CN110258695A - The construction method of big partial size cobble mixed soil hydraulic grab diaphram wall - Google Patents
The construction method of big partial size cobble mixed soil hydraulic grab diaphram wall Download PDFInfo
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- CN110258695A CN110258695A CN201910550864.3A CN201910550864A CN110258695A CN 110258695 A CN110258695 A CN 110258695A CN 201910550864 A CN201910550864 A CN 201910550864A CN 110258695 A CN110258695 A CN 110258695A
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- mud
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
- E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
Abstract
The invention discloses a kind of construction methods of big partial size cobble mixed soil hydraulic grab diaphram wall, specifically completed by following steps: 1) operation platform is laid with, 2) wall production is led, 3) mud production and adjustment, 4) grooving, 5) decentralization connector case and borehole cleaning, 6) decentralization tremie and casting concrete, 7) junction block is pulled, 8) mud conditioning.The present invention can carry out milling slot in common clay geology, also can be in big grain through the smooth milling slot of boulder and cobble geology；Working-noise is small, without friction, pollution-free；Before construction of guide wall, 2.5 meters of thick clays and compaction in layers first are laid in gravel soil layer surface；It leads wall to be made of two sides inverted L-shaped reinforced concrete wall, provides guiding to chute forming machine grooving；After the completion of concreting, concrete guide wall is conserved in time, avoids leading wall deformation under soil body lateral pressure；The total vertical precision of grooving is high, reduces to guarantee dead size in structure and stays the construction surplus put, reduces pollution and destruction to social environment.
Description
Technical field:
The present invention relates to a kind of hydraulic grab diaphram walls in the geologic construction method in riverbed, in particular to a kind of big partial size
The construction method of cobble mixed soil hydraulic grab diaphram wall.
Background technique:
Hydraulic grab uses in more and more underground engineering constructions, and the soft clay area application of Deposits in Eastern Coastal China is especially wide
It is general, and show the performance of its many brilliance.After decades of development with improvement, the conduct of hydraulic grab diaphram wall is shut off anti-
It seeps engineering to be widely applied, it is big partial size ovum calculous soil layer which, which is chiefly used in riverbed geological state, and experimental section uses
Heavy excavation difficulty of construction is larger and foundation pit is easy landslide, after testing by discussion, introduces hydraulic grab construction of diaphragm wall equipment,
It constructs compared to heavy excavation, hydraulic grab construction is not necessarily to slope, precipitation and installation template, and level of ground water and rainwater weather are to applying
Work shadow progress and quality influence substantially reduce, and have saved a large amount of ancillary measure expenses and time, and can be reduced to social environment
Pollution destroys.
Summary of the invention:
The technical problems to be solved by the present invention are: overcoming the deficiencies of the prior art and provide a kind of big partial size cobble mixed soil
The construction method of hydraulic grab diaphram wall constructs with the engineering method, can carry out milling slot in common clay geology,
Also it can be well on milling slot to big grain through boulder and cobble geology, and applicability is wide, working-noise is small, without friction, pollution-free, right
Adjacent Buildings, road traffic, the influence of underground utilities are small.
The present invention is adopted the technical scheme that in order to solve the technical problem:
A kind of construction method of big partial size cobble mixed soil hydraulic grab diaphram wall, steps are as follows:
Preparation includes:
1) material, equipment and equipment needed for preparing construction, specific as follows:
Biaxial rneader 1,8, slush pump, send 200 meters of pipeline of slurry, the double-deck reciprocating sieve 1,1 set of eddy flow scummer, at waste pulp
Reason equipment chute forming machine 1, BH-12 type chute forming machine 2,1,25T crane, 4, connector case, wire type brush wall device 1, pour it is mixed
Solidifying soil 1 set of conduit, pump type oil jack (tube drawing) equipment 2, quality detection apparatus, measuring instrument, steel bar processing equipment；
2) it checks the inspection of hydraulic grab wirerope, scraps processing to what fracture of wire, abrasion reached that wirerope scraps coefficient, it must not be after
It is continuous to use；
3) the protection work for carrying out local water system, vegetation carries out protection and greening vegetation to roadbed side slope in construction in time, applies
Work vehicle must not cross the border traveling, in order to avoid grind bad vegetation, road etc.；
Operating procedure:
1) operation platform is laid with
The row construction of guide wall after gravel soil layer surface is laid with 2.5 meters thick clay compaction in layers, leads wall by two sides inverted L-shaped reinforced concrete
Cob wall body composition, the benchmark of level and vertical measurement when as construction;
2) wall production is led:
A, center line is released；
B, on original riverbed within the scope of 2.5 meters of center line two sides back-filling in layers backfill red clay, every thickness degree 50cm, it is smooth simultaneously
