CN106192907A - Set up the construction method of 150m～the 300m level high concrete panel rock-fill dams of cement sand and gravel structure sheaf - Google Patents
Set up the construction method of 150m～the 300m level high concrete panel rock-fill dams of cement sand and gravel structure sheaf Download PDFInfo
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- CN106192907A CN106192907A CN201610539635.8A CN201610539635A CN106192907A CN 106192907 A CN106192907 A CN 106192907A CN 201610539635 A CN201610539635 A CN 201610539635A CN 106192907 A CN106192907 A CN 106192907A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/06—Earth-fill dams; Rock-fill dams
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Abstract
The invention belongs to water power hydraulic engineering hydraulic structure technical field, particularly relate to set up the construction method of 150m～the 300m level high concrete panel rock-fill dams of cement sand and gravel structure sheaf.The present invention proposes to set up the construction method of 150m～the 300m level high concrete panel rock-fill dams of cement sand and gravel structure sheaf, including arranging cement sand and gravel structure sheaf between described concrete slab and bed course district.The present invention is to set up cement sand and gravel structure sheaf between concrete slab and bedding material, dam concrete panel is played secondary and prevents blending the effect of support, improve the harmony of concrete slab and cemented gravel dam deformation, cause the technical barrier of concrete slab fall damage because of seepage deformation solving dam.
Description
Technical field
The invention belongs to water power hydraulic engineering hydraulic structure technical field, particularly relate to set up cement sand and gravel structure sheaf
The construction method of 150m～300m level high concrete panel rock-fill dams.
Background technology
In order to preserve the ecological environment, reduce the primary energy pollution to atmospheric environment, make full use of regeneration and clean energy resource,
Greatly develop hydropower Industry, and Hydropower Dam is the main hydraulic structure that must build.And CFRD is to fill
Point utilize local material dam, not only economy but also quickly, be particularly suitable for remote mountain areas, especially the west area of China.
China, within 1985, having started to build by modern technologies since CFRD builds up, has passed by 30 years and has sent out
Exhibition course.In more than 220 all kinds of face dams of built high more than 30m, height of dam 100m level have 64, height of dam 150m level 15
Seat, and has built up Tianshengqiao-I successively, a collection of 200m level high dam such as Hong Jiadu, three Ban Xi and water cloth a strip of land between hills, have accumulated abundant
Scientific research, design, construct, the modern technologies experience such as operational management and monitoring.
China's western high concrete panel rock-fill dams preparing to build multiple 300m, Ba Gongjie has launched to build 300m
The technical research of level high concrete panel rock-fill dams feasibility.For the high concrete panel rock-fill dams of 150m～300m level,
There is dam settlement stable phase long, settling amount is big, and concrete slab comes to nothing or the risk of the plate that breaks is big, to high earth and rockfill dam dam
Stablize unfavorable, the features such as antiseismic venture influence factor is many.
Invention patent mandate notification number CN101935995B discloses rock-fill concrete and cement sand and gravel (CSG), compound
Material dam and design and construction method thereof.This composite material dam dam body is by rock-fill concrete part and cement sand and gravel part group
Becoming, composite material dam upstream side dam body is described rock-fill concrete part, and downstream dam body is described cement sand and gravel part.Heap
Stone concrete part uses rock-fill concrete (RFC) material to pour.Cement sand and gravel part uses cement sand and gravel material to pour.
The advantage that can simultaneously play RFC and CSG bi-material, owing to dam body upstream side uses rock-fill concrete to pour, can save upstream
The operation of face slab for water retaining is arranged in face, simplifies construction, reduction of erection time, reduces dam body quantities；Channel sand gravel, excavation waste can be used
Prepare RFC and CSG material, the most more can make full use of excavated material, reduce construction costs, significantly reduce the negative shadow to environment
Ring, there is good society, economy and environmental ecological benefit.But the shortcoming of this invention is the rock-fill concrete of dam upstream side
It is to irrigate with self-compacting mortar, is not added with vibrating, unit cement consumption is big, the ratio of mud is big and the high slump, drying shrinkage are easily generated greatly
Structural crack, causes seepage and dam gradually loses water retaining function.
