CN109000963A - A kind of plastic concrete cut-off wall sampling method - Google Patents
A kind of plastic concrete cut-off wall sampling method Download PDFInfo
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- CN109000963A CN109000963A CN201811004458.9A CN201811004458A CN109000963A CN 109000963 A CN109000963 A CN 109000963A CN 201811004458 A CN201811004458 A CN 201811004458A CN 109000963 A CN109000963 A CN 109000963A
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- wall
- plastic concrete
- concrete cut
- cut
- freezing pipe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a kind of plastic concrete cut-off wall sampling methods, freeze to plastic concrete cut-off wall sample position；Drill hole sampling when being chilled to setting condition.The present invention freezes plastic concrete cut-off wall by implementing, and can completely get plastic concrete cut-off wall core sample, can intuitively, reliably evaluate plastic concrete cut-off wall pouring quality.
Description
Technical field
The present invention relates to inspection of hydraulic structure field, in particular to a kind of plastic concrete cut-off wall sampling method.
Background technique
Plastic concrete refers to replace most of cement in normal concrete to be formed with clay and (or) bentonite one
Kind flexible material, cement consumption is far below normal concrete, and adds the cementitious materials such as more bentonite, clay,
It is suitble to the fluidity concrete of underwater casting, compression strength is not more than 5MPa, and has low bullet and the biggish spy of limiting strain
Property.Plastic concrete cut-off wall refers to a kind of cut-pff wall form using plastic concrete.The total amount of plastic concrete cementitious material
It is not preferably less than 240kg/m3, wherein cement consumption should not be less than 80kg/m3, bentonite consumption should not be less than 40kg/m3, cement with
Bentonitic total dosage should not be less than 160kg/m3, sand coarse aggregate ratio not be preferably less than 45%.Under the premise of meeting mobility requirement, preferably
Water consumption is reduced, and preferably uses a graded aggregate.
Due to the difference of ingredient, plastic concrete is more much smaller than the elasticity modulus of normal concrete or Clay-concrete, with
The deformation modulus of surrounding soil is close, thus can be well adapted for the deformation of ground, considerably reduces the intracorporal stress of wall, keeps away
Exempt from wall crazing, furthermore can also save cement material.Plastic concrete cut-off wall is mainly used in hydraulic and hydroelectric engineering
Construction cofferdam, dykes and dams reinforcement etc..In the recent decade, in the engineerings such as Changjiang dyke and numerous Strengthening Projects of Dangerous Reservoirs
In, the thin impervious wall construction technology of 200-400mm waits until to be widely applied.
It is the most for evaluation plastic concrete cut-off wall quality that core sample is taken at scene from plastic concrete cut-off wall body
Intuitively, reliably.By taking core sample that can extract sample, it is a series of that resistance to compression, tension, impervious, shearing resistance, bulk density etc. are done indoors
Test, can obtain the physical mechanical property index of plastic concrete cut-off wall, provide for evaluation plastic concrete cut-off wall quality
The foundation of science.Since plastic concrete cut-off wall wall is thin, generally 200-1200cm is thick, and depth is big, and tens meters even super
Hundred meters are crossed, elasticity modulus is small, and compression strength is low, and ingredient is hard soft alternate (containing aggregate, sand, cement, clay etc.), and boring and coring is difficult
Degree is big, and lithology is easily broken in boring procedure, and often drilled flushing liquor destroys adhesive, and core is substantially in granular media shape, it is difficult to
At sample, test core sample can not be made and carry out correlation test, especially for thin cut-pff wall, thickness only has 200-400cm, deposits
In the significant technology issues such as through walls, core is imperfect.
Difficult due to sampling on plastic concrete cut-off wall body, current coring method is: taking in machine mouth or slot mouth
Sample, i.e., take plastic concrete sample before pouring, then maintenance molding is tested accordingly.Obviously, the examination that this method obtains
Sample is not that plastic concrete pours the core sample for building up leakage proof wall, and test result only represents the matter of the plastic concrete before pouring
Amount, far from represent poured in mud adverse effect under the conditions of practical wall quality.
Summary of the invention
For the technical problems in the prior art, the object of the present invention is to provide a kind of plastic concrete cut-off walls
Sampling method.
The purpose of the invention is achieved by the following technical solution: a kind of plastic concrete cut-off wall sampling method, to plasticity
Concrete cut sample position is freezed；
Drill hole sampling when being chilled to setting condition.
