CN102268871B - Construction method of turnover platform for underwater pile foundation of bridge - Google Patents
Construction method of turnover platform for underwater pile foundation of bridge Download PDFInfo
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Abstract
The invention relates to a construction method of a turnover platform for an underwater pile foundation of a bridge. The construction method comprises the steps of: piling and constructing movable supporting legs of the turnover platform; mounting the turnover platform; erecting a trestle; embedding a steel casing; surveying and staking; drilling a hole; finishing hole drilling and withdrawing a drill; hoisting and laying a steel reinforcement cage; pouring concrete under the water; pouring concrete continuously; and processing slurry; detecting the pile foundation, etc. By adopting the technical scheme disclosed by the invention, a higher bearing capacity required on the platform can be achieved by selecting and regulating the diameter and the sunken depth of a steel pipe pile, and thus the pile has higher adaptability. The construction method disclosed by the invention has the advantages of material saving performance, low cost, simplicity and convenience for construction, high working efficiency, and easiness for guarantee of construction quality.
Description
Technical field
The invention belongs to drilling construction operation waterborne, relate in particular to a kind of construction method of turnover platform for underwater pile foundation of bridge.
Background technology
At present, bored pile foundation has become the main foundation pattern in bridge water, is also the Focal point and difficult point in bridge construction.In water, the key of drilled pile construction is drilling construction job platform waterborne; Its main job practices has: boring method, steel sheet-pile cofferdam method, transportation by driving steel caisson method, trestle and underwater fixed platform method etc. on ship.
Pu, Hangzhoupro (Hangzhou) (PVG) Highway Jiaxing Section 11 contract section are object of construction production that my company accepted construction in recent years.This project is positioned at China southeastern coastal areas, be state key highway construction planning a vertical highway--Jiayin of Heilongjiang, China is to the important component part of Nan Ping, Fujian line, also that Zhejiang Province's highway communication is focused the consruction on planned project, totally-enclosed, full-overpass by two-way six-lane, as to control access speedway standard, designed driving speed is 120Km/h.
Shipping navigation channel, Yan Jia pool master's bridge wherein, is crossed in bridge leap planning III level navigation channel, the controlled engineering Yan Jia of this bid section pool--shipping navigation channel, the Yan Jia pool, is the prestressed concrete continuous beam bridge; Adopt two half range separate type.
This bridge master bridge substructure 20
#, 21
#Main pier all is arranged in shipping navigation channel, Yan Jia pool river, is the reinforced concrete rectangular pier, quadruple board platform rank cushion cap form.Main pier adopts bored pile foundation, distributes in single cushion cap
12 of pile foundations; Along bridge to being divided into three rows, four of every rows, array pitch and pile spacing are 4.2m, totally 48, the long 87m of stake left and right.
According to the Yan Jia pool Bridge Main Pier position, depth of water situation in the water of navigation channel, conventional trestle and the fixed platform method of employing holed, pouring construction, needs to use a large amount of construction steel; And after platform is removed, most construction steel will leave unused useless, and waste is large, and construction cost is high.
Summary of the invention
The purpose of this invention is to provide a kind of high-quality, high efficiency, Bored Pile Foundation construction, i.e. construction method of turnover platform for underwater pile foundation of bridge in water cheaply.
The present invention is by the following technical solutions in order to achieve the above object:
Construction method of turnover platform for underwater pile foundation of bridge comprises the following steps:
The construction of a Turnoverplatform movable supporting legs inserted to play, during inserted to play, at first station keeping ship casts anchor and is positioned at design attitude, hangs ship and moves to the side by the location of casting anchor, and the station keeping ship position error is not more than 20m; Determine the stake position, four angles of platform; Utilize exciting hammer seaming lifting Φ 63 location steel pile tubes, at four jiaos of platform, respectively sink to a steel pipe pile and locate; Lay the guiding girder steel on the location steel pile tube; Utilize the guiding girder steel to locate, by root inserted to play steel pipe pile, until all; The steel pipe pile inserted to play requires the maximum off normal of level less than 15cm, and gradient is less than 1%;
B installs Turnoverplatform, and in movable type water, Turnoverplatform is transported to main pier pier position, and after completing inserted to play steel pipe pile movable supporting legs, the lifting Turnoverplatform is arranged on the steel pipe pile movable supporting legs;
The c trestle is set up, and the wide 4.5m that establishes of bridge adopts the long Φ 20cm of 8m timber to make bearing column; Timber row spacing 3m, two of every rows, spacing 3m; Single pile buries, and laterally girder adopts the I400 i iron, and crossbeam and timber use the palladium nail fixing; Longeron adopts 3 I200 * 100 i iron, and surface layer is laterally laid the 5cm plank;
