Static pile press machine for guiding hole and excavating in middle and construction method thereof

Abstract

The invention discloses a construction method of a static pile press machine for guiding a hole and excavating in the middle. The construction method comprises the following steps of: 1, placing the pile press machine in place; 2, installing a pipe pile; 3, hydraulically delivering the pile in a top soft soil layer; 4, installing a drill bit and a drill rod; 5, guiding the hole and excavating in the middle and delivering the pile in a force-holding hard soil layer; 6, reaming the force-holding hard soil layer; 7, pouring the pile bottom; and 8, finishing the pile foundation. The invention also discloses the static pile press machine for guiding the hole and excavating in the middle, which implements the method. The equipment and the construction process are synchronously improved, the foundation soil layer under and on the side part of the pipe pile is excavated and drilled by combining the bottom-expanding drill bit and the spiral drill rod, the diameter of the drilled hole is greater than that of the pile, and the hole guiding, the middle excavating and the pile pressing are synchronously performed, so that the construction efficiency and the construction quality are greatly improved, and the construction cost is reduced; and the static pile press machine for guiding the hole and excavating in the middle can overcome the defect that the static pile press machine difficultly passes through the hard sand layer, so that the pile-sinking foundation smoothly reaches the designed bearing stratum, the stratum adaptability of the equipment is increased, and the design requirement of the pile foundation engineering can be met.

Description

technical field [0001] The invention relates to the technical field of a static pile driver and pile driver construction, in particular to a static pile driver for digging in a lead hole and a construction method thereof. Background technique [0002] The static pressure pile sinking method is a pile sinking process that uses the self-weight of the static pile driver and the counterweight on the frame to provide a reaction force to press the pipe pile into the soil. This process has the advantages of no vibration, no impact, no noise, etc. At the same time, the pile body is made of high-strength prestressed prefabricated pipe piles. Using this pile as the foundation has the characteristics of simple process, reliable quality, low cost and convenient detection. However, when the static pile driver encounters a thicker hard sand layer during the pile pressing process, it will cause construction difficulties due to the increase in resistance, which is also an important reason f...

AI Technical Summary

Problems solved by technology

However, this construction method consumes a long time and increases the construction cost

It is easy to collapse the hole, and it is difficult for the pile driver to align the hole position

[0005] 2. When the static pressure cannot be relied on to continue sinking the pile, the hammering method is adopted to rely on the impact on the hard sand layer to penetrate the hard sand layer. However, this method will cause great damage to the prefabricated pipe pile and cause Damage to the pile body, loud noise, and oil splash pollute the environment

The invention can only drill the soil in the cavity of the inner wall of the pipe pile and the soil directly below the cavity by using the drill pipe, but cannot drill the soil at the side of the foundation below the pipe wall of the pipe pile, and the diameter of the drill hole is smaller than the diameter of the pile, resulting in When the pile passes through the hard sand layer and hard rock layer, it is still difficult or impossible to pass through the static pressure pile sinking, which cannot meet the engineering design requirements; this kind of construction method and equipment are due to the alternate operation of the pilot hole and the pile pressure, and the alternate operation of the two Complicated, time-consuming, and energy-intensive, affecting construction progress and increasing construction costs

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