Preferably, freezing pipe is arranged in plastic concrete cut-off wall lateral surface, when sample position temperature in corresponding sample position
At -20 DEG C or less, boring and coring.
Preferably, freezing pipe is multiple, and multiple freezing pipes are enclosed in respectively on the outside of plastic concrete cut-off wall, solidification point
Control, hereinafter, when freezing the soil body and having handed over to enclose and when reaching set temperature, shows that sample position temperature has reached setting and takes at -20 DEG C
Sample temperature.
Preferably, freezing pipe is squeezed into plastic concrete cut-off wall bottom or set depth.
Preferably, the insertion tapered freezing pipe in head is into plastic concrete cut-off wall bottom or stratum, with pipe rammer handle
Freezing pipe is squeezed among stratum, is rectified a deviation when generating deflection during squeezing into, is sealed freezing pipe nozzle, when driving depth and partially
When gradient reaches sets requirement, suppress leaking hunting, pressure control in 0.8Mpa and no less than 15min, leak hunting pressure process without
Show qualification when variation.
Preferably, sampling finishes after plastic concrete cut-off wall natural thaw, intermittent grouting is carried out to sampling hole, when taking
When slurry is continuously returned in sample hole aperture three times, show to have blocked closely knit.
Preferably, sampling finishes after plastic concrete cut-off wall natural thaw, carries out intermittent grouting to each freezing pipe, when
When freezing pipe nozzle continuously returns slurry three times, show to block freezing pipe closely knit.
Preferably, freezing pipe block it is closely knit after extract freezing pipe, after every extractions section freezing pipe, carry out primary supplement filling
Slurry, until all extracting freezing pipe.
Preferably, it during drill hole sampling, is persistently freezed.
Preferably, adjacent two that plastic concrete cut-off wall same side is arranged in freeze tube spacing from 50-100cm.
The present invention has the following advantages and effects with respect to the prior art:
1, the present invention freezes plastic concrete cut-off wall by implementing, and can completely get plastic concrete cut-off wall core
Sample can intuitively, reliably evaluate plastic concrete cut-off wall pouring quality.
2, the present invention can provide satisfactory core sample for laboratory test, so that test result preferably reflects that plasticity is mixed
The actual state of solidifying soil cut-pff wall.
3, after the present invention takes core sample, to freezing pipe and the timely rockfill grouting of sampling hole, it is unfavorable that freeze thawing bring can be eliminated
It influences.
Detailed description of the invention
Fig. 1 is the schematic diagram that freezing pipe of the invention freezes plastic concrete cut-off wall；
Fig. 2 is the schematic diagram that freezing pipe of the invention extends along plastic concrete cut-off wall.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
A kind of plastic concrete cut-off wall sampling method, freezes plastic concrete cut-off wall sample position 1, to modeling
Property concrete cut carry out freezing it can be made to freeze tightly, intensity greatly improves, and prevents from causing to crack because of sampling or collapsing, together
When be also convenient for getting the core sample met the requirements.
Drill hole sampling when being chilled to setting condition.
Preferably, freezing pipe 2 is arranged in plastic concrete cut-off wall lateral surface, when sample position 1 in corresponding sample position 1
Temperature is at -20 DEG C or less, boring and coring.
Preferably, freezing pipe 2 is multiple, and multiple freezing pipes 2 are enclosed in respectively on the outside of plastic concrete cut-off wall, freezes temperature
Degree control hereinafter, handed over circle 3 and when reaching set temperature when freezing the soil body, shows that 1 temperature of sample position has reached and sets at -20 DEG C
Determine probe temperature.
It can substantially be estimated by daily 20mm the time required to freezing.
Preferably, freezing pipe 2 is squeezed into the set depth into plastic concrete cut-off wall bottom 4 or stratum.
Specifically, the insertion tapered freezing pipe 2 in head, squeezes into freezing pipe 2 among stratum, while also to protect with pipe rammer
It demonstrate,proves 2 orifice sealing device of freezing pipe to seal, securely, blowout prevention, and strict control deflection can be played the role of, when more than sets requirement
When, it should rectify a deviation in time.Orifice sealing device, which can be taken to change, fills out clay to be sealed.When driving depth and deflection reach setting
It is required that when, it should carry out suppressing leak test, pressure is controlled in 0.8Mpa and no less than 15min, shows qualification when pressure is unchanged.
