Foundation pit supporting method for manual dig-hole cement-soil steel pile

Abstract

A foundation pit supporting construction method for a manual dig-hole cement-soil steel pile comprises the technological processes: manually digging cylindrical pile holes in a side-by-side or interval way; hoisting processed profile steels by a crane and then fixing the profile steels in the holes; pouring cement soil slurry well stirred in a stirrer in the pile holes, performing partial vibrating if necessary, so as to form cement-soil steel piles; manufacturing pile top coupling beams at the tops of the cement-soil steel piles; when foundation pits are deeper, adopting inner supports or detachable anchor rods to compositely support the cement-soil steel piles; hanging nets on the side surfaces of the cement-soil steel piles and then carrying out concrete spray when the foundation pits are dug; dismantling the anchor rods or the inner supports when the backfilling of foundation pit and the trough meets requirements; and finally removing the profile steels for recycle. The method has the advantages of being mainly suitable for hard soil in northern China, such as water-free dense sand gravel stratums where machinery construction is not available or the stratum suitable for manually digging, and being reduced in cost; the manual digging is economical and easy to implement; and the quality and construction period are ensured and the environment is protected.

Description

technical field [0001] The invention belongs to a foundation pit support method in building foundation construction, in particular to an artificially dug hole cement-soil type steel pile and a construction process thereof. The strata that the present invention is suitable for are mainly aimed at relatively hard soil strata in the northern region, such as dense sand and pebble strata without groundwater, where mechanical construction is relatively difficult or strata that are suitable for artificially digging holes after pumping. Background technique [0002] At present, the SMW (cement-soil mixing wall) construction method is widely used in soft soil areas because of its energy-saving, environmental protection and reliable quality. The rate can reach 100%. The three-axis mixer equipment has high power, high efficiency, large construction depth, reliable quality, and increasingly widely used. However, the application in hard ground such as the Beijing area is still extremel...

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Problems solved by technology

[0005] Currently commonly used rotary drilling methods, positive and negative circulation drilling methods, long helical drilling methods, including percussion drilling methods are not only low in efficiency, even impossible to implement, but also become unnecessary, and what’s more, the working face is small , the working space is very short, and construction equipment cannot enter the construction work surface

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