CN108570979A - A kind of construction method for building antiseepage composite foundation on dolomite stratigraph - Google Patents

A kind of construction method for building antiseepage composite foundation on dolomite stratigraph Download PDF

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Publication number
CN108570979A
CN108570979A CN201810344159.3A CN201810344159A CN108570979A CN 108570979 A CN108570979 A CN 108570979A CN 201810344159 A CN201810344159 A CN 201810344159A CN 108570979 A CN108570979 A CN 108570979A
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CN
China
Prior art keywords
construction
stake
composite foundation
stabilized macadam
cement stabilized
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CN201810344159.3A
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Chinese (zh)
Inventor
李文超
何卫安
徐隆伟
孙卫星
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China 9th Engineering Bureau Of Water Conservancy & Hydropower
Sinohydro Bureau 9 Co Ltd
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China 9th Engineering Bureau Of Water Conservancy & Hydropower
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Application filed by China 9th Engineering Bureau Of Water Conservancy & Hydropower filed Critical China 9th Engineering Bureau Of Water Conservancy & Hydropower
Priority to CN201810344159.3A priority Critical patent/CN108570979A/en
Publication of CN108570979A publication Critical patent/CN108570979A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/08Improving by compacting by inserting stones or lost bodies, e.g. compaction piles

Abstract

The present invention relates to a kind of on dolomite stratigraph builds the construction method of antiseepage composite foundation, including smooth location, stroke fixed pile, laying construction platform, drilling stake holes, drill bit and simultaneously concrete perfusion, formation pile crown, finishing pile crown, laying mattress layer into stake holes are promoted, mattress layer is made to connect the step of forming antiseepage composite foundation with cement stabilized macadam stake.Technical solution using the present invention, concrete-pile construction technology is applied in construction of hydropower plant, extend the construction technique scope of application, the composite construction formed by cement stabilized macadam stake and mattress layer greatly strengthens the structural strength and bearing capacity of antiseepage composite foundation, effectively prevents composite foundation and deforms, in addition, due to being not required to embedded reinforcing bar in cement stabilized macadam stake, project cost is greatly reduced, construction technology is simplified, saves construction cost.

Description

A kind of construction method for building antiseepage composite foundation on dolomite stratigraph
Technical field
The invention belongs to the realm of building construction more particularly to a kind of constructions for building antiseepage composite foundation on dolomite stratigraph Method.
Background technology
With being continuously increased for high-rise quantity, in old urban area, construction uses well-points dewatering, causes adjacent building, pipe The phenomenon that line, pavement cracking are sunk is commonplace, in order to protect groundwater resources, reduce waste, prevents building dam foundation pit Outer level of ground water, which declines, induces related geological disaster, has built building, pipeline, pavement of road to surrounding and has caused various danger Evil, waterproof are the primary measure of dam foundation pit construction precipitation and the main flow direction of future development from now on, the underground of all trades and professions Exploitation of mineral resources, Underground Space Resource exploitation, municipal works, subway engineering, the underground anti-seepage of hydraulic structure, super large deep water Dam foundation hole etc. engineering be unable to do without sealing, and sealing is built with deep stirring or high-pressure rotary-spray machinery, in recent years, large type drill by In with mobility strong, transition and ground easy for installation advantage, used by large and medium-sized basic engineering construction unit, still, for Certain constructions with multiplexed address condition, building waterproof construction can not be ignored, for example, tieing up prompt Buss with Byelorussia For gram construction of hydropower stations project under construction, the power stations Byelorussia dimension Jie Busike are located at the west of Byelorussia Wei Jiebusikeshi On Dvina, away from dimension Jie Busike city 8km, in the dam construction in the power stations dimension Jie Busike, by the dam dam site institute Place area belongs to the northern branch in the highlands Byelorussia dimension Jie Busike, and landforms belong to West Germany's wiener flood land till plain, till plain Surface is to tilt hummock, and West Germany's wiener flood land landforms are fairly obvious, and hillside fields height difference reaches 49m, and Dam Site surface layer, which is ploughed, plants soil Layer depth about 0.2~0.3m, dam section include on the stratum that depth is 3.3~40m:Modern and ancient lakes alluvial deposits layer is comprehensive Zoarium is on the point of lake ice glacial drift sedimentary, is on the point of lake layer position ice water and lake glacial deposit layer, glacial drift sedimentary, ice water and lake Glacial deposit layer synthesis is moored, Devonian system dolomite contains a large amount of sandy gravel, dolomite crushed zone, geological conditions under earth's surface Sufficiently complex, Hydropower station pivotal area builds ground substantially based on fertile soil, sandy loam, Extra-fine sand, blocky loam, and underground is held It presses water abundant, can not meet building to ground requirement for bearing capacity, in this case, in order to ensure the construction matter of dam Amount, dam foundation pit have the characteristics that depth is deep, area is big, how to build to meet under the geological conditions of this complexity and effectively prevent Water is that necessary condition is created in the dry work of ground, is the key that Hydropower station pivotal area is built.
