Dry-method hole forming filling pile structure for post-grouting matched rotary drilling rig and construction method

Abstract

The invention discloses a dry-method hole forming filling pile structure for a post-grouting matched rotary drilling rig and a construction method. The filling pile structure comprises a hole pile body arranged in a terrace. The hole pile body is composed of concrete and a steel reinforcement cage arranged in the concrete. The steel reinforcement cage comprises cylindrical main ribs which are evenly distributed. Hoop ribs and reinforcing hoops are arranged on the outer sides and the inner sides of the main ribs respectively. Multiple grouting pipes are evenly arranged in the circumferential direction of the steel reinforcement cage. The construction method includes the steps that firstly, a site is cleaned and leveled; secondly, measurement and take-off operation are performed and a pile position is buried; thirdly, the drilling rig is in place and drills the surface layer and a steel protective barrel is buried; fourthly, the center line of the pile is rechecked; fifthly, a pile hole is drilled; sixthly, a bearing stratum and the formed hole are checked; seventhly, the hole is cleaned; eighthly, a grouting pipe is manufactured and installed; ninthly, the steel reinforcement cage is lifted to be in position; tenthly, a concrete pouring guide pipe is installed; eleventhly, the concrete is poured; twelfthly, the grouting pipe is cleared out through clean water; and thirteenthly, grouting is performed. By the adoption of the structure and the method, the side friction resistance force of a rock-socketed section of the end of the pile is improved.

Description

technical field [0001] The invention belongs to the technical field of hole-forming cast-in-situ piles by rotary drilling and drilling machines, and in particular relates to a dry-process hole-forming cast-in-place pile structure and construction method of a rotary drilling machine matched with post-grouting. Background technique [0002] The conventional rotary drilling rig has the advantages of fast construction speed, flexible and convenient operation, etc., and is favored by more and more construction units for hole formation. At present, there are two ways of mechanical drilling for rotary drilling: [0003] The first is to form holes in the mud retaining wall. The main function of the mud in the pile foundation construction is to protect the wall and suspend sludge, which can realize the secondary hole cleaning before the concrete pouring of the hole pile; [0004] The second is to use the dry method to form holes under the condition that the geological conditions are...

AI Technical Summary

Problems solved by technology

[0007] (2) The bearing capacity of the pile foundation cannot meet the design requirements, and the grouting pipe is pre-embedded in the pile;

[0008] (3) Larger-diameter rotary drilling piles cannot be implemented on site, and the grouting pipes are pre-embedded in the piles for grouting

[0011] (1) The mud retaining wall of the rotary drilling rig forms a hole-forming pile. During the hole-forming process, mud and mud treatment need to be prepared, and there is a certain degree of environmental pollution.

Due to mud preparation, facilities and equipment such as mud pools, mud preparation materials and mud pumps must exist, and the construction cost is high

At the same time, due to reasons such as mud concentration and incomplete hole cleaning, the phenomenon that the thickness of the sediment at the bottom of the hole exceeds the standard occurs from time to time, which seriously affects the bearing capacity of the pile foundation;

[0012] (2) The dry method of rotary drilling can only clean the hole after the final hole and before the hoisting of the steel cage. After the steel cage is hoisted in place, the secondary cleaning of the hole cannot be realized.

Once the slag on the hole wall occurs during the hoisting of the steel cage and the installation of the concrete conduit, the slag at the bottom of the hole will increase, causing the thickness of the slag to exceed the standard;

[0013] (3) When quality problems such as too thick sediment at the bottom of the pile are found through inspection, drilling and grouting in the pile is a remedial reinforcement method, which has high cost and long construction period

There are also perforations or offsets due to poor verticality control when drilling holes in piles, which affects the effect of grouting reinforcement

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