Construction method for pedestal piles

Abstract

The invention discloses a construction method for pedestal piles, which includes the following steps that at a predetermined pile position, a drilling machine is utilized to drill a hole to a set depth, and filler is filled into the drilled hole by pressure; a steel casing is inserted into the drilled hole; filler and dry concrete are filled from the opening of the top of the steel casing, and after repetitive ramming, an expanded pedestal is formed and hammering is stopped; a precast tubular pile is put in from the opening of the top of the steel casing; after grouting operation is completed, the steel casing is upwardly pulled out by vibration, and thereby the construction of a pedestal pile is complete. The construction method for pedestal piles designed by the invention has the following advantages that the construction period is short, the efficiency is high, moreover, the quality of the fabricated pile foundation is good, the construction cost is low, and the bearing capability is high.

Description

technical field [0001] The invention relates to the field of pile foundations in civil engineering, in particular to a construction method for bottom-expanding piles. Background technique [0002] The technology of long auger bored grouting piles has no noise, no vibration, no soil squeezing effect, can be constructed close to buildings, has low requirements on the site, and has high pile-forming efficiency in streamlined operations. It can pump diverse materials and form holes. With many advantages such as adjustable specifications, no sediment, high side friction coefficient, and a wide range of applicable soil properties, it has become an important process technology in the construction market under the engineering geological conditions of "high groundwater level, soft top and hard bottom" in the coastal area But for high bearing capacity piles, the strength of its cast-in-place reinforced concrete is limited, and it can only be satisfied by increasing the pile body speci...

AI Technical Summary

Problems solved by technology

[0004] ① It is difficult for the bottom of the pile to sink into the shallower and thicker lower hard layer (medium-dense silt and silt) at a certain depth at the top; or, even if it is sunk in place, it often happens that the casing is difficult to pull out question;

[0005] ② If cast-in-place reinforced concrete is used as the pile body (dowel), there are still problems with the quality, reliability and strength of the pile body;

[0006] ③ In terms of pile body strength, industrially produced high-strength prefabricated piles of smaller specifications can better meet the requirements of high-bearing capacity piles, but if high-strength prefabricated piles are used, standard 400MM and 500MM prefabricated piles cannot be hollowed out by standard vibratory hammers. into the pipeline;

[0007] ④ If a high-power vibratory hammer is installed on the pile frame, it will involve problems of excessive vibration noise, wide range of surrounding influence, bulky and inconvenient pile driver, and low efficiency;

[0008] ⑤According to the conventional carrier pile technology, one machine completes the construction of one pile, and the efficiency is extremely low. The large and complete equipment configuration is complex and complex, and the components are mutually restricted. The simple enlarged equipment for making high-bearing capacity piles will cost more High, bulky, impractical, and less efficient;

[0009] ⑥Huge vibration pulling pipes will have an adverse effect on the combination of prefabricated pipe piles placed at the bottom of the casing and the compacted plain concrete

[0010] The above problems have affected the technical application of long auger bored grouting piles and carrier piles, and it is difficult to produce piles with high bearing capacity that meet the three main requirements of good quality, low cost and short construction period

Images