CN103526720B - Precast reinforced concrete piles formula groynes construction - Google Patents
Precast reinforced concrete piles formula groynes construction Download PDFInfo
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- CN103526720B CN103526720B CN201310450731.1A CN201310450731A CN103526720B CN 103526720 B CN103526720 B CN 103526720B CN 201310450731 A CN201310450731 A CN 201310450731A CN 103526720 B CN103526720 B CN 103526720B
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Abstract
The present invention discloses precast reinforced concrete piles formula groynes construction, comprises the steps: (a) reinforcement fabrication and installation; (b) concrete placings and maintenance; C () concrete casting is smash; D () construction road, slope and sidewalk are built; Prepare and clear base before (e) heavy sheet pile; The stake of (f) boatswain chair, sheet pile transport and location; G () is shaken heavy sheet pile. The present invention adopts reinforced concrete sheet pile to substitute enrockment groynes as groynes basis; basis is dark; self can remain stable under tidal bore and flood souring; thus compare with traditional enrockment groynes; the impact of tidal bore can better be born; not easily damaged; and operating period maintenance engineering amount is less; avoid the drawback frequently speedily carried out rescue work; there is higher quality safety coefficient, it is possible to prevent river waterflow from impacting the erosion attack to riverbank and washing away riverbed, improve navigation channel; form shoal, keep water and soil to safeguard river facies and the function of protection water Bio-diversity.
Description
Technical field
The present invention relates to precast reinforced concrete piles formula groynes construction.
Background technology
Pile groin construction is mainly studied and is completed premculded pile sinking construction difficult problem in the river courses such as the Qiantang River fast and effectively; give full play to the effectiveness of pile groin; to prevent river waterflow impacts based on the erosion attack on riverbank; play groynes in addition to slow down and wash away riverbed; improve navigation channel; form shoal, keep water and soil, safeguard river facies and the function of protection water Bio-diversity.
Since seawall embankment in 1998 is reinforced, the damp calamity in the Qiantang River no longer encroaches on two sides resident, but narrows due to river course, and tidewater is more dangerous. Within 1998, having at least 100 people to be swept away by tidewater so far, people more than 70 is dead. In river engineering, groynes is widely used hydraulic structure; Enclose and cultivate with, in tidal land engineering, groynes is also one of conventional buildings in transport development, river shoal. Groynes is as the river regulation widely used and safeguards buildings, and its main function does not flow direct erosion and produce to draw brush and destroy for protection river rock, simultaneously it also improving navigation channel, safeguard river facies and save from damage to play in aquatic field variation of living and act on.
In order to administer the Qiantang River, the successive dynasties have been invented the way in a lot of build seawall by successive dynasties, and T-shaped dam is the invention before more than 100 year. Facts have proved, build, to great river, the dike that a section is stretched into river, it is possible to alleviate tidewater to the impact on the dike pool, the Qiantang River, extend work-ing life and the moisture resistance intensity on the dike pool. The surging force that tradition groynes can bear tidal bore is less, easily damaged, and operating period maintenance engineering amount is relatively big, frequently speedily carries out rescue work.
Summary of the invention
It is an object of the invention to provide precast reinforced concrete piles formula groynes construction.
