CN105804448A - Vertical prefabricating construction method of cooling tower herringbone column - Google Patents
Vertical prefabricating construction method of cooling tower herringbone column Download PDFInfo
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- CN105804448A CN105804448A CN201610369321.8A CN201610369321A CN105804448A CN 105804448 A CN105804448 A CN 105804448A CN 201610369321 A CN201610369321 A CN 201610369321A CN 105804448 A CN105804448 A CN 105804448A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H5/00—Buildings or groups of buildings for industrial or agricultural purposes
- E04H5/10—Buildings forming part of cooling plants
- E04H5/12—Cooling towers
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
Abstract
The invention discloses a vertical prefabricating construction method of a cooling tower herringbone column.The method sequentially includes following processes: flattening and hardening a prefabricating yard; setting up a scaffold; mounting a formwork base; making rebars; binding the rebars; making a formwork; mounting the formwork; pouring concrete; demounting the formwork; maintaining the concrete.By using the method, prefabricating can be advanced, and construction period is shortened; the formwork can be quickly circulated and is convenient to mount, and progress is accelerated; number of formworks needing to be purchased is small, cost is saved, and the method is economical and applicable; a rebar cage is vertically mounted, so that accuracy of a position is easy to control and quality of the herringbone column is guaranteed.The method has the advantages of attractive appearance, saving of materials, high construction speed and good economic benefit.
Description
Technical field
The invention belongs to engineering construction field, relate to a kind of construction method, specifically a kind of herringbone column in cooling tower works vertical precast construction method, the circular herringbone column that this method is applicable to big-and-middle-sized cooling tower is prefabricated, and especially suitable prescription is high, the cooling tower project that the duration is nervous.
Background technology
Current double-curve cooling column herringbone column construction, except adopting except cast-in-place construction technique, also adopts prefabricating and constructing, prefabricated is divided into again level prefabricated and vertical precast two kinds.Often there are the common quality defects such as concrete surface honeycomb, pitted skin, pore, spillage, structural cracks, male and female face aberration, lateral thrust, cover to reinforcement deviation in the cast-in-place and prefabricated herringbone column of level; Surface Quality of Concrete defect processing difficulty is big, it is impossible to reach clear-water concrete standard.And vertical precast is compared other two kinds of techniques and can be prevented effectively from above common quality defect, there is reliable in quality, save duration, economic dispatch advantage.
Summary of the invention
It is an object of the invention to overcome prior art defect, it is provided that a kind of herringbone column in cooling tower works vertical precast construction method.
The purpose of the present invention can be achieved through the following technical solutions:
Herringbone column in cooling tower works vertical precast construction method, the method includes following process flow:
Prefabricated levelling of the land and hardening: first carry out levelling of the land, clear up to original soil layer, original soil layer lays rubble, compacting after-pouring concrete cushion, bury cable wind rope ground anchor peg underground in bed course surrounding simultaneously, and imbed anchoring draw ring, with concreting, after maintenance reaches intensity, unwrapping wire also sets up scaffold；
Scaffold building: by herringbone column's vertical precast scaffold demand unwrapping wire, carry out scaffold location, herringbone column vertical precast scaffold building height 14m, step pitch 1.5m, array pitch 1.5m, advance 1.5m, add 8 cable wind ropes by scaffold surrounding, between cable wind rope and support body, angle is 60 °, and adds diagonal brace at four turnings of support body；
Die plate base is installed: sets seamless steel pipe bottom herringbone column and supports, stretches in concrete.Its centrage overlaps with herringbone column's centrage, two ends iron plate welding closure.Level up bottom steel pipe after centering, make steel pipe uniform stressed.Then installing steel plate pallet, pallet is two pieces of splits, and with herringbone column's diameter for cut-off rule, there is supporting steel pipe installing hole centre, pre-drilled main muscle jack on pallet；
Reinforcement fabrication and colligation: the main muscle of herringbone column adopts straight screw sleeve to connect；The joint of longitudinal reinforcement staggers mutually, is not provided with splice bottom herringbone column, and stirrup is fabricated to helical form, cradles main muscle, and stirrup adopts the interface point of colligation joint, stirrup and main muscle completely to tie up；
Form work engineering: herringbone column's template adopts special-purpose steel template, makes semicircle template, assembles on ground；2 sections of semicircle template assemblies of herringbone column's fixed form every point form, suspension centre is installed and is located at template top, be seated at bottom template on the steel plate pallet supported, template segmentation is connected by number, then carry out perpendicularity correction with line pendant or theodolite, template institute seam bolt is fastened；
Concreting: scaffold tubes sets up concrete casting platform on herringbone column's template top；The thick cement mortar with concrete with match ratio of 30～50mm is first built, with mortar laying with casting concrete before building；
Form removable: reach after normal intensity 85% until post concrete, form removal pallet completes form removable work.Template manual demolition, first removes the steel pipe of fixed form, rear form removal connecting bolt；
Concrete curing: at concrete upper surface water seasoning after final set, before depanning, concrete strength reaches 50% rear form removal of design strength, after herringbone column's concrete form removal, the herringbone column fixed in support body being wound around plastic covering cloth or watering maintenance in time, curing time was no less than 14 days.