Invention content
The construction of antiseepage composite foundation is built in order to solve the above technical problems, the present invention provides a kind of on dolomite stratigraph Method.
The present invention is achieved by the following technical programs.
The present invention provides a kind of construction method for building antiseepage composite foundation on dolomite stratigraph, includes mainly following step Suddenly:
Step 1:Smooth location:The closed region in somewhere is selected on the ground as construction site, is removed in construction site All vegetation keep construction site smooth using road roller roller compaction construction place;
Step 2:Draw fixed pile:Required according to construction drawing, in the smooth good construction site described in step 1, with Several positions delimited at construction drawing opposite position, and each position is sequentially numbered and is marked;
Step 3:Laying construction platform:It is laid with an operation platform on construction ground, keeps personnel, equipment and tool logical It crosses the operation platform and is movable to any one position;
Step 4:Creep into stake holes:Along operation platform will on drilling-machine shifter to one of stake position, adjust drilling machine tower body and Drill bit makes drill bit of drilling machine earthward creep into after keeping it perpendicular with ground at stake position, obtains the stake holes that depth is H;
Step 5:Promote drill bit:Drill bit is proposed with constant promotion speed in the stake holes described in step 4, meanwhile, During drill bit is promoted, to concrete perfusion between the drill bit outer surface and the stake holes inner wall, drill bit is proposed completely Afterwards, after concrete setting, cement stabilized macadam stake is obtained in the stake holes;
Step 6:By operation platform by drilling-machine shifter to next position, step 4 is repeated to step 5, successively every Cement stabilized macadam stake is obtained on a position;
Step 7:Form pile crown:After all cement stabilized macadam stakes are made 14 days, dug using engineering machinery broken according to all cement Soil between stone mar, Demolition Construction platform make all cement stabilized macadam stakes be partially exposed to ground pile crown formed above;
Step 8:Modify pile crown:All pile crowns are cleared up and modified using electric pick or concrete cutting machine, remove institute There is the soil and impurity adhered on pile crown, keeps all pile crowns identical relative to ground level;
Step 7:It is laid with mattress layer:It is laid with mattress layer between the pile crown, in compacting mattress layer, makes mattress layer and institute Cement stabilized macadam is stated to connect to form antiseepage composite foundation.
The cement stabilized macadam stake outer diameter is not less than 600mm.
It is in quincuncial arrangement that the stake position is interior on construction ground, and two stake position centre-to-centre spacing of arbitrary neighborhood are less than 2m.
Earthward rate of penetration is 1m/min to 1.5m/min to drill bit of drilling machine described in step 4.
It is 2.5m/min that drill bit described in step 5, which promotes speed,.
Concrete described in step 5 is using cement, sand, rubble, water and additive according to 270:780:1170:180: 1.7 quality proportioning is mixed and stirred.
The operation platform be by be layed in successively on ground dry clay layer, dolomite metalling is after road roller is compacted It is formed.