Summary of the invention
Not enough for prior art, the present invention provides 150m～the 300m level high concrete setting up cement sand and gravel structure sheaf
The construction method of rock, described method comprises the steps:
Step one paves and rolls the building stones of main rockfill area, rolls thickness 80cm；
Step 2 construction transition district, bed course district, concrete squeezing sidewall and cement sand and gravel structure sheaf:
The construction of 2.1 decking and rolling Transition Materials, bedding material, concrete squeezing sidewall and laying roll cement sand and gravel material, shape
Becoming lower floor's transition region, bed course district of lower floor, lower-layer concrete extrusion side wall and lower floor's cement sand and gravel structure sheaf, thickness is
40cm；
2.1.1 lime line, to determine lower floor's transition region, bed course district of lower floor, lower-layer concrete extrusion side wall and lower floor's glue
The border of solidifying sand gravel structure sheaf；
2.1.2 pave Transition Materials；
2.1.3 pave bedding material；
2.1.4 construction concrete squeezing sidewall:
The most smooth cement sand and gravel upstream basal plane, smooth for the upstream face making concrete squeezing sidewall, need to be at every layer
End face upstream side width not less than smooth gelling sand gravel material surface in the range of 1.2m, is removed fluctuating wave-like face and is scattered
Aggregate, carries out surveying setting-out, indicates the track route of extruder after leveling；
2.1.4.2 extruder lifting is in place, before abutment wall extruding, extruder is lifted into construction starting point, utilizes levelling rod pair
Extruding fuselage is adjusted, and makes extruder be in level, when extruder lifting is in place, extruder is placed in the straight of advance
Line direction, makes Side fascia overlap with molded abutment wall outer slope, after extruder lifting is in place, lays concrete squeezing sidewall dihedral
Termination baffle plate is also fixed；
2.1.4.3 extruded concrete squeezing sidewall, use concrete tank concrete to transport scene, use retrogressing method past
Extruder charging aperture discharging, accelerator is added to charging aperture with walking limit, extruder limit by the ad hoc additive tank in extruder；
During extruding, speed controlling is at about 50m/h；After abutment wall is extruded, occur that levels connects what obvious faulting of slab ends or abutment wall between slope caved in
Situation, uses concrete of the same race to carry out repairing treatment；
2.1.5 fill cement sand and gravel material, after concrete squeezing sidewall molding 2h, carry out filling of cement sand and gravel material
Roll, use vibrating roller to roll near extrusion side wall region and extrusion side wall with exterior domain；Cement sand and gravel material uses natural
Sandy gravel or excavation rock ballast add labor and materials, particle diameter > 30cm, adds Binder Materials cement and flyash, water, high efficiency water reducing agent, uses liquid
Pressure backhoe turn 6～8 times, mix transports supreme dam the most afterwards, pave, smooth, roll, maintenance；
2.2 construction upper strata transition regions, bed course district, upper strata, upper strata concrete squeezing sidewall and upper strata cement sand and gravel structure
Layer, construction procedure is with 2.1；
The operational procedure repeating step one and step 2 makes dam height rise dam crest, i.e. bulwark Bottom Altitude；
Step 3 concrete squeezing sidewall surface processes and spraying emulsified asphalt:
Concrete squeezing sidewall surface, the 3.1 pairs of dam upstreams discrepancy in elevation measures；
Concrete squeezing sidewall surface irregularity is processed by 3.2, and surface highness change ,+5～-8cm, exceeds portion
Dividing employing pneumatic pick to cut method, low-lying place uses mortar to fill up, and provides a smooth bearing-surface for panel；
3.3 spraying emulsified asphalts, after the domatic trimming of concrete squeezing sidewall, Colophonium spraying machine from top to bottom starts spray
It is coated with emulsified asphalt, on domatic, first spray an emulsified asphalt, second time emulsified asphalt of fill-before-fire after dry, shed sand,
Then injection the 3rd time emulsified asphalt, its face is spilt one layer of sand again, emulsified asphalt be bitumen content be 60% solvent dilute
Release emulsion；
Step 4 construction of concrete face slab:
4.1 chisels disconnected with process concrete squeezing sidewall, along concrete slab vertical lap seam direction by concrete squeezing sidewall
Chisel is disconnected, and the disconnected degree of depth of chisel is not less than 10cm not less than 30cm, seam bottom width degree not less than 6cm, seam width；
4.2 construction vertical lap seam mortar bed, on concrete squeezing sidewall is domatic, determine the position of concrete slab vertical lap seam
Put and the scope of mortar bed, with crooked chisel raggle in the range of described, lay the mortar bed of M20, be beneficial to sealing copper is installed
Sheet and side form；
4.3 construction periphery fissure tar sand lumps, remove the protection facility of toe board sealing piece, lacing wire sand of appearing at periphery fissure
Turbine polishes, and with crooked chisel, crowbar raggle, and repairs molding, buries tar sand cushion block underground, the heat drip of the gap between tar sand cushion block
Blue or green filling is real；
4.4 dozens of bar frame studs, before concrete slab reinforcing bar is installed, array pitch 2.0 between concrete squeezing sidewall surface
～2.5m bores plummet hole bay stud reinforcement placing net；Bearing rod Φ 25mm screw-thread steel, squeezes into concrete squeezing sidewall 40cm,
50% layout in an amount, remaining is made bearing rod spacer bar with stool muscle, and goes out the design of reinforcing bar binding at bearing rod subscript
Position；Along with next step concreting requires progressively to cut off bearing rod, reduce concrete slab and concrete squeezing sidewall