The present invention is relative to cast-in-place construction technique, and advantage is in that: 1, can be prefabricated in advance, saves the duration；2, template can quickly be had enough to meet the need, and model sheetinstallat is convenient, accelerates progress；3, purchase template number needed for less, save cost, economic and practical；4, concentration pre-casting reduces construction site；5, it is easy to control the accuracy of steel reinforcement cage installation site, it is ensured that herringbone column's mass；6, prefabricated support body is concentrated and is set up, it is possible to repeatedly reuse, and saves and sets up the time；7, being easy to the guarantee concrete compaction that vibrates, minimizing vibrating spear touches steel reinforcement cage and ensures that reinforcement location is accurate；8, after herringbone column has built can quality inspection in time, if off quality, it is possible to repair in time or again construct, can guarantee that quality, and the duration will not be delayed.
The present invention is compared with the horizontal prefabricating and constructing of herringbone column: 1, after the prefabricated herringbone column's form removal of level, and upper surface is relatively white, and lower surface is dark, produces male and female face, has chromatic aberration defect, apparent difference；And vertical precast will not produce aberration；2, horizontal precasting process, cannot vibrate in herringbone column top, cause concrete leakiness, and intensity is low；Vertical precast technique is conveniently vibrated, concrete compaction, and quality is secure；3, vertical precast herringbone column template turn around time is fast, convenient, and concrete strength reaches after design strength 50% just collapsible die；And horizontal precasting process template turn around time is long, and need to sling herringbone column can form removal.As can be seen from the above: vertical precast technique has apparent attractive in appearance, saving material, duration progress is fast, has the advantages such as good economic benefit.
Accompanying drawing explanation
For the ease of it will be appreciated by those skilled in the art that the present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the prefabricated herringbone column's supporting frame site plan of the present invention；
Fig. 2 is template of the present invention and supporting frame elevational schematic view；
Fig. 3 is the prefabricated pallet schematic diagram of herringbone column of the present invention；
In figure: herringbone column-1, herringbone column's template-2, embedded steel tube-3, steel plate pallet-4, reinforce steel pipe-5, the main muscle-6 of post, steel pipe jackscrew-7, seamless steel pipe hole-8, punching block-9, main muscle reinforced hole-10, etc. line of cut-11, steel plate pallet-12.
Detailed description of the invention
Herringbone column in cooling tower works vertical precast construction method, process flow:
Prefabricated levelling of the land and hardening scaffold building die plate base install reinforcement fabrication reinforcing bar binding template construct model sheetinstallat concrete-pouring template dismantling concrete maintenance；
Prefabricated levelling of the land and hardening
First carrying out levelling of the land, cleaning backfill soil, fertile soil etc. are to original soil layer.By code requirement, before scaffold construction, check the ground survey report in this region, closely knit process need to be carried out as foundation bearing capacity is not more than the region of 15t/.It is on relatively solid original soil layer according to prefabricated site foundation, original soil layer lays 100mm rubble, compacting after-pouring 150mm thickness C15 concrete cushion, set in bed course surrounding simultaneously and bury 8 cable wind rope ground anchor pegs, two every, buried depth underground 1.5m, long 1m, wide 0.8m；And imbed φ 25 and anchor draw ring C15 concreting, after maintenance reaches intensity, unwrapping wire sets up supporting steel pipe scaffold.