Sand gravel of the mattress layer by maximum particle size less than 3cm forms.
The beneficial effects of the present invention are:Concrete-pile construction technology is applied to water by technical solution using the present invention During electrical engineering is built, the antiseepage composite foundation that construction method of the present invention is built may be not only suitable for Dam, can also fit The foundation constructions operations such as sluice, workshop, clipping room for power station periphery, by soft, fragmentary dolomite stratigraph It arranges more cement stabilized macadam stakes, then makes cement stabilized macadam stake be combined as a whole to be formed with mattress layer by being laid with mattress layer between stake Composite construction ground, greatly strengthens the structural strength and bearing capacity of ground, and no matter load action is then in cement stabilized macadam stake Or it can ensure that cement stabilized macadam stake, mattress layer participate in work always in composite foundation on soil between cement stabilized macadam stake, due to The intensity and elasticity modulus of cement stabilized macadam stake pile body are larger, and under the action of load, cement stabilized macadam stake top stress compares water Soil surface stress is big between mud broken stone pile, and cement stabilized macadam stake is made to transmit load force into deep soil, to reduce cement The bearing load of soil between broken stone pile, effectively prevents composite foundation and deforms, further, since being not required to bury in cement stabilized macadam stake If reinforcing bar greatly reduces project cost, construction technology is simplified, saves construction cost.
Description of the drawings
Fig. 1 is construction flow chart of the present invention;
Fig. 2 is the schematic diagram that the present invention arranges guide rod on stake position;
Fig. 3 is antiseepage composite foundation cross section structure schematic diagram of the present invention;
Fig. 4 is stake position of the present invention interior arrangement schematic diagram on construction ground.
In figure:1- positions, 2- guide rods, 3- mattress layers, 4- cement stabilized macadam stakes.
Specific implementation mode
Be described further below technical scheme of the present invention, but claimed range be not limited to it is described.
As shown in Figure 1, the present invention provide it is a kind of on dolomite stratigraph build antiseepage composite foundation construction method, including with Lower step:
Step 1:Smooth location:The closed region in somewhere is selected on the ground as construction site, is removed in construction site All vegetation keep construction site smooth using road roller roller compaction construction place;Further, in the construction process, it also to reserve Drainage grade carries out the measures such as gutter, road roller is used in combination to roll original ground, to meet long-spiral drilling machine dead weight and antidumping Requirement.
Step 2:Draw fixed pile:Required according to construction drawing, in the smooth good construction site described in step 1, with Several positions delimited at construction drawing opposite position, and each position is sequentially numbered and is marked;The stake position exists It is in quincuncial arrangement in construction site, two stake position centre-to-centre spacing of arbitrary neighborhood are less than 2m.Further, the step of described stroke of fixed pile Rapid further includes using each position center as rotation center, and circumference array mode is pressed equably in adjacent position around each position Erect 4 guide rods of arrangement.The guide rod is made using timber.As shown in Figure 2, Figure 4 shows, 4 guide rods form 4 crosses and hand over Qualifying point is pitched, stake position is checked to examine at any time, using guide rod made of timber as label, is buried convenient for stake position It is easy-to-look-up afterwards.
Step 3:Laying construction platform:It is laid with an operation platform on construction ground, keeps personnel, equipment and tool logical It crosses the operation platform and is movable to any one position;The operation platform be by be layed in successively on ground dry clay layer, Dolomite metalling is formed after road roller is compacted.The dry clay layer thickness is 50cm.The dolomite fractured-rock layer thickness is 100cm to 150cm.Since ground present position underground water is relatively more, drilling machine cannot be introduced into, and be applied therefore, it is necessary to be provided for drilling machine Work platform, the levelling compacting of operation platform are the key that ensure drilling machine verticality.