The present invention adopts following technical scheme:
Precast reinforced concrete piles formula groynes construction, it is characterised in that comprise the steps:
(a) reinforcement fabrication and installation: the reinforcing bar in sheet pile ensures the correct of position, plate pile tip alignment axis, main muscle joint adopts electric welding, and the quantity of joint arrangement in same cross section is no more than 50%;
(b) concrete placings and maintenance: adopting prefabricated field unified prefabricated, Sheet Steel Form is firmly smooth, and size is accurate; The long sheet pile of 18m adopts point two restrainings to do, and often saves 9m; Concrete adopts machinery mixing, and with the coarse aggregate of particle diameter 5-40mm, fine aggregate is with natural middle coarse sand, additional concrete hardening accelerator, concrete placings by sheet pile top to plate pile tip direction continuous placing, must not should interrupt, with the careful tamping of vibrator, build complete answer protecting cover watering maintenance be no less than 14 days;
C () concrete casting is smash: by having, corresponding qualification test unit determines concrete mix according to the material configuration of construction usage, when scene is mixed and stirred, water-cut variation situation according to building stones adjusts, concrete adopts amalgamator mixing, manpower dump truck enters expects that platform scale measures, concrete transportation utilizes manpower dump truck, put in storage after manually turning, before concrete placement, assembling reinforcement mesh sheet, make template, after concrete warehousing, manually close a position, poker vibrator vibrates, vibrating time is no longer significantly sunk with concrete and is no longer occurred that bubble starts bleeding and is as the criterion, surface artificial is floating, compress, continuity should be kept during concrete placement, build and after terminating, after 12-18 hour, carry out watering maintenance in time, keep concrete surface moistening, until specification specified period, carry out maintenance record, the dismounting time of template, according to temperature situation, control terminates more than 18 hours in concrete placement, it is as the criterion not damage green concrete during form removal,
D () construction road, slope and sidewalk are built: first throw with tidewater contact surface outside road, slope and build one layer of Steel Reinforcement Cage, use digging machine fill block stone throwing compound simultaneously, after having filled when one layer, continue the sinking second layer, until Steel Reinforcement Cage top layer and face, the pool are flat together; Sidewalk is built between upstream and downstream sheet pile, utilizes jackstone Steel Reinforcement Cage to fill, digging machine jackstone, synchronously carries out with sheet pile injection, simultaneously before Steel Reinforcement Cage is built in throwing, first basis steel is plugged in pricker and detects, record its height of beach, and selects coupling Steel Reinforcement Cage to carry out throwing;
Prepare before (e) heavy sheet pile and clear base: water level retreat to can injection elevation time, digging machine first descends the pool to be rebuild in road, slope and lower platform leveling, the heavy sheet pile axial location of sheet pile is carried out base clearly simultaneously, the boulder of construction site is cleaned out, is beneficial to the injection of sheet pile;
The stake of (f) boatswain chair, sheet pile transport and location: boatswain chair stake: under oil pressure bobbing machine behind the pool, vapour is hung in top, the pool and sheet pile is winched to lower platform, place end section at sheet pile and put a sleeper, it is to increase it is stable and proper that sheet pile is placed, be beneficial to next step machinery clamping plate stake work; Sheet pile transports: after sheet pile winches to lower platform, first the hydraulic pressure pincers of oil pressure bobbing machine are utilized to clamp sheet pile, then with manually packaging insurance rope, after the sheet pile of hydraulic pressure pincers pincers jail, sheet pile is vertically mentioned, march to construction location, manually hold up sheet pile in place, wherein on distance dam within 20 meters, adopt bobbing machine self to propose sheet pile transport; On distance dam beyond 20 meters, excavator is adopted to carry out sheet pile transport, it is to increase the speed of sheet pile injection; Location: sheet pile location adopts oil pressure bobbing machine and the measure location manually holding up sheet pile to combine, and the transit instrument that axial line control is pushed up by being arranged in the pool by builder is commanded, and controls well and carries out heavy sheet pile after gap and verticality;
G () is shaken heavy sheet pile: after sheet pile has been located, namely vibration switch is started, vibrational frequency is progressively strengthened from low grade to top grade, according to different geological conditions, the sinking velocity of control sheet pile injection: 1) running into the comparatively weak situation of ground, after location is terminated, is undertaken by low grade shaking heavy, the sinking velocity of control sheet pile, evenly sinks; 2) to run into foundation comparatively complicated or when native base is comparatively closely knit, first after location is terminated, being undertaken by low grade shaking heavy, now slow down injection speed, after waiting sheet pile to sink to more than riverbed 1.5m, progressively strengthens vibrational frequency, until sheet pile injection puts in place; 3) when remaining 1.5 meters of sheet pile injection, sheet pile insurance rope is taken off; Injection elevation is to stopping vibration when designing above 50cm, utilization after sending sheet pile device that sheet pile is delivered to certain elevation or injection 3-5 root again property send sheet pile, this send sheet pile sheet pile crest level higher than design elevation 20cm, after dam body, the dam whole injection of head sheet pile complete, carry out second time and send sheet pile, sheet pile measures design elevation with spirit-leveling instrument, and carries out mark with red paint, then with sending sheet pile device one by one sheet pile injection to be put in place.
