Construction method for carrier pile

Abstract

The invention provides a construction method for a carrier pile. The construction method comprises the steps that 1, a pile casing is sunk into the set depth; 2, a heavy hammer is sunk into the pile casing, the clearance between the heavy hammer and the pile casing can form an airflow channel, and a cement mixture can smoothly pass the airflow channel; 3, material filling and heavy hammer tamping operation are simultaneously conducted, when the heavy hammer is upwards lifted, the bottom end of the heavy hammer does not leave an upper opening of the pile casing, and when the heavy hammer falls to conduct tamping, the bottom end of the heavy hammer is not knocked out of the pile casing so that low-falling-distance small-energy tamping can be ensured; 4, the step 3 is repeated to enable a pile end soil body to be reinforced and compacted; 5, the compactness is controlled through the three-strike penetration or the filler quantity standard, and a pile end carrier is formed; 6, cement paste or cement mortar is poured; and 7, cast-in-place constructing or prefabricating of a concrete pile body is conducted. The construction method for the carrier pile has the technical characteristics and advantages that 1, the tamping mode of the heavy hammer is changed; 2, material filling and heavy hammer tamping are simultaneously conducted by redesigning filler, the heavy hammer and the pile casing; 3, the component of the filler is changed, and the strength of the carrier is improved; and 4, the processes of material filling, tamping and compactness controlling are continuously completed.

Description

technical field [0001] The invention relates to a pile foundation construction technology, in particular to a construction method of a carrier pile. Background technique [0002] Patent No. ZL98101041.5 patent literature discloses a construction technology of concrete piles, which is characterized in that an artificial bearing layer is formed by performing operations such as packing at the bottom of the pile, so that the upper load passes through the concrete pile body and The artificial bearing layer at the bottom of the pile is transferred to the better bearing layer, thereby improving the bearing capacity of the pile. However, some existing problems have also been found in the construction process of this patent: ①A feature of this technology is that the heavy hammer is to ram the bottom of the casing for a certain distance before the filler is expanded, and it is required that the hammer should come out of the casing when the hammer is retracted. The depth of the casing...

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Problems solved by technology

However, some existing problems have also been found in the construction process of this patent: ①A feature of this technology is that the heavy hammer is to ram the bottom of the casing for a certain distance before the filler is expanded, and it is required that the hammer should come out of the casing when the hammer is retracted. The depth of the casing is greater than 50cm. Therefore, when the bearing layer at the pile end is an easily disturbed soil layer, the ramming method of hammering out the casing will cause a large disturbance to the bearing layer, so more fillers need to be rammed. , so that the disturbed soil layer can reach the required compactness. The disadvantages are that the material cost is increased, and the second is that the excessive amount of filler will cause damage to the adjacent piles and cause major quality problems.

②Because the particle size of the construction waste and other fillers used is relatively large, it is necessary to lift the weight out of the upper opening of the casing every time the filler is filled to complete the filler. The energy is high, which increases the disturbance to the bearing layer at the pile end. The second is that it takes a long time to raise the heavy hammer every time, and the process is slow, which greatly reduces the construction efficiency.

③Because the gap between the heavy hammer and the casing is small, its disadvantages are that there is no exhaust channel around the heavy hammer when it is rammed, which will generate air support at the bottom of the hammer, which will affect the hammering energy, and the second is that after the heavy hammer rams out of the casing When it is lifted again, it is still affected by the lack of exhaust channels, and a negative pressure zone will be generated between the bottom of the hammer and the soil, which not only increases the energy required to lift the hammer, but the existence of the vacuum negative pressure zone will also aggravate the formation of groundwater. Resurgence increases construction difficulty and reduces work efficiency

④ Most of the construction waste and other fillers used are demolition bricks or even new bricks. The disadvantages are that clay bricks are used less and less with the development of construction, so that the cost of ramming fillers continues to increase. Second, it is easy to cause construction waste. Secondary pollution

⑤ This technology also includes the process of tamping dry hard concrete, but during the hammer tamping process, the stones in the dry hard concrete are basically rammed into powder by the heavy hammer, which greatly reduces the strength of the dry hard concrete

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