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CN-122013764-A - Construction process and foundation structure for constructing prestressed concrete pipe piles in low-temperature laboratory

CN122013764ACN 122013764 ACN122013764 ACN 122013764ACN-122013764-A

Abstract

The application relates to the field of building construction, in particular to a construction process and a foundation structure for constructing a prestressed concrete pipe pile in a low-temperature laboratory. The pile foundation comprises a pile end bearing layer, a site obstacle cleaning layer, a protective measure, pile test acquisition parameters, pile piling, pile sinking by hammering or static pressure method, real-time monitoring, pile segment re-pressing under the condition of exceeding a threshold value, welding connection, detection and acceptance, a foundation structure, a pile body arranged in a foundation pile sinking pile, a pulling-resistant pile fixed in the pile by micro-expansion concrete, and at least three steel bars with bottom plates in the pulling-resistant pile. The application achieves the technical effects of ensuring the normative, safe and efficient construction process of the low-temperature laboratory prestressed concrete pipe pile, improving the stability and the pulling resistance of the foundation structure of the pipe pile and ensuring the construction quality and the safety of a building.

Inventors

  • DENG ZHIWEN
  • HUANG GUANCHENG
  • CHEN YIPENG
  • LI YU
  • Xiao jinshui
  • HONG DONGMING
  • WANG JIAN
  • CHEN YIQIAO
  • CEN BOYANG
  • LIANG JUN
  • FU WEIJIE
  • TAN JINGCHENG

Assignees

  • 广东省建筑工程集团控股有限公司
  • 广东省建筑工程集团有限公司

Dates

Publication Date
20260512
Application Date
20260403

Claims (10)

  1. 1. The construction process for constructing the prestressed concrete pipe pile in the low-temperature laboratory is characterized by comprising the following steps of: S1, determining a pile end bearing layer as a fully weathered or strongly weathered granite layer; s2, cleaning obstacles in a construction site and adjacent areas; S3, when the piling operation affects the adjacent building, setting a damping structure or a soil-squeezing structure as a protective measure; s4, pile sinking construction parameters are obtained through executing non-engineering pile test; S5, stacking the tubular pile body (2), wherein stacking comprises a single-layer or stacked mode, and a skid is arranged at the position about 1/5 pile length away from the pile end in the length direction of the tubular pile and the outer edge tubular pile is fixed when stacking; S6, pile sinking is carried out by adopting a hammering method or a static pressure method, and the floating quantity and deviation of the pile body are monitored in real time in the pile sinking process; S7, when the floating quantity exceeds a preset threshold value or the deviation exceeds an allowable range, performing re-pressing by adopting a static pile machine; S8, connecting the tubular pile segments in a welding mode, controlling the dislocation deviation of the tubular pile segments, and carrying out multilayer multi-pass welding and natural cooling on the welding seams; And S9, detecting acceptance includes acceptance of pile body verticality, plane position and elevation, and executing single pile bearing capacity test and pile body integrity detection.
  2. 2. The construction process of the low-temperature laboratory construction prestressed concrete pipe pile according to claim 1, wherein said predetermined threshold is 5mm and said allowable range is not more than 0.5%.
  3. 3. The construction process of the low-temperature laboratory construction prestressed concrete tubular pile according to claim 1 or 2, wherein the shock absorbing structure comprises a shock absorbing trench, and the depth of the shock absorbing trench is 2 to 3 meters.
  4. 4. The construction process of the low-temperature laboratory construction prestressed concrete tubular pile according to claim 1 or 2, wherein the soil-reducing structure is a driven soil-squeezing-preventing steel sheet pile.
  5. 5. The construction process of the low-temperature laboratory construction prestressed concrete pipe pile according to claim 1, wherein the section height of the skid is larger than the outer diameter of the pipe pile when stacked.
  6. 6. The construction process for constructing a prestressed concrete tubular pile in a low-temperature laboratory according to claim 1, wherein when a pile is driven by a hammering method, a hammer pad is provided between a pile hammer and a pile cap, and an elastic packing is provided between the pile cap and the tubular pile.
  7. 7. The construction process of the low-temperature laboratory construction prestressed concrete pipe pile according to claim 6, wherein the verticality deviation of the first pipe pile is controlled to be within 0.5% when the pile is driven by the hammering method.
  8. 8. The construction process of the low-temperature laboratory construction prestressed concrete pipe pile according to claim 1, wherein when the pile is driven by a static pressure method, the site foundation is reinforced before the construction to ensure sufficient bearing capacity.
  9. 9. The prestressed concrete pipe pile foundation structure is characterized in that a pipe pile body (2) is arranged in the foundation (1) through hammering or static pressure pile sinking, and a uplift pile (3) is fixedly arranged in the pipe pile body (2) through micro-expansion concrete (4).
  10. 10. The prestressed concrete tubular pile foundation structure according to claim 9, characterized in that at least three steel bars are arranged inside the uplift pile (3), and a bottom plate (5) is arranged at the bottom end of the steel bars.

