Supporting construction method for miscellaneous fill ultra-deep foundation pit through combination of consolidation grouting and double-row steel pipe piles

A technology for steel pipe piles and deep foundation pits, which is used in infrastructure engineering, sheet pile walls, excavation, etc. The effect of avoiding mud pollution, fast and easy sealing and grouting, good anchoring and reinforcement

Active Publication Date: 2018-09-11
QINGDAO XINHUAYOU CONSTR GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the anchor bolt construction of the filled soil layer, casing drilling or self-advancing anchor bolts are often used. For the miscellaneous fill soil containing obstacles such as block stones and concrete blocks, due to the complex composition, many ob

Method used

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  • Supporting construction method for miscellaneous fill ultra-deep foundation pit through combination of consolidation grouting and double-row steel pipe piles
  • Supporting construction method for miscellaneous fill ultra-deep foundation pit through combination of consolidation grouting and double-row steel pipe piles
  • Supporting construction method for miscellaneous fill ultra-deep foundation pit through combination of consolidation grouting and double-row steel pipe piles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The method of consolidation grouting combined with double-row steel pipe pile support provided in this example includes the following steps:

[0051] (1) Construction of steel pipe piles and grouting retaining structures

[0052] 1. Construction process of steel pipe piles

[0053] Positioning → Drilling machine in place → Drilling → Fabrication and installation of steel pipe piles → Sealing around the steel pipe → Grouting bag sealing pressure grouting.

[0054] 2. The construction process of flower tube grouting

[0055] Positioning → drill in place → drilling → installation of flower tubes → sealing holes around flower tubes → pressure grouting of flower tubes.

[0056] 3. Construction process of crown and beam

[0057] Chiseling pile head → steel bar binding → support formwork → pouring concrete → formwork removal → maintenance.

[0058] 4. Operation points

[0059] 1) Steel pipe material and processing: Steel pipe piles are made of Ф146*5 steel pipes, flower p...

Embodiment 2

[0078] Embodiment 2 application example

[0079] (1) Foundation Pit Support Project of Eastern Hospital of Affiliated Hospital of Qinghai Hospital

[0080] 1.1 Project overview

[0081] The project is located in Laoshan District, Qingdao City, with 4 to 16 floors above ground and 3 floors underground, with an absolute base elevation of 12.45 to 15.45m. The total length of the foundation pit is about 590m, and the excavation depth is 10-16m. On the north side of the foundation pit are the existing outpatient and ward buildings. The multi-storey building adjacent to the foundation pit adopts an independent foundation, with the strongly weathered granite zone as the bearing layer, and the excavation line is only 700mm away from the nearest point of the building. The indoor elevation of the building is 31.95m, and the elevation of the independent foundation base is 23.5-25.5m, that is, the thickness of the miscellaneous fill below the indoor flat is 6.45-8.45m, and below the ind...

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Abstract

The invention discloses a supporting construction method for a miscellaneous fill ultra-deep foundation pit through combination of consolidation grouting and double-row steel pipe piles. The supporting construction method comprises the following steps that firstly, the steel pipe piles and a grouting soil-retaining structure are constructed; and secondly, rear impact self-advancing anchor rods areconstructed. According to the construction method, the problem that supporting piles and walls of an adjacent building cannot be constructed under the situation of the ultra-deep foundation pit withmiscellaneous fill in the upper portion and rock in the lower portion is solved. By utilizing a combined supporting technology, disturbance to the foundation pit is greatly reduced, and the safety ofthe existing building is effectively protected; and the double-row steel pipe piles are adopted to be combined with the pressure grouting technology and the perforated pipe grouting technology, the soil-retaining structure with the large thickness and good stiffness is formed and replaces a traditional row pile and continuous wall soil-retaining structure, and the technique is simple relatively.

Description

technical field [0001] The invention relates to a construction method of super-deep foundation pit consolidation grouting combined with double-row steel pipe piles, which belongs to the technical field of building construction. Background technique [0002] With the increasing density of urban buildings, the difficulty of supporting deep foundation pits under various complex geological conditions is gradually increasing. In engineering, loose backfill soil layers with thicker and high loose coefficients are often encountered, and excavation is likely to cause edge The slope is unstable and has a great impact on adjacent buildings. The support structures of adjacent buildings are generally supported by row piles and diaphragm walls to ensure the safety of adjacent structures. If the upper part is filled with soil and the lower part is hard rock, it is also difficult to construct row piles and diaphragm walls. [0003] For the anchor bolt construction of the filled soil layer...

Claims

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Application Information

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IPC IPC(8): E02D17/04E02D5/28E02D5/74
CPCE02D5/285E02D5/74E02D17/04
Inventor 高原
Owner QINGDAO XINHUAYOU CONSTR GROUP
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