Step 4:Creep into stake holes:Along operation platform will on drilling-machine shifter to one of stake position, adjust drilling machine tower body and Drill bit makes drill bit of drilling machine earthward creep into after keeping it perpendicular with ground at stake position, obtains the stake holes that depth is H;Further Ground, the drilling machine are KLB-26, KLB-23 hydraulic walking long-spiral drilling machine.Earthward rate of penetration is the drill bit of drilling machine 1m/min to 1.5m/min.In addition, drilling rod perpendicular alignmnet stake position center should be made before applying brill, it is ensured that pile verticality allowable deviation is not More than 1%, stake position allowable deviation is not more than 5cm.It has to check for whether drill bit valve is closed before spudding in, opening is forbidden to creep into, bore Head diameter control is in 600mm between 620mm, and when lower mobile drilling rod touches ground to drill bit, starter motor is crept into, running speed Slow, rate of penetration is 1.0~1.5m/min or is determined according to test pile, can reduce drilling rod in this way and rock and bore The deviation in hole, to correct in time.First slow rear fast principle is followed when such as finding that drilling rod rocks or hardly possible is bored, to answer in pore forming process Slow down drilling depth, otherwise relatively easily lead to stake holes deflection, displacement, or even makes drilling rod, drilling tool damage.Drill bit reaches designing pile length and calibrates in advance Gao Shi makees eye-catching label at the corresponding drilling machine tower body in power head bottom surface stop place, control stake long foundation when as construction. In pore forming process, drilling rod generally must not be inverted and be promoted, drilling rod should be promoted to ground if you need to promote drilling rod or reversion, to apex point Opening door must clean, debugs, seal again.When having a common boundary into soft or hard layer, it should ensure that drilling rod is vertical, slowly enter, containing brick When block, miscellaneous fill layer or the larger soft plasticity soil layer drilling of water content, drilling rod shaking should be reduced to the greatest extent, in order to avoid varying aperture is different Often, curent change state is paid attention to when drilling, when current value surmounts operating instruction, should promote casting in time, until curent change is The earthwork around drilling rod when being drilled into designed elevation, should should be removed clean, drilling process by normal condition, the soil drilled out with boring with clear In should drilling rod verticality check at any time, it is ensured that drilling rod is vertical, and performs record.
Step 5:Promote drill bit:Drill bit is proposed with constant promotion speed in the stake holes described in step 4, meanwhile, During drill bit is promoted, to concrete perfusion between the drill bit outer surface and the stake holes inner wall, drill bit is proposed completely Afterwards, after concrete setting, cement stabilized macadam stake is obtained in the stake holes;Further, the cement stabilized macadam stake outer diameter is not small In 600mm.The cement stabilized macadam pile length is not less than 11 meters.It is 2.5m/min that the drill bit, which promotes speed,.The concrete is Using cement, sand, rubble, water and additive according to 270:780:1170:180:1.7 quality proportioning is mixed and stirred.Concrete It should be formed through mix mixing in strict accordance with the quality mixture ratio, the parameter that the slump, duration of mixing should be determined by test process It is controlled, and must not be less than 1 minute;The concrete of stirring must assure that concrete cylindrical physical efficiency passes through rigid pipe, height Strong flexible pipe, bend pipe and reducer pipe and reach in drilling rod core pipe.
In addition, further, discharge port is opened after pore-forming to projected depth, it is 180 to be then pressed into the slump prepared ~220mm concrete, then carries brill in Ya Guan.Guncreting carry drilling speed degree by stake diameter, ash-transmission system length of pipeline, Once defeated ash quantity pouring into height, for the determination of the factors such as grey speed in hole for internal diameter size, separate unit blender.Pressure is filled and is carried with drilling rod Rise cooperation quality whether, seriously affect the quality of stake, if drilling rod promoted evening valve will be caused to be difficult to open, cause to be pumped it is excessive, Sebific duct is suppressed brokenly, if drilling rod is promoted soon, will make to generate negative pressure in hole, quicksand pours in the bearing capacity for generating sediment and weakening stake, therefore It is required that pressure is filled wants just right with the cooperation promoted.The general speed that promoted is that 2m/min or live test piles determine.