Compacting, 2 meters of backfill height, pays attention to control platform elevation in backfilling process；7.5 meters of wide constructions are built in the side of backfill clay
Sidewalk, 2 meters of height；Before leading wall excavation construction, check antiseepage center line of wall again (as center line of wall is led)；
C, wall excavation, reinforcing bar binding, template installation, concreting are led；After the completion of pouring, concrete guide wall is supported in time
Shield, the leading backfill support within the walls of grooving, avoids leading wall deformation under soil body lateral pressure, leads wall concrete strength >=90%, can carry out
Grooving operation；
3) mud production and adjustment:
A, density: mud density depends on the content of solid (bentonite) substance in Mud Property match ratio, the density of mud
Range is 1.03-1.15,1 cube of water adapted bentonite 70KG to 75KG in construction；
B, viscosity: bentonite slurry: viscosity 32-50s(Marsh funnel measurement)；Meeting thicker flour sand, fine sand stratum (especially
10cm or more) when, viscosity index, 37-52s can be properly increased；
C, fluid loss and mudcake property: brand-new fluid loss is at 18ml/30 minutes hereinafter, mudcake requires fine and close tough and tensile, thickness
≤2.5mm；To the mud in recycling, due to the pollutions such as the calcium ion of soil sand particle being mixed into soil and underground water, performance
It can deteriorate gradually, fluid loss is controlled at 18ml/30 minutes and 2.5mm or less；
D, pH value: mud is polluted by metal cations such as calcium ions in cement, underground water and soil in construction, and mud can lose
Suspension property generates flocks, and pH value increases, and generally requiring pH value to new mud is 8-9, exists to using middle mud pH value to control
7-11；
E, sand content: brand-new mud silt content≤4%, circulating mud silt content≤6%；
4) grooving
A, after the completion of construction of guide wall, several unit groove sections are divided into wall is led, unit groove section should comprehensively consider geology item
The factors such as part, structural requirement, ambient enviroment, mechanical equipment, execution conditions are divided, and slot segment length is generally 4-6m；Grooving
Machinery uses BH-12 type hydraulic grab bucket grooving machine, this model chute forming machine is suitable for sandy soil, clay and partial size in 30cm or less gravel
Soil, maximum are 40 meters at groove depth；
B, when carrying out slot excavation, conveying mud is carried out into slot section in time, guarantees that mud face height distance leads wall top portion
30-50 centimeters, one section of slot, which excavates, is generally 3 apertures, and sequence of excavation is intermediate behind first both sides；During grooving, grab bucket into
Slot, go out slot need at a slow speed, it is reliable, rectified a deviation in time according to chute forming machine instrument and the verticality of actual measurement；Mud property is strictly pressed in the process
Index request controls quality of mud fluid, it is ensured that mud off effect；
C, for groove depth using the lining rope measurement demarcated, every width surveys at 2~3 points according to its width, while digging according to the control of wall absolute altitude is led
The depth of slot guarantees projected depth；After grooving, using special-purpose ultrasonic detector, detects the verticality of cell wall and open
Dig depth；
D, after the completion of grooving operation, sediment is cleared up, and the mud cleaned out is transported in mud veclamation slot, is separated by scalping
After mud, sedimentation basin separation mud, cyclone separation mud, vibrosieve are from mud, poor mud is transported to using tinning vehicle
Countryside specified point, allows its natural decomposition to precipitate, and good mud is recycled；
5) connector case and borehole cleaning are transferred
A, connector case uses construction joint, that is, the longitudinally connected connector of two adjacent elementary sections when pouring diaphram wall；
B, for a phase slot pair, slot both ends are required to setting connector case after the completion of pore-forming, dock head case before transferring connector case
Surface impurity is cleared up, it is ensured that cabinet neat and tidy, the verticality of strict control connector case when decentralization；
C, for the second stage of slot pair, then no setting is required that connector case need to be cleaned with water with brush wall device butt joint, be avoided after the completion of excavation
There are the impurity absorptions such as clay in joint；
D, after whole groove segment is dug on earth, it is necessary to carry out cleaning bottom of hole, even the wall surface for grabbing socket part position out and excavate slot bottom sediment；Construction method
Are as follows: regularly shovel is dug from one end to the other side, every mobile 50cm or so, grabs deep control in same designed elevation；Cleaning bottom of hole terminates
After carry out brush wall, brush wall must be carried out using heavy grab bucket side welding point brush, brush wall before borehole cleaning, each terminal bruss wall
Number >=10 times, when brush wall terminates not when there is silt on brush wall device；
E, one hour after the completion of brush wall, borehole cleaning and mud displacement are carried out；Borehole cleaning uses Pump breath countercirculate method, is extracted out with gravel pump
Mud returns to slot after mud purifiers purified treatment, while fresh mud is supplemented into slot, and changing slurry amount is about mud in slot