Mutual constraint；
4.5 make and install concrete slab reinforcing bar, the every block concrete slab reinforcement of on-the-spot processing, and joint uses stripping rib rolling
Straightening screw shell connects；Reinforcing bar two ends is processed into screw-type, and with rigid plastics set protection, the reinforcing bar machined by
Require mantle fiber inspection, record, number to list and store up；
Reinforcing bar after machining order reinforcement trolley level by number is transported to store up place, 16～25 tons of vapour temporarily
Car hangs on the domatic chassis that the reinforcing bar processed winches to transport reinforcing bar, is transported to install with 5 tons of hoist engine traction reinforcement trolleys
Work surface, every time 2～3 tons of reinforcing bars of conveying；
4.6 make and install copper water stop, use level Four copper water stop forming machine to be pressed at dam facing operation platform scene
Type, delivers to periphery fissure joint under domatic, and length determines according to the situation of every block concrete panel, the longest the most compressing
140m, copper water stop is connected by two-sided overlap welding, and the lap of splice is no less than 20mm；
4.7 make and install side form:
4.7.1 side form is steel and wood composite structure, is mainly joined plank sheathing by 18 thin-wall channels and forms, a length of 3m-of thin-wall channel
6m, bottom transition is 6cm thickness plank sheathing, every secondary long 3m of template；
4.7.2 side form is carried out after being arranged on vertical lap seam end water installation, and panel side form is installed from bottom to top, in face, storehouse
Domatic dolly is laid in both sides, with 5 tons of hoist engine traction transport side form materials, uses triangular support bracket to fix, triangle outside side form
Bracing frame Φ 20mm long 50cm drill rod is fixed on concrete squeezing sidewall bed course mask, and inner side uses reinforcing bar to support；
4.7.3 after the preliminary installation of side form, adjusting perpendicularity with connecting bolt, the seam between side form is smooth, error-free
Platform phenomenon；
4.8 lay chute, and chute uses trapezoidal shape, often long 2.0 meters of joint, and end sets connection hook, when sliding formwork glides,
Laying on bar-mat reinforcement and segmentation is fixed, chute top uses flexible material to make cover plate, and Polypropylence Sheet or fur-felt are laid in bottom, with
Bar-mat reinforcement separates, and arranges the soft baffle plate of plastics every 20～30m in chute, to prevent aggregate separated and buffering concrete from gliding and rushing
Power, is arranged symmetrically with two road chutes during the wide 16m of panel parting, one chute of intermediate arrangement during 8m width；
4.9 casting concretes, the transport of concrete dump truck is discharged in hopper, by hopper along domatic to dam facing
Chute conveying is put in storage, oscillating chute in storehouse, and by 30～50cm layer-by-layer distributions, storehouse Middle face usesVibrator vibrate,
Near side form and the position of sealing piece, useFlexible shaft vibrator vibrates, and when vibrating, vibrator is along plummet direction before sliding formwork
Downwards, spacing of vibrating is not more than 40cm, and the degree of depth reaches following 5cm bottom newly-laid concrete layer；
4.10 curing concretes, concreting vibrate wipe one's face 3～4 times compacting initial set after, lay layer of plastic film add
Rock wool, by curing at moisture-retention and heat-insulation 14 days, changes afterwards and lays two-layer straw bag, use galvanized wire colligation, installs arm on main-supply road
Water receiving is put down and is sprayed maintenance to floral tube.
Further, the width of cement sand and gravel structure sheaf is 3～5m.
Further, the water-cement ratio of cement sand and gravel structure sheaf is 0.7～1.3.
Further, the Binder Materials of cement sand and gravel structure sheaf is not less than 70kg/m3, wherein cement consumption 50%,
Flyash 50%, natural soft-clay material sand factor is 25～35%, or excavation rock ballast to add labor and materials sand factor be 25～40%.
Further, the reference design workability of the cement sand and gravel grinding coagulation soil mix of cement sand and gravel structure sheaf
Value is 2s～12s.
Further, the thickness 1～2mm of emulsified asphalt in step 3.
Further, the flatness of the mortar bed laying M20 in step 4 control in the scope of 2m length 5mm with
In.
Further, between step 4 medium pitch sand cushion block, flatness controls in the range of 10m, and waviness is less than
20mm。
Further, the Colophonium in tar sand cushion block and sand weight ratio are 1:10.
Compared with prior art, the beneficial effects of the present invention is:
The method of the invention is to set up cement sand and gravel structure sheaf between concrete slab and bedding material, mixes dam
Solidifying soil panel plays secondary and prevents blending the effect of support, improves the harmony of concrete slab and cemented gravel dam deformation,
Capture dam and cause the most pendent technical barrier of concrete slab fall damage because of seepage deformation.
Accompanying drawing explanation
Fig. 1 is the structural representation of 150m～300m level high concrete panel rock-fill dams of the present invention；
Fig. 2 is the upstream process chart of 150m～300m level high concrete panel rock-fill dams of the present invention.
Shown in figure: 1-concrete slab, 2-cement sand and gravel structure sheaf, 21-lower floor cement sand and gravel structure sheaf, 22-
Upper strata cement sand and gravel structure sheaf, 3-bed course district, bed course district of 31-lower floor, bed course district, 32-upper strata, 4-transition region, 41-lower floor mistake
Cross district, 42-upper strata transition region, the main rockfill area of 5-, 6-rockfill area, 7-concrete squeezing sidewall, concrete extrusion limit, 71-upper strata
Wall, 72-lower-layer concrete extrusion side wall.
