Rotary drilling type sand-pumping hole-forming side wall high-pressure grouting device and construction method

Abstract

The invention provides a rotary drilling type sand-pumping hole-forming side wall high-pressure grouting device and a construction method. The rotary drilling type sand-pumping hole-forming side wall high-pressure grouting device is characterized in that an inner protection cylinder is sleeved with a floral tube in a wrapping mode, a steel protection cylinder is fixedly arranged on the portion, located on the lower portion, of the outer portion of the inner protection cylinder in a sleeving mode by a certain length, an annular cavity is formed between the inner protection cylinder and the floral tube, a grout storage layer is formed, an opening in the top end of the grout storage layer is blocked by a pressing sheet, the grout storage layer communicates with a grouting machine for grouting, a rotary type drawing disc is arranged in the bottom end of the inner protection cylinder in a spliced mode, a chain bucket device is arranged in the inner protection cylinder, and a plurality of evenly-distributed digging buckets used for digging sand are arranged on the chain bucket device. According to the rotary drilling type sand-pumping hole-forming side wall high-pressure grouting device, high-pressure grouting is conducted on the side wall of a pile hole while suction type drilling is conducted, and the foundation structure condition is improved through the technology in which the pile periphery is solidified through pressure grouting of the side wall of the pile hole.

Description

technical field [0001] The invention relates to a new hole forming method and the field of pile side reinforcement in a calcareous sand foundation, in particular to a rotary drilling type sand pumping type high pressure grouting device and a construction method for the side wall of the hole. Background technique [0002] Coral sand is coral or shell fragments, with the characteristics of continuous release of calcium carbonate, with different particle sizes and various specifications. The biggest feature of coral sand is that it is rich in micropores, has low strength, is easy to break, and is not easy to recover after structural damage. When a pile is formed in a calcareous sand foundation, because the calcareous sand will break down under a small stress, whether it is a driven pile or a cast-in-place pile, due to the disturbance to the calcareous sand foundation soil, the calcareous sand around the pile will be broken. After being squeezed, the particles are broken, resul...

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Problems solved by technology

[0003] Different from traditional foundations, calcareous sand has the properties of looseness, large pores, and easy breakage. The traditional mud retaining method is used to inject sea cement slurry prepared with materials such as bentonite, seawater, tackifier, and dispersant into the pile holes of the calcareous sand foundation. In the study, it was found that the water in the mud would permeate and flow away when it entered the calcareous sand foundation, lubricating the interior of the calcareous sand, reducing the friction between the calcareous sand particles, and finally the remaining mud skin hung on the side wall of the pile hole, and the mud skin Gravity is greater than the cohesive force between calcareous sands, resulting in the collapse of pile holes. Therefore, traditional mud retaining walls cannot be well applied to calcareous sand foundations

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