Starch the 1/3 of total amount；
F, the second stage of slot borehole cleaning is changed before slurry terminates, and scrubs the mudcake of a phase slot end with the segmentation of brush drill bit and stratum remains
Object, with, substantially without spare, bottom hole siltation is not further added by as criterion of acceptability on brush drill bit；1h reaches after slot borehole cleaning changes slurry
To following standard: slot bottom deposition thickness≤10cm, mud sample position is away from bottom hole 0.5-1.5m, mud density≤1.15g/ in slot
Cm3, Marsh funnel viscosity 32s~50s, sand content≤6%；
G, casting concrete in 4h after borehole cleaning is qualified, such as because embedded facility need to extend the time, report supervisor ratifies and takes it
It prevents the measure of siltation, opens before pouring, if siltation is more than borehole cleaning standard in hole, re-starts borehole cleaning；
6) tremie and casting concrete are transferred
The pouring technique of concrete and casting underwater concrete construction are essentially identical, and the internal diameter of tremie should not be too small, opens
Begin first put diameter bladders identical with catheter diameter in conduit before casting；Conduit lower end and slot bottom distance≤20 are public
Point；Concrete feeding must be continuous, meets 20 cubic metres or more per hour, the slump 18~22cm workability is good fresh
Concrete (when pouring discontinuous, should prevent conduit inner concrete frozen plug), same to clear up after concrete casting
Extra mud is transported in accumulator tank by sediment, separates mud by scalping separation mud, sedimentation basin separation mud, cyclone
After slurry, vibrosieve are from mud, poor mud is transported to countryside specified point using tinning vehicle, its natural decomposition is allowed to precipitate, good
Mud is recycled；
7) junction block (case) is pulled
A, after junction block (case) installation is in place, hydraulic top drawing machine is then installed；Observe the solidification situation of concrete, the first vehicle concrete to scene
Afterwards, scene takes concrete test block, is placed in construction site, determines to judge the solidification situation of concrete, and according to the practical feelings portion condition of concrete
The loosening of junction block (case) and extraction time；
B, junction block (case) is carried out rising for the first time after filling concrete 3~4 hours and be pulled out, and is promoted once, often within hereafter every 30 minutes
Secondary 5-10cm, until all being extracted after final set；
C, junction block (case) extract before, first calculate remain junction block (case) bottom position in slot, in conjunction with concrete pour record and
Live test block situation, determining could extract after bottom concrete has reached final set；Before final section junction block (case) is extracted, reinforcing bar is first used
Inserting concrete at the top of examination wall could extract after having hard sense；
D, junction block (case) is pulled by hydraulic top drawing machine, crawler crane work compound, segmentation disassembly；
8) waste aluminum recycling
Diaphram wall slurry coat method gradually degrades in recycling, and deterioration mud is transported to countryside using tinning vehicle and specifies
Point allows its natural decomposition to precipitate；Good mud carries out the use of mud reproduction after mud separator purifies.
The operating procedure 1) in, guiding wall wants straight firm, and inside spacing is 5~20cm bigger than thickness of wall body, construction
Clear span 69cm among guide groove when 60cm thickness cut-pff wall；It is parallel to antiseepage center line of wall, center line is overlapped with cut-pff wall axis,
Its tolerance is ± 1.5cm；It is oriented to wall elevation of top surface (entirety) tolerance ± 2.0cm.
In the operating procedure, in the higher situation of level of ground water, mud balance can be improved, but no more than 1.25
The index upper limit.
In the operating procedure, wall surface is smooth to have a small amount of thin silt in 10m or more, and wall surface is allowed to have small area stripping
It falls, height≤2m, depth≤50cm.
In the operating procedure, before single width casting terminates, conduit inside and outside differential pressure reduces, and pipe laying depth is relaxed to 1-4m.
The operating procedure 3) in, mud raw material are high-quality bentonite.
Beneficial effect of the invention is:
1, the present invention takes a point slot section construction, and speed is fast, and for slot width plane length generally in 4-6m, hydraulic grab shoveling is high-efficient,
The common construction of diaphragm wall of one width 6m wide, 10m depth can be completed in 12h.
2, the total vertical precision of grooving of the present invention is very high, guarantees dead size in structure to substantially reduce and stays and put
Construction surplus, reduces waste.
3, the present invention constructs compared to heavy excavation, and hydraulic grab construction is not necessarily to slope, precipitation and installation template, saves
A large amount of ancillary measure expenses and time, and can be reduced pollution, destruction to social environment, reduce level of ground water and rainwater weather
Influence to construction speed and quality.
4, strong applicability of the present invention, in addition to milling slot can be carried out in common clay geology, through boulder and cobble to big grain
Matter also can smooth milling slot, native soil layer is disturbed it is smaller, without rolling and can carry out to soil layer around after the completion of construction
Next process.
