Application of full casing drilling method in the construction of bored pile
2024-08-16
The construction method of full casing bored pile is an advanced technology for bored pile construction, which is commonly referred to as Benoit pile internationally. This construction method uses a hydraulic full casing drilling rig for construction, and the pile forming process is currently one of the most popular drilling and grouting pile construction technologies internationally, regarded as the most advanced of the three main construction methods for drilling and grouting piles in the world. The construction method of full casing drilled pile has a wide range of applications, including bridges, buildings, petrochemicals, and other fields.
The construction process roughly includes the following steps:
Construction preparation: including preparation work such as leveling the site, surveying and setting out, and positioning the fully rotating host.
Lifting and installation of steel casing: After the host is in place, lift and install the steel casing.
Measure and adjust verticality: Use a plumb bob to adjust the verticality of the casing to ensure construction quality.
Casing drilling for soil extraction: While casing drilling into the formation, soil extraction is carried out using a grab bucket or a rotary drilling rig.
Reinforcement cage production and installation: After drilling to the design elevation, the holes are cleaned and then the reinforcement cage is installed.
Concrete pouring, pulling out the casing, and pouring into the pile: After the installation of the steel cage is completed, concrete pouring is carried out, and then the casing is pulled out to complete the pouring of the pile body.
The characteristics of the construction method of full casing bored pile are its fast construction speed, high pile quality, and higher than the current national construction acceptance standards. The application prospects of this construction method are broad. With the increase of complex structures such as high-rise and super high-rise buildings, as well as large bridges in China, the technical quality requirements for foundation treatment are also increasing. It can be foreseen that the construction method of full casing bored pile will become the development direction of large-diameter bored pile construction technology in China in the future
The construction process roughly includes the following steps:
Construction preparation: including preparation work such as leveling the site, surveying and setting out, and positioning the fully rotating host.
Lifting and installation of steel casing: After the host is in place, lift and install the steel casing.
Measure and adjust verticality: Use a plumb bob to adjust the verticality of the casing to ensure construction quality.
Casing drilling for soil extraction: While casing drilling into the formation, soil extraction is carried out using a grab bucket or a rotary drilling rig.
Reinforcement cage production and installation: After drilling to the design elevation, the holes are cleaned and then the reinforcement cage is installed.
Concrete pouring, pulling out the casing, and pouring into the pile: After the installation of the steel cage is completed, concrete pouring is carried out, and then the casing is pulled out to complete the pouring of the pile body.
The characteristics of the construction method of full casing bored pile are its fast construction speed, high pile quality, and higher than the current national construction acceptance standards. The application prospects of this construction method are broad. With the increase of complex structures such as high-rise and super high-rise buildings, as well as large bridges in China, the technical quality requirements for foundation treatment are also increasing. It can be foreseen that the construction method of full casing bored pile will become the development direction of large-diameter bored pile construction technology in China in the future
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