High polymer grouting protective structure of manual digging pile and its construction method

Abstract

The invention relates to a manual hole digging pile high polymer grouting protection structure and a construction method thereof. The manual hole digging pile high polymer grouting protection structure is characterized in that a pile hole wall is set to be a waterproof supporting ring formed by high polymer grouting; a pressure grouting ring is arranged on the top of the waterproof supporting ring, and strengthening columns formed through high polymer grouting are distributed on the periphery of the waterproof supporting ring; in a bottom overbreak section of a pile hole, a lime strengthening layer is formed through lime pavement, and graded broken stones are laid on the lime strengthening layer to form a broken stone waterproof layer; and pressure grouting plates are fixedly arranged on the top face of the broken stone waterproof layer, a high polymer grouting solution is injected through bottom grouting holes formed in the pressure grouting plates and seeps into gaps of the graded broken stones, and a waterproof bottom plate is formed through expansion curing. The waterproofing and wall protecting work during construction is carried out in advance, bottom and side wall waterproofing and periphery supporting strengthening are combined, the technology is simple, and the project cost is low. The hole digging pile underground work conditions are improved, the later pile construction quality and progress are guaranteed, and obvious economic benefits and high popularization value are achieved.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a high polymer grouting protection structure for manual hole-digging piles and a construction method thereof. Background technique [0002] Manual digging pile refers to that the pile hole is formed by manual excavation method, a steel cage is placed in the pile hole, and then concrete is poured to form a pile. Advantages of manual digging piles: [0003] First, the operation space requirement is small, the construction is convenient, the construction speed is fast, the process is simple, and no large mechanical equipment is required; [0004] Second, compared with wooden piles and concrete driven piles, the seismic capacity is stronger, and the cost is lower than that of impact cone punching, rotary drilling rig drilling and caisson foundation, etc., and there is no noise; [0005] The third is that the manual excavation pile does not produce mud, which i...

AI Technical Summary

Problems solved by technology

[0008] 1. The power consumption of retaining walls is high; when the excavation depth of manual digging piles reaches 1.0m, concrete not lower than the concrete strength of the pile body must be used for retaining walls, and the excavation construction can only be continued after the retaining walls meet the strength requirements. It is cumbersome, requires a large amount of materials and tools, a large amount of labor for workers, inconvenient transportation and stacking of materials, and large material consumption, resulting in long construction periods and increased project costs

[0009] 2. Poor construction safety; when the groundwater is rich and the foundation soil is a soil layer with a large permeability coefficient, if it cannot bear the water and soil lateral pressure, and the precipitation measures are not taken in time, water seepage and mud gushing will easily occur, resulting in the collapse of the hole wall ;Due to the water and humidity in the pile hole and the narrow construction surface, if the wires of the ventilation equipment and lighting equipment used are damaged, electric shock accidents are prone to occur

[0010] 3. Water accumulation at the bottom of the hole; because a project requires multiple pile foundations, after the completion of the excavation construction of a manual excavation pile, the pile body often cannot be filled in time, and it is necessary to wait for the completion of the excavation construction before the pile body can be filled. , so the bottom of the hole is prone to water accumulation, and the pumping operation must be carried out again when the pile body is filled, which affects the construction quality and construction progress

At present, there are no relevant reports on polymer grouting protection technology for manual excavation piles in China

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