Excavation method of pile hole

Abstract

The invention discloses an excavation method of a pile hole. The excavation method comprises the following steps that a drilling rig is in place, primary excavation is conducted through an ordinary drill bit, and a main body pile hole is obtained; the ordinary drill bit is replaced with an expanding drill bit, the bottom of the main body pile hole is primarily expanded through the expanding drillbit, and an expanded hole is obtained; the drilling rig is moved away, a crane is driven to the position beside the main body pile hole, and a protective cylinder is placed into the main body pile hole through the crane; a worker enters the bottom of the main body pile hole through the protective cylinder, and then a protective shed is constructed between the top of the expanded hole and the outerwall of the protective cylinder; the expanded hole is manually expanded to the size; and the protective shed is dismantled, the worker withdraws from the expanded hole, the crane hoists the protective cylinder out, and construction of the pile hole is completed. The excavation method combines the advantages of high mechanical hole forming speed with good manual hole forming quality, the construction progress is fast, manpower construction is reduced, and potential safety hazards brought by manual excavation are lowered. Consistency of the pile bottom expanding line type and design is guaranteed through manual bottom expanding, the construction quality of a cast-in-place pile is guaranteed, the construction quality is good, and construction is fast.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a pile hole excavation method. Background technique [0002] In building construction, pile foundation is a common form of foundation. The advantages of hole piles are no vibration, no soil compaction, low noise, etc. The pile hole excavation mainly includes mechanical excavation and manual excavation. The two methods have their own advantages and disadvantages. its scope of application. Manual excavation piles are suitable for clay with little groundwater or less groundwater, silty clay, clay with a small amount of sand, sand pebbles, gravel and other good soil quality. The efficiency of mechanical excavation is high, but the accuracy of the pile holes dug is relatively low. Low, the accuracy of manual excavation is very high, but the excavation construction of manual excavation piles mainly relies on manual construction in a limited space, which involves the foll...

AI Technical Summary

Problems solved by technology

[0003] 1. Due to space constraints, a single pile can only accommodate 1 to 3 people for construction, and the construction progress is generally about 1000mm / day.

[0004] 2. During the construction of manual excavation piles, the air in the pile holes is thin and needs to be ventilated. There may also be harmful gases such as flammable, explosive, and toxic gases in the holes. , There is a risk of falling out of the working surface, and the lighting in the hole may leak electricity, etc., all of which pose a greater safety risk to the construction personnel

[0005] 3. Excavation uses permanent (such as: reinforced concrete) retaining walls, resulting in higher construction costs

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