D steel casing is buried underground, at first, on platform, setting-out is measured in the drilled pile position; Utilize longitudinal and transverse steel I-beam installation guide frame on drilling platform, leading truck is than the large 5cm of casing external diameter; Steel casing welded top is well for beating; Use is hung ship and is coordinated the DZ-60KW vibrating hammer, utilizes exciting hammer seaming hoisting steel casing, the steel casing is transferred, until its sword underfooting sinks to the riverbed face; After proofreading and correct casing verticality (less than 0.5%) and casing plan-position deviation (less than 3cm); In this process, carry out whole process supervision with total powerstation and transit, with preventing offsetting, inclination, control its value and meet code requirement;
E measures setting-out, adopts the GTS-602 total powerstation to establish the station during construction lofting on the control point, makes center and main axis or auxiliary construction baseline with the polar coordinates method, then according to axis or construction baseline, adopts J2B transit cooperation invar tape measuring stake position; More than the axial line control stake need be left works area 10m, the sample stake was long with 60cm
Reinforcing bar is demarcated on the spot, and reinforcing bar exposes 5～8cm, and red paint is coated in the termination;
The f drilling construction when adopting convolution rig positive-circulation drilling, is guaranteed into hole perpendicularity, water surface absolute altitude in retaining hole;
G carries brill in whole hole
The h reinforcing cage hangs, and reinforcing cage is transported to position, hole place by pontoon, utilizes that rig or crane merogenesis lift by crane, lay, each section reinforcing cage is welded in the aperture; Reinforcing cage is sling and is moved to the aperture, and the reinforcing cage after normotopia is hung in the hole; When the skeleton hand-hole, remove earth and foreign material on cage of reinforcement, repair the stirrup of distortion or displacement; Before welding, wring with steel bar wrench, spot welding makes two main muscle closely connected, carries out vertical position welding; During the reinforcing cage welding, up and down two joints must guarantee on same vertical curve, main muscle overlap joint employing one side welding, fusion length 〉=10d (d is bar diameter); After steel bar welding access node bundle, forbid the reinforcing bar welding section is transferred hand-hole at once, prevent that reinforcing bar from quenching;
I underwater concrete perfusion, after reinforcing cage is transferred and is completed, i.e. catheter placement; Select Dg250 snap joint steel pipe during pouring underwater concrete, utilize the stake machine to transfer section by section; Reinforcement cage skeleton and conduit in place after, before pouring underwater concrete, use the anti-secondary pile hole cleaning that loops; First batch of concrete should first be mixed 0.5m
3The same label mortar of left and right; During perfusion, mortar will be before concrete, prevents that conduit mouth from being blocked by aggregate; The volume of storage bin(hopper) will be equal to or greater than first batch of volume of concrete;
The perfusion of j continuous concrete, in measured hole and the height of conduit inner concrete face, the length according to conduit in the hole is controlled at buried depth between 2.0～6.0m; During perfusion, mud is continuously outside tap hole; In filling process, guarantee has enough head height in the hole, and in perfusion, the concrete of forbidding to be scattered falls in the hole, avoids increasing the beds of precipitation thickness on concrete surface and increases the pressure of conduit lower end, brings unnecessary difficulty to concrete perfusion; Pour into complete after, slowly promote the final section conduit, when promoting conduit, should avoid conduit to tilt or the scratching reinforcing cage;
The k mud conditioning;
The l pile foundation detects.
In described water, the transitional drilling platform platform mainly is comprised of truss platform, fixed supporting leg, inserted to play supporting leg; The truss platform planar dimension is 9m * 13.5m, is welded into by I40b shaped steel, and the 2I40 steel I-beam is spelled in weldering, and direction across bridge is arranged on the fixed supporting leg steel pipe top and cuts in advance in notch, and firm welding is as the load-bearing joist.To welded and installed I40 i iron, the top completely spreads δ=5cm plank along bridge on its top, forms the main couple platform; Φ 630mm (δ=steel-pipe welding 10mm) on main couple as fixed supporting leg; The middle channel-section steel that uses carries out the scissors connection.
It is that the A3 steel plate of δ=8mm rolls and forms that the steel casing adopts thickness; Casing is shaped pedestal is set, and adopts the locator spreading, guarantees that reel is round, seam is tight; The groove double welding is adopted in welding, and all weld seams must be continuous, and are water-tight to guarantee; The steel casing carries out merogenesis in processing factory to be made, and is transported to drilling platform, the Site Welding spreading; Be to strengthen the integral rigidity of casing, add the steel band of the wide 20cm of thick 8mm at the welding point weldering place of meeting, casing footing place adds the steel band of the wide 30cm of thick 12mm as the sword pin.
The reinforcement cage skeleton merogenesis is made, every joint length 9～10m; Reinforcing cage is adding man-hour, and the colligation moulding; The reinforcing rib point is welded on main muscle, guarantees reinforcement cage skeleton rigidity, and available cross prevents distortion with the reinforcing cage temporary supporting; After the spiral stirrup straightening, colligation is on main muscle equably, and every joint reinforcing cage stirrup point is welded on main muscle; Main muscle joint can not surpass 50% in same cross section, the lap position 1m that must stagger; Steel bar cage protecting layer is made round pie with mortar in advance, and the centre stays a hole can wear reinforcing bar; After reinforcement cage skeleton is made, the concrete protective piece is through on stirrup, same cross section arranges four, vertically is staggeredly arranged; During install reinforcing cage, the scene arranges many electric welding machines and welds simultaneously, to shorten the install reinforcing cage time.