5, the present invention leads wall and is made of two sides inverted L-shaped reinforced concrete wall, it acts as: it is led to chute forming machine grooving offer
To, and bear the load of trench machine；It stores mud and prevents notch Tu Bi from collapsing；Level and vertical measurement when as construction
Benchmark；Guarantee the geometric dimension and shape of diaphram wall design.
7, slot borehole cleaning of the present invention use Pump breath countercirculate method, with gravel pump extract out mud through mud purifiers purification at
Slot is returned after reason, while supplementing fresh mud into slot, and the sufficiently cleaned up of mud is conducive to control mud property index, reduces
Accident improves pore-creating quality, is conducive to the guarantee of concrete pouring quality；Mechanical mill is advantageously reduced to efficiently separating for native slag
Damage improves pore-creating work efficiency；The reuse of mud is conducive to save mud-making material, greatly reduces construction cost, reduce ring
Border pollution, discards the mud being heavily polluted.
Specific embodiment:
A kind of construction method of big partial size cobble mixed soil hydraulic grab diaphram wall, steps are as follows:
Preparation includes:
1) material, equipment and equipment needed for preparing construction, specific as follows:
Biaxial rneader 1,8, slush pump, send 200 meters of pipeline of slurry, the double-deck reciprocating sieve 1,1 set of eddy flow scummer, at waste pulp
Reason equipment chute forming machine 1, BH-12 type chute forming machine 2,1,25T crane, 4, connector case, wire type brush wall device 1, pour it is mixed
Solidifying soil 1 set of conduit, pump type oil jack (tube drawing) equipment 2, quality detection apparatus, measuring instrument, steel bar processing equipment；
2) it checks the inspection of hydraulic grab wirerope, scraps processing to what fracture of wire, abrasion reached that wirerope scraps coefficient, it must not be after
It is continuous to use；
3) the protection work for carrying out local water system, vegetation carries out protection and greening vegetation to roadbed side slope in construction in time, applies
Work vehicle must not cross the border traveling, in order to avoid grind bad vegetation, road etc.；
Operating procedure:
1) operation platform is laid with
The row construction of guide wall after gravel soil layer surface is laid with 2.5 meters thick clay compaction in layers, leads wall by two sides inverted L-shaped reinforced concrete
Cob wall body composition, the benchmark of level and vertical measurement when as construction;
2) wall production is led:
A, center line is released；
B, on original riverbed within the scope of 2.5 meters of center line two sides back-filling in layers backfill red clay, every thickness degree 50cm, it is smooth simultaneously
Compacting, 2 meters of backfill height, pays attention to control platform elevation in backfilling process；7.5 meters of wide constructions are built in the side of backfill clay
Sidewalk, 2 meters of height；Before leading wall excavation construction, check antiseepage center line of wall again (as center line of wall is led)；
C, wall excavation, reinforcing bar binding, template installation, concreting are led；After the completion of pouring, concrete guide wall is supported in time
Shield, the leading backfill support within the walls of grooving, avoids leading wall deformation under soil body lateral pressure, leads wall concrete strength >=90%, can carry out
Grooving operation；
3) mud production and adjustment:
A, density: mud density depends on the content of solid (bentonite) substance in Mud Property match ratio, the density of mud
Range is 1.03-1.15,1 cube of water adapted bentonite 70KG to 75KG in construction；
B, viscosity: bentonite slurry: viscosity 32-50s(Marsh funnel measurement)；Meeting thicker flour sand, fine sand stratum (especially
10cm or more) when, viscosity index, 37-52s can be properly increased；
C, fluid loss and mudcake property: brand-new fluid loss is at 18ml/30 minutes hereinafter, mudcake requires fine and close tough and tensile, thickness
≤2.5mm；To the mud in recycling, due to the pollutions such as the calcium ion of soil sand particle being mixed into soil and underground water, performance
It can deteriorate gradually, fluid loss is controlled at 18ml/30 minutes and 2.5mm or less；
D, pH value: mud is polluted by metal cations such as calcium ions in cement, underground water and soil in construction, and mud can lose
Suspension property generates flocks, and pH value increases, and generally requiring pH value to new mud is 8-9, exists to using middle mud pH value to control
7-11；
E, sand content: brand-new mud silt content≤4%, circulating mud silt content≤6%；
4) grooving
A, after the completion of construction of guide wall, several unit groove sections are divided into wall is led, unit groove section should comprehensively consider geology item
The factors such as part, structural requirement, ambient enviroment, mechanical equipment, execution conditions are divided, and slot segment length is generally 4-6m；Grooving
Machinery uses BH-12 type hydraulic grab bucket grooving machine, this model chute forming machine is suitable for sandy soil, clay and partial size in 30cm or less gravel
Soil, maximum are 40 meters at groove depth；
B, when carrying out slot excavation, conveying mud is carried out into slot section in time, guarantees that mud face height distance leads wall top portion
30-50 centimeters, one section of slot, which excavates, is generally 3 apertures, and sequence of excavation is intermediate behind first both sides；During grooving, grab bucket into
Slot, go out slot need at a slow speed, it is reliable, rectified a deviation in time according to chute forming machine instrument and the verticality of actual measurement；Mud property is strictly pressed in the process
Index request controls quality of mud fluid, it is ensured that mud off effect；
