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How to deal with the deviation hole problem in the construction of rotary digging drill?
1.The sharp deviation hole is generally caused by geology. Due to the weathering degree of rock layer, uneven rock distribution, etc., the drill pipe is suddenly stuck when the main roll reaches a certain position in the hole, or the drill pipe suddenly leans to one side, indicating a sudden dev...Read more -
Is cement soil pile reliable as a foundation pit support method?
Cement soil wall is a non mainstream form of support structure, suitable for narrow soil conditions, and not widely used in practical engineering applications.Cement earth walls are generally used in soft soil foundation pits with small depths.Under these conditions, the anchor rod does not have ...Read more -
Skills for dealing with several special problems in manual bored pile construction
Manual bored pile construction is convenient, does not require large machinery and equipment, and is cost-effective. Therefore, it is widely used in roads and civil buildings. However, the underground working conditions of bored piles are poor, the environment is harsh, and the labor intensity is...Read more -
Two technical methods for improving the bearing capacity of bored piles
At present, the commonly used technical methods to improve the vertical bearing capacity of a single cast-in-place pile include the expansion method and the grouting method after drilling the cast-in-place pile. In the same stratum, the pile end resistance is directly proportional to the pile end...Read more -
How is the diaphragm wall constructed
Diaphragm wall is a diaphragm wall with anti-seepage (water) retaining and load-bearing functions, formed by excavating a narrow and deep trench underground with the help of excavation machinery and mud protection, and constructing suitable materials such as reinforced concrete in the trench. It ...Read more -
Construction technology of long spiral bored pile
1、 Process characteristics: 1. Long spiral drilled cast-in-place piles generally use superfluid concrete, which has good flowability. Stones can suspend in the concrete without sinking, and there will be no segregation. It is easy to put it into a steel cage; (Superfluid concrete refers to conc...Read more -
Key points for implementing pile foundation testing
The starting time of pile foundation testing should meet the following conditions: (1) The concrete strength of the tested pile should not be lower than 70% of the design strength and should not be lower than 15MPa, using strain method and acoustic transmission method for testing; (2) Using the c...Read more -
7 methods for pile foundation testing
1. Low strain detection method The low strain detection method uses a small hammer to strike the pile top, and receives stress wave signals from the pile through sensors bonded to the pile top. The dynamic response of the pile-soil system is studied using stress wave theory, and the measured velo...Read more -
Reasons and preventive measures for causing steel cage to float up
The reasons for causing the steel cage to float up are generally: (1) The initial and final setting times of concrete are too short, and the concrete clumps in the holes are too early. When the concrete poured from the conduit rises to the bottom of the steel cage, the continued pouring of concre...Read more -
Introduction to CFG pile
CFG (Cement Fly ash Grave) pile, also known as cement fly ash gravel pile in Chinese, is a high bonding strength pile formed by uniformly mixing cement, fly ash, gravel, stone chips or sand and water in a certain mix proportion. It forms a composite foundation together with the soil between the p...Read more -
Construction method of drilling bore piles with rotary drilling rig in hard limestone formations
1. Preface Rotary drilling rig is a construction machinery suitable for drilling operations in building foundation engineering. In recent years, it has become the main force in pile foundation construction in bridge construction in China. With different drilling tools, rotary drilling rig is suit...Read more -
Construction technology of offshore deepwater steel pipe piles
1. Production of steel pipe piles and steel casing The steel pipes used for steel pipe piles and the steel casing used for the underwater part of boreholes are both rolled on site. Generally, steel plates with a thickness of 10-14mm are selected, rolled into small sections, and then welded into ...Read more
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