Detailed description of the invention
In conjunction with Figure of description, the detailed description of the invention of the present invention is described in detail.
As depicted in figs. 1 and 2,150m～the 300m level high concrete face setting up cement sand and gravel structure sheaf of the present invention
The construction method of sheetpile masonry dam, including concrete slab 1, cement sand and gravel structure sheaf 2, bed course district 3, transition region 4, main rockfill area
5 and time rockfill area 6, described method comprises the steps:
Step one paves and rolls the building stones of main rockfill area 5, rolls thickness 80cm；
Step 2 construction transition district, bed course district, concrete squeezing sidewall and cement sand and gravel structure sheaf:
The construction of 2.1 decking and rolling Transition Materials, bedding material, concrete squeezing sidewall and laying roll cement sand and gravel material, with
Form lower floor's transition region 41, bed course district of lower floor 31, lower-layer concrete extrusion side wall 71 and lower floor's cement sand and gravel structure sheaf 21, thick
Degree is 40cm；
2.1.1 lime line, to determine lower floor's transition region 41, bed course district of lower floor 31, lower-layer concrete extrusion side wall 71 and
The border of lower floor's cement sand and gravel structure sheaf 21；
Lower floor's Transition Materials 2.1.2 pave；
Lower floor's bedding material 2.1.3 pave；
2.1.4 construction lower-layer concrete extrusion side wall 71；
The most smooth cement sand and gravel upstream basal plane, smooth for the upstream face making concrete squeezing sidewall 7, need to be often
Layer end face upstream side width, not less than smooth gelling sand gravel material surface in the range of 1.2m, is removed fluctuating wave-like face and is scattered
Aggregate, carry out surveying setting-out after leveling, indicate the track route of extruder；
2.1.4.2 extruder lifting is in place, before concrete squeezing sidewall 7 extruding, extruder is lifted into construction starting point, profit
With levelling rod, extruding fuselage is adjusted, makes extruder be in level, when extruder lifting is in place, extruder is put
In the rectilinear direction advanced, make Side fascia overlap with molded abutment wall outer slope, after extruder lifting is in place, lays concrete and squeeze
Flanging wall 7 dihedral termination baffle plate is also fixed；
The most extruded concrete squeezing sidewall 7, uses concrete tank concrete to transport scene, uses retrogressing method
Toward extruder charging aperture discharging, accelerator is added to charging aperture with walking limit, extruder limit by the ad hoc additive tank in extruder
Add；During extruding, speed controlling is at about 50m/h；After abutment wall is extruded, occur that levels connects obvious faulting of slab ends or abutment wall between slope and collapses
Situation about collapsing, uses concrete of the same race to carry out repairing treatment；
2.1.5 fill cement sand and gravel material, after concrete squeezing sidewall 7 molding 2h, carry out filling out of cement sand and gravel material
Build and roll, use vibrating roller to roll near concrete squeezing sidewall 7 region and concrete squeezing sidewall 7 with exterior domain；Gelling
Sand gravel material uses natural soft-clay material or excavation rock ballast to add labor and materials, particle diameter > 30cm, interpolation Binder Materials cement and flyash, water,
High efficiency water reducing agent, turns 6～8 times with hydraulic hoe, and mix transports supreme dam the most afterwards, pave, smooth, roll, maintenance；
2.2 construction upper strata transition regions 42, bed course district, upper strata 32, upper strata concrete squeezing sidewall 72 and upper strata cement sand and gravel
Structure sheaf, construction procedure is with 2.1；
The operational procedure repeating step one and step 2 makes dam height rise dam crest, i.e. bulwark Bottom Altitude；
Step 3 concrete squeezing sidewall 7 surface processes and spraying emulsified asphalt:
Concrete squeezing sidewall 7 surface, the 3.1 pairs of dam upstreams discrepancy in elevation measures；
Concrete squeezing sidewall 7 surface irregularity is processed by 3.2, and surface highness change ,+5～-8cm, exceeds
Part uses pneumatic pick to cut, and low-lying place uses mortar to fill up, and provides a smooth bearing-surface for panel；
3.3 spraying emulsified asphalts, the thickness 1～2mm of emulsified asphalt, after the domatic trimming of concrete squeezing sidewall 7, drip
Blue or green spraying machine from top to bottom starts to spray emulsified asphalt, first sprays an emulsified asphalt on domatic, fill-before-fire the after dry
Two times emulsified asphalts, shed sand, and then the 3rd time emulsified asphalt of injection, spills one layer of sand on its face again, and emulsified asphalt is
Bitumen content is the solvent dilution emulsion of 60%；
Step 4 construction concrete slab 1:
4.1 chisels disconnected with process concrete squeezing sidewall 7, along concrete slab vertical lap seam direction by concrete squeezing sidewall
7 chisels are disconnected, and the disconnected degree of depth of chisel is not less than 10cm not less than 30cm, seam bottom width degree not less than 6cm, seam width；
4.2 construction vertical lap seam mortar beds, on concrete squeezing sidewall 7 is domatic, determine concrete slab vertical lap seam
