Construction technique for self-leading hole at pile tip of embrace press type PHC tubular pile to enter rock through static pressure

Abstract

The present invention relates to a construction process capable of utilizing high pressure to make the pile tip of PHC pipe pile self-hole and enter into rock. It is characterized by that it utilizes high-pressure water flow and high pressure air flow to impact and pulverize solid gravel stratum positioned in the front end of pile tip. Said invention also provides the concrete method and steps for implementing said construction process.

Description

technical field [0001] The invention relates to a construction method of building foundation piles, in particular to a construction technology of pressure-embracing PHC pipe piles with self-guiding holes for static pressure entry into rocks. Background technique [0002] A large number of foundation piles are used in the development of tall buildings. However, PHC pipe piles are produced industrially, the quality is intuitive, and the quality of the pile-forming process is easy to guarantee. Compared with other concrete pouring piles, it has the advantages of low cost, short construction period, and environmental protection. It has become the development direction of construction piles. At present, there are mainly two types of pile sinking techniques: hammering type and static pressure type. Hammering pile driving has a long construction period, vibration, pollution, unstable pile driving process, noise, and does not meet environmental protection requirements; static press...

AI Technical Summary

Problems solved by technology

Hammer pile driving has a long construction period, vibration, pollution, unstable pile driving process, noise, and does not meet environmental protection requirements; static pressure pile driving requires large-scale professional rock-entry equipment

The tight fit pile pressure force between the pile clamp and the pile feeder of the traditional static hydraulic pile driver generally does not exceed 550 tons. When encountering a hard ground, it is difficult to statically press into the rock. The problem of piling cost

[0003] During the application of static pressure pile sinking, it is difficult for the pile tip to penetrate the gravel sand layer to reach the strongly weathered rock layer

When the load-bearing layer at the pile tip is selected in the gravel sand layer, the resistance at the pile tip is generally large when the pile is pressed, but the bearing capacity of the pipe pile in the static load test is much smaller than that of the pile when the pile is sunk, and the value of the bearing capacity of a single pile is relatively low. Low, unable to give full play to the pile body strength of the pipe pile

However, the hammering method construction cannot meet the environmental protection requirements due to vibration and noise. At the same time, the construction vibration is easy to cause damage to surrounding buildings and underground structures, and it is difficult to make all pile ends enter the same bearing layer due to hammering vibration and subsequent compaction. As a result, the phenomenon of long and short piles is produced. The traditional hammering prefabricated pipe pile technology is backward, and it is not suitable for hard strata such as strong weathered rock.

[0004] How to overcome the problem that the conventional dry hydrostatic hydraulic rock entry construction technology is not suitable for the hard gravel sand layer is to continue to promote the application of this construction method with high work efficiency, no noise, stable pile sinking, and environmental protection requirements.

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