Preferably, groynes sheet pile heavy sheet pile overall employing of construction attacks and occupies method, and each section of heavy sheet pile adopts the sequence of events of upstream again, first downstream.
The present invention, owing to have employed technique scheme, has following useful effect:
The cast of reinforced concrete sheet pile is convenient, without hole, it is ensured that quality product, saves labor again, saving steel, safe and reliable, flawless, intensity height, and shock resistance, penetration power are strong, it is to increase square pile weather resistance, splitting resistance and shock resistance, meet the needs of building pile foundation engineering. Reinforced concrete sheet pile is adopted to substitute enrockment groynes as groynes basis; basis is dark; self can remain stable under tidal bore and flood souring; thus compare with traditional enrockment groynes; the impact of tidal bore can better be born; not easily damaged; and operating period maintenance engineering amount is less; avoid the drawback frequently speedily carried out rescue work; there is higher quality safety coefficient, it is possible to prevent river waterflow from impacting the erosion attack to riverbank and washing away riverbed, improve navigation channel; form shoal, keep water and soil to safeguard river facies and the function of protection water Bio-diversity. This engineering method is practical and later maintenance cost is low, there are stronger suitability, considerable economic benefit, social benefit and ecological benefits: economic benefit: 1, the build of this T-shaped dam on river surface, tidewater can be alleviated to the impact on the Jiang Di pool, extend work-ing life and the moisture resistance intensity on the dike pool, change current situation, delay and release water flow impact pressure; 2, operating period maintenance engineering amount is less, and maintenance cost is low, and durability degree height, not easily damaged, and with tradition groynes ratio, it is lower that the later stage continues input; 3, this T-shaped dam can promote the development of shipping economy and drive the development of local related industries economy. Social benefit: 1, this T-shaped dam can make current concentrate on center, river course to increase flow velocity, degradation riverbed, suppress silt lodging, to be also conducive to increasing water depth of waterway; Simultaneously dilatory by riverain flow velocity, avoid current scour riverbank, reduce the work-ing life of river levee or cause certain soil erosion; 2, while there is increase water depth of waterway on this T-shaped dam, owing to the downstream side on T-shaped dam, two sides is little to flow velocity, certain silt lodging can be brought to be conducive to forming shoal. And the reduction of flow velocity is conducive to the maintenance of two sides water and soil and extends the work-ing life of embankment. Ecological benefits: 1, ecological benefits are mainly reflected in following three aspects: various stream effect, protection effect and bait effect. These three kinds of effects connect each other, complement each other, various stream makes various planktonic organism and zoobenthos become bait in this delay, there is provided fish to play and to look for food place, enemy can be kept away for meiofaunas such as juvenile fish in the protection space that framework water-permeable frame is formed, becoming excellent small habitat, ecological benefits are obvious; 2, the construction on T-shaped dam is conducive to formation shoal, downstream and keeps water and soil. Shoal and wetland have senior ecological structure and the more highdensity mos such as relatively.
Embodiment
Precast reinforced concrete piles formula groynes construction of the present invention, comprises the steps:
A () reinforcement fabrication and installation: the correct of strict guarantee position answered by the reinforcing bar in sheet pile, and plate pile tip answers alignment axis, main muscle joint adopts electric welding, and the quantity of joint arrangement in same load face must not more than 50%. After reinforcing bar enters prefabricated field, shaping by the unified making of design requirements by professional technique workman.
(b) concrete placings and maintenance: adopting prefabricated field unified prefabricated, Sheet Steel Form is firmly smooth, and size is accurate; The long sheet pile of 18m adopts point two restrainings to do, and often saves 9m; Concrete adopts machinery mixing, and with the coarse aggregate of particle diameter 5-40mm, fine aggregate is with natural middle coarse sand, additional concrete hardening accelerator, concrete placings by sheet pile top to plate pile tip direction continuous placing, must not should interrupt, with the careful tamping of vibrator, build complete answer protecting cover watering maintenance be no less than 14 days;
C () concrete casting is smash: by having, corresponding qualification test unit determines concrete mix according to the material configuration of construction usage, when scene is mixed and stirred, water-cut variation situation according to building stones adjusts, concrete adopts amalgamator mixing, manpower dump truck enters expects that platform scale measures, concrete transportation utilizes manpower dump truck, put in storage after manually turning, before concrete placement, assembling reinforcement mesh sheet, make template, after concrete warehousing, manually close a position, poker vibrator vibrates, vibrating time is no longer significantly sunk with concrete and is no longer occurred that bubble starts bleeding and is as the criterion, surface artificial is floating, compress, continuity should be kept during concrete placement, build and after terminating, after 12-18 hour, carry out watering maintenance in time, keep concrete surface moistening, until specification specified period, carry out maintenance record, the dismounting time of template, according to temperature situation, control terminates more than 18 hours in concrete placement, it is as the criterion not damage green concrete during form removal.
