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A construction method of bored pile
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A technology of bored piles and construction methods, applied in sheet pile walls, foundation structure engineering, conjugated synthetic polymer artificial filaments, etc., can solve problems such as shortened service life of steel cages and reduced bearing capacity of pile foundations, and achieve The effect of long service life and good corrosion resistance
Active Publication Date: 2020-12-22
浙江立鹏建设有限公司
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Problems solved by technology
[0004] The above-mentioned construction method of bored cast-in-place piles has the following technical problems: the formed cast-in-place piles are located underground, and moisture can easily pass through the concrete and come into contact with the reinforcement cage, which will shorten the service life of the reinforcement cage and reduce the bearing capacity of the pile foundation, which needs to be improved
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Embodiment 1
[0039] A construction method for bored piles, such as figure 1 shown, including the following steps:
[0040] (1) Level the site, remove debris and determine the pile position; (2) Double power head casing drilling rig is in place; (3) Start the drilling rig, the casing will be drilled with the drill pipe to support the hole wall, and the drill pipe will be taken out after the hole is formed (4) lowering the reinforcement cage and installing the conduit; (5) pouring concrete; (6) pulling out the casing; (7) checking the quality of the pile.
[0041] The concrete includes a rust inhibitor accounting for 1.2% of the cement content. The rust inhibitor includes 40% N,N-dimethylethanolamine, 8% sodium monofluorophosphate, and the balance is water.
Embodiment 2
[0043] A construction method for bored piles, such as figure 1 shown, including the following steps:
[0044] (1) Level the site, remove debris and determine the pile position; (2) Double power head casing drilling rig is in place; (3) Start the drilling rig, the casing will be drilled with the drill pipe to support the hole wall, and the drill pipe will be taken out after the hole is formed (4) lowering the reinforcement cage and installing the conduit; (5) pouring concrete; (6) pulling out the casing; (7) checking the quality of the pile.
[0045] The concrete includes a rust inhibitor accounting for 1.2% of the cement content. The rust inhibitor includes 45% N,N-dimethylethanolamine, 5% sodium monofluorophosphate, and the balance is water.
Embodiment 3
[0047] A construction method for bored piles, such as figure 1 shown, including the following steps:
[0048] (1) Level the site, remove debris and determine the pile position; (2) Double power head casing drilling rig is in place; (3) Start the drilling rig, the casing will be drilled with the drill pipe to support the hole wall, and the drill pipe will be taken out after the hole is formed (4) lowering the reinforcement cage and installing the conduit; (5) pouring concrete; (6) pulling out the casing; (7) checking the quality of the pile.
[0049] The concrete includes a rust inhibitor accounting for 1.2% of the cement content. The rust inhibitor includes 43% N,N-dimethylethanolamine, 7% sodium monofluorophosphate, and the balance is water.
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Abstract
The invention discloses a construction method of a cast-in-situ bored pile, and relates to pile foundation engineering. The construction method is characterized by comprising the following steps: (1)a site is levelled, and a pile position is determined; (2) a dual-power-head casing drilling rig is in place; (3) the drilling rig is started, hole forming and casing burying are completed, and then adrill rod is taken out; (4) a reinforcement cage is lowered; (5) concrete is poured; (6) a casing is pulled out; and (7) the pile forming quality is checked, wherein the concrete comprises a corrosion inhibitor accounting for 1.2% of the cement doping amount, and the corrosion inhibitor is prepared from the components in percentage by weight: 40-45% of N, N-dimethylethanolamine, 5-8% of sodium monofluorophosphate and the balance of water. The corrosion inhibitor doped in the concrete can protect the reinforcement cage well, thus the structural strength of the reinforcement cage is not prone to being lowered, then the service life of a pile foundation is prolonged, and meanwhile the construction method has the advantages that the environment is not polluted, and the concentration of chloride ions is not required.
Description
technical field [0001] The invention relates to pile foundation engineering, in particular to a construction method for bored piles. Background technique [0002] Cast-in-situ pile refers to the pile hole formed in the foundation soil by means of mechanical drilling, steel pipe extrusion or manual excavation on the project site, and a steel cage is placed in it and concrete is poured into it. According to different hole-forming methods, cast-in-place piles can be divided into immersed pipe cast-in-place piles, bored cast-in-place piles, and hole-dug cast-in-place piles, etc. The hole-forming process of bored cast-in-place piles is realized by drilling rigs. In order to prevent the hole wall from collapsing during the drilling process, it is often necessary to bury a retaining wall. Because of the difference in the formation of the selected retaining wall, it is divided into a mud retaining wall construction method and a full casing construction method. [0003] The Chinese ...
Claims
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Application Information
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