Pressure must be carried out continuously when filling, and have certain coagulation unit weight of soil, coagulation unit weight of soil to be higher by feed inlet in pump bucket 40cm or more should notify drilling machine to stop being promoted by whistle immediately to prevent inspiration air when pumping hole concrete is less than feed inlet Drilling rod carries out pressure filling again when concrete is stirred.During pressing filling, 1~2m sections of bottom hole carries drilling speed degree and slows down, and stage casing can be fast A bit, top 3m slows down.Until reaching designed elevation, and stops pressure beyond designed elevation 1.0m and fill.Pressure calculates concrete before filling and uses It measures, is checked after pile and be not less than 1.0 per fullness coefficient.
Step 6:By operation platform by drilling-machine shifter to next position, step 4 is repeated to step 5, successively every Cement stabilized macadam stake is obtained on a position;Drilling sequences can be carried out according to the sequence of stake bit number before, can also be used laterally from Wire center is promoted to both sides sequential lateral, longitudinal to be longitudinally propelling from works or separation along line direction.In weak soil, it is It prevents adjacent stake to be squeezed broken or necking down, land upheaval is easily caused in cohesive soil, by field test, pile driving construction is jumped using interval and beaten Method, but new pile of constructing is no less than 7 days with time interval of having driven piles.
Step 7:Form pile crown:After all cement stabilized macadam stakes are made 14 days, dug using engineering machinery broken according to all cement Soil between stone mar, Demolition Construction platform make all cement stabilized macadam stakes be partially exposed to ground pile crown formed above;
Step 8:Modify pile crown:All pile crowns are cleared up and modified using electric pick or concrete cutting machine, remove institute There is the soil and impurity adhered on pile crown, keeps all pile crowns identical relative to ground level;Further place, modifies the step of pile crown Rapid further includes the soil cleared up using backhoe CAT excavators between the pile crown.When modifying pile crown, 0.1m3 small size backs are preferably used It shovels CAT excavators and clears up cement stabilized macadam inter-pile soil earth, cement stabilized macadam inter-pile soil earth and broken pile crown concrete residue are cleaned out Construction site region reduces the disturbance to cement stabilized macadam stake to the greatest extent, uses 1m3 large size backhoe CAT excavators cooperation 20t again later certainly Automobile is unloaded to transport cement stabilized macadam inter-pile soil earth to specified cinder field.
Step 7:It is laid with mattress layer:As shown in figure 3, being laid with mattress layer between the pile crown, in compacting mattress layer, make Mattress layer connect to form antiseepage composite foundation with the cement stabilized macadam.The mattress layer is less than the sand gravel of 3cm by maximum particle size Composition.The mattress layer thickness is 30cm.
Concrete-pile construction technology is applied in construction of hydropower plant by technical solution using the present invention, and the present invention applies The antiseepage composite foundation that work method is built may be not only suitable for Dam, could be applicable to the flood discharge on power station periphery The foundation constructions operation such as lock, workshop, clipping room, by arranging more cement stabilized macadam stakes on soft, fragmentary dolomite stratigraph, then By being laid with mattress layer between stake, makes cement stabilized macadam stake be combined as a whole to form composite construction ground with mattress layer, greatly enhance The structural strength and bearing capacity of ground, no matter load action then soil in cement stabilized macadam stake or between cement stabilized macadam stake On, it can ensure that cement stabilized macadam stake, mattress layer participate in work always in composite foundation, due to the intensity of cement stabilized macadam stake pile body Larger with elasticity modulus, under the action of load, cement stabilized macadam stake top stress is answered compared to cement stabilized macadam inter-pile soil earth surface Power is big, and cement stabilized macadam stake is made to transmit load force into deep soil, to which the carrying for reducing cement stabilized macadam inter-pile soil earth is negative Lotus effectively prevents composite foundation and deforms, further, since being not required to embedded reinforcing bar in cement stabilized macadam stake, greatly reduces work Journey cost, simplifies construction technology, saves construction cost.

