Construction method of spin digging pile

Abstract

The invention relates to a construction method of a spin digging pile. The construction method comprises the following steps: 1, a pile foundation hole position is determined, and a rotary drilling rig 1 is adopted to dig a pile hole 2 according to the process design requirements; 2, the hole forming depth of the rotary drilling rig is 1-2 m, the formed hole with the depth is reinforced manually through mortar, and a full steel pile casing 3 is embedded; 3, the rotary drilling rig continues digging, the hole forming depth is 2-4 m, a concrete sprayer 4 is moved to the position above the pile hole, and a spraying head 6 on a grouting pipe 5 of the concrete sprayer is driven by a lifting device to enter the formed hole to spray concrete to the inner wall of the pile hole; and 4, the liftingdevice is started to lift the grouting pipe, after the concrete is solidified, the pile hole continues being deeply dug through the rotary drilling rig, and the step 3 is repeated till the drilling required depth is reached. The construction method has the effect of conveniently reinforcing the formed pile hole.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a rotary digging pile construction method. Background technique [0002] The rotary excavation pile refers to the hole pile formed by the construction of the rotary excavator. During the construction, the rotary excavator first rotates and breaks the rock and soil through the barrel drill bit with a valve at the bottom, and directly puts the broken rock and soil into the drill bucket, and then The lifting device of the drilling rig and the telescopic drill rod lift the drill bit out of the sloped soil outside the hole pile, so that the reciprocating cycle continuously takes and unloads the soil until the drill reaches the design depth. Rotary excavation piles have been widely used in roads, railways, bridges and large buildings. For rock and soil layers with good adhesion, dry or clear water drilling technology can be used without mud retaining walls. In some areas...

AI Technical Summary

Problems solved by technology

However, when the underground soil is a pebble layer with large gaps, a backfill gravel layer, etc., it is difficult to realize the mud retaining wall, and the hole collapse phenomenon often occurs when the hole is dried, and the cost of using a steel pipe as a casing is too high, and the construction period is too long. many

[0003] During the construction process, the loose soil layer of the pile wall often collapses, and part of the soil in the loose soil layer falls into the bottom of the pile hole or the concrete and exists in the solidified concrete pile body, reducing the quality of the concrete pile body and making the pile foundation The carrying capacity is reduced, which brings greater safety hazards

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