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Pile core constructing method

A construction method and pile hole technology, which is applied in the direction of drilling equipment and methods, sheet pile walls, earthwork drilling and mining, etc., can solve the problems of low drilling efficiency, low drilling efficiency, poor applicability, etc., and reduce mud pollution , high drilling efficiency, good for generalization

Inactive Publication Date: 2008-12-10
程天森
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0144] 6. Composition and applicability of existing pile hole construction methods
[0146] The composition problem of existing pile hole construction method is: lack the multi-type pile hole construction method that the combination of drilling method belongs to 5-8 big types; Lack all types of pile hole construction method
[0147] (2) The applicability of the existing combination of drilling and platooning methods
[0149] (3) Applicability of existing pile hole construction methods
Therefore, there are many types of pile hole construction methods, and the generalization, serialization and standardization of drilling equipment are low.
In addition, due to the poor applicability of the combination of the pile hole and the ground, it is sometimes necessary to switch to the pile hole construction method when drilling the pile hole at the same hole position
[0151] Any existing pile hole construction method does not include all existing drilling and row method combinations applicable to strata. , the average drilling efficiency of the formation is low, sometimes accompanied by mud pollution, and even the pile hole construction method needs to be replaced
[0152] The drilling efficiency is low in soft rock and relatively soft rock formations where the existing drilling method combination is not suitable; in the gravel soil containing particles with a particle size > 400mm, which is relatively hard, the existing drilling method combination is not suitable Difficulty in forming pores in rock formations
[0153] (4) Applicability of commonly used pile hole construction methods in mainland my country
[0156] Under the current technical conditions, it is impossible for any combination of drilling and row methods to be suitable for all combinations of pile holes and formations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0180] Embodiment 1 Circular section pile hole drilling

[0181] Drilling of circular cross-section pile holes using percussion rotary grab bits

Embodiment 11

[0182] Embodiment 1.1 cohesive soil formation drilling

[0183] The combination of rotary grab drilling and drilling method is adopted. The drilling process is as follows: the grab flap turns downward and enters the formation along the circular surface of the hole wall, and then stops rotating the drill bit, drives the grab flap to close from the hole wall to the hole center to excavate the soil, and lifts the drill bit out. After the soil is unloaded, the drill bit is lowered for the next drilling, and the mud retaining wall is added to the hole after each drilling. The combination of this embodiment and the method of bucket drilling and row drilling is also applicable to the combination of round section pile holes and various cohesive soils. Due to the small area of ​​the rotary drilling surface, the requirements for the drilling equipment capacity and the hole forming cost in this example are lower than those of the combination of bucket drilling and row drilling methods. ...

Embodiment 12

[0184] Embodiment 1.2 Drilling in sandy soil formation

[0185] The combination of mud circulation rotary grab drilling and drilling method is used. The drilling process is as follows: the grab flap turns down and enters the formation along the circular surface of the hole wall, then stops rotating the drill bit, closes the grab flap to dig the soil, lifts the bit to a certain height, and then opens Grab the flap and lower the drill bit for the next drilling, and the sand scattered in the hole will exit the hole with the mud that circulates continuously inside and outside the hole. The combination of this embodiment and the mud circulation rotary drilling method is also applicable to the combination of circular cross-section pile holes and various sandy soil formations.

[0186] Example 1.3 Drilling into various gravel soil strata with particle size ≤ 400mm

[0187] Using the combination of mud circulation impact rotary grab drill or impact rotary grab drill and drilling meth...

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PUM

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Abstract

The present invention relates to a pile hole construction method. Said method includes the following 9 drilling and slag-discharging processes: slurry circulation clash rotary grab drilling; slurry circulation impact rotary grab drilling; slurry circulation rotary grab driling; slurry circulation hydraulic force horizontal static pressure grab drilling; slurry circulation hydraulic force active feeding submerged grab drilling; impact rotary grab drilling; rotary grab drilling; slurry circulation rotary grab drilling; hydraulic force horizontal static pressure grab drilling; slurry circulation hydraulic force horizontal static pressure drilling; hydraulic force active feeding submerged yrab drilling and slurry icrculation hydaulic force active feeding submerged grab drilling. said invented various drilling methods and slag-discharge methods and their combination can be used for various strata, and have the advantages of quick hole-forming speed, small drilling resistance and small slurry pollution.

Description

technical field [0001] The invention belongs to the technical field of drilling technology, and mainly relates to the drilling technology for pile hole construction. Background technique [0002] According to different conditions, piles can be divided into: vertical piles, horizontal piles, inclined piles; soil-squeezing piles, soil-stirring piles (such as powder-spraying piles, etc.), soil-discharging piles (such as non-squeezing soil bored piles, small amount of soil-squeezing bored piles, etc.); dry work piles, wet work piles; large width piles, medium width piles, thin piles; large diameter piles, medium diameter piles, small piles. The pile hole described in the present invention is a large diameter, large width, wet operation, soil discharge, vertical pile hole. [0003] As a specialized branch of drilling technology, pile hole construction drilling is in its initial stage of formation. Therefore, the technical background of the present invention will be described be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/00E02D5/00
Inventor 程天森
Owner 程天森
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