C, for groove depth using the lining rope measurement demarcated, every width surveys at 2~3 points according to its width, while digging according to the control of wall absolute altitude is led
The depth of slot guarantees projected depth；After grooving, using special-purpose ultrasonic detector, detects the verticality of cell wall and open
Dig depth；
D, after the completion of grooving operation, sediment is cleared up, and the mud cleaned out is transported in mud veclamation slot, is separated by scalping
After mud, sedimentation basin separation mud, cyclone separation mud, vibrosieve are from mud, poor mud is transported to using tinning vehicle
Countryside specified point, allows its natural decomposition to precipitate, and good mud is recycled；
5) connector case and borehole cleaning are transferred
A, connector case uses construction joint, that is, the longitudinally connected connector of two adjacent elementary sections when pouring diaphram wall；
B, for a phase slot pair, slot both ends are required to setting connector case after the completion of pore-forming, dock head case before transferring connector case
Surface impurity is cleared up, it is ensured that cabinet neat and tidy, the verticality of strict control connector case when decentralization；
C, for the second stage of slot pair, then no setting is required that connector case need to be cleaned with water with brush wall device butt joint, be avoided after the completion of excavation
There are the impurity absorptions such as clay in joint；
D, after whole groove segment is dug on earth, it is necessary to carry out cleaning bottom of hole, even the wall surface for grabbing socket part position out and excavate slot bottom sediment；Construction method
Are as follows: regularly shovel is dug from one end to the other side, every mobile 50cm or so, grabs deep control in same designed elevation；Cleaning bottom of hole terminates
After carry out brush wall, brush wall must be carried out using heavy grab bucket side welding point brush, brush wall before borehole cleaning, each terminal bruss wall
Number >=10 times, when brush wall terminates not when there is silt on brush wall device；
E, one hour after the completion of brush wall, borehole cleaning and mud displacement are carried out；Borehole cleaning uses Pump breath countercirculate method, is extracted out with gravel pump
Mud returns to slot after mud purifiers purified treatment, while fresh mud is supplemented into slot, and changing slurry amount is about mud in slot
Starch the 1/3 of total amount；
F, the second stage of slot borehole cleaning is changed before slurry terminates, and scrubs the mudcake of a phase slot end with the segmentation of brush drill bit and stratum remains
Object, with, substantially without spare, bottom hole siltation is not further added by as criterion of acceptability on brush drill bit；1h reaches after slot borehole cleaning changes slurry
To following standard: slot bottom deposition thickness≤10cm, mud sample position is away from bottom hole 0.5-1.5m, mud density≤1.15g/ in slot
Cm3, Marsh funnel viscosity 32s~50s, sand content≤6%；
G, casting concrete in 4h after borehole cleaning is qualified, such as because embedded facility need to extend the time, report supervisor ratifies and takes it
It prevents the measure of siltation, opens before pouring, if siltation is more than borehole cleaning standard in hole, re-starts borehole cleaning；
6) tremie and casting concrete are transferred
The pouring technique of concrete and casting underwater concrete construction are essentially identical, and the internal diameter of tremie should not be too small, opens
Begin first put diameter bladders identical with catheter diameter in conduit before casting；Conduit lower end and slot bottom distance≤20 are public
Point；Concrete feeding must be continuous, meets 20 cubic metres or more per hour, the slump 18~22cm workability is good fresh
Concrete (when pouring discontinuous, should prevent conduit inner concrete frozen plug), same to clear up after concrete casting
Extra mud is transported in accumulator tank by sediment, separates mud by scalping separation mud, sedimentation basin separation mud, cyclone
After slurry, vibrosieve are from mud, poor mud is transported to countryside specified point using tinning vehicle, its natural decomposition is allowed to precipitate, good
Mud is recycled；
7) junction block (case) is pulled
A, after junction block (case) installation is in place, hydraulic top drawing machine is then installed；Observe the solidification situation of concrete, the first vehicle concrete to scene
Afterwards, scene takes concrete test block, is placed in construction site, determines to judge the solidification situation of concrete, and according to the practical feelings portion condition of concrete
The loosening of junction block (case) and extraction time；
B, junction block (case) is carried out rising for the first time after filling concrete 3~4 hours and be pulled out, and is promoted once, often within hereafter every 30 minutes
Secondary 5-10cm, until all being extracted after final set；
C, junction block (case) extract before, first calculate remain junction block (case) bottom position in slot, in conjunction with concrete pour record and
Live test block situation, determining could extract after bottom concrete has reached final set；Before final section junction block (case) is extracted, reinforcing bar is first used
Inserting concrete at the top of examination wall could extract after having hard sense；
D, junction block (case) is pulled by hydraulic top drawing machine, crawler crane work compound, segmentation disassembly；
8) waste aluminum recycling
Diaphram wall slurry coat method gradually degrades in recycling, and deterioration mud is transported to countryside using tinning vehicle and specifies
Point allows its natural decomposition to precipitate；Good mud carries out the use of mud reproduction after mud separator purifies.
