Construction Method of Cast-in-situ Reinforced Concrete Large Diameter Pipe Pile

Abstract

The invention discloses a construction method of a PCC (cast-in-place concrete large-diameter pipe) pile, which comprises the following steps: taking a pile driver in place; rotating movable inner supports to close to limiting stoppers; closing a valve pile tip; sinking a pile mould; moving a vibration head; placing a reinforcement cage; arranging the vibration head; pouring concretes; drawing a tube in a vibrating manner; opening the valve pile tip and the inner supports; punching the concretes and the reinforcement cage into a foundation; and extracting a formed pile from the pile mould. The three or more than three movable inner supports and the limiting stoppers are uniformly arranged along the pile mould. Transverse spacer bars are arranged on the reinforcement cage, two end of each of the transverse spacer bars are provided with a semicircular elbow respectively, each transverse cross section of the reinforcement cage is provided with three or more than three transverse spacer bars, and one group of the transverse spacer bars is arranged along the horizontal direction at an interval of 3-5m. The movable inner supports and the reinforcement cage with the transverse spacer bars are arranged skillfully, thus the problem of construction of the PCC pile is solved, the application range of the PCC pile is expanded, the cost is low, and the higher bearing capacity is obtained with the less concrete consumption.

Description

technical field [0001] The invention belongs to the technical field of civil construction engineering, and in particular relates to a construction method for cast-in-place reinforced concrete large-diameter pipe piles. Background technique [0002] my country has a vast territory, and soft soil is widely distributed. There are many complex soft soil foundations in the coastal areas, especially in the Yangtze River Delta. The construction of roads, railways, bridges, etc. in soft soil areas requires reinforcement of soft soil foundations, and pile foundations and their composite foundation technology are the most widely used foundation treatment technologies. How to improve the utilization rate of unit material strength and improve the bearing capacity of pile foundation while saving the amount of building materials is one of the important topics that researchers have been paying attention to for a long time. [0003] Before the present invention, cast-in-place concrete larg...

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Problems solved by technology

However, this pile is a plain concrete pile without a reinforcement cage. Since a fixed support is set between the inner tube and the outer tube of the pile form to fix the position of the inner tube and the outer tube, the reinforcement cage cannot be lowered directly.

[0004] A hole former for concrete tubular piles with fixtures and its construction method (patent number: ZL03128977.0) discloses a construction method for cast-in-place reinforced concrete tubular piles, but this method has the following disadvantages: (1) Prefabricated The pile tips need to be prefabricated in advance and then sink into the ground with the pile formwork. The prefabricated pile tips cannot be reused, which increases the cost

(2) Due to the use of prefabricated pile tips, after the pile form is driven in, it can only move downward. If the pile form moves upward, it will be separated from the pile tip. fall off

(3) During the vibration process of the pile form, the prefabricated pile tips are not sealed, and groundwater is easy to seep into the pipe cavity

(4) Ordinary steel cages are used and there is no support between the inner and outer pile pipes. The inner pipe is easy to shake during construction, resulting in uneven wall thickness

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