CN107423525B - Method for calculating length of bored pile by circularly drilling bored pile and replacing rock judgment - Google Patents

Method for calculating length of bored pile by circularly drilling bored pile and replacing rock judgment Download PDF

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CN107423525B
CN107423525B CN201710711321.6A CN201710711321A CN107423525B CN 107423525 B CN107423525 B CN 107423525B CN 201710711321 A CN201710711321 A CN 201710711321A CN 107423525 B CN107423525 B CN 107423525B
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pile
calculating
hole forming
exploration
depth
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CN107423525A (en
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纪贵强
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Xindi Energy Engineering Technology Co Ltd
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Xindi Energy Engineering Technology Co Ltd
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Abstract

The invention relates to a method for calculating the length of a bored pile by circularly drilling a bored pile to replace rock judgment, which comprises the following steps of: (A) converting the geological survey point and the designed pile position into a coordinate system, and inserting the geological survey point into the pile position according to the coordinates; (B) drawing a holding layer curve corresponding to the geological survey point in a pile diagram, and further drawing a three-dimensional histogram if necessary; (C) and analyzing the geological survey curve, and calculating the pile length of the corresponding pile.

Description

Method for calculating length of bored pile by circularly drilling bored pile and replacing rock judgment
Technical Field
The invention relates to a method for calculating the length of a bored pile by circularly drilling a bored pile to replace rock judgment.
Background
In the complex address condition, the soil layer depth has fluctuation area: such as near-sea backfill areas. Rock judgment is often needed when a final hole is constructed in the concrete cast-in-place pile so as to confirm the depth of entering a bearing stratum. Due to the mechanical construction characteristics, if a circulating drilling machine is adopted for pore-forming, rock judgment cannot be carried out due to the fact that soil samples cannot be collected; if the rotary drilling machine is used for hole forming, rock judgment can be carried out, but the construction cost is greatly increased.
Disclosure of Invention
In order to solve the technical problems, the inventor carries out intensive research, and provides a method for calculating the length of a bored pile formed by circularly drilling a bored pile instead of judging rocks, aiming at calculating the depth of a bored hole by a series of analysis methods and simplifying the rock judging process during hole forming by circularly drilling.
The invention discloses a method for calculating the length of a bored pile by circularly drilling a bored pile to replace rock judgment, which comprises the following steps of:
(A) converting the geological survey point and the designed pile position into a coordinate system, and inserting the geological survey point into the pile position according to the coordinates;
(B) drawing a holding layer curve corresponding to the geological survey point in a pile diagram, and further drawing a three-dimensional histogram if necessary;
(C) and analyzing the geological survey curve, and calculating the pile length of the corresponding pile.
In the step (C), the pile hole forming depth is calculated by adopting an averaging method, and the method comprises the following steps:
(1) finding continuous (uninterrupted) soil layer stable exploration points and determining the range of piles which can be represented by the exploration points;
(2) calculating an average distance L ave from the absolute elevation 0 meter to the bearing stratum, wherein the average distance L ave from the absolute elevation 0 meter to the bearing stratum = (L exploration point 1+ L exploration point 2+ … … L exploration point n)/n;
(3) and (4) calculating the pile hole forming depth, namely the hole forming depth l (pile 1, pile 2 and pile 3.·) = l pile ground elevation (pile 1, pile 2 and pile 3.·) + L ave + l in the range is designed into the depth of the bearing stratum.
The depth of the designed bearing stratum can be determined by one of ordinary skill in the art according to engineering requirements, specific regional rock strata and other conditions.
The scheme is economical and applicable, and has no great influence on the construction cost.
Alternatively, the maximum method is adopted to calculate the pile hole forming depth, and the method comprises the following steps:
(1) finding continuous (uninterrupted) soil layer stable exploration points and determining the range of piles which can be represented by the exploration points;
(2) calculating a maximum distance L max from the absolute elevation 0 meters to the bearing stratum, wherein the maximum distance L max = max from the absolute elevation 0 meters to the bearing stratum (L exploration point 1, L exploration point 2, … … L exploration point n);
(3) and (4) calculating the pile hole forming depth, namely the hole forming depth l (pile 1, pile 2 and pile 3.·) = l pile ground elevation (pile 1, pile 2 and pile 3.·) + L max + l in the range and designing the depth of the bearing stratum.
Alternatively, the pile hole forming depth is calculated by using a proportional method:
(1) extending the pile axis to the curve of the top surface of the bearing layer;
(2) setting adjacent ground exploration points, an absolute elevation 0 meter line and a layer top surface curve as a trapezoid, and calculating the length l of the axis of the pile in the trapezoid according to a proportion, namely a shaft (1, 2,3.. once.);
