Preparation method for novel ultrahigh-performance concrete pile casing used in pile foundation project

Abstract

The invention relates to the field of bridge construction, in particular to a preparation method for a novel ultrahigh-performance concrete pile casing used in a pile foundation project. The pile casing is made of ultrahigh-performance concrete; the ultrahigh-performance concrete is prepared from cement, fine sand, finely ground quartz sand powder, silica fume powder, a water-reducing agent, water and fine steel fiber of which the ratio is 100 : (400-470) : (80-120) : (10-50) : (0.6-1.0) : (37-45) : (0.001-0.004). As the ultrahigh-performance concrete is used as the material of the pile casing, the pressure resistance and tensile strength of the concrete pile casing are improved, the structure toughness is improved, and the pile casing is suitable for regions with shallower cover layer and high bed rock bearing capacity, solves a problem that a steel casing has high possibility of hemming and deformation, has the advantages of low price and wide applicable range, and is conducive to environment protection.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a method for preparing a novel ultra-high performance concrete casing used in pile foundation engineering. Background technique [0002] Bored pile foundation is the most common form of bridge foundation. It has the advantages of high vertical bearing capacity, short construction period, mature technology and low resource allocation. It has been applied in many bridge foundations across rivers and seas at home and abroad. The main construction links of bored pile foundation include casing production and insertion, drilling into holes, reinforcement cage production and lowering, underwater concrete pouring, etc. Drilling into holes is the core process of pile foundation construction, and casing construction It directly affects the quality of the drilled hole. At present, the pile foundation casing is generally made of steel, and after being transported to the site, it is vibrat...

AI Technical Summary

Problems solved by technology

For areas with shallow overburden and high bearing capacity of bedrock, the pile foundation casing needs to pass through the overburden and enter the bearing rock layer to a certain depth. Conventional steel casings are prone to curling or local deformation after entering the rock layer with high bearing capacity. etc., if the wall thickness of the casing is increased, the construction cost will increase significantly; if the steel casing does not enter the bearing rock formation, it is very likely to cause collapse in the hole, seriously affecting the quality of the hole, and also causing damage to the surrounding environment. certain pollution

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