CN110552379A - method for measuring slurry index of cast-in-situ bored pile - Google Patents
method for measuring slurry index of cast-in-situ bored pile Download PDFInfo
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- CN110552379A CN110552379A CN201810543760.5A CN201810543760A CN110552379A CN 110552379 A CN110552379 A CN 110552379A CN 201810543760 A CN201810543760 A CN 201810543760A CN 110552379 A CN110552379 A CN 110552379A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
the invention belongs to the technical field of slurry detection, and particularly relates to a method for measuring slurry indexes of a cast-in-situ bored pile. The detection method of each index comprises the following steps: a. and (3) relative density of grouting slurry: measuring by using a mud relative densitometer; b. and (3) viscosity of grouting slurry: injecting 700ml of mud into a hollow inverted cone container, calculating the time of the 700ml of mud freely passing through the inverted cone container, and obtaining the viscosity of the measured mud through time comparison; c. sand content (%) of the grouting slurry: filling the slurry into a measuring tube with a filter screen in the middle, adding double volume of clear water, and then shaking; then the measuring tube is rotated by 180 degrees to turn upside down; and observing the scales of the lower-end precipitated sand, and reading the percentage content of the sand. The method is innovated and reformed on the basis of the traditional detection means, greatly improves the convenience of the on-site detection means, and avoids the problem of complex operation of the traditional detection method.
Description
Technical Field
The invention belongs to the technical field of slurry detection, and particularly relates to a method for measuring slurry indexes of a cast-in-situ bored pile.
background
The cast-in-place pile system is a pile formed by forming a pile hole in foundation soil through mechanical drilling, steel pipe soil extrusion or manual excavation and the like on an engineering site, placing a reinforcement cage and cast-in-place concrete in the pile hole, and the cast-in-place pile can be divided into a immersed tube cast-in-place pile, a cast-in-place pile and a cast-in-place pile according to different hole forming methods.
At present, the pile hole slurry of many road and bridge engineering is treated by adopting a chemical and mechanical combination mode. Firstly, a 2-layer high-frequency vibration dewatering screen is used for cleaning larger particles (> 3 mm) in the slurry mechanically, the residual slurry is pumped into a hydrocyclone by a slurry pump or a sand pump for solid-liquid separation, the slurry with finer particles enters a sedimentation tank through an overflow port at the upper part of the hydrocyclone, and is added with a flocculating agent for sedimentation, and then the slurry continues to enter circulation. Slurry with coarse particles enters a high-frequency vibration dewatering screen through a slurry outlet at the lower part of the hydrocyclone for dewatering, and the water content of solid discharged from a discharge port is less than 18 percent, thereby meeting the requirements of stacking and transportation.
The performance index of the pile hole slurry directly influences the quality of the cast-in-place pile, so that the detection of the cast-in-place pile slurry is particularly important.
Disclosure of Invention
The invention aims to provide the method for measuring the slurry index of the cast-in-situ bored pile, which has the advantages of simple structure, reasonable design and convenient use, is innovated and reformed on the basis of the traditional detection means, greatly improves the convenience of the on-site detection means and avoids the problem of complex operation of the traditional detection method.
In order to achieve the purpose, the invention adopts the technical scheme that: the detection method of each index comprises the following steps:
a. and (3) relative density of grouting slurry: can be measured by a mud relative densitometer. Filling the mud cup with mud to be measured, covering and cleaning the mud overflowing from the small hole, then placing the mud on the bracket, moving the floating weight to enable the lever to be in a horizontal state (namely, the air bubble is in the center), and reading out the scale shown on the left side of the floating weight, namely the relative density of the mud;
b. And (3) viscosity of grouting slurry: respectively measuring 200ml and 500ml of slurry by two cups with openings at two ends, filtering large sand grains by a large filter screen, uniformly injecting 700ml of slurry into a hollow inverted cone container, arranging a dense viscosity filter screen at the bottom of the inverted cone container, wherein the aperture of the viscosity filter screen is 4-6mm, calculating the time that 700ml of slurry freely passes through the inverted cone container, and obtaining the viscosity of the measured slurry by comparing the time;
c. sand content (%) of the grouting slurry: filling the slurry into a measuring tube with a filter screen in the middle, calculating the volume according to a scribed line on the measuring tube, adding clear water with double volume according to the volume of the slurry, blocking a tube opening and carrying out shaking treatment; then the measuring tube is rotated by 180 degrees to turn upside down; and (3) separating large particles at the upper end of the filter screen, allowing fine sand in the slurry to pass through the filter screen and precipitate downwards, observing the scale of the precipitated sand at the lower end after the water in the pipe to be detected is recovered to be clear, and reading the percentage content of the sand.