Before concrete perfusion, reply water proof bolt checks comprehensively; The scope of examination has: ball formula water proof bolt is apart from whether starching surperficial height in the 30cm left and right; Whether nimblely cross ball; Whether the iron wire fixed end is firm; Whether wire installation is stable.
Before filling concrete is complete, increases the measurement number of times of filling concrete height, and prevent because carrying the too fast folder mud that causes of pipe; Perfusion latter stage, conduit inner concrete pressure reduces, and be to guarantee the pile crown quality, conduit and funnel should be improved, and makes that conduit is suitable for reading exceeds the water surface 4～6m in stake top or casing; Pour into latter stage, mud is denseer, often carries a large amount of clods secretly, guarantee the super filling height of 50cm, guarantees the pile crown quality.
Adopt above technical scheme, by selection and the adjusting to steel pipe pile stake footpath and sinkage, can implementation platform on required larger bearing capacity, and then have stronger compliance.Material economy, cost are low.Pile foundation construction after a campshed base construction is completed, is extracted first row from a side direction opposite side construction of a clump of piles, and inserted to play realizes that the 3rd row the turnover of steel pipe pile is used, and has so just greatly saved the steel pipe use amount, has reduced construction cost.Easy construction, work efficiency be high, be easy to guarantee construction quality.
The specific embodiment
Embodiment
1 moves the Turnoverplatform structure design
1) transitional drilling platform
In design employing water, the transitional drilling platform platform mainly is comprised of truss platform, fixed supporting leg, inserted to play supporting leg.The truss platform planar dimension is 9m * 13.5m, is welded into by I40b shaped steel.The 2I40 steel I-beam is spelled in weldering, and direction across bridge is arranged on the fixed supporting leg steel pipe top and cuts in advance in notch, and firm welding is as the load-bearing joist.To welded and installed I40 i iron, the top completely spreads δ=5cm plank along bridge on its top, forms the main couple platform.Φ 630mm (δ=steel-pipe welding 10mm) on main couple as fixed supporting leg.The middle channel-section steel that uses carries out the scissors connection.
2) movable supporting legs
Main bridge master pier construction must be used Φ 500mm, and (δ=10mm) steel pipe is made movable supporting legs, considers the repeatedly utilization of material, adopts the Φ 500mm steel pipe pile of length 12.0m to make supporting upright post; Each turnover, to laying steel pipe pile 4 rows, direction across bridge sets 2 of steel pipe piles to platform, uses altogether 8 steel pipe piles along bridge.Be just in time the flood season during pile foundation construction, Platform pipe stake movable supporting legs top mark is high all should be exceeded navigable water stage 0.5m and be advisable.According to data, the frictional resistance that Φ 500mm steel pipe pile is imbedded in muddy soft soil is very little, at 2t/m
2The left and right.The long 12.0m of every pile estimates to be buried in the earth 8.68m, frictional resistance area 13.63m
2Consider that safety factor is 0.75, count every pile bearing capacity 20.4t left and right (not considering end bearing capacity of pile); The total bearing capacity of Turnoverplatform is at 8 * 20.4=163.2t.Put 2 bench drill machine work in water on Turnoverplatform, every bench drill machine is 25t (comprising drilling rod, drill bit) heavily approximately, and gross weight is 50t approximately; Consider the impact of working load, underwater concrete perfusion many factors, all can satisfy construction requirement.
2 drilling platforms, trestle erection construction
1) Turnoverplatform movable supporting legs inserted to play construction
The steel pipe pile inserted to play utilizes station keeping ship, 40t to hang ship and DZ-60KW seaming exciting hammer carries out under the monitoring of measuring.Before construction, at first go out coordinate and the intersection angle of four jiaos of guide piles of drilling platform according to stake position coordinate Calculation, for piling.During piling, a total powerstation observation location is set in the bank front, the side arranges two transits and checks.
During inserted to play, at first station keeping ship casts anchor Primary Location at design attitude, hangs ship and moves to the side by the location of casting anchor, and the station keeping ship position error is not more than 20m.Under measuring apparatus is accurately controlled on the coast, determine the stake position, four angles of platform; Utilize exciting hammer seaming lifting Φ 63 location steel pile tubes, at four jiaos of platform, respectively sink to a steel pipe pile and locate.Lay the guiding girder steel according to design attitude on the location steel pile tube.Utilize the guiding girder steel to locate, by root inserted to play steel pipe pile, until all.
The steel pipe pile inserted to play requires the maximum off normal of level less than 15cm, and gradient is less than 1%.
