Introduction of cutting pile head?

In order to ensure the quality of pile head during pile foundation construction, it is generally higher than the elevation of pile top. CBI Zhong Da Consulting Company introduced the following information about the cut-off pile head:

brief introduction

During pile foundation construction, in order to ensure the quality of the pile head, it is generally higher than the elevation of the pile top, such as cast-in-place pile: because when pouring concrete, the sediment at the bottom of the pile and the impurities precipitated in the mud will form a certain thickness on the concrete surface, which is generally called laitance. According to the experience, when pouring, it is necessary to over-pour a certain height, which is generally 0.5 meters specified in the Technical Specification for Building Pile Foundation. Can be adjusted according to experience.

Detailed introduction

Then, after the concrete is solidified, the over-poured part will be chiseled to expose the main reinforcement (reinforcement) above the elevation of the pile top, and the pile cap construction will be carried out after the pile foundation inspection is qualified.

Construction mode

Artificial broken pile head:

In fact, breaking piles or pile heads is also very skillful. Some teams use pneumatic pick (air compressor) to cut out the whole section for construction, and some use steel drill to drive into the pile top position. First, the protective concrete on the outside of the steel bar is chiseled out to expose the steel bar, and then the concrete in the steel cage is generally driven into three points along the circumference. Tension is used to separate the upper pile head from the lower part (because concrete has very good compressive strength, but weak tensile strength). Then use a crane or excavator to clean it up.

Mechanical broken pile head:

Since the "French International Construction Machinery Exhibition" in 20 12, the pile driver has been introduced to China to start research, development, production and testing.

The development of pile cutter in China is not smooth sailing, and the nonstandard domestic construction and serious irregular pile diameter are all important obstacles to the popularization of pile cutter. 20 14 party a prohibits the use of hammers in the process of breaking pile heads, and the lack of subsequent mechanical strength is a necessary condition for the popularization of pile breakers. The representative foreign manufacturer is TAETS in Italy; There are enterprises such as Shanghai Shenzhen Mountain Machinery Technology Co., Ltd. in China.

Others:

The same is true for precast piles, except that some precast piles (such as PHC pipe piles) do not need to leak the prestressed reinforcement of the pile body, but insert the prepared reinforcement skeleton into the hollow part and pour it together with the pile cap.

The above is the introduction of the truncated pile provided by Zhong Da Consulting for architects. For more knowledge of architectural terminology, please pay attention to the architectural knowledge column of Zhong Da Consulting.

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