When the concrete strength of sheet pile can lift by crane after reaching the 75% of design strength standard value, intensity when sheet pile transports should reach the 100% of design strength standard value, adopts 5T fork truck entrucking, is equipped with two flatbed trailer transports, often plow and time can transport 8,20T vapour unloading car, sheet pile is deposited on face, the pool by specification, and supporting-point should be located at and hang a place, each layer chock aligns up and down, stacking the number of plies and be no more than 4 layers, stacking along the sheet pile protecting smooth injection should be once in place, avoids again rejecting.
D () construction road, slope and sidewalk are built:
Build the guarantee that construction road, slope is the lower pool operation of machinery, it is one of the key project of groynes construction. Safety must be guaranteed in construction road, slope in construction process, and therefore road, slope must have stronger bearing capacity, and owing to being subject to the impact of Qiantang River force tidal bore, road, slope also self must have the ability resisting force tidal bore. Road, slope is from high identical with tidal bore direction to low direction, and the old seawall in side, road, slope and the Qiantang River, by jail, is exposed and all adopted reinforcing bar cage mounted block stone mask with Qiantang River tidewater contact surface. In construction process, first throw with tidewater contact surface outside road, slope and build one layer of Steel Reinforcement Cage, use the long-armed digging machine fill block stone throwing compound of EC290 simultaneously, after having filled when one layer, continue the sinking second layer, until Steel Reinforcement Cage top layer and face, the pool are flat together. Road, slope should construction between neap flood season, with the building stones loss during reducing build.
Sidewalk is built between upstream and downstream sheet pile, utilizes jackstone Steel Reinforcement Cage to fill, digging machine jackstone, synchronously carry out with sheet pile injection, simultaneously before Steel Reinforcement Cage is built in throwing, first the basis plug in pricker of 3 meters of long steel is detected, record its height of beach, and select suitable Steel Reinforcement Cage to carry out throwing.
Prepare before (e) pile sinking and clear base:
Due to Qiantang River tidal bore, geological condition is very complicated under water in the Qiantang River, before piling construction, it is necessary to carry out necessary clear base work. Water level retreat to can injection elevation time, digging machine first descends the pool to be rebuild in road, slope and lower platform leveling, the pile sinking axial location of sheet pile carries out necessary clear base simultaneously, is cleaned out by the boulder of construction site, be conducive to the injection of sheet pile like this.
F () hangs stake, sheet pile transport and location:
1) hanging stake: under oil pressure bobbing machine behind the pool, vapour is hung in top, the pool and sheet pile is winched to lower platform, should place end section at sheet pile and put a sleeper, does like this and can improve the stable of sheet pile placement and rectify, and is conducive to next step machinery clip pile work.
2) sheet pile transport: after sheet pile winches to lower platform, first utilize the hydraulic pressure pincers of oil pressure bobbing machine to clamp sheet pile, then with manually packaging insurance rope (�� 17 wireline), after the sheet pile of hydraulic pressure pincers pincers jail, sheet pile is vertically mentioned, march to construction location, manually hold up stake in place. Wherein on distance dam within 20 meters, bobbing machine self is adopted to propose sheet pile transport; On distance dam beyond 20 meters, excavator is adopted to carry out sheet pile transport, to improve the speed of sheet pile injection.
3) locate: sheet pile location adopts oil pressure bobbing machine and the measure location manually holding up stake to combine, and the transit instrument that axial line control is pushed up by being arranged in the pool by builder is commanded, and controls well and carries out pile sinking after gap and verticality.