Position and the scope of mortar bed, with crooked chisel raggle in the range of described, lay the mortar bed of M20, lay the mortar pad of M20
The flatness requirement of layer controls within 5mm in the scope of 2m length, is beneficial to install copper seal and side form；
4.3 construction periphery fissure tar sand lumps, remove the protection facility of toe board sealing piece, lacing wire sand of appearing at periphery fissure
Turbine polishes, and with crooked chisel, crowbar raggle, and repairs molding, buries tar sand cushion block underground, the heat drip of the gap between tar sand cushion block
Blue or green filling is real, and between tar sand cushion block, flatness controls in the range of 10m, waviness is less than 20mm, the drip in tar sand pad slurry
Blue or green is 1:10 with sand weight ratio；
4.4 dozens of bar frame studs, before concrete slab reinforcing bar is installed, array pitch 2.0 between concrete squeezing sidewall 7 surface
～2.5m bores plummet hole bay stud reinforcement placing net；Bearing rod Φ 25mm screw-thread steel, squeezes in concrete squeezing sidewall 7
40cm, 50% layout in an amount, remaining is made bearing rod spacer bar with stool muscle, and goes out reinforcing bar binding at bearing rod subscript
Design attitude；Along with next step concreting requires progressively to cut off bearing rod, reduce concrete slab 1 and concrete extrusion
The mutual constraint of abutment wall 7；
4.5 make and install concrete slab reinforcing bar, manufacture every block concrete slab reinforcement respectively, and joint uses stripping rib rolling
Straightening screw shell connects, and reinforcing bar two ends is processed into screw-type, and with rigid plastics set protection, the reinforcing bar machined by
Require mantle fiber inspection, record, number to list and store up；Reinforcing bar after machining order reinforcement trolley level by number is transported to
Storing up place, the reinforcing bar processed is winched to transport on the domatic chassis of reinforcing bar, leads with 5 tons of hoist engines by 16～25 tons of truck cranes temporarily
Draw reinforcement trolley and be transported to installment work face, every time 2～3 tons of reinforcing bars of conveying；
4.6 make and install copper water stop, use level Four copper water stop forming machine to be pressed at dam facing operation platform scene
Type, delivers to periphery fissure joint under domatic, and length determines according to the situation of every block concrete panel, the longest the most compressing
140m, copper water stop is connected by two-sided overlap welding, and the lap of splice is no less than 20mm；
4.7 make and install side form:
4.7.1 side form is steel and wood composite structure, is mainly joined plank sheathing by 18 thin-wall channels and forms, and thin-wall channel standard is long
6m, part is 3m, and bottom transition is 6cm thickness plank sheathing, every secondary long 3m of template；
4.7.2 side form is carried out after being arranged on vertical lap seam end water installation, and panel side form is installed from bottom to top, in face, storehouse
Domatic dolly is laid in both sides, with 5 tons of hoist engine traction transport side form materials, uses triangular support bracket to fix, triangle outside side form
Bracing frame Φ 20mm long 50cm drill rod is fixed on concrete squeezing sidewall 7 bed course mask, and inner side uses reinforcing bar to support；
4.7.3 after the preliminary installation of side form, adjusting perpendicularity with connecting bolt, the seam between side form is smooth, error-free
Platform phenomenon；
4.8 lay chute, and chute uses trapezoidal shape, often long 2.0 meters of joint, and end sets connection hook, when sliding formwork glides,
Laying on bar-mat reinforcement and segmentation is fixed, chute top uses flexible material to make cover plate, and Polypropylence Sheet or fur-felt are laid in bottom, with
Bar-mat reinforcement separates, and arranges the soft baffle plate of plastics every 20～30m in chute, to prevent aggregate separated and buffering concrete from gliding and rushing
Power, is arranged symmetrically with two road chutes during the wide 16m of concrete slab parting, one chute of intermediate arrangement during 8m width；
4.9 casting concretes, the transport of concrete dump truck is discharged in hopper, by hopper along domatic to dam facing
Chute conveying is put in storage, oscillating chute in storehouse, and by 30～50cm layer-by-layer distributions, storehouse Middle face usesVibrator vibrate,
Near side form and the position of sealing piece, useFlexible shaft vibrator vibrates, and when vibrating, vibrator is along plummet direction before sliding formwork
Downwards, spacing of vibrating is not more than 40cm, and the degree of depth reaches following 5cm bottom newly-laid concrete layer；
4.10 curing concretes, concreting vibrate wipe one's face 3～4 times compacting initial set after, lay layer of plastic film add
Rock wool, by curing at moisture-retention and heat-insulation 14 days, changes afterwards and lays two-layer straw bag, use galvanized wire colligation, installs arm on main-supply road
Water receiving is put down and is sprayed maintenance to floral tube.
Further, the width of cement sand and gravel structure sheaf is 3～5m.
Further, the water-cement ratio of cement sand and gravel structure sheaf is 0.7～1.3.
