External diagonal-pulling and internal diagonal-bracing herringbone foundation pit supporting pile and construction method thereof

Abstract

Provided is an external diagonal-pulling and internal diagonal-bracing herringbone foundation pit supporting pile. The external diagonal-pulling and internal diagonal-bracing herringbone foundation pit supporting pile is characterized by being composed of an internal diagonal-bracing pile, an external diagonal-pulling pile and a top crown beam; the internal diagonal-bracing pile is a reinforced concrete pouring pile or a precast pile which inclines towards the wall of a foundation pit by 10-35 degrees, the diameter of the internal diagonal-bracing pile is 400-1000mm, the length of the internal diagonal-bracing pile is 10-35m, the external diagonal-pulling pile is a wire rope cemented soil rotary jet grouting anchor pile or a reinforced concrete pouring pile which inclines towards the interior of the foundation pit by 20-70 degrees, the diameter of the external diagonal-pulling pile is 200-900mm, the length of the external diagonal-pulling pile is 10-40m, and the internal diagonal-bracing pile and the external diagonal-pulling pile are connected through the top crown beam. Compared with the prior art, the external diagonal-pulling and internal diagonal-bracing herringbone foundation pit supporting pile has the advantages that the construction process is simple, the foundation pit support is stressed more reasonably, the manufacturing cost is lower, the safety degree of the foundation pit is high, no internal support exists in the foundation pit, soil can be largely excavated conveniently, and the pile can be used in soft soil areas of national eastern coastal cities and can also be used in national area with the good soil property.

Description

technical field [0001] The invention relates to the field of building foundation engineering, in particular to a herringbone-shaped foundation pit support pile with external cable stay and internal diagonal support and a construction method thereof. Background technique [0002] As we all know, most coastal cities in my country belong to soft soil foundation, which is silt or silty soil within 20 meters near the surface. In the foundation pit support of the 1-2 layer basement with an excavation depth of 5-10m, bored piles are mostly used for support. Rows of piles plus internal braces or diagonal braces; or a rigid frame of two rows of straight piles along the periphery of the foundation pit. Although the former is safe and reliable, it is expensive and inconvenient for earthwork excavation and construction; the latter is low in cost, but the foundation pit The displacement of the wall into the pit is large, and the safety of the foundation pit is low. Contents of the invent...

AI Technical Summary

Problems solved by technology

[0002] As we all know, most coastal cities in my country belong to soft soil foundation, which is silt or silty soil within 20 meters near the surface. In the foundation pit support of the 1-2 layer basement with an excavation depth of 5-10m, bored piles are mostly used for support. Rows of piles plus internal braces or diagonal braces; or a rigid frame of two rows of straight piles along the periphery of the foundation pit. Although the former is safe and reliable, it is expensive and inconvenient for earthwork excavation and construction; the latter is low in cost, but the foundation pit The displacement of the wall into the pit is large, and the safety of the foundation pit is low

Images