G () is shaken heavy sheet pile:
After sheet pile has been located, namely start vibration switch, from low grade to top grade, progressively strengthen vibrational frequency, according to different geological conditions, the sinking velocity of control sheet pile injection:
1) the comparatively weak situation of ground is being run into, after location is terminated, undertaken by low grade shaking heavy, generalized case just can put in place in injection, but should be noted in injection process, the sinking velocity of strict control sheet pile, evenly sinks, the indexs such as the verticality of stake, gap are controlled like this, it is also possible to guarantee pile quality than being easier to.
2) to run into foundation comparatively complicated or when native base is comparatively closely knit, first after location is terminated, being undertaken by low grade shaking heavy, now slow down injection speed, after waiting sheet pile to sink to more than riverbed 1.5m, progressively strengthens vibrational frequency, until sheet pile injection puts in place.
3) when remaining 1.5 meters of sheet pile injection, sheet pile insurance rope is taken off; Injection elevation, to stopping vibration when designing above 50cm, utilizes Pile feeder that stake is delivered to after certain elevation or injection 3-5 root property pile follower again, and this time pile follower height of pile top is generally higher than design elevation 20cm. After dam body, the dam whole injection of head sheet pile complete, carry out second time pile follower, sheet pile measures design elevation with spirit-leveling instrument, and carries out mark with red paint, then one by one sheet pile injection is put in place with Pile feeder.
Groynes sheet pile piling construction entirety adopts attacks and occupies method, and each section of pile sinking adopts the sequence of events of upstream again, first downstream.
Reinforcing bar concrete cap-beam and even constructing tie beam, reinforcing bar concrete cap-beam section is wide is 100cm, and thick is 50cm, links beam apart from spacing 2.0m, spacing 1.5m within the scope of dam head 12m within the scope of dam root 38m, and construction is arranged in little flood tide and carries out.
1. vertical mould: adopt Sheet Steel Form, dam head circular arc adopts customization steel mould, and all the other adopt Standard Steel mould, and molding reaches job specifications standard. Vertical mould is the key of whole concrete placings, how to improve the stability of template, prevents occurring the generation running the situation such as mould, template sedimentation in concrete placings, and my company passes through the construction of test groynes, summarizes the construction experience that some are feasible. First being solved the supporting & stablizing problem of template, main terms of settlement is: before vertical mould, in sheet pile steel plate upstream and downstream side, every 0.5m is welded a �� 18 7 font reinforcing bar; Secondly, when linking beam template construct, bed die steel pipe for use in reinforcement supports, and clamps with steel pipe chuck.
2. concrete mixes and stirs: adopt 2 400L amalgamator machineries to mix and stir, and amalgamator is put on top, the dam root pool. Weighing weighing, pull trolley charging, the mixing time is no less than specified requirement.
3. concrete transport: horizontal transport adopts and pulls trolley, carriage vertically adopts chute, unloads to lift surface.
4. vibrate: adopt poker vibrator vibrate, surface vibrate with vibration board again drag flat, finally with mud clip hold-down, smear light.
The material of this construction and equipment:
The label that concrete adopts is C30, and cement adopts the ordinary Portland cement of 42.5.
Main mechanical is Ph3000 high-frequency hydraulic vibration pile driving hammer, maximum vibration power 40 tons.
Plant table
The quality control of this construction:
The prefabricated quality of reinforced concrete sheet pile is according to " concrete construction specification " (DL/T5144-2001), " water conservancy project concrete reinforcement construction specification " (DL/T5169 2002), " water power hydro project template construction specification " (DLT5110-2000), " general purpose portland cement " (GB175-2007), " normal concrete is with broken, stone quality and test method standard " (JGJ52-2006), specification requirements such as " water resources and hydropower construction acceptance of work code " (SL223-2008), strictly control concrete material, reinforcing bar, template, concrete mixes and stirs, vibrate, the important critical point such as maintenance. for improving the prefabricated visual appearance of sheet pile, when the prefabricated sheet pile of test groynes, have employed sizing steel mould, ensure that it is reliably smooth, size is accurate. improve simultaneously and also shorten striking time, it is to increase the globality of concrete.