Further, the Binder Materials of cement sand and gravel structure sheaf is not less than 70kg/m3, wherein cement consumption 50%,
Flyash 50%, natural soft-clay material sand factor is 25～35%, or excavation rock ballast to add labor and materials sand factor be 25～40%.
Further, the reference design workability of the cement sand and gravel grinding coagulation soil mix of cement sand and gravel structure sheaf
Value is 2s～12s.
Being checked by test and engineering practice, cement sand and gravel grinding coagulation soil intensity is typically in C4～C10, cleavage strength
In 0.4MPa～1.2MPa, infiltration coefficient i × 10-5Cm/s, and the design of the bedding material infiltration coefficient of former CFRD
For i × 10-3Cm/s～i × 10-4Cm/s, improves 10 times of orders of magnitude.By test, nearly 500 days of infiltration corrosion, maximum CaO is molten
Go out rate 3.16%, with Ca2+Dissolution, intensity declines notable, general decline 10%～25%, along with the infiltration corrosion later stage, dissolution
Ca2+Concentration is extremely low, pH value 10-11.5, belongs to low alkalinity, reflects Ca (OH)2Greatly consumed and tended towards stability, to keeping glue
Solidifying gravel rolls the intensity of stone concrete and durability is favourable, illustrate that seepage control of dam is played secondary by cement sand and gravel structure sheaf anti-
It is reliable for oozing with supporting role.
Cemented gravel dam, China is successfully applied to the upstream cofferdam in power station, street corner, Fujian, Ya'an Sichuan province flies Xian Guanshui
The longitudinal cofferdam in power station, Lancang, yunnan Jiang Gongguo bridge power station upstream cofferdam, multiple power stations Temporary Cofferdam such as maximum height of dam 56m
Engineering, Shou Kou fort, Yanggao County, the Datong City, Shanxi Province reservoir dam of China Reconstructs, maximum height of dam 61.4m, the built 107m of Turkey
Cemented gravel dam, normally plays enormous benefits.
The following is several construction embodiments of the concrete application of the cement sand and gravel dam of applicant:
(1) Fujian Hong Kou upstream cofferdam
It is domestic that flood saliva power station is positioned at Ningde Hong Kouxiang, and barrage is Compacted Concrete Gravity Dam Section H=130m.In order to reduce
Around investment, accelerating construction progress, and Dam Site, sand gravel material source enriches, and upstream cofferdam uses cemented gravel dam.
Cofferdam maximum height of weir 35.5m, the weir crest width 4.5m of design, weir body upstream batter 1:0.3, the downstream face gradient is
1:0.75。
Cement sand and gravel dam material binder total amount 70kg/m3-90kg/m3, cement consumption is not less than 35kg/m3.?
Little compacted density presses 2200kg/m3Controlling, 28d comprcssive strength is not less than 4MPa.
From starting construction at the beginning of 2006 2 months, it is completed in by the end of March, 2006 and comes into operation, making cement sand and gravel altogether
31500m3。
(2) Ya'an Sichuan province flies Xian Guan power station one phase longitudinal cofferdam
Ya'an Sichuan province flies a phase longitudinal cofferdam in Xian Guan power station, is designed with meeting low water flood 1460m in 10 years one3/ s,
Longitudinal cofferdam total length about 369m, cofferdam crest level is from 612.0m gradual change to 609.0m, and elevation at the bottom of weir is 600m, maximum height of weir 12m,
Top width 4m, two side slopes are more than C than the strength grade of 1:0.6,28d age4.Its middle and lower reaches 144.3m utilize the rock stalk that open channel excavates
As cofferdam, bottom, top uses rolls cement sand and gravel cofferdam, and residue 224.7m coffered foundation is sand gravel basis, and basis is adopted
Using high pressure phase equilibria antiseepage, this section all uses and rolls cement sand and gravel cofferdam, maximum particle diameter 300mm in construction, and pave thickness
Degree 600mm, about 23580m measures in cement sand and gravel side3。
(3) China's permanent cemented gravel dam of First, i.e. keeps a mouthful fort reservoir dam
Dam body is arranged and Section Design: cemented gravel dam presses dash monolith, Overflow Section, bottom outlet monolith layout, maximum
Height of dam 61.6m, dam crest width 6m, the upstream of dash monolith is 1:0.6 with dam facing slope, downstream ratio, and Overflow Section is open type overflow
Weir, if 6 hole overflow surface bay, every hole clear span 9.0m, downstream uses flip trajectory bucket mode, bottom outlet monolith port size is 4.0 ×
4.8m, import sets emergency overhaul gate, and outlet sets Segmental service gate, under connect trajectory bucket type energy.
Engineering according to the method for the invention construction described above, the most all achieves huge economic benefit and society
Can benefit.
Obviously, the above embodiment of the present invention is only for clearly demonstrating example of the present invention, and is not right
The restriction of embodiments of the present invention, for those of ordinary skill in the field, the most also may be used
To make other changes in different forms, cannot all of embodiment be given exhaustive here, every belong to this
What bright technical scheme was extended out obviously changes or changes the row still in protection scope of the present invention.