Claims (8)

1. a kind of construction method for building antiseepage composite foundation on dolomite stratigraph, it is characterised in that:Include the following steps:
Step 1:Smooth location:The closed region in somewhere is selected on the ground as construction site, removes in construction site and owns Vegetation keeps construction site smooth using road roller roller compaction construction place;
Step 2:Draw fixed pile:Required according to construction drawing, in the smooth good construction site described in step 1, with construction Several positions delimited at drawing opposite position, and each position is sequentially numbered and is marked;
Step 3:Laying construction platform:It is laid with an operation platform on construction ground, personnel, equipment and tool is made to pass through this Operation platform is movable to any one position;
Step 4:Creep into stake holes:Along operation platform by drilling-machine shifter to one of stake position, drilling machine tower body and brill are adjusted Head makes drill bit of drilling machine earthward creep into after keeping it perpendicular with ground at stake position, obtains the stake holes that depth is H;
Step 5:Promote drill bit:Drill bit is proposed with constant promotion speed in the stake holes described in step 4, meanwhile, in drill bit During promotion, waited for after proposing drill bit completely to concrete perfusion between the drill bit outer surface and the stake holes inner wall After concrete setting, cement stabilized macadam stake is obtained in the stake holes;
Step 6:By operation platform by drilling-machine shifter to next position, step 4 is repeated to step 5, successively in each stake Cement stabilized macadam stake is obtained on position;
Step 7:Form pile crown:After all cement stabilized macadam stakes are made 14 days, dug according to all cement stabilized macadam stakes using engineering machinery Between soil, Demolition Construction platform makes all cement stabilized macadam stakes be partially exposed to ground pile crown formed above;
Step 8:Modify pile crown:All pile crowns are cleared up and modified using electric pick or concrete cutting machine, remove all piles The soil and impurity adhered on head, keeps all pile crowns identical relative to ground level;
Step 7:It is laid with mattress layer:It is laid with mattress layer between the pile crown, in compacting mattress layer, makes mattress layer and the water Mud rubble connects to form antiseepage composite foundation.
2. the construction method of antiseepage composite foundation is built on dolomite stratigraph as described in claim 1, it is characterised in that:It is described Cement stabilized macadam stake outer diameter is not less than 600mm.
3. the construction method of antiseepage composite foundation is built on dolomite stratigraph as described in claim 1, it is characterised in that:It is described It is in quincuncial arrangement that stake position is interior on construction ground, and two stake position centre-to-centre spacing of arbitrary neighborhood are less than 2m.
4. the construction method of antiseepage composite foundation is built on dolomite stratigraph as described in claim 1, it is characterised in that:Step Earthward rate of penetration is 1m/min to 1.5m/min to drill bit of drilling machine described in four.
5. the construction method of antiseepage composite foundation is built on dolomite stratigraph as described in claim 1, it is characterised in that:Step It is 2.5m/min that drill bit described in five, which promotes speed,.
6. the construction method of antiseepage composite foundation is built on dolomite stratigraph as described in claim 1, it is characterised in that:Step Concrete described in five is using cement, sand, rubble, water and additive according to 270:780:1170:180:1.7 quality proportioning It mixes and stirs.
7. the construction method of antiseepage composite foundation is built on dolomite stratigraph as claimed in claim 3, it is characterised in that:It is described Operation platform is formed after road roller is compacted by dry clay layer, the dolomite metalling being layed in successively on ground.
8. the construction method of antiseepage composite foundation is built on dolomite stratigraph as claimed in claim 8, it is characterised in that:It is described Sand gravel of the mattress layer by maximum particle size less than 3cm forms.
CN201810344159.3A 2018-04-17 2018-04-17 A kind of construction method for building antiseepage composite foundation on dolomite stratigraph Pending CN108570979A (en)

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CN112982427A (en) * 2021-03-22 2021-06-18 云南建投第一勘察设计有限公司 Reinforcement construction method for foundation pit dangerous case in soft soil area

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Application publication date: 20180925