Super-thick clay layer positive circulation cast-in-situ pile slag discharge promoting device and its construction method

Abstract

The invention relates to a slagging promoting device for an ultra-thick clay layer positive-cycle and a construction method of the slagging promoting device. The device comprises crushing steel wire rope bundles, steel wire rope clamps, a fixing pressing bar and a drill rod. The crushing steel wire rope bundles are composed of a plurality of steel wire ropes. Each steel wire rope is connected to be in a ring shape through the corresponding steel wire rope. The crushing steel wire rope bundles are fixed to the drill rod in sequence through the fixing pressing bar. The steel wire rope bundles are symmetrically arranged along the drill pipe in two rows. The construction method includes the steps that the discharging length of each steel wire rope is calculated according to the diameter of a pile hole; the steel wire rope clamps are used for locking all the steel wire ropes into ring shapes, and the position, on the surface of the drill rod, of each steel wire rope is marked; the fixing pressing bar is used for fixing the steel wire rope bundles to the drill rod in sequence according to the sizes of diffusion diameters; a common positive-cycle drilling machine is used for drilling to the position close to a clay layer; and a first section of a common drill pipe is replaced with the drill pipe manufactured in the step, and subsequent drilling construction work is conducted. According to the slagging promoting device, the slagging capability and the drilling efficiency of the positive-cycle construction technology in drilling in the ultra-thick clay layer are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of pile foundation engineering construction, and in particular relates to a slag discharge promoting device and a construction method for an ultra-thick clay layer positive circulation cast-in-place pile. Background technique [0002] The application of bored piles in our country has a history of more than 50 years. The commonly used mud retaining bored piles have the advantages of adapting to various soil conditions, flexible pile diameter and pile length, and large single pile bearing capacity. The preferred form of pile foundation. Among them, the positive cycle construction technology is most widely used in the specific construction process due to its advantages of simple operation, less supporting equipment and appliances, and low engineering cost. However, the positive circulation construction technology also has disadvantages such as poor slag discharge ability, large amount of sediment at the bottom...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a super-thick clay layer positive circulation cast-in-place pile slag discharge promoting device and its construction method, using the common construction materials round steel and steel wire rope at the construction site, from the positive circulation construction process in super-thick clay Starting from the root of the problem of poor slag discharge ability in the layer, by reducing the clay slag block diameter in time and reducing the clay slag deposition thickness, the slag discharge ability and drilling performance of positive circulation construction technology in ultra-thick clay layers can be improved. purpose of efficiency

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