When it comes to pile foundation hole testing, construction professionals are still relatively unfamiliar with it. What is the self-balancing method for pile foundation testing? What’s the basic overview? The following is the basic content of the self-balancing method for detecting pile foundations compiled by Zhongda Consulting for construction professionals. The specific content is as follows:
Zhongda Consulting sorted out the self-balancing method for detecting pile foundations through the knowledge collection in the construction knowledge column of this website. The relevant content, the basic overview is as follows:
What is the self-balancing method pile foundation inspection?
The self-balancing method is different from the traditional stacking method and anchor pile method. During the construction process, a load box shaped and made according to the pile bearing capacity parameters is placed at the bottom of the pile body and connected to apply pressure. The oil pipe and displacement measuring device are installed on the top of the pile. After the concrete is cured to a standard age, the top high-pressure oil pump applies pressure to the bottom load box to obtain the pile end bearing capacity and pile side total friction.
Basic principles of self-balancing method for detecting pile foundations:
According to the existing verifiable archival records, the pre-buried piles are currently dubbed the "self-balancing method" in China. The method of testing the bearing characteristics of pile foundations using loading equipment was first proposed and implemented by the Israeli company AfarVasela in the 1960s. According to patent information, this method is called "a new bearing capacity testing method" and is commonly known as the "Tongmo static load method".
The detection principle is to bury a special loading device, a load box, together with the steel cage at the corresponding position in the pile before the concrete is poured, and insert the pressurized tube of the loading box and The required additional testing equipment is brought from the pile body to the ground and then poured into the pile. A pressurized pump acts as a load box on the ground to pressurize and load, causing a loading force to be generated inside the pile. By calculating and analyzing the relationship between the loading force and these parameters, we can not only obtain the bearing capacity of the pile foundation, but also obtain the load capacity of each pile. This method can be used to provide data basis for design, and can also be used to test the bearing capacity of engineering piles.
Relevant equipment for self-balancing method to detect pile foundations:
Load box - as the name implies, in the early stage of pile foundation testing, a series of data such as the specific tonnage of the pile, pile foundation, and hole depth are required. Specify the corresponding load box suitable for the test in advance, and weld the load box and the steel cage together in the early stage of pouring concrete into the pile, and finally bury them together in the pile at the corresponding position and pour concrete at the end;
Combined type Load box
Diversion structure—During the process of pouring concrete (especially in the case of underwater pouring), since the load box is placed inside the pile, it will block the flow of concrete to a certain extent. It is easy to form a weak layer at the load box, which affects the quality of the pile and the test results.
Tongmo load box adopts two measures to perfectly solve this problem: first, pre-cast high-strength concrete on the surface of the pressurized body to ensure that there is no gap between the pressurized surface of the load box and the concrete body. Combined. Secondly, a conical flow guide is placed in the lower part of the load box (or the upper part in the case of large-diameter piles), which can smoothly guide the fluid when the concrete passes through the load box level;
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