated column; the pre-stressed tendons penetrate through the tower foot plate, the prefabricated column and the pre-embedded tensile steel plate in sequence from top to bottom; and then, the tower foot plate and the pre-embedded tensile steel plate are fastened on the prefabricated column. The fabricated foundation has the advantages that when the line ice-coating thickness exceeds the design value, the grounding line unbalanced tension can be released and the line ice-disaster resistance can be improved; after the ice coating is eliminated, a tower foot can be restored to the original position under the action of high-strength unbonded pre-stressed steel strands, and a pole tower needs not be maintained again; and a prefabricated structure is adopted for the design of the fabricated foundation, so that the fabricated foundation is convenient to mount on site.
Description
technical field [0001] The invention relates to a vertically displaceable assembled foundation, in particular to a vertically displaceable assembled foundation for power transmission line foundations in heavy / medium ice areas. When the ice thickness exceeds the design bearing capacity of the tower, the unbalanced tension of the ground wire can be released by lifting the tower foot. Background technique [0002] Transmission line is an important lifeline project, and the collapse of transmission towers caused by ice disasters has occurred many times, which has brought great harm to the society. According to the post-disaster investigation of rain, snow and freezing disasters in 2008, about 90% of tower collapses in ice disasters were caused by longitudinal unbalanced tension caused by uneven ice coating and deicing. [0003] Icing of ground conductors on transmission lines is a non-uniform load along the length of the line. As the thickness of the ice coating increases, the...
Claims
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IPC IPC(8): E02D27/42
CPCE02D27/42
Inventor 贾振宏宁帅朋谈磊吕健龙海波杨明余亮李宁杨云郭昊罗琨仇高飞周昊战龙龙汤鹏张庆唐磊凤良吴勇陈诚
Owner CEEC JIANGSU ELECTRIC POWER DESIGN INST CO LTD