Claims (9)
1. set up the construction method of 150m～the 300m level high concrete panel rock-fill dams of cement sand and gravel structure sheaf, described method
Comprise the steps:
Step one paves and rolls the building stones of main rockfill area, rolls thickness 80cm；
Step 2 construction transition district, bed course district, concrete squeezing sidewall and cement sand and gravel structure sheaf:
The construction of 2.1 decking and rolling Transition Materials, bedding material, concrete squeezing sidewall and laying roll cement sand and gravel material, under formation
Floor transition region, bed course district of lower floor, lower-layer concrete extrusion side wall and lower floor's cement sand and gravel structure sheaf, thickness is 40cm；
2.1.1 lime line, to determine lower floor's transition region, bed course district of lower floor, lower-layer concrete extrusion side wall and lower floor's gelling sand
The border of gravel structure sheaf；
2.1.2 pave Transition Materials；
2.1.3 pave bedding material；
2.1.4 construction concrete squeezing sidewall:
The most smooth cement sand and gravel upstream basal plane, leveling gum in the range of every layer of end face upstream side width is not less than 1.2m
Solidifying sand gravel material surface, removes fluctuating wave-like face and the aggregate being scattered, carries out surveying setting-out, indicate extruder after leveling
Track route；
2.1.4.2 extruder lifting is in place, before abutment wall extruding, extruder is lifted into construction starting point, utilizes levelling rod to extruding
Fuselage is adjusted, and makes extruder be in level, when extruder lifting is in place, extruder is placed in the straight line side of advance
To, make Side fascia overlap with molded abutment wall outer slope, after extruder lifting is in place, lay concrete squeezing sidewall dihedral termination
Baffle plate is also fixed；
The most extruded concrete squeezing sidewall, uses concrete tank concrete to transport scene, uses retrogressing method toward extruding
Machine inlet discharging, accelerator is added to charging aperture with walking limit, extruder limit by the ad hoc additive tank in extruder；Extruding
Time speed controlling at about 50m/h；After abutment wall is extruded, occur that levels connects the feelings that between slope, obvious faulting of slab ends or abutment wall cave in
Condition, uses concrete of the same race to carry out repairing treatment；
2.1.5 filling cement sand and gravel material, after concrete squeezing sidewall molding 2h, carry out cement sand and gravel material fills stone roller
Pressure, uses vibrating roller to roll near extrusion side wall region and extrusion side wall with exterior domain；Cement sand and gravel material uses natural sand
Gravel material or excavation rock ballast add labor and materials, particle diameter > 30cm, adding Binder Materials is cement and flyash, and liquid used by water, high efficiency water reducing agent
Pressure backhoe turn 6～8 times, mix transports supreme dam the most afterwards, pave, smooth, roll, maintenance；
2.2 construction upper strata transition regions, bed course district, upper strata, upper strata concrete squeezing sidewall and upper strata cement sand and gravel structure sheaf, execute
Work step is suddenly with 2.1；
The operational procedure repeating step one and step 2 makes dam height rise dam crest, i.e. bulwark Bottom Altitude；
Step 3 concrete squeezing sidewall surface processes and spraying emulsified asphalt:
Concrete squeezing sidewall surface, the 3.1 pairs of dam upstreams discrepancy in elevation measures；
Concrete squeezing sidewall surface irregularity is processed by 3.2, and surface highness change is +5～-8cm, and the raised area is adopted
Cutting with pneumatic pick, low-lying place uses mortar to fill up；
3.3 spraying emulsified asphalts, after the domatic trimming of concrete squeezing sidewall, Colophonium spraying machine from top to bottom starts spraying breast
Change Colophonium, on domatic, first spray an emulsified asphalt, second time emulsified asphalt of fill-before-fire after dry, shed sand, then
Spray the 3rd time emulsified asphalt, its face spilt one layer of sand again, emulsified asphalt be bitumen content be 60% solvent dilution breast
Liquid；
Step 4 construction concrete slab:
4.1 chisels are disconnected and process concrete squeezing sidewall, disconnected being dug by concrete squeezing sidewall along concrete slab vertical lap seam direction,
The disconnected degree of depth of chisel is not less than 10cm not less than 30cm, seam bottom width degree not less than 6cm, seam width；
4.2 construction vertical lap seam mortar beds, on concrete squeezing sidewall is domatic, determine concrete slab vertical lap seam position and
The scope of mortar bed, with crooked chisel raggle in the range of described, lays the mortar bed of M20；
4.3 construction periphery fissure tar sand lumps, remove the protection facility of toe board sealing piece, lacing wire abrasive machine of appearing at periphery fissure
Polishing, with crooked chisel, crowbar raggle, and repair molding, bury tar sand cushion block underground, the gap heated bitumen between tar sand cushion block fills
Real；
4.4 dozens of bar frame studs, install before concrete slab reinforcing bar, between concrete squeezing sidewall surface array pitch 2.0～
2.5m bores plummet hole bay stud reinforcement placing net；Bearing rod Φ 25mm screw-thread steel, squeezes into concrete squeezing sidewall 40cm, presses
50% layout of total amount, remaining is made bearing rod spacer bar with stool muscle, and goes out the design position of reinforcing bar binding at bearing rod subscript
