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Core-grouting reinforcing construction method for prestressed concrete pipe piles with post-grouting method
The invention provides a core-grouting reinforcing construction method for prestressed concrete pipe piles with a post-grouting method. The method comprises the following construction steps: determining the depth of the defect position of a pile body, and then cleaning holes with compressed air or high-pressure water until the required hole cleaning depth; setting the number of steel strands or reinforcing bars according to the computing requirement, putting down the steel strands or the reinforcing bars to the computed core grouting length, exposing more than 2m out of a pile top for putting-down control or a bearing capacity test for the steel strands or the reinforcing bars, and then using a 6-8mm steel plate as the bottoming thickness; adopting two welded steel pipes as grouting pipes, namely a primary grouting pipe and a secondary grouting pipe; selecting powder-free gravel with the uniform grain sizes Phi being 10-20mm and the compressive strength larger than M30 as a gravel material, and backfilling the gravel material to orifices; before grouting, cleaning holes with pressed water for the primary grouting pipe until backwater is clean; then respectively carrying out primary grouting and secondary grouting. The method has the advantages of being convenient to operate, low in cost and high in construction speed, can improve the quality of the pile body and the bearing capacity of a single pile, and ensures the whole project quality.
Core-grouting reinforcing construction method for prestressed concrete pipe piles with post-grouting method
The invention provides a core-grouting reinforcing construction method for prestressed concrete pipe piles with a post-grouting method. The method comprises the following construction steps: determining the depth of the defect position of a pile body, and then cleaning holes with compressed air or high-pressure water until the required hole cleaning depth; setting the number of steel strands or reinforcing bars according to the computing requirement, putting down the steel strands or the reinforcing bars to the computed core grouting length, exposing more than 2m out of a pile top for putting-down control or a bearing capacity test for the steel strands or the reinforcing bars, and then using a 6-8mm steel plate as the bottoming thickness; adopting two welded steel pipes as grouting pipes, namely a primary grouting pipe and a secondary grouting pipe; selecting powder-free gravel with the uniform grain sizes Phi being 10-20mm and the compressive strength larger than M30 as a gravel material, and backfilling the gravel material to orifices; before grouting, cleaning holes with pressed water for the primary grouting pipe until backwater is clean; then respectively carrying out primary grouting and secondary grouting. The method has the advantages of being convenient to operate, low in cost and high in construction speed, can improve the quality of the pile body and the bearing capacity of a single pile, and ensures the whole project quality.
Core-grouting reinforcing construction method for prestressed concrete pipe piles with post-grouting method
ZHAO HAILIAN (author) / LI XINGE (author) / HUANG JUHUA (author) / HUANG YI (author)
2016-01-06
Patent
Electronic Resource
English
IPC:
E02D
FOUNDATIONS
,
Gründungen
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