Stepped large raft construction technology

Abstract

The invention discloses a stepped large raft construction technology which comprises the following steps: (1) construction preparation; (2) expert argumentation; (3) location setting out; (4) excavation of a foundation pit; (5) manual bottom cleaning; (6) bottom sealing of the foundation pit; (7) arrangements of a lower-step steel bar cage, lower-step inserted barrel steel bars and lower-step embedded parts; (8) installation of lower-step condenser pipes and lower-step temperature measuring lines; (9) lower-step concealed work acceptance; (1) lower-step concrete pouring; (11) lower-step concrete curing and temperature measurement; (12) arrangements of an upper-step steel bar cage, upper-step inserted barrel steel bars and upper-step embedded parts; (13) installation of upper-step condenser pipes and upper-step temperature measuring lines; (14) installation of an upper-step formwork; (15) upper-step concrete pouring; and (16) upper-step concrete curing and temperature measurement. The stepped large raft construction technology is stable, safe and reliable, ensures safe and fast construction, omits secondary erection of formwork supports, reduces the concrete curing cost, the labor cost and other related costs, shortens the construction period, and accelerates the construction progress.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a step-down large raft construction technology. Background technique [0002] Residential buildings, office buildings and other civil buildings in cities in our country are increasingly adopting high-rise and super high-rise structures. In the position of the elevator shaft, as the underground building gets deeper and deeper, the thickness of the raft foundation becomes larger and larger, and the number of layers of the raft changes from one layer to two or more layers. The total depth is generally ≥4m, the raft thickness is ≥1.5m, and the pit depth is ≥3m. Shaped like a gutter or pool. Whether it is formwork support, steel bar binding, support, pouring of mass concrete, control of temperature difference between inside and outside of concrete, and maintenance quality, the raft foundation is not easy to do well, and it is prone to quality defects or safety hazards such as te...

AI Technical Summary

Problems solved by technology

Whether it is formwork support, steel bar binding, support, pouring of mass concrete, control of temperature difference between inside and outside of concrete, and maintenance quality, the raft foundation is not easy to do well, and it is prone to quality defects or safety hazards such as temperature cracks and mold explosion.

At present, there is no complete and systematic construction method for quality and safety measures in this area.

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