Scaffold building
That draw circle in Fig. 1 is prefabricated herringbone column, amounts to 96 herringbone columns 1, and every herringbone column 1 diameter is 800mm, height 11114mm.By herringbone column's vertical precast scaffold demand unwrapping wire, carry out scaffold location.Herringbone column vertical precast scaffold building height 14m, step pitch 1.5m, array pitch 1.5m, advance 1.5m, be shown in Fig. 2.Cushion cap surrounding sets operation path, and completely spreads colligation with scaffold board, and scaffold southern side sets upper and lower zigzag escape way one place.Scaffold building adopts φ 48 steel pipe.Scaffold surrounding arranges the escape way of width 1000mm.
Falsework four limit is abound with vertical bridging, and centre is arranged vertical rods every four and arranged one vertical bridging of vertical, horizontal, by the setting continuously of the end to top；Falsework four limit with middle every 4 arrange vertical rods from top layer start to arrange every 2 steps downwards together with horizontal cross brace.Scaffold surrounding adds 8 φ 14 cable wind ropes, and between cable wind rope and support body, angle is 60 °, and adds diagonal brace at four turnings of support body.
Die plate base is installed
Scaffold construction carries out the installation of φ 203 × 12 seamless steel pipe after terminating, it is 1500mm that seamless steel pipe stretches into the length in concrete, and the length of exposed parts is 1494mm；Built-in pipe φ 203 × 12 centrage overlaps with post centrage, with the welding closure of 20mm thickness iron plate bottom seamless steel pipe；Stretch into the welding closure of concrete upper end part 3mm thickness iron plate.On prefabricated herringbone column's support body ground, every hole, the cross line of ink marker is played before installing, to ensure that steel pipe is on herringbone column's centrage, φ 203 × 12 pipe is installed and is adopted 25t crane to install, centering is carried out with two line pendants in both direction after footing is in place, to ensure the perpendicularity of steel pipe, level up bottom φ 203 × 12 with alignment pin with plank after centering, make steel pipe uniform stressed.Installing 960 × 960 × 20mm steel plate pallet after having lifted, each steel plate pallet is drilled 28 diameters before making be 25 main muscle jacks, and jack diameter is 30mm, sees Fig. 3.Pallet is fixed, with [pallet in 10 channel-section steel holders, and [supporting with steel pipe jacking under 10 channel-section steels, no less than 5 steel pipe jackings under every channel-section steel, jacking is connected with support body entirety scaffold tubes, fastener.Steel pipe jacking bottom stands in that [on 10 channel-section steels, jacking surrounding scaffold tubes is fixed.
φ 203 × 12 steel pipe effect is when herringbone column lifts, and welds with built-in fitting bottom buttress, plays the fixing herringbone column of support, unloads herringbone column's active force to water tower ring base effect.
Reinforcement fabrication and colligation
1, reinforcement fabrication: arranged in pairs or groups according to length length by same specification reinforcing bar, plans as a whole discharge.Generally should first break long material, rear disconnected short material；In cutting-off process, as found, reinforcing bar has splitting, drop-head or serious elbow etc. to excise.
The main muscle of herringbone column is diameter is the grade III steel of 25, adopts straight screw sleeve to connect.
Reinforced bar straight thread is processed: the thread form of reinforced bar straight thread silk head of processing, pitch are consistent, the bald tooth part in effective screw thread section, and cumulative length detains the 1/2 of girth less than one.
Hooped reinforcement is processed: stirrup uses the round steel of diameter 14, is fabricated to the helical form that diameter is 730mm.
2, reinforcement installation: the joint of herringbone column's longitudinal reinforcement should stagger mutually, must not arrange splice within the scope of 500mm bottom herringbone column.Stirrup is fabricated to helical form, cradles main muscle.Stirrup adopts colligation joint, lap of splice 700mm, and the interface point of stirrup and main muscle should completely be tied up, and the tied silk head after the crotch of reinforcing bar and colligation should protective layer dorsad, it is to avoid rust staining occurs in concrete surface.
Reinforcement installation construction point
1, herringbone column's vertical reinforcement adopts straight screw connection technique, and the diameter reinforcing bar more than 25mm adopts straight screw sleeve.Sleeve connection technological requirement: two connected reinforcing bar end faces should be at the centre position of adapter sleeve, deviation is not more than 1P (P is pitch), and tightens with work wrench, makes two reinforcing bar end face tightenings.Standard type joint exposes screw thread after installing and is not preferably greater than 2p, and during installation, minimum screw-down torque value is 260N.m.
2, once hanging in support body with crane by the binding of main muscle, then manually insert in steel plate pallet hole by root by main muscle, use snap ring to be fixed on pallet by main muscle, 1300mm is exposed in main muscle bottom.