Preferably, sampling finishes after plastic concrete cut-off wall natural thaw, intermittent grouting is carried out to sampling hole, when taking
When slurry is continuously returned in sample hole aperture three times, show to have blocked closely knit.
Preferably, sampling finishes after plastic concrete cut-off wall natural thaw, carries out intermittent grouting to each freezing pipe 2,
When 2 nozzle of freezing pipe continuously returns slurry three times, show to block freezing pipe 2 closely knit.
Preferably, freezing pipe 2 block it is closely knit after extract freezing pipe 2, after one section freezing pipe 2 of every extraction, once supplemented
Grouting, until all extracting freezing pipe 2.
Preferably, it during drill hole sampling, is persistently freezed.
Preferably, freezing pipe 2 is 2-8.It, can be in plastic concrete cut-off wall two if plastic concrete cut-off wall is thicker
Freezing hole is arranged in side more.
Preferably, distance 50-100cm between adjacent two freezing pipe 2 of plastic concrete cut-off wall same side is set.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of plastic concrete cut-off wall sampling method, it is characterised in that: carried out to plastic concrete cut-off wall sample position
Freezing；
Drill hole sampling when being chilled to setting condition.
2. plastic concrete cut-off wall sampling method according to claim 1, which is characterized in that corresponding sample position,
Freezing pipe, when sample position temperature is at -20 DEG C or less, boring and coring is arranged in plastic concrete cut-off wall lateral surface.
3. plastic concrete cut-off wall sampling method according to claim 2, which is characterized in that freezing pipe be it is multiple, it is more
A freezing pipe is enclosed in respectively on the outside of plastic concrete cut-off wall, and solidification point control is at -20 DEG C hereinafter, having handed over when freezing the soil body
When enclosing and reaching set temperature, show that sample position temperature has reached setting probe temperature.
4. plastic concrete cut-off wall sampling method according to claim 2 or 3, which is characterized in that squeeze into freezing pipe
To plastic concrete cut-off wall bottom or set depth.
5. plastic concrete cut-off wall sampling method according to claim 4, which is characterized in that the insertion tapered jelly in head
Pipe is tied into plastic concrete cut-off wall bottom or stratum, freezing pipe is squeezed among stratum with pipe rammer, is produced during squeezing into
It rectifies a deviation when raw deflection, seals freezing pipe nozzle, when driving depth reaches sets requirement with deflection, carry out suppressing survey
Leakage, pressure are controlled in 0.8Mpa and no less than 15min, and the pressure process that leaks hunting shows qualification when unchanged.
6. plastic concrete cut-off wall sampling method according to claim 2, which is characterized in that sampling finishes mixed to plasticity
After solidifying soil cut-pff wall natural thaw, intermittent grouting is carried out to sampling hole and shows to have sealed when slurry is continuously returned three times in sampling hole aperture
It blocks up closely knit.
7. plastic concrete cut-off wall sampling method according to claim 4, which is characterized in that sampling finishes mixed to plasticity
After solidifying soil cut-pff wall natural thaw, intermittent grouting is carried out to each freezing pipe and is shown when freezing pipe nozzle continuously returns slurry three times
Freezing pipe is blocked closely knit.
8. plastic concrete cut-off wall sampling method according to claim 7, which is characterized in that after freezing pipe closure is closely knit
Freezing pipe is extracted, after every extractions section freezing pipe, carries out a supplementary grouting, until all extraction freezing pipes.
9. plastic concrete cut-off wall sampling method according to claim 1, which is characterized in that during drill hole sampling,
Persistently freezed.
10. plastic concrete cut-off wall sampling method according to claim 2, which is characterized in that be arranged in plasticity coagulation
Adjacent the two of native cut-pff wall same side freeze tube spacing from 50-100cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811004458.9A CN109000963A (en) | 2018-08-30 | 2018-08-30 | A kind of plastic concrete cut-off wall sampling method |
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| CN201811004458.9A CN109000963A (en) | 2018-08-30 | 2018-08-30 | A kind of plastic concrete cut-off wall sampling method |
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| CN109000963A true CN109000963A (en) | 2018-12-14 |
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| CN201811004458.9A Pending CN109000963A (en) | 2018-08-30 | 2018-08-30 | A kind of plastic concrete cut-off wall sampling method |
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Application publication date: 20181214 |