Construction method of hand-dug piles

Abstract

The invention discloses a construction method of hand-dug piles. The method comprises the following steps: firstly, making preparation of construction, and making injection tubes and modifying a pneumatic pick; mounting a pneumatic pick head to the pneumatic pick, driving downward an annular injection tube annularly and radially along the base of an opening protective ring, and putting a cement mortar delivery hose at the rear end of the injection tube and fixing; making an injection liquid (i.e. cement mortar) composed of cement and water at a ratio of 1:0.75, adding a quick-setting agent into the injection liquid to reduce the time of osmosis; stopping injection when the injection amount of each injection tube reaches the design amount, and driving the exposed parts of the injection tubes into the soil by using the pneumatic pick; excavating the next segment, and connecting the concrete support wall with the top of the injection tubes; performing injection segment support wall construction; and after the excavation of each injection reinforcement segment is completed, repeating the previous steps till the loose gravel formation segment is passed through. The construction method has the advantages of simple construction, low investment, multi-segmental and circulating reinforcement and small injection amount, and can effectively prevent the loss of injection liquids, solidify the gravel formation, increase the friction force between the pile and the formation and improve the load-carrying capability of the friction piles.

Description

technical field [0001] The invention relates to a construction method of cast-in-situ pile foundations in highway engineering, railway engineering, municipal engineering and construction engineering, in particular to a construction method of manual hole-digging piles. Background technique [0002] In the construction of artificial excavated pile foundations, especially in the construction of cast-in-situ pile foundations with a diameter of 1m-2.5m and a depth of less than 30m, loose gravel strata or loose gravel stratum are often encountered within the pile body. For example, there are gravel formations with a particle size of 200mm-2mm, sandy formations, large stone formations, poor roundness formations, angular formations, poor sorting formations, relatively dry formations, and poor self-stability formations. In order to prevent hole collapse, construction methods such as all-steel casing bored piles, immersed pipe (prefabricated concrete pipe) excavated piles, and one-tim...

AI Technical Summary

Problems solved by technology

In order to prevent hole collapse, construction methods such as all-steel casing bored piles, immersed tube (prefabricated concrete pipe) excavated piles, and one-time soil grouting reinforcement are usually used in construction. Although the above construction methods can solve the problem of hole collapse, However, there are disadvantages such as large investment in equipment and materials, slow construction organization, and complicated construction technology.

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