In-hole mechanical pile construction technology for metro construction
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A construction technology and mechanical technology, applied in artificial islands, sheet pile walls, water conservancy projects, etc., can solve the problems of low construction efficiency and instability of mechanical piles, and achieve the effect of improving construction efficiency, facilitating transportation and installation, and facilitating irrigation.
Inactive Publication Date: 2020-02-28
CHINA RAILWAY 16TH BUREAU GRP CO LTD
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Problems solved by technology
[0004] The purpose of the present invention is to provide a construction process of mechanical piles in caves for subway construction, so as to solve the problem of low construction efficiency and instability of mechanical piles
Method used
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Embodiment 1
[0026] A construction technique of mechanical piles in a tunnel for subway construction, comprising the following steps:
[0027] 1. Mud mixing
[0028] The mud used for opening the hole is made of high-quality bentonite. When drilling into the clay layer, the original soil can be used to make slurry. During the construction, the specific gravity, viscosity, sand content and colloidal rate of the mud are often measured, and the top surface of the mud inside the casing is always higher than the water level outside the casing. Technical requirements for mud preparation and testing:
[0029] (1) Collect mud samples in time, measure performance indicators, conduct the first test on the newly prepared mud, and conduct another test before use, and often test during the drilling process to ensure the quality of the mud;
[0030] (2) The stored mud is stirred every 8 hours, and each time the mud is stirred or the test result is used as the original record;
[0031] (3) After the fre...
Embodiment 2
[0052] A construction technique of mechanical piles in a tunnel for subway construction, comprising the following steps:
[0053] 1. Mud mixing
[0054] The mud used for opening the hole is made of high-quality bentonite. When drilling into the clay layer, the original soil can be used to make slurry. During the construction, the specific gravity, viscosity, sand content and colloidal rate of the mud are often measured, and the top surface of the mud in the casing is always higher than the water level outside the casing.
[0055] Technical requirements for mud preparation and testing:
[0056](1) Collect mud samples in time, measure performance indicators, conduct the first test on the newly prepared mud, and conduct another test before use, and often test during the drilling process to ensure the quality of the mud;
[0057] (2) The stored mud is stirred every 8 hours, and each time the mud is stirred or the test result is used as the original record;
[0058] (3) After th...
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Abstract
The invention discloses an in-hole mechanical pile construction technology for metro construction, and relates to the technical field of mechanical pile construction. The in-hole mechanical pile construction technology mainly solves the problems that a mechanical pile is low in construction efficiency and poor in stability. The construction technology comprises the following steps of S1, slurry mixing, wherein after a slurry sample is collected, the slurry sample is stored in pile casings, and stored slurry is stirred once every 8 hours; S2, drilling; S3, hole cleaning, wherein after a drill arrives at a designed elevation, a drilling machine stops footage, and is kept rotating at a slow gear in situ to constantly smash soil blocks at a pile tip; S4, installation of the steel pile casings,wherein the steel pile casings are installed after hole forming and adopt multiple sections; S5, making and installation of reinforcement cages; S6, grouting of underwater concrete; and S7, field test and pile body detection. According to the construction technology, the slurry is stirred every 8 hours, specific gravity and other data of the stirred slurry are measured, and the homogeneity and qualification degree of the slurry can be effectively guaranteed; and meanwhile, a quadrangle pile is adopted for control, the drill is aligned with the cross intersection point, and thus the positioning accuracy of drilling can be guaranteed.
Description
technical field [0001] The invention relates to the technical field of mechanical pile construction, in particular to an in-cavity mechanical pile construction process for subway construction. Background technique [0002] Hole-forming detection of bored piles. Under normal circumstances, the cast-in-place pile system refers to the formation of pile holes in the foundation soil by means of mechanical drilling, steel pipe extrusion, or manual excavation on the engineering site, and placing steel cages and pouring concrete in them. And the piles made, according to different hole-forming methods, cast-in-place piles can be divided into several categories such as immersed pipe piles, bored piles and hole-dug piles. Drilling and pouring refers to using a drilling machine to drill a pile hole, and pouring concrete in the hole (or hanging a steel cage in the hole first), and constructing it in the aquifer of the soil according to the drill bit of the drilling machine. It is furthe...
Claims
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Application Information
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