(3) within the trapezoidal range, the pile hole forming depth of each axis is l hole forming depth (pile 1, pile 2 and pile 3.·) = l pile ground elevation (pile 1, pile 2 and pile 3.·) + l axis (1, 2,3.·..) + l and the depth of the bearing stratum are designed.
In the above method, before step (a), the method further comprises verifying accuracy of the survey report, wherein the early stage comprises performing a small amount of pile hole forming by using the rotary excavator, or performing a small amount of reconnaissance.
Drawings
Fig. 1 is a map of the coordinate system of the survey points, wherein circles 38, 39, 40, 41, 42 represent the survey points, and the small circles in the map represent the pile positions.
Fig. 2 is a plot of the bearing stratum corresponding to a survey point, wherein,
line 1 represents the distance from 0 m absolute elevation to the top surface of the bearing stratum (because the ground is uneven and the elevations are different, 0 m absolute elevation is uniformly adopted as a reference point).
Line 2 is the distance mark from the elevation 0 meter to the top surface of the bearing layer.
Line 4 is an absolute 0 meter line; line 3 is the top surface curve of the support layer.
Fig. 3 is a three-dimensional histogram of survey points.
FIG. 4 is a geological survey curve analysis diagram during the gentle geological and elevation changes of soil layers.
FIG. 5 is a map of the analysis of the earth's survey curve when there is a large transition in soil stabilization.
Detailed Description
The following describes the practice of the present invention in detail with reference to the accompanying drawings.
The invention discloses a method for calculating the length of a bored pile by circularly drilling a bored pile to replace rock judgment, which comprises the following steps of:
(A) converting the surveying points and the designed pile positions into a coordinate system, inserting the surveying points into the pile positions according to coordinates, and marking the surveying points and the pile positions in the coordinate system as shown in figure 1;
(B) drawing a supporting layer curve corresponding to the geological survey point in a pile diagram, and further drawing a three-dimensional histogram if necessary, as shown in fig. 2 and fig. 3, wherein a line 1 represents the distance from an absolute elevation of 0 m to the top surface of the supporting layer (the absolute elevation of 0 m is uniformly adopted as a reference point due to uneven ground and different elevations), and a line 2 represents the distance from the elevation of 0 m to the top surface of the supporting layer; line 4 is an absolute 0 meter line; line 3 is the top surface curve of the holding layer;
(C) and analyzing the geological survey curve, and calculating the pile length of the corresponding pile (fig. 4 and 5).
In the step (C), the pile hole forming depth is calculated by adopting an averaging method, and the method comprises the following steps:
(1) finding continuous (uninterrupted) soil layer stable exploration points and determining the range of piles which can be represented by the exploration points;
(2) calculating an average distance L ave from the absolute elevation 0 meter to the bearing stratum, wherein the average distance L ave from the absolute elevation 0 meter to the bearing stratum = (L exploration point 1+ L exploration point 2+ … … L exploration point n)/n;
(3) and (4) calculating the pile hole forming depth, namely the hole forming depth l (pile 1, pile 2 and pile 3.·) = l pile ground elevation (pile 1, pile 2 and pile 3.·) + L ave + l in the range is designed into the depth of the bearing stratum.
The scheme is economical and applicable, and has no great influence on the construction cost.
Alternatively, the maximum method is adopted to calculate the pile hole forming depth, and the method comprises the following steps:
(1) finding continuous (uninterrupted) soil layer stable exploration points and determining the range of piles which can be represented by the exploration points;
(2) calculating a maximum distance L max from the absolute elevation 0 meters to the bearing stratum, wherein the maximum distance L max = max from the absolute elevation 0 meters to the bearing stratum (L exploration point 1, L exploration point 2, … … L exploration point n);
(3) and (4) calculating the pile hole forming depth, namely the hole forming depth l (pile 1, pile 2 and pile 3.·) = l pile ground elevation (pile 1, pile 2 and pile 3.·) + L max + l in the range and designing the depth of the bearing stratum.
Alternatively, the pile hole forming depth is calculated by using a proportional method:
(1) extending the pile axis to the curve of the top surface of the bearing layer;
(2) setting adjacent ground exploration points, an absolute elevation 0 meter line and a layer top surface curve as a trapezoid, and calculating the length l of the axis of the pile in the trapezoid according to a proportion, namely a shaft (1, 2,3.. once.);
(3) within the trapezoidal range, the pile hole forming depth of each axis is l hole forming depth (pile 1, pile 2 and pile 3.·) = l pile ground elevation (pile 1, pile 2 and pile 3.·) + l axis (1, 2,3.·..) + l and the depth of the bearing stratum are designed.
In the above method, before step (a), the method further comprises verifying accuracy of the survey report, wherein the early stage comprises performing a small amount of pile hole forming by using the rotary excavator, or performing a small amount of reconnaissance.
According to the method disclosed by the invention, the rock judging process during hole drilling in a circulating manner is simplified.

