Construction method of concrete cylinder buried in soft ground and its special hole forming device

Abstract

The invention discloses a construction method and a special hole forming machine of a concrete cylinder buried in a soft foundation. The special hole forming machine comprises an inner protection casing and an outer protection casing, wherein the upper end of the inner protection casing is connected with the upper end of the outer protection casing through a gland, and a taper tube formed at the upper end of the inner protection casing is inserted in a force application pressure head placed on the gland; the lower end face of the inner protection casing and the lower end face of the outer protection casing are matched with an inner bearing surface and an outer bearing surface of the upper end of a cylinder boot through ratchet structures respectively; the cutting edge at the lower end of the cylinder boot is in a sawtooth shape; a tooth ring is fixed on the periphery of the outer protection casing; the special hole forming machine is further provided with a driving mechanism which comprises a gear meshed with the tooth ring on the periphery of the outer protecting casing; the special hole forming machine also comprises a high-pressure water pipe arranged in a cylinder hole between the inner protection casing and the outer protection casing; the upper end of the cylinder boot is provided with a water inlet, and the lower end of the high-pressure water pipe is connected with the water inlet in a sealed mode; the lower end of the cylinder boot is provided with a plurality of water outlets which are communicated with the water inlet waterways in the cylinder boot. By means of the construction method and the special hole forming machine, construction speed can be increased, and the construction depth can be increased; meanwhile, pressure needing to be applied by a pressure applying device is reduced, and therefore the requirement for construction equipment is lowered.

Description

technical field [0001] The invention belongs to the field of building construction equipment, and in particular relates to a construction method for a concrete cylinder buried in a soft foundation and a special hole forming device thereof. Background technique [0002] The concrete cylinder buried in the soft foundation has many applications in the underground construction process. For example, the pouring hollow pile in the foundation construction, and the retaining wall of the underground caisson are all concrete cylinders with a thin-walled structure. The traditional concrete barrel pile construction method is to pour concrete into a single barrel. This construction method needs to discharge a large amount of soil during the hole forming process, and the amount of soil extraction is large; similarly, a large amount of concrete is required during the pouring process, which affects the project. progress, and increased project costs. [0003] In the patent No. 98113070.4, t...

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Problems solved by technology

However, the construction method of this double-steel tube structure has relatively high requirements on equipment, and it needs to apply a lot of pressure to press the casing into the soil, which makes the construction equipment cost high and the construction time of the concrete cylinder is long.

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