Deep foundation pit underground structure anti-floating system and construction process

Abstract

The invention relates to a deep foundation pit underground structure anti-floating system and a construction process. The deep foundation pit underground structure anti-floating system comprises pulling anchor piles, net spraying structures and U-shaped water guiding grooves, wherein the net spraying structures are arranged between the anchor piles, the U-shaped water guiding grooves are formed inthe ends of the pulling anchor piles, and a drainage pipe is arranged on the net spraying structures and penetrates through a soil body, so that water flows to the U-shaped water guiding grooves through the drainage pipe, and the water guiding grooves are collected to a water collecting well; and a waterproof layer is arranged at the bottom of the anchor piles and a raft plate, one ends of waterstop screws are anchored on the anchor piles or sprayed on the soil body, a bottom plate is connected with the anchor piles, and side wall plates are also connected with the anchor piles. According tothe deep foundation pit underground structure anti-floating system, the anti-floating capability is effectively enhanced, the damage possibility of the bottom plate and the side wall plates are reduced, space narrow backfill construction and template construction on the outer side walls of the side wall plates are avoided, waste of a supporting structure is avoided, temporary primary investment of earthwork excavation and side modulus and the supporting structure is reduced, and the problems of narrow side wall outer construction space, insufficient structural anti-pull force, excessive sidewall water pressure excessive cracking damage and the like are well controlled and solved.

Description

technical field [0001] The invention relates to the field of anti-floating technology for underground structures, in particular to an anti-floating system and construction technology for underground structures in deep foundation pits, which realizes that deep foundation pit support structures use anti-floating anchor rods as anchor cables to stabilize the foundation pit, and at the same time Connect the anti-floating anchor rod with the side wall plate to enhance the anti-floating ability and effect, reduce the temporary one-time investment of earthwork excavation, side modulus and support structure, and greatly reduce the construction cost. Background technique [0002] In deep foundation pit basements, underground sewage treatment plants and other underground structures, due to the high groundwater level, it is often affected by the rainy season, and anti-floating considerations are often required. However, in actual construction, due to cost and design professional constra...

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Problems solved by technology

[0003] (1) The underground structure is close to the deep foundation pit support pile structure, the construction space is narrow, the backfill quality cannot be guaranteed, or it needs to be backfilled with expensive materials such as sand and stone, plain concrete, and modified soil

[0004] (2) When the side wall panels of underground structures are relatively large and thin, and the reinforcement is insufficient, the water level rises due to rainy seasons, etc., and the side wall panels are subject to high water pressure, bending and deformation, and prone to swelling and water leakage

[0005] (3) For the anchor pile support structure, as a temporary support, the investment cost is high, and there is too little consideration for the subsequent permanent use structure, and the economic applicability is low

[0006] (4) For deep foundation pits, underground structures only rely on the anti-floating anchor rods installed on the floor. Affected by water level fluctuations, it will cause certain drawing fatigue damage to the bottom plate, or even crack the bottom plate concrete, which will affect the anti-floating stability of the structure. have a greater impact

[0007] (5) The construction space for the formwork support on the outer wall of the underground structure is narrow, and the formwork operation and waterproof construction are difficult, which will greatly increase the construction cost

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