In wherein: the operating procedure 1), guiding wall wants straight firm, and inside spacing is 5~20cm bigger than thickness of wall body, applies
Clear span 69cm among guide groove when work 60cm thickness cut-pff wall；It is parallel to antiseepage center line of wall, center line and cut-pff wall axis weight
It closes, tolerance is ± 1.5cm；It is oriented to wall elevation of top surface (entirety) tolerance ± 2.0cm；In the higher feelings of level of ground water
Under condition, mud balance can be improved, but no more than the 1.25 index upper limit；Wall surface it is smooth 10m or more with having a small amount of Extra-fine sand
Layer allows wall surface to have small area peeling, height≤2m, depth≤50cm；Before single width casting terminates, conduit inside and outside differential pressure reduces,
Pipe laying depth is relaxed to 1-4m；Mud raw material are high-quality bentonite.
The preparation of mud: it when Slurry confection according to the proportion by the high-quality bentonite of raw material, feeds intake after weighing, a, bentonite add water
Punching trembles five minutes b, CMC and after soda ash adds water and stirs five minutes, and both a and b are mixed three minutes, examined by mud property
It is spare after swelling 24 hours after survey；The full name carboxymethyl cellulose of CMC, can increase mud viscosity, and scholar's layer surface is made to form film
And protect hole wall to peel off and play the role of reducing fluid loss, incorporation is bentonitic 0. 05% ~ 0. 1%.Soda ash main component
It is sodium carbonate (Na2C03), its effect can make pH value increase to 10, when pH value is too small in mud, and clay particle is difficult to decompose,
Viscosity reduces fluid loss and increases mobility reduction;When less than 7, can also drilling tool be made to be corroded, if pH value is excessive, mud will
It penetrates into the clay of hole wall, softens hole wall surface, intend poly- power between clay particle and weaken, cause to crack and hole wall is made to collapse
It collapses；PH value is advisable with 8 ~ 10, can increase aquation film thickness, improve slurry colloidity and stability and reduce fluid loss；Incorporation
Amount is bentonitic 0.3% ~ 0. 5%.
Claims (6)
1. a kind of construction method of big partial size cobble mixed soil hydraulic grab diaphram wall, steps are as follows:
Preparation includes:
1) material, equipment and equipment needed for preparing construction, specific as follows:
Biaxial rneader 1,8, slush pump, send 200 meters of pipeline of slurry, the double-deck reciprocating sieve 1,1 set of eddy flow scummer, at waste pulp
Reason equipment chute forming machine 1, BH-12 type chute forming machine 2,1,25T crane, 4, connector case, wire type brush wall device 1, pour it is mixed
Solidifying soil 1 set of conduit, pump type oil jack (tube drawing) equipment 2, quality detection apparatus, measuring instrument, steel bar processing equipment；
2) it checks the inspection of hydraulic grab wirerope, scraps processing to what fracture of wire, abrasion reached that wirerope scraps coefficient, it must not be after
It is continuous to use；
3) the protection work for carrying out local water system, vegetation carries out protection and greening vegetation to roadbed side slope in construction in time, applies
Work vehicle must not cross the border traveling, in order to avoid grind bad vegetation, road etc.；
Operating procedure:
1) operation platform is laid with
The row construction of guide wall after gravel soil layer surface is laid with 2.5 meters thick clay compaction in layers, leads wall by two sides inverted L-shaped reinforced concrete
Cob wall body composition, the benchmark of level and vertical measurement when as construction;
2) wall production is led:
A, center line is released；
B, on original riverbed within the scope of 2.5 meters of center line two sides back-filling in layers backfill red clay, every thickness degree 50cm, it is smooth simultaneously
Compacting, 2 meters of backfill height, pays attention to control platform elevation in backfilling process；7.5 meters of wide constructions are built in the side of backfill clay
Sidewalk, 2 meters of height；Before leading wall excavation construction, check antiseepage center line of wall again (as center line of wall is led)；
C, wall excavation, reinforcing bar binding, template installation, concreting are led；After the completion of pouring, concrete guide wall is supported in time
Shield, the leading backfill support within the walls of grooving, avoids leading wall deformation under soil body lateral pressure, leads wall concrete strength >=90%, can carry out
Grooving operation；
3) mud production and adjustment:
A, density: mud density depends on the content of solid (bentonite) substance in Mud Property match ratio, the density of mud
Range is 1.03-1.15,1 cube of water adapted bentonite 70KG to 75KG in construction；
B, viscosity: bentonite slurry: viscosity 32-50s(Marsh funnel measurement)；Meeting thicker flour sand, fine sand stratum (especially
10cm or more) when, viscosity index, 37-52s can be properly increased；
C, fluid loss and mudcake property: brand-new fluid loss is at 18ml/30 minutes hereinafter, mudcake requires fine and close tough and tensile, thickness
