Anti-floating system combining anti-floating cement soil pile and anti-floating anchor rod and construction process of anti-floating system

Abstract

The invention discloses an anti-floating system combining an anti-floating cement soil pile and an anti-floating anchor rod and a construction process of the anti-floating system. The anti-floating system comprises the anti-floating cement soil pile and the anti-floating anchor rod fixedly embedded in the anti-floating cement soil pile, and the top of the anti-floating cement soil pile is connected with the lower surface of a basement bottom plate in a contact mode. The anti-floating anchor rod comprises an anchor cable, an anchor head and an anchor device, wherein the anchor head is arranged in the anti-floating cement soil pile, the anchor cable penetrates through the anti-floating cement soil pile and extends into an anchoring hole in the basement bottom plate, the anchor cable is tensioned, and the anchor device is fixed through grouting. The anti-floating system gives full play to the advantages of the anti-floating cement soil pile and the advantages of the anti-floating anchor rod, a pile and an anchor are integrated and work together, and the anti-floating system is suitable for anti-floating anchor rod construction of various soft soil layers, improves anti-pull force of the anchor rod, prevents hole wall collapse, improves the impervious performance of a connecting node of the basement bottom plate and the anchor rod, expands the use range of the soft soil layers of the anti-floating anchor rod in high-water-level environment, enables construction to be convenient to achieve and can be widely used for anti-floating processing of various underground structures.

Description

technical field [0001] The invention relates to an anti-floating construction technology for an underground structure of geotechnical engineering, in particular to an anti-floating system combined with an anti-floating cement-soil pile and an anti-floating anchor rod and a construction process thereof. Background technique [0002] At present, large and medium-sized cities have begun to develop and utilize underground space on a large scale in order to improve land utilization, such as underground multi-storey large basements, underground civil air defense projects, subways, and underground public pipe networks, all of which have put forward higher requirements for the anti-floating performance of underground structures Require. Due to the buoyancy of groundwater or improper anti-floating measures, the damage of underground engineering is caused, and some of them lead to the damage of the basement floor uplift; [0003] When the burial depth of the basement exceeds the grou...

AI Technical Summary

Problems solved by technology

In view of the above problems, the Chinese invention patent CN101736760B discloses a construction method of prestressed anti-floating anchor rods. The process uses short anchor rods, but in this invention, when the basement floor pulls the anti-floating anchor rods upward, the barbs will exert force on the grouting body. The radial force in the outward direction is easy to crack the grouting body, and the steel bars and barbs are easily eroded by groundwater, which affects the durability of the anchor rod

[0009] (2) The joint between the conventional anti-floating anchor and the basement floor is also a weak link in waterproofing. After the basement floor is poured, the anti-floating anchor that vertically passes through the basement floor will become a channel for groundwater leakage. If the anti-floating anchor and the basement floor Improper waterproofing of connection nodes will cause groundwater to invade the basement upwards along the anchor rod during future use, resulting in leakage in the basement and corrosion of anchor rods and anchors, which will affect the durability of the underground structure

[0010] (3) Conventional anti-floating anchors are less suitable for soft soil layers and loamy soils and sandy soils with relatively loose particles, especially in high groundwater level environments. Due to the relatively loose particles of the above soil layers, hole wall Problems such as collapse, anchor head deformation, out-of-control grouting amount, and failure to deploy anchor cables have greatly restricted the application of anti-floating anchor systems in soft and loose soil layers.

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