Preferably, a fine sand filter screen is arranged in the middle of the measuring pipe of the mud sand content, and the maximum mud injection amount of the measuring pipe does not exceed one fourth of the length of the whole pipe.
preferably, the upper caliber of the hollow inverted cone-shaped container for slurry viscosity is three to four times of the lower caliber.
after adopting the structure, the invention has the beneficial effects that: the method for measuring the slurry index of the cast-in-situ bored pile is innovated and reformed on the basis of the traditional detection means, greatly improves the convenience of the on-site detection means, and avoids the problem of complex operation of the traditional detection method. The invention has the advantages of simple structure, reasonable arrangement, low manufacturing cost and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the construction of the present invention for a cementing mud viscosity device.
FIG. 2 is a schematic structural view of the apparatus for determining sand content in grouting mud of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
referring to fig. 1 and fig. 2, the following technical solutions are adopted in the present embodiment: the detection method of each index comprises the following steps:
a. And (3) relative density of grouting slurry: can be measured by a mud relative densitometer. Filling the mud cup with mud to be measured, covering and cleaning the mud overflowing from the small hole, then placing the mud on the bracket, moving the floating weight to enable the lever to be in a horizontal state (namely, the air bubble is in the center), and reading out the scale shown on the left side of the floating weight, namely the relative density of the mud;
b. And (3) viscosity of grouting slurry: respectively measuring 200ml and 500ml of slurry by two cups with openings at two ends, filtering large sand grains by a large filter screen, uniformly injecting 700ml of slurry into a hollow inverted cone container, arranging a dense viscosity filter screen at the bottom of the inverted cone container, wherein the aperture of the viscosity filter screen is 4-6mm, calculating the time that 700ml of slurry freely passes through the inverted cone container, and obtaining the viscosity of the measured slurry by comparing the time;
c. sand content (%) of the grouting slurry: filling the slurry into a measuring tube with a filter screen in the middle, calculating the volume according to a scribed line on the measuring tube, adding clear water with double volume according to the volume of the slurry, blocking a tube opening and carrying out shaking treatment; then the measuring tube is rotated by 180 degrees to turn upside down; and (3) separating large particles at the upper end of the filter screen, allowing fine sand in the slurry to pass through the filter screen and precipitate downwards, observing the scale of the precipitated sand at the lower end after the water in the pipe to be detected is recovered to be clear, and reading the percentage content of the sand.
wherein, a fine sand filter screen is arranged in the middle of the measuring tube of the mud sand content, and the maximum injection amount of the mud of the measuring tube is not more than one fourth of the length of the whole tube; the upper caliber of the hollow inverted cone-shaped container for slurry viscosity is three to four times of the lower caliber.
In addition, the performance requirements of the slurry feedstock are:
the performance requirements of clay soil are as follows:
A. Clay soil with plasticity index of more than 25 and particle size of less than 0.074mm and clay content of more than 50% can be selected for pulping. When the clay soil with the performance is lacked, clay soil with slightly poor performance can be used, and 30% of clay soil with the plasticity index of more than 25 is doped;
when the performance index of the slurry prepared by clay with poor performance does not meet the requirement, Na 2 CO 3 (commonly called alkali powder or soda ash), sodium hydroxide (NaOH) or bentonite powder can be added into the slurry to improve the performance index of the slurry, the adding amount is related to the performance of the original slurry and is determined by tests, the adding amount of the sodium carbonate is about 0.1-0.4 percent of the amount of the slurry in a hole;
B. The performance and the dosage of the bentonite are as follows:
The bentonite slurry has the advantages of low relative density, low viscosity, low sand content, low water loss, thin mud skin, strong stability, strong wall-fixing capacity, small rotation resistance of a drilling tool, high drilling rate, large slurry making capacity and the like. Typically 8% of the water is used, i.e. 8kg of bentonite can be mixed with 100L of water. The dosage of the clay soil bottom layer can be reduced to 3-5%. The poorer consumption of the bentonite is about 12 percent of the water;
C. Additive and mixing amount thereof:
The CMC full-name carboxymethyl cellulose can increase the viscosity of slurry, form a film on the surface of a soil layer to prevent the wall of a hole from peeling off and has the effect of reducing water loss. The doping amount is 0.05-0.01% of the bentonite;
2 3The slurry is used for increasing the pH value to 10, when the pH value in the slurry is too small, clay particles are difficult to decompose, the viscosity is reduced, the water loss is increased, the fluidity is reduced, when the pH value is less than 7, a drilling tool is corroded, if the pH value is too large, the slurry penetrates into the clay on the hole wall, the surface of the hole wall is softened, the cohesion between the clays is weakened, and the hole wall is collapsed due to cracking, and when the pH value is 8-10, the thickness of a hydration film can be increased, the alternation rate and the stability of the slurry are improved, and the water loss is reduced, wherein the doping amount is 0.3-0.5 percent of that of the bentonite;
And thirdly, preparing a small amount of solvent from the raw materials and various additives, uniformly adding the solvent according to a cycle period, measuring the performance index of the slurry in time and preventing the excessive addition of the additives. The relative density difference per cycle should not exceed 0.01.