Description

Construction process and foundation structure for constructing prestressed concrete pipe piles in low-temperature laboratory Technical Field The application relates to the field of building construction, in particular to a construction process and a foundation structure for constructing a prestressed concrete pipe pile in a low-temperature laboratory. Background In the field of building engineering, pile foundation construction is a key link for guaranteeing the stability and safety of a building. With the continuous development of the building industry, the construction requirements of various special buildings are increasing, such as low-temperature laboratory construction. Cryogenic laboratories have extremely high demands on the stability and durability of the foundation, as the cryogenic environment may have additional effects on building structures, such as material shrinkage, freeze-thaw cycles, and the like. The prestressed concrete pipe pile has the remarkable advantages of high bearing capacity, high construction efficiency, good economy and the like, and is widely applied to pile foundation construction of various building projects including low-temperature laboratory construction. The method provides a solid and stable foundation support for the building structure, and promotes the building industry to develop towards higher quality and higher benefit. In the construction of a low-temperature laboratory, the prestressed concrete pipe pile can better adapt to complex geological conditions and special use requirements, can meet the bearing requirements of low-temperature laboratories of different scales and types, can shorten the construction period to a certain extent, reduce the cost and play an important role in the smooth promotion and sustainable development of the construction engineering of the low-temperature laboratory. In the conventional construction of prestressed concrete pipe piles, a series of conventional means are generally adopted to solve the related construction problems. In terms of the construction flow, a set of system standard operation system is lacking, the operation requirements of each construction link are not unified standard, and construction staff often conduct construction by experience. The definition of key construction parameters, such as pile sinking sequence, hammering number, pile splicing process and the like, is not clear and definite, and has no accurate data guidance, so that the randomness in the construction process is high. In the aspect of pile body parameter selection, the pile body parameter selection can not be tightly combined with the practical construction requirement, and a standardized construction guidance scheme is difficult to form. In addition, in the construction process, there are no perfect prevention and control measures for the problems of soil compaction effect, pile body deviation and the like. In addition, most of the existing related construction specifications are only general guidelines, no special construction description is given for specific bearing layers (such as fully weathered granite and strongly weathered granite), and the specifications are not organically integrated, so that construction staff are difficult and heavy to execute in actual operation. In low-temperature laboratory construction, the influence of low-temperature environment on construction, such as the influence of low temperature on concrete setting time, pile body material performance and the like, is not fully considered by the conventional means. However, these prior art conventional approaches suffer from significant drawbacks. Because the construction flow lacks the system specification, key construction parameter definition is fuzzy, pile body parameter and construction requirement are disjointed, and construction quality is uneven. In the construction of a low-temperature laboratory, the unstable quality can cause problems of the foundation in a low-temperature environment, and the normal use of the laboratory is affected. Meanwhile, the safety and durability of pile foundation engineering are seriously affected by the imperfection of prevention and control measures for soil compaction effect, pile body deflection and other problems. In addition, the lack of special construction description aiming at a specific bearing layer and the lack of integration of construction specifications increase the difficulty of operation execution in the construction process, and further influence the construction efficiency and quality. In low temperature laboratory construction, these problems can lead to extended construction periods, increased costs, and may not even meet the specific requirements of the low temperature laboratory for foundation stability and durability. Disclosure of Invention The application aims to overcome the technical problems and provides a construction process and a foundation structure for constructing a prestressed concrete pipe pile in