Put；Bearing rod is progressively cut off；
4.5 make and install concrete slab reinforcing bar, the every block concrete slab reinforcement of on-the-spot processing, concrete slab splice
Use peel rolled straight thread sleeve connection；Concrete slab reinforcing bar two ends is processed into screw-type, and uses rigid plastics set
Protection；
Reinforcing bar after machining order reinforcement trolley level by number is transported to store up place, 16～25 tons of truck cranes temporarily
Winch to the reinforcing bar processed transport on the domatic chassis of reinforcing bar, be transported to installment work with 5 tons of hoist engine traction reinforcement trolleys
Face；
4.6 make and install copper water stop, use level Four copper water stop forming machine compressing at dam facing operation platform scene, suitable
Delivering to periphery fissure joint under domatic, the most compressing no more than 140m, copper water stop is connected by two-sided overlap welding, overlap joint
Length is no less than 20mm；
4.7 make and install side form:
4.7.1 concrete slab side form is steel and wood composite structure, 18 thin-wall channels join plank sheathing and form, and thin-wall channel is a length of
3m-6m, bottom transition is 6cm thickness plank sheathing, every secondary long 3m of concrete slab template；
4.7.2 concrete slab side form is carried out after being arranged on vertical lap seam end water installation, and concrete slab side form is installed certainly
Under up, lay domatic dolly in both sides, face, storehouse, transport side form materials, outside concrete slab side form with the traction of 5 tons of hoist engines
Employing triangular support bracket is fixed, and triangular support bracket Φ 20mm long 50cm drill rod is fixed on concrete squeezing sidewall bed course mask
On, inner side uses reinforcing bar to support；
4.7.3, after the preliminary installation of concrete slab side form, perpendicularity is adjusted with connecting bolt, between concrete slab side form
Seam smooth, without faulting of slab ends phenomenon；
4.8 lay chute, and chute uses trapezoidal shape, often long 2.0 meters of joint, and end sets connection hook, when sliding formwork glides, at reinforcing bar
Online laying and segmentation is fixed, chute top uses flexible material to make cover plate, and Polypropylence Sheet or fur-felt are laid in bottom, with reinforcing bar
Net separates, and arranges the soft baffle plate of plastics every 20～30m, be arranged symmetrically with two road chutes, during 8m width during the wide 16m of panel parting in chute
One chute of intermediate arrangement；
4.9 casting concretes, the transport of concrete dump truck is discharged in hopper, by hopper along domatic chute to dam facing
Conveying is put in storage, oscillating chute in storehouse, and by 30～50cm layer-by-layer distributions, storehouse Middle face usesVibrator vibrate, close
Side form and the position of sealing piece, useFlexible shaft vibrator vibrates, and when vibrating, vibrator is downward along plummet direction before sliding formwork,
Spacing of vibrating is not more than 40cm, and the degree of depth reaches following 5cm bottom newly-laid concrete layer；
4.10 curing concretes, concreting vibrate wipe one's face 3～4 times compacting initial set after, lay layer of plastic film add rock wool
By curing at moisture-retention and heat-insulation 14 days, change afterwards and lay two-layer straw bag, use galvanized wire colligation, main-supply road is installed arm water receiving
Put down and spray maintenance to floral tube.
2. according to method described in claim 1, it is characterised in that the width of cement sand and gravel structure sheaf described in step 2 be 3～
5m。
3. according to method described in claim 1, it is characterised in that described in step 2, the water-cement ratio of cement sand and gravel structure sheaf is
0.7～1.3.
4. according to method described in claim 1, it is characterised in that the Binder Materials of cement sand and gravel structure sheaf described in step 2 is not
Less than 70kg/m3, wherein cement consumption 50%, flyash 50%；Natural soft-clay material sand factor is 25～35% or open
Dig rock ballast adding labor and materials sand factor is 25～40%.
5. according to method described in claim 1, it is characterised in that the cement sand and gravel of cement sand and gravel structure sheaf described in step 2
The reference design work angle value of grinding coagulation soil mix is 2s～12s.
6. according to method described in claim 1, it is characterised in that the thickness 1～2mm of emulsified asphalt described in step 3.
7. according to method described in claim 1, it is characterised in that the flatness of the mortar bed laying M20 described in step 4 exists
Control within 5mm in the scope of 2m length.
8. according to method described in claim 1, it is characterised in that described in step 4, between tar sand cushion block, flatness controls
10m is interior, waviness is less than 20mm.
9. according to method described in claim 1, it is characterised in that the Colophonium in tar sand cushion block described in step 4 and sand weight ratio
For 1:10.
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| CN108978594A (en) * | 2018-09-03 | 2018-12-11 | 中国葛洲坝集团第二工程有限公司 | Concrete face rockfill dam separation layer construction method |
| CN109440733A (en) * | 2018-10-09 | 2019-03-08 | 中国水利水电科学研究院 | A kind of cemented gravel dam and its construction technology |
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