Manual hole digging pile quicksand layer protection device and construction method thereof

Abstract

The invention belongs to a manual hole digging pile quicksand layer protection device and a construction method thereof, and relates to building pile foundation construction. The manual hole digging pile quicksand layer protection device is formed by tightly sleeving a plurality of conical steel casings in a tile mode, the conical steel casings are arranged in a big-end-down mode, and the sectionsof the combined casings are trapezoidal. The construction method comprises the following steps that (1) the conical steel casings are prefabricated; (2) the position of a quicksand layer is detected;(3) double-liquid slurry is injected into the quicksand layer in an inclined downward mode; (4) manual downward excavation is conducted, and the first sections of conical steel casings are installed;(5) the double-liquid slurry is injected; (6) manual excavation is conducted, and the second sections of conical steel casings are installed; (7) the steps (3)-(6) are repeated until passing throughthe quicksand layer; (8) grouting and joint filling are conducted, and gaps between the steel casings and the quicksand layer are filled; (9) digging continues to be conducted downwards to the bottom,and a lower concrete retaining wall is poured in situ. According to the device and the construction method, the quicksand layer can be penetrated, the construction difficulty that a manual hole digging pile penetrates through the quicksand layer can be effectively simplified, and the construction efficiency is improved.

Description

technical field [0001] The invention belongs to a quicksand layer protection device and a construction method of an artificial hole-digging pile, and relates to the construction of building pile foundations. Background technique [0002] Existing manual hole-digging piles pass through the silt layer, use straw to add steel bars, planks to block the sand, and then use concrete to protect the wall. Another kind of steel casing construction adopts the quicksand layer when digging the hole. Generally, a steel casing casing with a height of 1-2m and a thickness of 4-5mm can be set in the well hole. The diameter is slightly smaller than the inner diameter of the concrete retaining wall, and the concrete support is used as a fulcrum. Use a small hydraulic jack to gradually press the steel casing into the soil to stop the quicksand. The steel casings can be sunk one by one, pressed into a section, excavated a section of pile holes until passing through the quicksand layer 0.5-1.0m,...

AI Technical Summary

Problems solved by technology

[0003] The construction is simple by using straw to add steel bars and wooden planks to block sand. However, after the straw rots, a cavity will be formed, which will affect the quality of the pile foundation. Traditionally pressed into the rigid casing, using the original concrete support and hydraulic jacking, the process is complicated, due to the narrow space in the hole. , the construction is difficult, the use of steel casing still has the effect of reducing drag on the pile foundation, and affects the load of the pile foundation itself

The traditional steel casing is cylindrical and divided into 2-4 pieces. The upper and lower sides of each piece are connected by bolts. There are disadvantages such as difficulty in aligning the upper and lower bolt connections, difficult fixing of the steel casing, and poor water-stop effect.

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