≤2.5mm；To the mud in recycling, due to the pollutions such as the calcium ion of soil sand particle being mixed into soil and underground water, performance
It can deteriorate gradually, fluid loss is controlled at 18ml/30 minutes and 2.5mm or less；
D, pH value: mud is polluted by metal cations such as calcium ions in cement, underground water and soil in construction, and mud can lose
Suspension property generates flocks, and pH value increases, and generally requiring pH value to new mud is 8-9, exists to using middle mud pH value to control
7-11；
E, sand content: brand-new mud silt content≤4%, circulating mud silt content≤6%；
4) grooving
A, after the completion of construction of guide wall, several unit groove sections are divided into wall is led, unit groove section should comprehensively consider geology item
The factors such as part, structural requirement, ambient enviroment, mechanical equipment, execution conditions are divided, and slot segment length is generally 4-6m；Grooving
Machinery uses BH-12 type hydraulic grab bucket grooving machine, this model chute forming machine is suitable for sandy soil, clay and partial size in 30cm or less gravel
Soil, maximum are 40 meters at groove depth；
B, when carrying out slot excavation, conveying mud is carried out into slot section in time, guarantees that mud face height distance leads wall top portion
30-50 centimeters, one section of slot, which excavates, is generally 3 apertures, and sequence of excavation is intermediate behind first both sides；During grooving, grab bucket into
Slot, go out slot need at a slow speed, it is reliable, rectified a deviation in time according to chute forming machine instrument and the verticality of actual measurement；Mud property is strictly pressed in the process
Index request controls quality of mud fluid, it is ensured that mud off effect；
C, for groove depth using the lining rope measurement demarcated, every width surveys at 2~3 points according to its width, while digging according to the control of wall absolute altitude is led
The depth of slot guarantees projected depth；After grooving, using special-purpose ultrasonic detector, detects the verticality of cell wall and open
Dig depth；
D, after the completion of grooving operation, sediment is cleared up, and the mud cleaned out is transported in mud veclamation slot, is separated by scalping
After mud, sedimentation basin separation mud, cyclone separation mud, vibrosieve are from mud, poor mud is transported to using tinning vehicle
Countryside specified point, allows its natural decomposition to precipitate, and good mud is recycled；
5) connector case and borehole cleaning are transferred
A, connector case uses construction joint, that is, the longitudinally connected connector of two adjacent elementary sections when pouring diaphram wall；
B, for a phase slot pair, slot both ends are required to setting connector case after the completion of pore-forming, dock head case before transferring connector case
Surface impurity is cleared up, it is ensured that cabinet neat and tidy, the verticality of strict control connector case when decentralization；
C, for the second stage of slot pair, then no setting is required that connector case need to be cleaned with water with brush wall device butt joint, be avoided after the completion of excavation
There are the impurity absorptions such as clay in joint；
D, after whole groove segment is dug on earth, it is necessary to carry out cleaning bottom of hole, even the wall surface for grabbing socket part position out and excavate slot bottom sediment；Construction method
Are as follows: regularly shovel is dug from one end to the other side, every mobile 50cm or so, grabs deep control in same designed elevation；Cleaning bottom of hole terminates
After carry out brush wall, brush wall must be carried out using heavy grab bucket side welding point brush, brush wall before borehole cleaning, each terminal bruss wall
Number >=10 times, when brush wall terminates not when there is silt on brush wall device；
E, one hour after the completion of brush wall, borehole cleaning and mud displacement are carried out；Borehole cleaning uses Pump breath countercirculate method, is extracted out with gravel pump
Mud returns to slot after mud purifiers purified treatment, while fresh mud is supplemented into slot, and changing slurry amount is about mud in slot
Starch the 1/3 of total amount；
F, the second stage of slot borehole cleaning is changed before slurry terminates, and scrubs the mudcake of a phase slot end with the segmentation of brush drill bit and stratum remains
Object, with, substantially without spare, bottom hole siltation is not further added by as criterion of acceptability on brush drill bit；1h reaches after slot borehole cleaning changes slurry
To following standard: slot bottom deposition thickness≤10cm, mud sample position is away from bottom hole 0.5-1.5m, mud density≤1.15g/ in slot
Cm3, Marsh funnel viscosity 32s~50s, sand content≤6%；
G, casting concrete in 4h after borehole cleaning is qualified, such as because embedded facility need to extend the time, report supervisor ratifies and takes it
