Bored concrete pile construction method of permafrost layer

A construction method and technology of cast-in-situ piles, which are applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of thermal balance damage in holes, no perfect method, easy loose ground, etc., and achieve excellent quality, easy implementation, and convenient construction Effect

Active Publication Date: 2010-07-07
STATE GRID CORP OF CHINA
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Problems solved by technology

[0006] (1) The upper stratum of the hole is easy to be loose, easy to collapse holes, and even collapse in a large area;
[0007] (2) The heat generated during the excavation process melts the permafrost on the hole wall, destroys the thermal balance in the hole, easily causes the hole to slide, and causes serious hole expansion;
[0008] (3) Rapid hole formation and rapid pouring are required during construction, which brings great difficulties to construction
[0009] Currently there is no perfect method for concrete pouring pile operation in high altitude permafrost regions

Method used

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  • Bored concrete pile construction method of permafrost layer
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Embodiment Construction

[0034] The present invention is further illustrated with the following examples.

[0035] The power transmission line project from Xinjiang Imperial Palace 220 kV Substation to Jilintai Hydropower Station (referred to as Huangji Line) is a supporting output project for the first phase of Jilintai Hydropower Station. The whole line is about 96 kilometers long, and it is the first 220 kV high-voltage power transmission line across the high-altitude area of ​​the North Tianshan Mountains in Xinjiang. The path crosses the North Tianshan Mountains roughly along the north-south direction, takes the ridge of the Keguqin Mountain in the North Tianshan Mountains as the watershed, and crosses the Jinghe River and the Kashi River. Kekekurda plate is 3,500 meters above sea level, and there is snow all year round near the ridge, and there are small modern glaciers and ice-eroded landforms. The topography of the whole line has large undulations, being high in the middle and low at both end...

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Abstract

The invention provides a bored concrete pile construction method of a permafrost layer, which relates to the construction field of power transmission tower footings, with the development of power transmission engineering, power transmission lines extend to high altitude permafrost regions, but construction methods suitable for permafrost region tower footings are far from perfection, and bring large difficulty to the construction, therefore, the invention provides the following scheme: pile holes are rapidly excavated by means of heat balance in the state of nature, anti-caving hole retaining walls are poured thereto, cages of reinforcement are arranged in the pile holes and surfaces of the retaining walls in parallel, and concrete bored concrete piles are poured in layers rapidly, and the invention has benefits of simple method, convenient construction, easy implementation, stable permafrost layer and high efficiency of construction.

Description

technical field [0001] The invention relates to the field of transmission line construction, in particular to the construction of transmission tower foundations. Background technique [0002] With the development of power transmission projects, power transmission lines are gradually extending to high-altitude permafrost regions. [0003] Permafrost generally refers to permafrost (rock) that has been frozen for 2 years or more, and its surface is covered by rare vegetation. The natural upper limit is basically sandy slate, phyllite, mudstone schist and saline soil Due to the perennial frost heaving and weathering, the stratum becomes very broken and loose, but it is also a very good heat insulation layer. Once the natural upper limit of the permafrost is destroyed, the permafrost will easily cause damage. [0004] Common factors that are likely to cause permafrost damage include: (1) Excavation on the original ground; (2) Destruction of the original vegetation; (3) Rolling o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/36E02D27/35E02D27/42C04B28/00C04B14/06
Inventor 李照新王修江毕雪昱李亚
Owner STATE GRID CORP OF CHINA
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