3, for ensureing concrete cover uniformity; to avoid reinforcing bar distortion and deformation when concrete enters mould; the reinforcement bar support pushing out ring (diameter is 730mm) of 3 road Ф 14 is set (namely inside steel reinforcement cage) in main muscle, respectively on top, bottom and centre reinforcement bar support pushing out ring is set.
4, during colligation stirrup, on main muscle, the position of every rectilineal hoop should first be marked with slate pencil.Colligation adopts 4 strands of wirings, and each cross point propping up pushing out ring muscle in main muscle and stirrup, measure carries out colligation, and the tie wrap of adjacent colligation point to become splayed, and wiring head must stretch to direction inside herringbone column.The main muscle of herringbone column should be uniformly distributed, and pillar two ends 2m ranges for tie hoop encrypted area.Exposed steel bar place, herringbone column upper end increases by two circle stirrups, increases wiring number of share of stock and makes its colligation firm, to strengthen main muscles and bones frame rigidity, it is prevented that when herringbone column's molding hangs, steel wire rope collides main muscle and causes top edge concrete destruction.
5, cover to reinforcement: in order to herringbone column's cover to reinforcement meets the requirements, reach 35mm, the vertical 1000mm of protective layer arranges a circle, and a circle arranges 4 cushion blocks.Institute's matcoveredn cushion block is fixed on hoop；In order to avoid steel reinforcement cage touches punching block, use fixation with steel wire steel reinforcement cage top, make steel reinforcement cage vertically upward.
6, the pre-buried lightning-arrest band steel of herringbone column and emepalcement casing: install lightning-arrest band steel after herringbone column's reinforcing bar binding is complete.Emepalcement casing is installed: strong point sleeve pipe during as herringbone column's hoisted in position, and two ends stopper or the cotton felt plug of sleeve pipe are tight, it is to avoid enter concrete during casting concrete and blocked by sleeve pipe.Sleeve pipe is firm with stirrup and lightning-arrest band steel colligation, it is prevented that shifts and comes off.
Form work engineering
1, template construct: template is single-unit Φ 800 × 3m semicircle template, assemble on ground, every 4 joints link together, serial number during assembling, every column template is according to number corresponding up and down, every column template can not obscure number with another root column template, paints and be indicated in awake destination locations outside template after the number of finishing.Connecting front ground and lay 200 × 200mm flitch, flitch length is 4m, and spacing is 1.5m, carries out levelling with level gauge, levelling rear fixation.Then carry out the assembling of herringbone column's template on flitch top, bracing wire carries out after straightening 2 saves herringbone column's template, saves herringbone column's templates by 2 with bolt and connects and tighten, assembles 4 joints like this.Polish flat, brush releasing agent again after cleaning foreign material rust cleaning.
2, model sheetinstallat
1) 2 sections of semicircle template assemblies of herringbone column's fixed form every point form, 25t crane is adopted to install, suspension centre is located at template top, it is seated on the steel plate pallet supported bottom template, template segmentation is connected by number, then perpendicularity correction is carried out with line pendant or theodolite, template institute seam bolt is fastened, template and support body are linked to be pipe collar with 5 road steel pipes fixed, with glass cement or cotton strap, foaming agent by tight for herringbone column's bed die gap plugging after completing, vertical seam adopts double faced adhesive tape closure.Plan to overlap template with 30, install concrete of 10 set after-pouring every time, form line production form.
2) herringbone column's punching block should be handled with care when lifting, avoids the generation template deformation that collides with as far as possible, and template connects with to wearing bolt, will tightening and must not lack, to prevent that template gap produces spillage.
Concreting
1, putting up platform: scaffold tubes sets up concrete casting platform on herringbone column's template top, except the manway of scaffold surrounding, in the middle of scaffold body firm at interval of 2m scaffold tubes and steel framed bent drawknot, lay scaffold board, scaffold board must not have when laying encorbelments, and arranges the fence of 1.2m outside manway.
2, concrete-agitating: should comprehensively check before concrete-agitating that whether concrete raw material and measuring equipment be qualified, carries out water cut test to sand, stone in advance, adopts coordination in works to carry out during ready-mixed concrete.The tolerance that concrete material weighs: cement, water, additive ± 2%, thick, fine aggregate ± 3%.
3, concrete transportation: transport adopts concrete to fill car transport, and haulage time cannot be greater than 1 hour, rested for a long time concrete initial set or when losing plasticity for some reason, should make waste disposal.Add water when forbidding in transit with discharging.Under high temperature or cryogenic conditions, concrete transportation instrument should arrange covering or lagging facility, to avoid the factor such as weather, temperature to affect concrete quality.