2) Turnoverplatform is installed
After in movable type water, Turnoverplatform machined, spelling became whole on pontoon, and aquatic floating and transportation is to main pier pier position.After completing inserted to play steel pipe pile movable supporting legs, the lifting Turnoverplatform is arranged on the steel pipe pile movable supporting legs, forms Drilling Platform for Bored Pile Construction in water.
3) trestle erection construction
Trestle considers that mobile crane is current, and the wide 4.5m that establishes of bridge adopts the long Φ 20cm of 8m timber to make bearing column; Timber row spacing 3m, two of every rows, spacing 3m.The single pile certain depth that buries.Laterally girder adopts the I400 i iron, and crossbeam and timber use the palladium nail fixing.Longeron adopts 3 I200 * 100 i iron, and surface layer is laterally laid the 5cm plank.
All need report the relevant department such as navigation channel to examine before the construction of platform and trestle, issue construction announcement; In position set up anti-collision steel pile tube and warning at night lamp, set up corresponding navigation, aids to navigation; The guiding shippping traffic is current, guarantees navigation and the construction safety of passing ships.
Bored Pile Foundation construction in 3 water
1) making of pile foundation casing with bury underground
A steel casing is made
Pile foundation steel casing design internal diameter is Φ 180cm, and it is that the A3 steel plate of δ=8mm rolls and forms that the steel casing adopts thickness.The steel casing is processed its length as required.Casing is shaped pedestal is set, and adopts the locator spreading, guarantees that reel is round, seam is tight.The groove double welding is adopted in welding, and all weld seams must be continuous, and are water-tight to guarantee.The steel casing carries out merogenesis in processing factory to be made, and is transported to drilling platform, the Site Welding spreading after qualified on inspection.Be to strengthen the integral rigidity of casing, add the steel band of the wide 20cm of thick 8mm at the welding point weldering place of meeting, casing footing place adds the steel band of the wide 30cm of thick 12mm as the sword pin.
B steel the cylinder s buried depth
According to geologic information and field investigation, place, main pier position is soft Muddy Bottoms cohesive soil, the lam impervious layer of moulding shape downwards from the riverbed.The heterogeneity of considering Muddy Bottoms cohesive soil under the riverbed easily causes local penetration, prevents the outside generation in casing bottom seepage flow, piping, the anti-phenomenon of boring a hole, and casing tilts, depression and make, and even causes the aperture to cave in.The steel casing must sink to Muddy Bottoms cohesive soil, lam impervious layer 4m following the degree of depth.Determine steel casing length 8.0m.Steel casing top mark is high concordant with the platform end face.Fig. 5 .2.4 is seen in the signal of steel the cylinder s buried depth.
C steel casing is buried underground
At first, on platform, setting-out is measured in the drilled pile position, press the code requirement location.Utilize longitudinal and transverse steel I-beam installation guide frame on drilling platform, leading truck is than the large 5cm of casing external diameter.Steel casing welded top is well for beating.Do and weld signal and see Fig. 5 .2.5 for making.
Use is hung ship and is coordinated the DZ-60KW vibrating hammer, utilizes exciting hammer seaming hoisting steel casing, the steel casing is transferred in guide frame slowly, until its sword pin sinks to the riverbed face naturally.After proofreading and correct casing verticality (less than 0.5%) and casing plan-position deviation (less than 3cm), sink with hanging the equipment such as ship, vibrating hammer; And weld on demand the spreading casing, will adopt an effective measure during the weldable steel casing at the scene guarantees the straight degree of axis of steel casing; Until casing bottom arrival design elevation.
In this process, carry out whole process supervision with total powerstation and transit, with preventing offsetting, inclination etc., control its value and meet code requirement.
If the steel casing can not sinking to desired depth, utilize Φ 300mm airlift suction dredger, by surrounding behind first middle part again the order at middle part inhale mud, can be aided with water jetting at high pressure at the casing outer wall in case of necessity.
Steel casing sinking should be noted: should guarantee that casing is straight during steel casing welding spreading, weld seam is full; Vibrating hammer center of gravity and casing central axis remain on same straight line as far as possible.Start airlift suction dredger and must add water in the steel casing simultaneously, in casing, water level can not be lower than the river surface water level.In casing sinking process, when casing sinks in soil after certain depth, in time remove the casing leading truck, in order to avoid affect casing.Steel casing sinking must overall process be measured, and guarantees that casing off normal and gradient are in permissible range.
2) pile foundation construction process
The pile foundation construction process flow process is:
Measure unwrapping wire → casing to bury underground → pile-forming machine perching → stake position checks → pore-forming → whole hole, clear hole, propose brill → lower inspecting hole device → transfer reinforcing cage → catheter placement, secondary pile hole cleaning → underwater concreting → pile → pile foundation detection.
