Manually excavated pedestal pile construction method based on freezing process

Abstract

The invention provides a manually excavated pedestal pile construction method based on a freezing process. The construction method comprises the steps of (1) forming peripheral freezing holes in the plane of a pile foundation and mounting peripheral freezing pipes in the peripheral freezing holes, (2) starting to freeze the peripheral freezing pipe to form a peripheral water stop frozen wall, (3) performing manually excavated pedestal pile construction within the plane of the pile foundation under the water stopping effect of the peripheral water stop frozen wall, and (4) stopping freezing the peripheral freezing pipes and pulling out the peripheral freezing pipes. According to the construction method, manual excavation is performed after the frozen wall is formed by use of a freezing technique; the pile peripheral frozen wall is capable of temporarily supporting wall protecting linings such as bricks and concrete; compared with the traditional wall protecting linings, the pile peripheral frozen wall can be formed once, the steps of fabricating, transporting and mounting the traditional wall protecting linings and the like are avoided, and the pile hole forming speed is high; the formation of the pile peripheral frozen wall is capable of greatly reducing the probability of safety accidents such as soil layer collapse, sand drifting and mud rush-out during manual excavation, and therefore, the safety of the constructors can be improved.

Description

technical field [0001] The invention belongs to the technical field of construction methods in the construction industry, and in particular relates to a construction method for manually digging holes and expanding bottom piles based on a freezing method. Background technique [0002] The manual excavation pile is suitable for various strata where the bearing layer is above the groundwater level. The pile diameter is generally about 800-2000mm. It is a large-diameter pile. Its main advantages are as follows: 1. 2. The construction process has no noise, no vibration, and no impact of soil extrusion. It is a non-extrusion soil pile; 3. It is convenient for quality inspection, and the quality of the pile is easier to control and maintain. Guarantee; 4. The construction method and equipment used are simple, the earthwork is easy to handle, and multiple piles can be constructed at the same time. Therefore, artificially excavated cast-in-situ piles have been widely used, especiall...

AI Technical Summary

Problems solved by technology

[0003] However, the manual excavation of cast-in-place piles also has the following main disadvantages: 1. When the bearing layer is below the groundwater level, it is difficult to form holes, especially in the working condition with a thick quicksand layer; Then need to input a large amount of labor force, labor shortage then seriously delays the construction period; 3, operation safety is poor, easily produces safety accident when manually digging deep piles or underground toxic gas; reliable

The above shortcomings have greatly restricted the use of artificial excavated cast-in-place piles in strata with relatively high groundwater levels and places with strict artificial safety requirements, hindering their further popularization and application.

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