It prevents the measure of siltation, opens before pouring, if siltation is more than borehole cleaning standard in hole, re-starts borehole cleaning；
6) tremie and casting concrete are transferred
The pouring technique of concrete and casting underwater concrete construction are essentially identical, and the internal diameter of tremie should not be too small, opens
Begin first put diameter bladders identical with catheter diameter in conduit before casting；Conduit lower end and slot bottom distance≤20 are public
Point；Concrete feeding must be continuous, meets 20 cubic metres or more per hour, the slump 18~22cm workability is good fresh
Concrete (when pouring discontinuous, should prevent conduit inner concrete frozen plug), same to clear up after concrete casting
Extra mud is transported in accumulator tank by sediment, separates mud by scalping separation mud, sedimentation basin separation mud, cyclone
After slurry, vibrosieve are from mud, poor mud is transported to countryside specified point using tinning vehicle, its natural decomposition is allowed to precipitate, good
Mud is recycled；
7) junction block (case) is pulled
A, after junction block (case) installation is in place, hydraulic top drawing machine is then installed；Observe the solidification situation of concrete, the first vehicle concrete to scene
Afterwards, scene takes concrete test block, is placed in construction site, determines to judge the solidification situation of concrete, and according to the practical feelings portion condition of concrete
The loosening of junction block (case) and extraction time；
B, junction block (case) is carried out rising for the first time after filling concrete 3~4 hours and be pulled out, and is promoted once, often within hereafter every 30 minutes
Secondary 5-10cm, until all being extracted after final set；
C, junction block (case) extract before, first calculate remain junction block (case) bottom position in slot, in conjunction with concrete pour record and
Live test block situation, determining could extract after bottom concrete has reached final set；Before final section junction block (case) is extracted, reinforcing bar is first used
Inserting concrete at the top of examination wall could extract after having hard sense；
D, junction block (case) is pulled by hydraulic top drawing machine, crawler crane work compound, segmentation disassembly；
8) waste aluminum recycling
Diaphram wall slurry coat method gradually degrades in recycling, and deterioration mud is transported to countryside using tinning vehicle and specifies
Point allows its natural decomposition to precipitate；Good mud carries out the use of mud reproduction after mud separator purifies.
2. the construction method of big partial size cobble mixed soil diaphram wall according to claim 1, it is characterised in that: described
Operating procedure 1) in, guiding wall want straight firm, inside spacing is 5~20cm bigger than thickness of wall body, construct 60cm thickness cut-pff wall when
Clear span 69cm among guide groove；Be parallel to antiseepage center line of wall, center line is overlapped with cut-pff wall axis, tolerance be ±
1.5cm；It is oriented to wall elevation of top surface (entirety) tolerance ± 2.0cm.
3. the construction method of big partial size cobble mixed soil diaphram wall according to claim 1, it is characterised in that: described
In operating procedure, in the higher situation of level of ground water, mud balance can be improved, but no more than the 1.25 index upper limit.
4. the construction method of big partial size cobble mixed soil diaphram wall according to claim 1, it is characterised in that: described
In operating procedure, wall surface is smooth to have a small amount of thin silt in 10m or more, and wall surface is allowed to have small area peeling, and height≤2m is deep
Degree≤50cm.
5. the construction method of big partial size cobble mixed soil hydraulic grab diaphram wall according to claim 1, feature
Be: in the operating procedure, before single width casting terminates, conduit inside and outside differential pressure reduces, and pipe laying depth is relaxed to 1-4m.
6. the construction method of big partial size cobble mixed soil hydraulic grab diaphram wall according to claim 1, feature
It is: the operating procedure 3) in, mud raw material are high-quality bentonite.
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| CN110725301A (en) * | 2019-10-19 | 2020-01-24 | 湖北广元岩土工程有限公司 | Underground continuous wall construction method |
| CN114277852A (en) * | 2021-12-02 | 2022-04-05 | 内蒙古平庄煤业(集团)有限责任公司 | Water-intercepting curtain ultra-deep impervious wall joint box and construction method |
| CN114394723A (en) * | 2022-01-18 | 2022-04-26 | 武汉誉城千里建工有限公司 | Treatment and comprehensive utilization method of foundation engineering slurry |
| CN114737585A (en) * | 2022-03-14 | 2022-07-12 | 浙江迅犀建设有限责任公司 | Precipitation construction method for deep foundation pit of thin-wall plastic concrete cut-off wall |
| CN115126030A (en) * | 2022-07-13 | 2022-09-30 | 昆明捷程桩工有限责任公司 | Underwater dredging movable multifunctional operation platform and operation mode |
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