3) measure setting-out
Adopt the GTS-602 total powerstation to establish the station during construction lofting on the control point, make center and main axis or auxiliary construction baseline with the polar coordinates method, then according to axis or construction baseline, adopt J2B transit cooperation invar tape measuring stake position.More than the axial line control stake need be left works area 10m, the sample stake was long with 60cm
Reinforcing bar is demarcated on the spot, and reinforcing bar exposes 5～8cm, and red paint is coated in the termination.After setting-out is completed, must after recognizing, supervising engineer's label can spud in.
4) drilling construction
When adopting convolution rig positive-circulation drilling, rationally adjust rotating speed according to the continuous variation of geology, guarantee normal drilling depth, guarantee into hole perpendicularity.Will often test mud balance, water surface absolute altitude in retaining hole is strictly on guard against inclined hole, the generation of the hole phenomenon of collapsing.
When the abrasion drill drilling depth is obstructed, in the time of can't continuing to creep into, should in time notify the supervising engineer, and the transposing Churn drill continues construction.At this moment, answer weighted mud proportion, guarantee hole quality.
The configuration quality of mud directly has influence on the success or failure of retaining wall, must pay close attention to the variation of mud property index in work progress, guarantees head height in the hole.
In pore forming process, should fill in borehole log by construction form in accordance with regulations.The content of record comprises that the casing top mark is high, pile top design elevation, pile top actual elevation, rig model, stratigraphic record, downtime and reason etc.; occur as collapse that hole, inclined hole, casing sink, the situation such as string hole should notify supervising engineer and project chief engineer at once, takes rational measure to remedy.
5) brill is carried in whole hole
Behind whole hole, project management department reports the supervising engineer to carry and bores the examination of whole hole under the qualified prerequisite of self check.The content of checking and accepting comprises aperture and hole depth.The aperture is detected with the inspecting hole device, and hole depth is with measuring through the lining rope of demarcating.Determine to reach after designing requirement can clear hole half an hour, then pull out of hole.
6) fabrication of reinforcing cage with hang
The inspecting hole device verify qualified after, should arrange immediately to transfer reinforcing cage.Reinforcement cage skeleton is made according to the design length merogenesis, every joint length 9～10m.Be ensure quality, reinforcing cage is made in processing plant, and the colligation moulding, is transported to the scene with flatcar.The reinforcing rib point is welded on main muscle, guarantees reinforcement cage skeleton rigidity, and in case of necessity, available cross prevents distortion with the reinforcing cage temporary supporting.After the spiral stirrup straightening, colligation is on main muscle equably, and for guaranteeing to be connected firmly, every joint reinforcing cage stirrup point is welded on main muscle.Main muscle joint can not surpass 50% in same cross section, and lap position must be by the standard 1m that staggers.Steel bar cage protecting layer is made round pie with mortar in advance, and the centre stays a hole can wear reinforcing bar.After reinforcement cage skeleton is made, the concrete protective piece is through on stirrup, same cross section arranges four, vertically is staggeredly arranged.
Reinforcing cage is transported to position, hole place by pontoon, utilizes that rig or crane merogenesis lift by crane, lay, each section reinforcing cage is welded in the aperture.
Reinforcing cage is slowly sling and is moved to the aperture, and the reinforcing cage after normotopia being hung in the hole under workman's support (has will removing of cross muscle).When the skeleton hand-hole, should remove earth and foreign material on cage of reinforcement, repair the stirrup of distortion or displacement.During the reinforcing cage welding, up and down two joints must guarantee on same vertical curve, main muscle overlap joint employing one side welding, and fusion length 〉=10d (d is bar diameter) if design separately has regulation, should carry out by design operation.Before welding, wring with steel bar wrench, spot welding makes two main muscle closely connected, carries out vertical position welding.During install reinforcing cage, the scene arranges many electric welding machines and welds simultaneously, to shorten the install reinforcing cage time.After steel bar welding access node bundle, forbid the reinforcing bar welding section is transferred hand-hole at once, prevent that reinforcing bar from quenching.
Reinforcing cage top spacer bars length must highly according to the stake top mark be calculated, and guarantees that its anchorage length of going deep into cushion cap meets design and code requirement.For preventing off-position of steel reinforcing bar, can add the weldering spacer bars on the reinforcing cage top, be connected with casing.
7) underwater concrete perfusion
After reinforcing cage is transferred and is completed, i.e. catheter placement.Select Dg250 snap joint steel pipe during pouring underwater concrete, utilize the stake machine to transfer section by section.Conduit should carry out watertight test in advance, must not leak, gas leak phenomenon.
Inspection and secondary pile hole cleaning work before a perfusion
Reinforcement cage skeleton and conduit in place after, before pouring underwater concrete, use the anti-secondary pile hole cleaning that loops, until sediment thickness meets designing requirement less than design or setting, hole depth.
The first batch of concrete perfusion of b
Concrete is mixed and stirred by the agitator of precasting yard, and concrete tank is transported to the aperture.First batch of concrete should first be mixed 0.5m
3The same label mortar of left and right.During perfusion, mortar will be before concrete, prevents that conduit mouth from being blocked by aggregate.The volume of storage bin(hopper) will equal or be slightly larger than the first batch of volume of concrete of calculating.
