Method for detecting vertical bearing capacity of pile foundation

Abstract

The invention provides a method for detecting the vertical bearing capacity of a pile foundation. When vertical static load detection in vertical bearing capacity of the pile foundation is conducted, the method includes the steps that (1) a detecting part used for detecting the bearing capacity is installed at the top of the pile foundation to be detected; (2) a girder used for detection is installed at the top of the detecting part; (3) one or more lifting parts are arranged on the girder used for detection, and a medium container for weight balancing is lifted through the lifting parts; (4) media corresponding to a required load are injected into the medium container; (5) the detecting part is used for conducting vertical bearing capacity detection. When the method is used for conducting single pile pulling resistance detection, the lifting and weight-balancing mode is also used. The method has the advantages of being simple and convenient to operate, high in safety, wide in application range and the like.

Description

technical field [0001] The invention mainly relates to the field of engineering detection in construction engineering, in particular to a method for detecting the vertical bearing capacity of pile foundations. Background technique [0002] With the rapid development of the construction industry and marine economy, the continuous advancement of sea reclamation projects and the large increase of bridge projects in traffic, more and more construction projects use pile foundations, and the requirements for the vertical bearing capacity of single piles of pile foundations are also increasing. come higher. At the same time, with the widespread use of pile foundations, the ever-changing construction conditions and the influence of human factors, it is often difficult to effectively guarantee the quality of the pile body and the bearing capacity of a single pile in engineering practice. Major engineering quality accidents caused by pile quality or foundation bearing capacity occur ...

AI Technical Summary

Problems solved by technology

[0004] 1. The disadvantages and deficiencies of the stacking method are: the required static load counterweight is large, the amount is large, the counterweight platform and support are heavy, and the workload of transportation, installation and dismantling is huge, the labor intensity of the testing personnel is extremely high, the safety is poor, and the testing It takes a long time and the cost of testing is high; and it is often impossible to perform normal testing due to limitations of transportation, site and natural conditions

[0005] 2. The disadvantage of the ordinary anchor pile method is that two to four anchor piles must be dug around the engineering pile to be inspected, which greatly increases the inspection cost and inspection preparation time of the pile foundation

[0006] 3. The disadvantages and deficiencies of the deep well in-situ detection method are: only the bearing capacity of the foundation can be detected, and then the theoretical calculation can be made based on the pile diameter, the concrete strength of the pile body and the quality of the pile body, and the vertical compressive bearing capacity of the pile foundation cannot be directly detected It cannot be used for the detection of bored piles, rotary excavation piles, vibrating cast-in-situ piles, Luoyang shovel piles, pipe piles and prestressed pipe piles that cannot be tested in situ in deep wells, let alone for the pullout detection of piles

[0007] 4. Disadvantages and deficiencies of the self-anchoring method and self-balancing method: it is not suitable for the vertical load bearing of vibrating cast-in-situ piles, hammered cast-in-place piles, drilled piles, rotary excavated piles, Luoyang shovel piles, prestressed pipe piles and prefabricated pipe piles force detection

[0008] 5. The disadvantage of the hoop method is that it can only be used for the pullout detection of pipe piles, and because the method is to apply a huge positive pressure on the outside of the pipe pile, the friction between the hoop method and the pile wall (that is, the pullout resistance Force F)

The hoop and pressurizing equipment are difficult to process, and at the same time, it is easy to damage the pile head due to excessive local pressure. The safety and reliability of the detection are low, and there is no promotion value

[0009] For this reason, another practitioner proposed "a static load detection method for pile foundations". Although this invention overcomes the shortcomings and deficiencies of the first five detection methods, it can be applied to the vertical bearing capacity of pile foundations in various sites. Compression and pullout testing, but because this method uses the principle of three-dimensional stress, the processing of the pullout rods and the treatment of the pile heads used for testing must be handled in a timely manner on site, and the construction technology for the pullout rods and carbon fiber is relatively high, and the material requirements are also high. Very high, causing difficulties in the implementation process and making promotion difficult

Especially for the static load detection of pile foundations in rivers, rivers, lakes and sea water, the detection cost will be greatly increased due to the difficulty of loading, and it will also make the implementation very difficult

Images