By the construction to test groynes, the relevant data that the accumulation every quality index of sheet pile requires, key Quality Control is as follows:
1. the control main method in sheet pile gap is: after sheet pile has been located, and when sheet pile just starts injection, sheet pile top slightly to outer incline, should utilize the large arm amplitude of adjustment bobbing machine to control. In injection process, due to the sinking with sheet pile, it is everlasting during bobbing machine forearm and carries out luffing, it is easy to cause sheet pile gap to change. Therefore, while sheet pile sinks, also want the continuous angle of reconditioner tool and the turnover of bobbing machine. Its middle and lower reaches solid matter sheet pile injection, when sheet pile injection is to half, sheet pile slowly Uprightness adjusting, and should make sheet pile near inner side so that it is to reach design requirements with the gap of adjacent sheet pile as much as possible. To the spacing control of upstream sheet pile and dam head interval stake, adopt and measure with line rod during location, make the distance between sheet pile meet design requirements.
2. testing during groynes quality situation adds up at us, other technical indicator of relative sheet pile injection, the height of pile top control of sheet pile is comparatively simple, and quality is also easy to control. This is that mechanical flexibility is relatively strong, controls the injection speed of sheet pile by control oil pressure, thus sheet pile height of pile top is met design requirement owing to utilizing oil pressure bobbing machine pillow heavy sheet pile. The height of pile top of sheet pile, adopts the method that two injections put in place. Namely when sheet pile injection highly remains in time exceeding about 30cm than design elevation, stopping injection, after waiting whole groynes dam body, dam head sheet pile injection to complete, unification carries out pile follower.
3. the axial line control of sheet pile mainly to be controlled well the location of sheet pile, when sheet pile is located, holding up stake person should adjust according to the commander of builder on the pool, builder observes according to the transit instrument being erected on the pool, and requires to hold up stake person to carry out adjustment sheet pile axial location at any time. When, in sheet pile injection process, journal offset occurs suddenly sheet pile, injection should be stopped immediately, take the method adjusting sheet pile injection angle, pile pulling is reorientated to control.
4. the control of sheet pile verticality is also most important. In injection process, if sheet pile is to upstream oblique, shakes because taking bobbing machine immediately while the method for inclined downstream, it is sure not to adjust immediately, prevent sheet pile from affecting sheet pile quality because of sudden change; In injection process as firm in sheet pile, it has been found that break under sheet pile and downstream run, vibrational frequency should be reduced, adjusting sheet pile vergence direction, namely which the lower end of sheet pile run toward, and stake top also tilts toward same direction simultaneously, make sheet pile pile top return to axial location and verticality meets design requirements, then continue to shake heavy. As, in adjustment process, sheet pile still made vertical, it is necessary to sheet pile is lifted again, reorientates injection.
5. sheet pile feathering angle is adjusted voluntarily by the rotation motor of bobbing machine.
6., in addition, before dam body and dam head sheet pile injection, base process clearly must be carried out with digging machine in injection position, to improve the injection total quality of sheet pile.
The application example of this construction:
Application example one:
1. project profile
Haining, standard seawall, Bei An dangerous section, Qiantang River section groynes first mark is in Miao Zhijiu storehouse, bank Haining City rice seedling bed, north, Qiantang River dike section, it is located in tidal bore zone, pile No. 54+100��57+100,63+900��64+500,75+100��78+700 total length is 7.2km, and wherein 54+100��57+100 section is groynes 1#��13# groynes, and 64+000��64+500 is 26#��28# groynes, 75+100��78+700 is 34#��52# groynes, amounts to newly-built pile groin 35.
Wall scroll groynes engineering structure is the long 50m in dam, dam crest elevation 3.0m. Wherein dam body, dam root partial-length are 38m, and dam head part length is 12m. Dam body, dam root portion downstream side plate stake solid matter are arranged; In vertical dam axis direction, a strengthening rib plate-girder is set toward upstream side 4.35m interval 1.5m far away, and with linking beam and downstream sheet pile is linked to be entirety, many groynes composition groynes groups continuously.
2. condition of construction
Construct groynes 35, footing sheet pile (35cm �� 25cm �� 10.5m) 2999 before the injection pool, dam body stake (25cm �� 40cm �� 11m) 6079, stake 2881 under dam head sheet pile (30cm �� 40cm �� 18m) 9m, the upper stake of 9m 2662, completing C35 concrete sheet pile and restrict 15300.89m3 in advance, sheet pile reinforcing bar system pacifies about 3103.6t, and steel plate system pacifies about 670.86t.