Claims (2)

1. A method for calculating the length of a bored pile by circularly drilling a bored pile instead of judging rocks comprises the following steps:
(A) converting the geological survey point and the designed pile position into a coordinate system, and inserting the geological survey point into the pile position according to the coordinates;
(B) drawing a holding layer curve corresponding to the geological survey point in a pile diagram, and further drawing a three-dimensional histogram if necessary;
(C) analyzing the geological survey curve, and calculating the pile length of the corresponding pile;
in the step (C), the pile hole forming depth is calculated by adopting an averaging method, and the method comprises the following steps:
(1) finding out exploration points with stable continuous soil layers, and determining the range of piles which can be represented by the exploration points;
(2) calculating an average distance L ave from the absolute elevation 0 meter to the bearing stratum, wherein the average distance L ave from the absolute elevation 0 meter to the bearing stratum = (L exploration point 1+ L exploration point 2+ … … L exploration point n)/n;
(3) calculating the pile hole forming depth, wherein the hole forming depth of each pile in the range = the ground elevation of the pile + L ave + the designed depth of the bearing stratum;
or, calculating the pile hole forming depth by adopting a maximum value method, and comprising the following steps:
(1) finding out exploration points with stable continuous soil layers, and determining the range of piles which can be represented by the exploration points;
(2) calculating a maximum distance L max from the absolute elevation 0 meters to the bearing stratum, wherein the maximum distance L max = max from the absolute elevation 0 meters to the bearing stratum (L exploration point 1, L exploration point 2, … … L exploration point n);
(3) calculating the pile hole forming depth, wherein the hole forming depth of each pile in the range = the ground elevation of the pile + L max + the designed depth of the bearing stratum;
or, calculating the pile hole forming depth by using a proportional method:
(1) extending the pile axis to the curve of the top surface of the bearing layer;
(2) setting adjacent geological survey points, an absolute elevation 0 meter line and a layer top surface curve as a trapezoid, and calculating the length of the axis of the pile in the trapezoid in proportion;
(3) and (3) the pile hole forming depth per axis in the trapezoidal range = the pile ground elevation + the length of the pile axis in the trapezoid + the depth of the designed bearing stratum.
2. The method of claim 1, wherein prior to step (a), further comprising verifying the accuracy of the survey report, including a prior drilling of a small number of pile holes with the rotary cutter, or a small number of reconnaissance.
CN201710711321.6A 2017-08-18 2017-08-18 Method for calculating length of bored pile by circularly drilling bored pile and replacing rock judgment Active CN107423525B (en)

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CN108729478A (en) * 2018-07-18 2018-11-02 中铁十六局集团第三工程有限公司 A kind of simulation three-dimensional surface determines the long construction method of CFG stakes

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CN104895078A (en) * 2015-05-18 2015-09-09 王正军 Precast pile construction method focusing on end bearing force
CN105714769A (en) * 2016-03-17 2016-06-29 中国水利水电第十一工程局有限公司 Construction method for anti-sliding cast-in-place pile
CN106682364A (en) * 2017-01-22 2017-05-17 深圳泛华工程集团有限公司 Method and system for determining the depth of each pile driven into rock layer
CN106677232A (en) * 2016-12-30 2017-05-17 华中科技大学 Torsion shear wave shock excitation collection analysis method for foundation pile detection

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JP2010185259A (en) * 2009-02-13 2010-08-26 Ohbayashi Corp Construction method for in-situ cast pile, and excavation system
CN202247864U (en) * 2011-09-08 2012-05-30 上海建工集团股份有限公司 Bored pile

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CN104895078A (en) * 2015-05-18 2015-09-09 王正军 Precast pile construction method focusing on end bearing force
CN105714769A (en) * 2016-03-17 2016-06-29 中国水利水电第十一工程局有限公司 Construction method for anti-sliding cast-in-place pile
CN106677232A (en) * 2016-12-30 2017-05-17 华中科技大学 Torsion shear wave shock excitation collection analysis method for foundation pile detection
CN106682364A (en) * 2017-01-22 2017-05-17 深圳泛华工程集团有限公司 Method and system for determining the depth of each pile driven into rock layer

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