the above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (3)
1. The method for measuring the slurry index of the cast-in-situ bored pile is characterized by comprising the following steps: the detection method of each index comprises the following steps:
(a) and the relative density of the grouting mud: measuring by using a mud relative densimeter, filling the mud cup with the mud to be measured, covering and cleaning the mud overflowing from the small hole, then placing the mud on the bracket, moving the floating weight to enable the lever to be in a horizontal state, and reading out the scale shown on the left side of the floating weight, namely the relative density of the mud;
(b) And the viscosity of the grouting mud: respectively measuring 200ml and 500ml of slurry by two cups with openings at two ends, filtering large sand grains by a large filter screen, uniformly injecting 700ml of slurry into a hollow inverted cone container, arranging a dense viscosity filter screen at the bottom of the inverted cone container, wherein the aperture of the viscosity filter screen is 4-6mm, calculating the time that 700ml of slurry freely passes through the inverted cone container, and obtaining the viscosity of the measured slurry by comparing the time;
c. sand content (%) of the grouting slurry: filling the slurry into a measuring tube with a filter screen in the middle, calculating the volume according to a scribed line on the measuring tube, adding clear water with double volume according to the volume of the slurry, blocking a tube opening and carrying out shaking treatment; then the measuring tube is rotated by 180 degrees to turn upside down; and (3) separating large particles at the upper end of the filter screen, allowing fine sand in the slurry to pass through the filter screen and precipitate downwards, observing the scale of the precipitated sand at the lower end after the water in the pipe to be detected is recovered to be clear, and reading the percentage content of the sand.
2. The cast-in-situ bored pile mud index measurement method according to claim 1, wherein: the middle of the measuring pipe of the mud sand content is provided with a fine sand filter screen, and the maximum injection amount of the mud of the measuring pipe is not more than one fourth of the length of the whole pipe.
3. The cast-in-situ bored pile mud index measurement method according to claim 1, wherein: the upper caliber of the hollow inverted cone-shaped container for slurry viscosity is three to four times of the lower caliber.
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Citations (7)
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| CN201496013U (en) * | 2009-09-27 | 2010-06-02 | 中交第二公路工程局有限公司 | Pile foundation hole cleaning device |
| CN102226340A (en) * | 2011-04-15 | 2011-10-26 | 中国一冶集团有限公司 | Construction method for rock-entering cast-in-situ bored piles with diameter of less than 1.5m |
| CN105043929A (en) * | 2015-08-13 | 2015-11-11 | 中交四航工程研究院有限公司 | Specific gravity bottle for hole-bottom mud of cast-in-situ bored pile and rapid measuring method for specific gravity of hole-bottom mud of cast-in-situ bored pile |
| CN105547925A (en) * | 2016-01-26 | 2016-05-04 | 山东大学 | Mud denseness detector and detection method |
| CN106118620A (en) * | 2016-06-23 | 2016-11-16 | 中国路桥工程有限责任公司 | A kind of cast-in-situ bored pile mud and preparation method thereof |
| CN107761717A (en) * | 2016-08-15 | 2018-03-06 | 中国二十冶集团有限公司 | The construction method of sand content in mud is controlled in filling pile construction |
| CN108034414A (en) * | 2017-12-12 | 2018-05-15 | 中交公局第二工程有限公司 | A kind of boring mud |
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2018
- 2018-05-31 CN CN201810543760.5A patent/CN110552379A/en active Pending
Patent Citations (7)
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|---|---|---|---|---|
| CN201496013U (en) * | 2009-09-27 | 2010-06-02 | 中交第二公路工程局有限公司 | Pile foundation hole cleaning device |
| CN102226340A (en) * | 2011-04-15 | 2011-10-26 | 中国一冶集团有限公司 | Construction method for rock-entering cast-in-situ bored piles with diameter of less than 1.5m |
| CN105043929A (en) * | 2015-08-13 | 2015-11-11 | 中交四航工程研究院有限公司 | Specific gravity bottle for hole-bottom mud of cast-in-situ bored pile and rapid measuring method for specific gravity of hole-bottom mud of cast-in-situ bored pile |
| CN105547925A (en) * | 2016-01-26 | 2016-05-04 | 山东大学 | Mud denseness detector and detection method |
| CN106118620A (en) * | 2016-06-23 | 2016-11-16 | 中国路桥工程有限责任公司 | A kind of cast-in-situ bored pile mud and preparation method thereof |
| CN107761717A (en) * | 2016-08-15 | 2018-03-06 | 中国二十冶集团有限公司 | The construction method of sand content in mud is controlled in filling pile construction |
| CN108034414A (en) * | 2017-12-12 | 2018-05-15 | 中交公局第二工程有限公司 | A kind of boring mud |
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Application publication date: 20191210 |