3. engineering result is evaluated
Reinforced concrete sheet pile groynes basis is dark; can remain stable under force tidal bore and flood souring; overcome the shortcoming of jackstone groynes in the easy unstability in force tidal bore region; all there is short silt in various degree before building up and running the rear pool, seawall, dangerous section, Haining in this groynes group simultaneously, effectively protects dangerous section maritime work.
Application example two:
1. project profile
Engineering is positioned at tidal bore zone, Chen Wengang dangerous section, Haining, the Qiantang River.
Haining, Qiantang River Chen Wengang groynes is rubble structure, and dam head is for hanging pilework, it has been found that dam head and the fracture of body junction, dam, dam head subsides. Make this section of seawall there is potential safety hazard, it is the safe thin spot of Haining section seawall flood control. Consider directly to reinforce this dam and there is follow-up maintenance difficulty, defect that to safeguard fund input big, economic efficacy is poor, therefore plan slotting in this groynes downstream side to build a novel pile groin. The long 70m of pile groin, dam crest elevation 1.3m, wherein body partial-length in dam is 58m, and dam head part length is 12m. Dam body portion downstream side plate stake solid matter is arranged; In vertical dam axis direction, a strengthening rib plate-girder is set toward upstream side 4.35m interval 1.5m far away, and with linking beam and downstream sheet pile is linked to be entirety.
2. condition of construction
Complete prefabricated 273 of 11m sheet pile, prefabricated 46 of 18m sheet pile, 11m sheet pile injection 223,18 meters of sheet pile injections 46, cap beam and link beam and build. Whole construction process quality, safe situation are controlled.
3. engineering result is evaluated
This project construction progress is quick, and each link coordinates close, consummate, and details construction is meticulousr, and better quality, cost is more rational, and benefit is obvious.
These are only specific embodiments of the invention, but the technology feature of the present invention is not limited thereto. Any based on the present invention, for solving substantially identical technical problem, it is achieved substantially identical technique effect, done ground simple change, equivalent replacement or modification etc., be all covered by among protection scope of the present invention.
Claims (2)
1. precast reinforced concrete piles formula groynes construction, it is characterised in that comprise the steps:
(a) reinforcement fabrication and installation: the reinforcing bar in sheet pile ensures the correct of position, plate pile tip alignment axis, main muscle joint adopts electric welding, and the quantity of joint arrangement in same cross section is no more than 50%;
(b) concrete placings and maintenance: adopting prefabricated field unified prefabricated, Sheet Steel Form is firmly smooth, and size is accurate; The long sheet pile of 18m adopts point two restrainings to do, and often saves 9m; Concrete adopts machinery mixing, and with the coarse aggregate of particle diameter 5-40mm, fine aggregate is with natural middle coarse sand, additional concrete hardening accelerator, concrete placings, must not be interrupted to plate pile tip direction continuous placing by sheet pile top, with the careful tamping of vibrator, build the watering maintenance of complete protecting cover and it is no less than 14 days;
C () concrete casting is smash: by having, corresponding qualification test unit determines concrete mix according to the material configuration of construction usage, when scene is mixed and stirred, water-cut variation situation according to building stones adjusts, concrete adopts amalgamator mixing, manpower dump truck enters expects that platform scale measures, concrete transportation utilizes manpower dump truck, put in storage after manually turning, before concrete placement, assembling reinforcement mesh sheet, make template, after concrete warehousing, manually close a position, poker vibrator vibrates, vibrating time is no longer significantly sunk with concrete and is no longer occurred that bubble starts bleeding and is as the criterion, surface artificial is floating, compress, continuity is kept during concrete placement, build and after terminating, after 12-18 hour, carry out watering maintenance in time, keep concrete surface moistening, until specification specified period, carry out maintenance record, the dismounting time of template, according to temperature situation, control terminates more than 18 hours in concrete placement, it is as the criterion not damage green concrete during form removal,