The reserves of concrete bucket also will lift conveniently except satisfying first batch of concrete quantitative requirement, open flexibly, and are simple to operate, not spillage.The suspension bucket drain hole is advisable with 0.3～0.5m apart from the distance of funnel.
Before concrete perfusion, reply water proof bolt checks comprehensively.The scope of examination has: ball formula water proof bolt is apart from whether starching surperficial height in the 30cm left and right; Whether nimblely cross ball; Whether the iron wire fixed end is firm; Whether wire installation is stable.After passed examination, can carry out next procedure.
Calculate first batch of concrete quantity (stake footpath
Stake is example, the long 90m of stake):
V＝πd
2h
1/4+πD
2H
c/4
In formula: h
1〉=r
wH
w/ r
c=1.0 * (97-1.4)/2.4=39.83m
Calculate V=4.77m by formula
3So the minimum first batch of groundwater increment of this bridge bored pile is 4.77m
3
Along with the unlatching of storage bin(hopper), slowly in hopper, after the funnel inner concrete was filled, reserves of storage bin(hopper) will satisfy first batch of concrete needs to first batch of concrete, can cut simultaneously ball.Otherwise, continue to add concrete in storage bin(hopper), until after reaching the concrete of capacity, can cut ball and all concrete are fallen.For the accurately success or failure of the first batch of filling concrete of judgement, must accomplish that " seeing ", " listening ", " survey " combine." see " and refer in peep hole, whether head rises with excessive; Whether the conduit inner concrete descends smooth and easy; Whether conduit inner concrete face is lower than mud in the hole (if lower than mud face in the hole, illustrating that the conduit end opening is buried); Union has the problem of leaking in undirected hole.Whether the conduit inner concrete sends the very large rumble of drop when falling; When knocking conduit with hand hammer, whether send the sky sound.In this way, illustrate that concrete falls smoothly, side by side except the mud in conduit." listen " and refer to whether conduit has the sound that leaks." survey " refers to the distance of measured hole inner concrete face and the conduit inner concrete identity distance aperture water surface, with the depth of judgement pipe laying and the balance of pressure.
(3) perfusion of continuous concrete
The continous pouring concrete should be noted following several respects work:
1. in time in measured hole and the height of conduit inner concrete face, and conscientiously fill in the filling concrete record sheet.Length immediately according to conduit in the hole is calculated the buried depth of conduit in concrete, and buried depth is controlled between 2.0～6.0m.The higher limit of depth of tremie or conduit inner concrete are excessive when still not descending, and mention conduit and satisfy the requirement for restriction of buried depth, unload to surpass the conduit that needs height, deposit in standby place after it is scrubbed clean.During near reinforcing cage, pipe laying depth will be controlled in less scope when the hole inner concrete, to reduce concrete to the buoyancy of skeleton, prevents the cage of reinforcement floating.Buried depth until reinforcing cage in concrete surpasses 5m and conduit lower end when above higher than reinforcing cage lower end 2m, can strengthen buried depth to higher limit.
2. often observe the excessive situation of mud in casing.During perfusion, mud is continuously outside tap hole.Otherwise, should ascertain the reason, in time take appropriate measures, prevent the concrete obstruction conduit.During near reinforcing cage, whether have rising phenomenon, if any taking immediately corresponding treatment measures if observing reinforcing cage at hole inner concrete face.
3. in filling process, guarantee that enough head height are arranged in the hole (with pore-forming time require identical).As all technical of the mud that returns up (except density) meets instructions for use, and available slush pump is reused mud veclamation to mud pit, to reduce costs cost.In perfusion, the concrete of forbidding to be scattered falls in the hole, avoids increasing the beds of precipitation thickness on concrete surface and increases the pressure of conduit lower end, brings unnecessary difficulty to concrete perfusion.When promoting conduit, should avoid conduit to tilt or the scratching reinforcing cage.
4. when hole inner concrete face during near design elevation, to in time estimate in transport vehicle or in carrier pipe and stir amount of concrete, and surplus and the filling concrete difference of the amount of concrete of the interior superelevation part of conduit, so that agitator performs supply plan, reduce waste.
5. before filling concrete is complete, suitably increase the measurement number of times of filling concrete height, and prevent because carrying the too fast folder mud that causes of pipe.Perfusion latter stage, conduit inner concrete pressure reduces, and be to guarantee the pile crown quality, conduit and funnel should be improved, and makes that conduit is suitable for reading exceeds the water surface 4～6m in stake top or casing, and should not take back and forth to promote the method concrete perfusion of duct height.Pour into latter stage, mud is denseer, often carries a large amount of clods secretly, should consider the super filling height of 50cm, guarantees the pile crown quality.
