4) When the skip construction method is adopted, it must strictly comply with and meet the relevant specification requirements
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The adjacent two sections shall be filled and poured into a whole with an interval of no less than 7 days, and shall be planned in blocks, constructed in blocks, poured in layers and formed as a whole“ By ‘playing checkers’ on the concrete, we can effectively avoid the fierce temperature difference and dry shrinkage at the initial stage of concrete construction, and there is no need to leave post pouring belt
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Especially in the xiong’an resettlement housing project with 416 days of ultra-short construction period and ultra-high residential quality, it is absolutely impossible to rely on the “anti” method in traditional concrete pouring, which once made it difficult for Jiang Wei, the project manager of North China company
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its construction joints do not have to be aligned up and down)
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Each layer and foundation floor (including wall) do not have to be in the same span, but can be divided into areas (i.e
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Both sides of the belt adopt reinforcement mesh or steel mesh
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The longitudinal and transverse planes are divided into areas not greater than 40m and numbered along their respective directions
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Its mode is the same as checkers, that is, pouring one section at a time
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It is constructed according to the principle of “block planning, block construction, layered pouring and overall forming”
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The post cast belt can be poured simultaneously when pouring concrete on the top plate, and it shall not be less than 7d
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Based on an engineering example, let’s intuitively understand the process flow of “skip warehouse method”: it is recommended to pay attention.
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1-1 ~ 1-6, at an interval of not less than 7d, and then pour the second batch, i.e
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The specific construction sequence is as follows: pour the first batch, i.e
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2) Reducing construction joints is conducive to controlling cracks and improving project quality
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5) The skip warehouse construction method can also be adopted for the floor slab, which is the same as the foundation slab construction method
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How to “resist” the temperature stress and shrinkage tension of concrete materials during construction is a great challenge for builders
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It is facing the winter construction stage immediately
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After many discussions led by Jiang Wei, the technical breakthrough team of the project decided to adopt the ideas of “resistance and release”, “release first and then resistance” and “resistance first”, make full use of the characteristic principle of “resistance and release” which is easy to release internal stress before the performance of concrete is stable and completely solidified in 5 to 10 days, and boldly adopt the “jump warehouse method” for construction, that is, it is like playing checkers, The overall structure shall be divided into sections according to the construction joints, and each section shall be poured one by one
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The above illustration example is taken as an example: according to the area of foundation raft, it is divided into areas not greater than 40m along the length and width directions, and numbered along their respective directions
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Aim at the “pain point” and force accurately
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In fact, this experience has been obtained in the segmented flow operation in the past
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An 800mm construction post cast belt can also be set along the outer wall 30 ~ 40m
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3) Material saving, green and environmental protection“ The following problems should be paid attention to in the construction of “jump warehouse method”: 1) since the foundation slab belongs to mass concrete, the concrete design strength grade should be C25 ~ C40, and the strength index of 60d or 90d age can be used as the concrete design strength
3) The vault construction method can also be adopted for the basement roof and aboveground floor slab
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In case of infringement, please contact and delete the important livelihood project in xiong’an New Area: the second bid section of the general contracting project for the construction of resettlement houses and supporting facilities in unit a, xiongdong area, xiong’an New Area (xiongdong resettlement house project) contracted by China Construction Second Engineering Bureau, North China company and Luban alliance of construction engineering, and officially enter a new stage of main structure construction! In addition to the scene of hundreds of tower cranes illuminating the night sky, the focus of the project also lies in the “jump warehouse method” construction of the world’s largest resettlement housing project! The project is the largest super long and super wide concrete structure in the world
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2-1 ~ 2-6“ The “jump warehouse method” makes full use of the “resistance and release” characteristic principle that the performance of concrete is not stable during 5 to 10 days and it is easy to release the internal stress before complete solidification
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The interval between two adjacent sections shall not be less than 7 days to avoid severe temperature difference and drying effect in the early stage of concrete construction, so there is no need to leave post cast strip“ Compared with the traditional “post cast strip” construction technology, the “jump warehouse method” has significant advantages: 1) simplify the construction process and speed up the construction progress
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2) The skip warehouse construction method can also be adopted for the outer wall of the basement, and the grid length should not be greater than 40m
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” In an interview with CCTV reporter, Jiang Wei said proudly, “the ‘jump warehouse method’ not only effectively controls concrete cracks, but also speeds up the construction progress, which can shorten the relative construction period by 50 days and the absolute construction period by 20 days.” Extended learning ▼ what is “jump position method”“ Example of “jump BIN method” construction site “jump BIN method” refers to the jump BIN method construction technology of super large volume concrete structure: in the construction of mass concrete structure, in the early stage of high temperature shrinkage stress, the super long concrete block is divided into several small blocks for interval construction, and after short-term stress release, In the later stage with small shrinkage stress, several small blocks are connected as a whole, and the construction method relies on the tensile strength of concrete to resist the temperature shrinkage stress in the next stage“ Example of construction sequence of “jump BIN method” the construction process of “jump BIN method” is simple
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Considering the thin floor slab thickness, the pouring interval can be shortened accordingly
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