Method for constructing large raft foundation under high temperature

Abstract

Provided is a method for constructing a large raft foundation under high temperature. The method includes: dividing the raft foundation into a plurality of small blocks to form 'separated cabins'; arranging a groove type construction seam in the middle of the thickness direction of a construction seam of the raft foundation; overlaying a layer of geotechnical cloth on a plain concrete cushion layer; overlaying a layer of polyvinyl chloride (PVC) waterproof roll materials on the geotechnical cloth; smearing a mortar leveling layer on the PVC waterproof roll materials; arranging a rubber waterstop on the construction seam; overlaying a horizontal grouting tube and a vertical grouting tube on the rubber waterstop; after construction of the groove and waterproof design of the construction seam is finished, pouring small blocks of concrete, maintaining for 7 days, and constructing on one side or the periphery of the poured raft foundation with the cabin divided into small blocks in a comprehensively forwarding mode. By means of the method, no seam can be generated, the contradiction on waterproof construction and raft foundation concrete pouring caused by the construction method of 'blocked pouring' which means pouring a block and reserving a block can be overcome, the using efficiency of machines is improved, and the working period is shortened.

Description

technical field [0001] The invention belongs to the technical field of civil construction, and in particular relates to a construction method of "dividing the cabin and pouring joint warehouses" for a super-large-area integral raft reinforced concrete foundation under high temperature conditions. Background technique [0002] With the utilization of underground space by human beings, the basement reinforced concrete raft foundation is getting bigger and bigger, and there are more and more 200m×200m reinforced concrete raft foundations. For such a large reinforced concrete raft foundation, under the condition that no post-cast belt and construction joints are set in the design drawings, the construction site has a dry climate, an annual average temperature of 41 °C, a maximum temperature of 52 °C, and a maximum temperature difference of 20 °C between day and night. Appropriate construction methods are particularly important, otherwise, the following problems will occur: 1. Un...

AI Technical Summary

Problems solved by technology

For such a large reinforced concrete raft foundation, under the condition that no post-cast belt and construction joints are set in the design drawings, the construction site has a dry climate, an annual average temperature of 41 °C, a maximum temperature of 52 °C, and a maximum temperature difference of 20 °C between day and night. Appropriate construction methods are particularly important, otherwise, the following problems will occur: 1. Under the condition of large-scale reinforced concrete raft foundation in high temperature environment, if the post-cast belt and construction joints are not set, if the overall pouring is adopted, temperature, Shrinkage cracks; at the same time, it will also affect the construction arrangement

2. The adoption of the "block jumping method" has an impact on the simultaneous parallel operation of concrete pouring and waterproof construction for large-scale reinforced concrete raft slab foundations

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