Method for bored pile construction in high-latitude and extremely-cold permafrost region

A bored pile and alpine technology, applied in sheet pile wall, foundation structure engineering, construction, etc., can solve the problem of few pile foundation construction schemes, no irrigation drilling method, permafrost hole collapse and pile foundation damage. and other problems, to achieve the effect of convenient transportation, entry and transfer, improved drilling efficiency, and simple equipment structure.

Inactive Publication Date: 2016-11-09
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP OF THE FIFTH ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there are not many existing pile foundation construction schemes for railways, highways and other structures in high-latitude alpine regions, and they cannot well solve the problem that the permafrost layer is prone to col...

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  • Method for bored pile construction in high-latitude and extremely-cold permafrost region

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Effect test

Embodiment

[0052] This embodiment discloses a construction method of bored piles in high-position, high-cold permafrost regions, such as figure 1 As shown, it is mainly to overcome the problem of frost heave damage to the pile foundation caused by moisture migration in the permafrost in high-latitude alpine regions, not only to prevent hole collapse and pile foundation damage due to uneven stress through various construction schemes In the case of percussion drilling, various plans are used to drill for different geological layers to ensure the construction efficiency and make the hole wall strong and stable. The specific implementation of the construction method is as follows:

[0053] 1. Construction preparation:

[0054] First of all, construction preparations must be carried out before construction, leveling the site in the construction area, removing debris, and compacting the drilling rig position. Unified arrangements shall be made for processing sites and construction access ro...

Embodiment 2

[0093] This embodiment is further defined on the basis of the above-mentioned embodiments. If construction is carried out in winter, some improvements should be made to the construction plan.

[0094] As temperatures cool, the seasonally frozen ground above the permafrost begins to freeze down to the surface. At this time, a section of 1.5m casing is buried to ensure that the mud overflow is higher than the construction water level, and then the percussion drilling construction can be started. During the construction, hollow slag drill bit is used to drill with a medium stroke of 75cm, and mud with a relative density of 1.25~1.5 is used to protect the wall to ensure the continuity of construction and prevent the phenomenon of drill sticking caused by freezing of water and mud. During the construction process, the specific gravity of the mud can be adjusted appropriately. At this time, the mud in the hole not only plays the role of wall protection, but also plays the role of h...

Embodiment 3

[0097] The present embodiment is further defined on the basis of the foregoing embodiments. The present embodiment is to apply the construction method of the present invention to a relatively large bridge construction project. The whole project builds 4 extra-large bridges and two large bridges. There are 640 pile foundations with a length of 10,053 meters, all of which are constructed by percussion drilling. From the start of work in August 2009 to the completion of pile foundation construction in August 2010, all of them are class I and class II piles after small strain tests, and class I piles 590, reaching 92%, the quality of piles is excellent. Other parts of this embodiment are the same as those of the foregoing embodiment, and will not be repeated here.

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Abstract

The invention discloses a method for bored pile construction in a high-latitude and extremely-cold permafrost region. The method comprises steps as follows: (1) firstly, a field is leveled before construction, sundries in an operation area are cleaned, and the field is arranged; (2) guard barrels are buried, and sufficient wall protection mud or wall protection clay is prepared; (3) a measurement baseline and a base point are re-checked, and demarcated pile positions and the elevation are measured; (4) a drilling jig takes the position and is fixed; (5) a percussion drill is used for drilling and formation of holes, and the mud or the clay is poured into the holes for wall protection; (6) the depth of the percussion drill entering rock is controlled, and final hole identification is performed on the drilled holes; (7) the holes are cleaned, dregs are taken out, and the final hole diameter and depth are measured; (8) reinforcement cages are manufactured and mounted in final holes; (9) ducts for secondary hole cleaning are mounted in the final holes; (10) concrete is poured, and pile foundation inspection is performed. With the method, drilled hole walls are firm and stable; and equipment is simple in structure and is not limited by the field, the drilling efficiency can be significantly improved, and the construction cost can be saved.

Description

technical field [0001] The invention relates to the field of bored pile construction, in particular to a construction method for bored piles in high-latitude, high-cold permafrost regions. Background technique [0002] The cast-in-situ pile system refers to the pile holes formed in the foundation soil by means of mechanical drilling, steel pipe extrusion or manual excavation on the project site, and piles made by placing steel cages and pouring concrete in them, depending on the method of hole formation. , Cast-in-situ piles can be divided into several categories such as immersed tube piles, bored piles and hole-dug piles. Bored pile is a pile type defined according to the classification of pile forming methods. Frozen soil refers to various rocks and soils below zero degrees Celsius and contains ice. It is extremely sensitive to temperature and contains abundant underground ice. Therefore, permafrost has rheological properties, and its long-term strength is much lower tha...

Claims

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Application Information

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IPC IPC(8): E02D5/38E02D27/35E02D27/12
CPCE02D5/38E02D27/12E02D27/35
Inventor 苏春生梁朋刚何十美汤振亚
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP OF THE FIFTH ENG
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