Pneumatic down-the-hole hammer vibration jet grouting pile inserted steel pipe composite foundation and pile foundation construction method
A construction method and technology for composite foundations, which are applied in basic structure engineering, sheet pile walls, buildings, etc., to achieve the effect of saving the use of reinforced concrete, saving time and effort, labor and money, and ensuring bearing capacity and settlement deformation.
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Embodiment 1
[0035] Ground grouting reinforcement design for Building A of Block C2 Financial Project of Shijingshan Yinhe Business District K
[0036] 1. Design conditions
[0037] Tower A is ±0.00=70.50m, the natural ground elevation is temporarily taken as 66.0m, the foundation top elevation of the core tube is -22.50m, and the foundation thickness is 2.50m, and the foundation top elevation of other parts is -22.50m, and the foundation thickness is 0.80m.
[0038] According to the "Supplementary Explanation of the Geotechnical Engineering Survey Report of C2 Financial Project of Block K in Shijingshan Yinhe Business District", the base of Block A is ④ broken zone layer, and the bearing capacity and settlement cannot meet the design requirements. According to the requirements of the design institute, the broken zone is now carried out. Grouting reinforcement, while dealing with cave filling problems, to meet the design requirements.
[0039] According to the foundation reaction diagram ...
Embodiment 2
[0049] A tunnel pile project in Chongqing, because the tunnel has to pass through a deep ditch with land filling section, the deep ditch is filled with various boulders, boulders, and riprap, with a depth ranging from 3 to 20m. In order to ensure uniform settlement, the The tunnel with a height of ~4.8m is designed with red cloth piles. The number of piles is 2188, the pile diameter is 600mm, the spacing is 1.7m*1.7m, and the pile length is 4-22m. . This poses a great challenge to the construction unit. Firstly, the height of the equipment should not exceed 3m, and secondly, it should be able to break through the fill layer of rocks, boulders, boulders and ripraps, then lower it into a steel cage, and pour concrete into piles. Later, considering the construction restrictions of ultra-low rotary excavation and reverse circulation drilling rigs, it was changed to 998 piles with a diameter of 1m.
[0050] For this reason, we proposed to use a low-slung pneumatic down-the-hole h...
Embodiment 3
[0052] Pile foundation construction in a limestone stratum in Guangzhou, a small high-rise building with 9 to 11 floors above the ground. I chose the percussion drilling method. When encountering inclined holes or karst caves, I backfilled the rubble, and then impacted through holes again for treatment. Some piles with a diameter of 800mm and a length of 45m had not been drilled in 5 months. The construction party was anxious, and the construction party also Complaining is difficult, losing money, and claiming compensation. The design institute also said that it can only be so. All three parties are caught in a vortex of contradictions, and everyone is worried about the slow progress, but they cannot come up with a good solution.
[0053] For this reason, we propose to use the pneumatic down-the-hole hammer vibrating rotary grouting pile drilling rig for construction, and use one pile to support one pile (if necessary, multiple piles can be used to support one pile). The diam...
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