6. pour into complete after, should slowly promote the final section conduit, when it will leave concrete surface, slow-down, in case the mud above concrete and sediment are clamp-oned in the aperture that conduit leaves over, cause a heart leakiness and folder mud, affect quality of pile.After conduit proposes, according to the concrete total amount of reality perfusion, inverse hole expansibility and an average footpath, and count original record.
8) mud conditioning
The mud emission that this engineering construction produces is prepared to adopt outward transport and processes on the spot the way that combines to solve.Mud conditioning must accomplish to meet environmental requirement in accordance with the regulation on tender document, does not cause environment pollution, does not affect irrigation and water conservancy.Therefore will with local conclude a bargain, obtain the approval of relevant department.Outward transport is emitted in the stream of beheaded river tail end or appointment on the ground waste, also can be transported to stack.Processing on the spot is with after the moisture evaporation, and the earth of plastic shape is deposited in below bridge opening.The mud that the construction of water pile foundation produces ships off on the bank, and processing mode is the same.
9) pile foundation detects
The pile foundation testing is carried out after the pit earthwork excavation is complete.
The pile foundation testing of this engineering is undertaken by owner and the supervising engineer unit of appointment, after we will gather pile No. to be detected in advance, detects unit by notification from supervising engineer.Before examining report is not received, forbid to carry out the next process construction.
Claims (5)
1. construction method of turnover platform for underwater pile foundation of bridge is characterized in that comprising the following steps:
The construction of a Turnoverplatform movable supporting legs inserted to play, during inserted to play, at first station keeping ship casts anchor and is positioned at design attitude, hangs ship and moves to the side by the location of casting anchor, and the station keeping ship position error is not more than 20m; Determine the stake position, four angles of platform; Utilize vibrating hammer seaming lifting location steel pile tube, at four jiaos of platform, respectively sink to a steel pipe pile and locate; Lay the guiding girder steel on the location steel pile tube; Utilize the guiding girder steel to locate, by root inserted to play steel pipe pile, until all; The steel pipe pile inserted to play requires the maximum off normal of level less than 15cm, and gradient is less than 1%;
B installs Turnoverplatform, and in movable type water, Turnoverplatform is transported to main pier pier position, and after completing inserted to play steel pipe pile movable supporting legs, the lifting Turnoverplatform is arranged on the steel pipe pile movable supporting legs;
The c trestle is set up, and adopts timber to make bearing column; Crossbeam and timber use the palladium nail fixing; Longeron adopts i iron, and surface layer is laterally laid plank;
D steel casing is buried underground, at first, on platform, setting-out is measured in the drilled pile position; Utilize longitudinal and transverse steel I-beam installation guide frame on drilling platform, guide frame is larger than steel casing external diameter; Use is hung ship and is coordinated vibrating hammer, utilizes vibrating hammer seaming hoisting steel casing, the steel casing is transferred, until its sword underfooting sinks to the riverbed face; Proofread and correct steel casing verticality less than 0.5% and steel casing plan-position deviation less than 3cm after; In this process, carry out whole process supervision with total powerstation and transit, with preventing offsetting, inclination, control its value and meet code requirement;
E measures setting-out, adopts total powerstation to establish the station during construction lofting on the control point, makes center and main axis or auxiliary construction baseline with the polar coordinates method, then according to axis or construction baseline, adopts transit cooperation invar tape measuring stake position; More than the axial line control stake need be left works area 10m, the sample stake was demarcated on the spot with reinforcing bar, and reinforcing bar exposes 5～8cm, and red paint is coated in the termination;
The f drilling construction when adopting convolution rig positive-circulation drilling, is guaranteed into hole perpendicularity, water surface absolute altitude in retaining hole;
G carries brill in whole hole;
The h reinforcing cage hangs, and reinforcing cage is transported to place, position, hole by pontoon, utilizes the lifting of rig or crane merogenesis, lays, and each section reinforcing cage is welded in the aperture; Reinforcing cage is sling and is moved to the aperture, and the reinforcing cage after normotopia is hung in the hole; When the skeleton hand-hole, remove earth and foreign material on cage of reinforcement, repair the stirrup of distortion or displacement; Before welding, wring with steel bar wrench, spot welding makes two main muscle closely connected, carries out vertical position welding; During the reinforcing cage welding, up and down two joints must guarantee on same vertical curve, main muscle overlap joint employing one side welding, and fusion length 〉=10d, d are bar diameter; After steel bar welding access node bundle, forbid the reinforcing bar welding section is transferred hand-hole at once, prevent that reinforcing bar from quenching;
I underwater concrete perfusion, after reinforcing cage is transferred and is completed, i.e. catheter placement; Snap joint steel pipe during pouring underwater concrete utilizes the stake machine to transfer section by section; Reinforcement cage skeleton and conduit in place after, before pouring underwater concrete, use the anti-secondary pile hole cleaning that loops; During perfusion, mortar will be before concrete, prevents that conduit mouth from being blocked by aggregate; The volume of storage bin(hopper) will be equal to or greater than first batch of volume of concrete;
The perfusion of j continuous concrete, in measured hole and the height of conduit inner concrete face, the length according to conduit in the hole is controlled at buried depth between 2.0～6.0m; During perfusion, mud is continuously outside tap hole; In filling process, guarantee has enough head height in the hole, and in perfusion, the concrete of forbidding to be scattered falls in the hole, avoids increasing the beds of precipitation thickness on concrete surface and increases the pressure of conduit lower end, brings unnecessary difficulty to concrete perfusion; Pour into complete after, slowly promote the final section conduit, when promoting conduit, should avoid conduit to tilt or the scratching reinforcing cage;
The k mud conditioning;
The l pile foundation detects.