D () construction road, slope and sidewalk are built: first throw with tidewater contact surface outside road, slope and build one layer of Steel Reinforcement Cage, use digging machine fill block stone throwing compound simultaneously, after having filled when one layer, continue the sinking second layer, until Steel Reinforcement Cage top layer and face, the pool are flat together; Sidewalk is built between upstream and downstream sheet pile, utilizes jackstone Steel Reinforcement Cage to fill, digging machine jackstone, synchronously carries out with sheet pile injection, simultaneously before Steel Reinforcement Cage is built in throwing, first basis steel is plugged in pricker and detects, record its height of beach, and selects coupling Steel Reinforcement Cage to carry out throwing;
Prepare before (e) heavy sheet pile and clear base: water level retreat to can injection elevation time, digging machine first descends the pool to be rebuild in road, slope and lower platform leveling, the heavy sheet pile axial location of sheet pile is carried out base clearly simultaneously, the boulder of construction site is cleaned out, is beneficial to the injection of sheet pile;
The stake of (f) boatswain chair, sheet pile transport and location: boatswain chair stake: under oil pressure bobbing machine behind the pool, vapour is hung in top, the pool and sheet pile is winched to lower platform, place end section at sheet pile and put a sleeper, it is to increase the stability that sheet pile is placed and proper property, be beneficial to next step machinery clamping plate stake work; Sheet pile transports: after sheet pile winches to lower platform, first the hydraulic pressure pincers of oil pressure bobbing machine are utilized to clamp sheet pile, then with manually packaging insurance rope, after the sheet pile of hydraulic pressure pincers pincers jail, sheet pile is vertically mentioned, march to construction location, manually hold up sheet pile in place, wherein on distance dam within 20 meters, adopt bobbing machine self to propose sheet pile transport; On distance dam beyond 20 meters, excavator is adopted to carry out sheet pile transport, it is to increase the speed of sheet pile injection; Location: sheet pile location adopts oil pressure bobbing machine and the measure location manually holding up sheet pile to combine, and the transit instrument that axial line control is pushed up by being arranged in the pool by builder is commanded, and controls well and carries out heavy sheet pile after gap and verticality;
G () is shaken heavy sheet pile: after sheet pile has been located, namely vibration switch is started, vibrational frequency is progressively strengthened from low grade to top grade, according to different geological conditions, the sinking velocity of control sheet pile injection: 1) running into the comparatively weak situation of ground, after location is terminated, is undertaken by low grade shaking heavy, the sinking velocity of control sheet pile, evenly sinks; 2) to run into foundation comparatively complicated or when native base is comparatively closely knit, first after location is terminated, being undertaken by low grade shaking heavy, now slow down injection speed, after waiting sheet pile to sink to more than riverbed 1.5m, progressively strengthens vibrational frequency, until sheet pile injection puts in place; 3) when remaining 1.5 meters of sheet pile injection, sheet pile insurance rope is taken off; Injection elevation is to stopping vibration when designing above 50cm, utilization after sending sheet pile device that sheet pile is delivered to certain elevation or injection 3-5 root again property send sheet pile, this send sheet pile sheet pile crest level higher than design elevation 20cm, after dam body, the dam whole injection of head sheet pile complete, carry out second time and send sheet pile, sheet pile measures design elevation with spirit-leveling instrument, and carries out mark with red paint, then with sending sheet pile device one by one sheet pile injection to be put in place.
2. precast reinforced concrete piles formula groynes construction according to claim 1, it is characterised in that: groynes sheet pile heavy sheet pile overall employing of construction attacks and occupies method, and each section of heavy sheet pile adopts the sequence of events of upstream again, first downstream.
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| CN102286955A (en) * | 2011-07-01 | 2011-12-21 | 上海市水利工程设计研究院 | Reinforced concrete pile type dyke and construction method thereof |
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|---|---|---|---|---|
| JP3246143B2 (en) * | 1993-11-29 | 2002-01-15 | 新日本製鐵株式会社 | Steel sheet pile with porous material and steel sheet pile revetment |
| JP2003253649A (en) * | 2002-03-06 | 2003-09-10 | Tetra Co Ltd | Construction method for water area structure, and upper concrete-cover concrete member of caisson used in the same |
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| CN201459674U (en) * | 2009-09-01 | 2010-05-12 | 黄河水利委员会黄河水利科学研究院 | PHC tubular pile dam |
| CN102286955A (en) * | 2011-07-01 | 2011-12-21 | 上海市水利工程设计研究院 | Reinforced concrete pile type dyke and construction method thereof |
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