Casing-less, long-spiral concrete secant pile construction method

Abstract

A casing-less, long-spiral concrete secant pile construction method relates to the construction of concrete secant pile structures in the field of construction projects. The construction method includes the following steps: (A) pile positions are determined, and neighboring pile bodies are secantly lapped; (B) a long-spiral drilling machine is mounted in place and aligned; when the long-spiral drilling machine is moved to nearby a pipe position, the chassis of the long-spiral drilling machine is adjusted to be flat, the tower of the long-spiral drilling machine is adjusted to be vertical, and the drill bit of the long-spiral drilling machine is adjusted to be aimed at the center of a pile; (C) a hole is drilled by a designed depth; (D) after the hole is drilled by the designed depth, the drill bit is lifted up by 0.2m to 1m, and a concrete pump is then used for feeding concrete to the bottom of the hole via a concrete hose and a hollow drill stem; (E) after the concrete is filled to the orifice of the operating face, the long-spiral drilling machine is moved; (F) the long-spiral drilling machine is moved to the next pile position, and steps B, C, D and E are repeated. According to the method, not only the construction quality and the water-stopping effect are better guaranteed, but also the construction efficiency is greatly increased, the cost is lower, and the method is more favorable for on-site civilized construction management and environment protection.

Description

technical field [0001] The invention relates to the construction technology of concrete occlusal pile structures in the field of construction engineering. Background technique [0002] As the new retaining structure or waterproof and anti-seepage structure of the occlusal pile has the function of water and soil retaining at the same time, the water-stop effect is more reliable than other water-stop structures, and the soil retaining capacity is close to that of the underground diaphragm wall structure and higher than other support structures. , the cost is between the underground diaphragm wall and other supporting structures, so it is very competitive in ultra-deep foundation pit support engineering and anti-seepage and water-proof engineering, and is more and more valued by the industry. [0003] At present, there have been more than ten patent applications on the subject of "occlusal piles", such as: "a construction method for occlusal piles suitable for soft soil and soi...

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Problems solved by technology

[0004] The current problems of occlusal pile technology in the industry are: 1. The pile body materials of occlusal piles are mainly ordinary underwater concrete, ultra-retarded concrete, cement soil or soil-curing agent mixture; 2. The most widely used construction equipment It is an (integrated or separated) casing drilling rig, and some patented technologies use multi-axis drilling rigs for construction; 3. Except for some patented technologies, the construction technology basically uses two-sequence piles in sequence and interval construction; 4. The construction cost is relatively high 5. The construction efficiency is not high; 6. The occlusal pile constructed by the casing drilling rig is easy to deviate when the pile depth is large, which makes the lap joint effect unsatisfactory

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