2. construction method of turnover platform for underwater pile foundation of bridge according to claim 1, is characterized in that: the making of reinforcement cage skeleton merogenesis, every joint length 9～10m; Reinforcing cage is adding man-hour, and the colligation moulding; The reinforcing rib point is welded on main muscle, guarantees reinforcement cage skeleton rigidity, with the reinforcing cage temporary supporting, prevents distortion with cross; After the spiral stirrup straightening, colligation is on main muscle equably, and every joint reinforcing cage stirrup point is welded on main muscle; Main muscle joint can not surpass 50% in same cross section, the lap position 1m that must stagger; Steel bar cage protecting layer is made round pie with mortar in advance, and the centre stays a hole can wear reinforcing bar; After reinforcement cage skeleton is made, the concrete protective piece is through on stirrup, same cross section arranges four, vertically is staggeredly arranged; During install reinforcing cage, the scene arranges many electric welding machines and welds simultaneously, to shorten the install reinforcing cage time.
3. construction method of turnover platform for underwater pile foundation of bridge according to claim 1, is characterized in that: tackle the water proof bolt before concrete perfusion and check comprehensively; The scope of examination has: ball formula water proof bolt is apart from whether starching surperficial height in the 30cm left and right; Whether nimblely cross ball; Whether the iron wire fixed end is firm; Whether wire installation is stable.
4. construction method of turnover platform for underwater pile foundation of bridge according to claim 1, is characterized in that: before filling concrete is complete, increase the measurement number of times of filling concrete height, and prevent because carrying the too fast folder mud that causes of pipe; Perfusion latter stage, conduit inner concrete pressure reduces, and be to guarantee the pile crown quality, conduit and funnel should be improved, and makes that conduit is suitable for reading exceeds the water surface 4～6m in stake top or steel casing; Pour into latter stage, mud is denseer, often carries a large amount of clods secretly, guarantee the super filling height of 50cm, guarantees the pile crown quality.
5. construction method of turnover platform for underwater pile foundation of bridge according to claim 1 is characterized in that: the steel casing adopts steel plate to roll and forms; The steel casing is shaped pedestal is set, and adopts the locator spreading, guarantees that reel is round, seam is tight; The groove double welding is adopted in welding, and all weld seams must be continuous, and are water-tight to guarantee; The steel casing carries out merogenesis in processing factory to be made, and is transported to drilling platform, the Site Welding spreading; Be to strengthen the integral rigidity of steel casing, add steel band in the welding point commissure.
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| CN102747726B (en) * | 2012-07-02 | 2016-05-18 | 江苏楚鼎建设工程有限公司 | The dry pore-forming steel pipe post of ultra-deep foundation pit pile driving construction engineering method |
| CN102720186B (en) * | 2012-07-10 | 2014-11-05 | 上海港务工程公司 | Underwater once pouring method for variable cross-section bored cast-in-place pile |
| CN103321239B (en) * | 2013-06-26 | 2015-09-30 | 中煤邯郸特殊凿井有限公司 | A kind of rig basis |
| CN104032740B (en) * | 2014-06-25 | 2016-05-04 | 中国电建集团华东勘测设计研究院有限公司 | A kind of device that utilizes buoyancy to alleviate steel-pipe pile hoisting weight |
| CN104947654B (en) * | 2015-07-01 | 2017-01-18 | 山东金城建设有限公司 | Complicated water area inclined rock face large-diameter cast-in-place pile construction method |
| CN106320333B (en) * | 2016-09-27 | 2023-12-22 | 中交天航南方交通建设有限公司 | Combined drainage type water filling pile device and construction method |
| CN109837929A (en) * | 2017-11-29 | 2019-06-04 | 平煤神马建工集团有限公司 | A kind of surveying setting-out method applied to photovoltaic plant construction |
| CN108049398A (en) * | 2017-12-05 | 2018-05-18 | 中交第四公路工程局有限公司 | Bridge location is in the pile base construction method in mud area |
| CN109914399B (en) * | 2019-03-21 | 2021-06-01 | 杭州公路工程监理咨询有限公司 | Environment-friendly pile foundation construction method |
| CN115434304A (en) * | 2022-08-06 | 2022-12-06 | 河南黄河河务局工程建设中心 | Construction method for long auger bored pile super-long reinforcement cage pile-entering hole |
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