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Construction method of pole and tower foundation micro pile in soft soil foundation

A technology of pole and tower foundation and construction method, applied in the direction of foundation structure engineering, foundation structure test, sheet pile wall, etc., can solve the problems of unsatisfactory bearing capacity, unsatisfactory effect, unsafe hidden danger, etc. , Good technical support, convenient construction effect

Pending Publication Date: 2022-02-11
STATE GRID LIAONING ECONOMIC TECHN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although this kind of tree root pile is small in size and flexible in construction, its effect is not ideal when used in soft soil foundation tower foundations, and its bearing capacity cannot meet the requirements of existing construction techniques, and there are certain unsafe hidden dangers

Method used

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  • Construction method of pole and tower foundation micro pile in soft soil foundation
  • Construction method of pole and tower foundation micro pile in soft soil foundation
  • Construction method of pole and tower foundation micro pile in soft soil foundation

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Experimental program
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Effect test

Embodiment 1

[0063] The present invention provides an embodiment, which is a construction method of micro-piles for pole and tower foundations in soft soil foundations. The micro-piles described in the present invention, namely MP piles, are developed on the basis of existing tree root piles. A new type of pile foundation. The difference between MP piles and traditional tree root piles is that the secondary grouting process is used. Therefore, the MP pile is a pile body with variable cross-section. Through the secondary grouting process, the bearing capacity of the single pile in the soft soil foundation can be greatly improved.

[0064] A kind of construction method of pole tower foundation miniature pile in the soft soil foundation of the present invention, specifically comprises the following steps:

[0065] Step 1. Bind the reinforcement cage 3 and the secondary grouting pipe 2.

[0066] During construction, first bind the 1-inch secondary grouting pipe 2 on the reinforcement cage 3 ...

Embodiment 2

[0167] The present invention provides another embodiment, which is a construction method of miniature piles in a soft soil foundation, such as the construction method described in embodiment 1. When constructing, all the test piles are 15m long and the pile diameter is 250mm. Except for D-7 and D-8 test piles, φ219×4mm steel pipes are used instead of steel cages within 3m of the pile tops of other test piles, and the reinforcement of the pile body is 8φ14 in the 3-10m part, and the reinforcement in 10-15m is halved; The stirrup adopts spiral stirrup φ6@200, and a φ12 welded stiffening stirrup is installed every 2m, and the pile top stirrup is strengthened. Figure 4-2 . The cement uses No. 425 ordinary Portland cement, and the crushed stone aggregate 6 uses washed crushed stone with a particle size of 15-25mm. The water-cement ratio of primary grouting is 0.5, and the water-cement ratio of secondary grouting is 0.5. The size of the single pile cap is 0.6×0.6×0.5 (height) m, ...

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Abstract

The invention belongs to the technical field of electric power infrastructure construction and particularly relates to a construction method of a tower foundation micro pile in a soft soil foundation. The construction method comprises the following steps that 1, a reinforcement cage and a secondary grouting pipe being bound; 2, positioning a pile position, forming a hole and cleaning the hole; 3, a reinforcement cage being arranged in the hole, a primary grouting pipe being arranged, and gravel aggregate being put into the primary grouting pipe; 4, grouting being conducted in the primary grouting pipe, and a pile being formed preliminarily; 5, after the grout is initially set, secondary grouting being conducted in the primary grouting pipe; and 6, forming a pile after the slurry is coagulated. The method is advantaged in that the method has advantages of being safe and convenient to construct, the construction period can be greatly shortened, the occupied area is small, construction cost is reduced, and funds are saved. Due to the fact that the MP pile is a variable cross-section pile body, the bearing capacity of a single pile is greatly improved through the secondary grouting technology, the bearing capacity after grouting is improved by 20-30% compared with the bearing capacity before grouting, and the service life of the electric power infrastructure is effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of electric power infrastructure construction, and in particular relates to a construction method of micro piles for pole and tower foundations in soft soil foundations. Background technique [0002] With the rapid development of my country's national economy, the country's investment in power infrastructure is increasing day by day. my country has a vast land and abundant resources, and many local geomorphological units are lacustrine plain accumulation landforms. The terrain of the site is low, and the ground is uneven. The rainy season coincides with the construction of the test piles, and the low-lying areas have more and deeper water. In such areas, the engineering geological characteristics of each soil layer usually include: pond mud, muddy clay and silt from top to bottom. In this environment, it becomes very difficult to set up the foundation of the tower. [0003] At present, the main type of tow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/12E02D27/42E02D27/34E02D5/34E02D15/04E02D33/00
CPCE02D27/12E02D27/42E02D27/34E02D5/34E02D15/04E02D33/00
Inventor 陈友慧吕忠华李冬雪刘然潘琪吴昊马强张吉贾及汉陈国龙贾博吕铭吴卓航金子开卢天琪王勇刘岩王淼赫鑫金宇飞毕月胡瑞雪张明理于长永杨继业高靖杨博杨国琛
Owner STATE GRID LIAONING ECONOMIC TECHN INST