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Construction method for rock-entering cast-in-situ bored piles with diameter of less than 1.5m

A technology of bored piles and construction methods, which is applied in the direction of sheet pile walls, foundation structure engineering, foundation structure tests, etc. It can solve problems such as inability to salvage quality and equipment, drill bits are easy to get stuck in rock formations, and drilling efficiency is reduced. Achieve the effect of reducing project quality risk, shortening construction period, and fast hole forming speed

Inactive Publication Date: 2013-03-27
CHINA FIRST METALLURGICAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the ultra-deep rock bored piles with a diameter greater than 1.5 meters are constructed independently with rotary drilling rigs or percussion drilling rigs, and the drilling efficiency is low
Due to the constraints of geological conditions and the limitation of large-diameter drilling of large-scale rotary drilling rigs, if the rotary drilling rig is forced to drill in the case of ultra-deep rock, the drilling efficiency will be greatly reduced, and the drill bit is easily stuck in the rock formation and cannot be salvaged. Cause quality and equipment accidents
If the percussion drilling rig is used for independent construction, the efficiency of footage in the rock formation is extremely low, and it usually takes a lot of time and energy to complete the hole-forming construction of a pile, which is likely to cause hole collapse and quality accidents

Method used

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  • Construction method for rock-entering cast-in-situ bored piles with diameter of less than 1.5m
  • Construction method for rock-entering cast-in-situ bored piles with diameter of less than 1.5m
  • Construction method for rock-entering cast-in-situ bored piles with diameter of less than 1.5m

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: The design value of the borehole diameter is 1.8 meters.

[0026] A construction method for rock-in-place bored piles with a diameter > 1.5 meters, the steps of which are as follows:

[0027] 1) Do a good job of preparation before construction, and carry out measurement and setting-out and lower casing 1, the diameter of casing 1 is 200 mm larger than the set drilling diameter;

[0028] 2) Once the casing is in place, use a rotary excavator with a drill bit diameter 18-20 mm smaller than the set hole diameter to drill to the hole bottom elevation. For replacement, the device for separating mud by piling is mainly composed of pile driver 1, mud pool 2, mud delivery pipe 3, mud pump one 4, mud pump two 5, mud discharge pipe 6, mud sedimentation tank 7, in mud The upper end of the sedimentation tank 7 is installed with a conical sand-stone separator 8 through a bracket 11, and the mud inlet pipe 9 connected and connected between the conical sand-stone separa...

Embodiment 2

[0039] Embodiment two: the borehole diameter design value is 2.2 meters:

[0040] A construction method for rock-in-place bored piles with a diameter > 1.5 meters, the steps of which are as follows:

[0041] 1) Do a good job of preparation before construction, and carry out measurement and setting-out and lower casing 1, the diameter of casing 1 is 250 mm larger than the set drilling diameter;

[0042] 2) Once the casing is in place, use a rotary excavator with a drill bit diameter smaller than the set drilling diameter of 22mm to drill the hole to the bottom elevation. Carry out replacement and control the mud index in the borehole as follows: general strata: relative density is 1.12-1.15, viscosity is 18-20); easily collapsed stratum: relative density is 1.28-1.40, viscosity is 21-27s; rock formation: relatively The density is 1.12-1.14, the viscosity is 25-30s; the sand content rate is 3.0%, and the colloidal rate is 96.5%;

[0043] 3) Use the aforementioned pile hole hol...

Embodiment 3

[0053] Embodiment three: the set value of the borehole diameter is 2.5 meters:

[0054] A construction method for rock-in-place bored piles with a diameter > 1.5 meters, the steps of which are as follows:

[0055] 1) Do a good job of preparation before construction, and carry out measurement and setting-out and lower casing 1, the diameter of casing 1 is 300 mm larger than the set drilling diameter;

[0056] 2) Once the casing is in place, use a rotary excavator with a drill bit diameter smaller than the set drilling diameter of 30mm to drill the hole to the bottom elevation. Replacement; general strata: relative density is 1.15-1.20, viscosity is 20-22s; easily collapsed stratum: relative density is 1.30-1.45, viscosity is 22-28s; rock formation: relative density is 1.12-1.15, viscosity is 28-35s ;Sand content rate is 6%, colloid rate is 97.5%;

[0057] 3) Use the aforementioned pile hole hole type detection device to detect the verticality and aperture of the borehole. Aft...

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Abstract

The invention relates to a construction method for rock-entering cast-in-situ bored piles with a diameter of less than 1.5m. The method comprises the following steps: making all preparations, carrying out line laying for measurement, and burying a steel casing 1; drilling holes by using a rotary digging machine until the drilled hole reaches the bottom elevation of the hole; detecting the verticality and hole diameter of the drilled hole and taking out the steel casing 1; re-checking the positions of piles and burying a steel casing 2; drilling holes by using a percussion drill, and carrying out detection on the verticality and hole diameter of the drilled hole; carrying out routine detection on finally-drilled holes; carrying out first hole cleaning on the drilled holes; burying a reinforcing cage in the drilled hole; installing a duct; carrying out second hole cleaning on the drilled holes; pouring concrete into the drilled holes until the construction process is completed; and carrying out routine detection on the bored concrete piles. In the method provided by the invention, through setting a rational drill diameter, the hole-forming speed can effectively improved, the construction period can be greatly shortened, and the engineering quality risks can be lowered; meanwhile, the occupied road construction time can be reduced, a large amount of cost can be saved, the noise can be lowered, and the emission of mud can be reduced, thereby meeting the requirements for environmental protection and energy conservation of urban engineering construction.

Description

technical field [0001] The invention relates to a construction method of cast-in-situ piles, in particular to a construction method of rock-in-place bored piles with a diameter greater than 1.5 meters. Background technique [0002] With the development of cities, viaducts are widely used to solve the problem of urban traffic pressure. At present, the span of bridges continues to increase, and the application of large-diameter ultra-deep rock bored piles has also increased dramatically. Most urban viaducts are constructed in the middle of urban roads, so the construction period is very tight. Among them, the construction of bored piles occupies a large amount of construction period, especially the large-diameter ultra-deep rock bored piles, which often become the bottleneck restricting the progress of the entire project. , The large-diameter ultra-deep rock bored pile construction in fields such as super high-rise buildings also encounters the same problem. At present, the u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/34E02D33/00E02D15/04
Inventor 黎明中王亮焦勇田国清吴宗庆王春兰
Owner CHINA FIRST METALLURGICAL GROUP
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