Multi-direction analysis of drilling holes for precast piles and drill pipes for cast-in-place piles

by:Ronix Tools     2021-06-26
11-28 15:45:05 According to different construction methods, piles can be divided into precast piles (prestressed pipe piles) and cast-in-place piles (drill-pipe cast-in-place piles). Both are widely used in soft soil foundations and deep-buried foundations. They have the characteristics of high bearing capacity, good stability, small settlement, and low material consumption. They can effectively meet the requirements of buildings for foundation strength, deformation and stability. The two types of piles have their own characteristics, different construction methods, different mechanical equipment and construction techniques, the mechanism of action of the pile and the soil are different, and the scope of application is also different. This article will compare these two types of piles, analyze their advantages, disadvantages and applicability, so as to determine whether to choose pre-stressed pipe piles or bored piles. Prestressed pipe pile is a hollow pipe slender concrete prefabricated component made by pre-tensioning technology, adding high-efficiency water reducing agent, high-speed centrifugal steam curing molding method, mainly composed of cylindrical pile, end plate and steel hoop . . Bored pile is a pile made by using a drill to electric drill a hole in the soil at the project site, digging a slag hole on the side of the broken soil, and then placing the steel frame in the pile hole, and then pouring concrete into the pile. The prestressed pipe piles and bored piles are compared and analyzed from the perspectives of mechanism, construction conditions, construction technology and construction cost. From the mechanism point of view, the pre-stressed pipe pile enters or enters the foundation through the pressure of the drill pipe to achieve the required depth. During the process of the pile, the surrounding soil around the pile body is squeezed out, causing pore water pressure and uplift in a short time. When squeezing the soil laterally, the stress will affect the scope of the existing buildings, the content and deformation of the road, and even damage it. At the same time, it will squeeze the completed construction pile to make it drift and float. pipe bored piles are made by dry method or mud retaining method. During the process of pore formation and pile formation, there is no squeezing effect between surrounding piles on the soil, and it will not cause an increase in excessive pore water pressure in the soil. Therefore, the construction of piles will not endanger the safety of adjacent buildings and roads. Therefore, compared with prestressed pipe piles, bored piles have the characteristics of no vibration, no compaction, and less impact on surrounding buildings, but the concrete strength of the pile body is lower, the bearing capacity of the single pile is lower, and the settlement Larger. From the construction conditions, prestressed pipe piles are suitable for soft soil, sandy soil, plastic soil, silty soil, fine sand and loose gravel soil, without boulders or floats. It does not easily penetrate into thick sand and other hard interlayers, and can only enter the depth of sand, gravel, hard clay, strongly weathered rocks and other solid supporting layers. When it is difficult to piling in sand, boulders, etc., pilot holes can be used. When driving or statically pressing a prestressed pipe pile and using a strongly weathered rock layer as the supporting layer of the pile foundation, the pile body will pass through most of the weak soil, cohesive soil and weathered rock layer, so there will be no resistance to the pile body. Big. For example, local leaching and the distribution of isolated rocks in the entire clastic rock may cause some difficulties in the formation of piles. Because construction requires large-scale machinery such as vibrating pile hammers and lifting equipment, the required construction site is relatively large. pipe cast-in-place piles are suitable for various sandy soils and cohesive soils, as well as gravel and cobblestone soils and rock formations. However, it is difficult to construct silt and foundations that may have flowing sand or pressurized water. Therefore, compared with prestressed pipe piles, bored piles have the characteristics of simple construction equipment, convenient operation, and freedom from site restrictions, but the construction period is longer than prestressed pipe piles and the construction quality is unstable. From the perspective of construction technology, the construction technology of prestressed pipe piles is: measurement and positioning → placement and centering of the pile machine → pile pressing → pile addition → pile delivery or cutting → static pressure pile to reach the design elevation. (1) Measurement and positioning: Place the shaft and each pile before construction, and paint to make the mark obvious. (2) The placement and alignment of the pile driver: the pile driver is used to start the theodolite
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