4, concreting: before concreting, the foreign material in cleaning template；The thick cement mortar with concrete with match ratio of 30～50mm is first built, with mortar laying with casting concrete before concreting.Owing to herringbone column is higher, cause building the discrepancy in elevation more than 2000mm, in order to prevent concrete from segregation phenomenon occurring, it is used as tumbling barrel with pump line with the steel pipe in footpath by installing before automotive pump flexible pipe, when pumping concrete is built, automotive pump flexible pipe and front end steel pipe are entirely insertable in template to from after template pallet 0.5m, beginning pumping concrete.To be inserted into 3 vibrating spears at every post after pump line inserts template, vibrating spear length is not less than 12m, becomes equilateral triangle to arrange and inserts point.Before building concrete, vibrating spear is firstly placed on distance pallet 100mm place, and then vibrate in blanking limit in limit, vibrates and should adopt " fast inserting is pulled out slowly ", and makes vibrating spear slightly twitch up and down in the process of vibrating, and upper and lower vibratory concrete is uniform.Each blanking is less than 500mm, and the vibrating time of each slotting point is the 20-30 second, is that level is no longer sunk with concrete surface, bubble no longer occurs, and surface glows mortar and is as the criterion, and answers collision free reinforcing bar, and vibrating spear must not collide suspension ring sleeve pipe, embedded iron parts.In concreting process, forbid to add water in mould, when concrete workability is poor, it is necessary to the measure such as take that reinforcement is vibrated.Bleeding in mould must be got rid of in time；The mortar sticking to template, reinforcing bar and built-in fitting surface should be removed at any time.The concreting intermittent time forbade more than 90 minutes.
In order to reduce the measure that concrete bubble is taked: 1, add air entraining agent in concrete；2 as it has been described above, take three vibrating spear equilateral triangles to arrange and vibrate；3, after often building 500mm height and having vibrated, rubber hammer is used to beat outside this part of punching block.
Herringbone column's pouring construction order is arranged: overlap template with 12, installs concrete of 12 set after-pouring every time, forms line production form.12 herringbone columns every time built are arranged symmetrically with according to opposite and build, it is prevented that herringbone column's support body, because discontinuity, topples over accident.
Form removable
After post concrete reaches normal intensity 85%, form removal pallet completes form removable work.Template manual demolition, first remove the steel pipe of fixed form, rear form removal connecting bolt, every column template only removes vertical connecting bolt, namely column template is vertically split into two halves, from template crowbar suitable for reading by template seam separately, article two, vertical seam operates simultaneously, template is made to separate from top to bottom, and move away post concrete 200mm, then with steel wire rope, template suspension ring are bundled, it is for clearance to ground that every post hangs support body with 25t truck crane at twice, special messenger commander is set during lifting, send 2 people in the middle part of column template and hold up post lifting template, slowly lift by crane, quick acting is forbidden to collide support body and herringbone column.After two pieces of templates remove, herringbone column divides three sections to fix: herringbone column top fixing means is by a steel pipe from the middle traverse of herringbone column, and steel pipe is fixed on scaffold, and herringbone column two ends use fastener to fix, it is prevented that herringbone column's sliding.Middle and lower part is the same with fixed form mode uses pipe collar to fix.Pallet dismounting order is: first fix herringbone column, then first removes pallet bottom jacking and channel-section steel, and pallet is exited by from herringbone column's lower rebar.After herringbone column's pallet and jacking are removed, herringbone column bottom is supported by seamless steel pipe.
Concrete curing
At concrete upper surface water seasoning after final set, before depanning.Concrete strength reaches 50% rear form removal of design strength, after herringbone column's concrete form removal, the herringbone column fixed in support body is wound around plastic covering cloth or watering maintenance in time, and curing time was no less than 14 days.
The principle of the invention and technical essential:
1, prefabricated scaffold Main Function is fixing herringbone column, and suffered by it, vertical load is only small.The maximum potential safety hazard of prefabricated scaffold is affected by horizontal force, has and topples over risk.Therefore, scaffold should carry out bridging diagonal brace, it is ensured that the globality of support body；Four diagonal braces are made, it is ensured that scaffold horizontal force is unloaded to ground at four big feet of scaffold.
2, to ensure that prefabricated herringbone column's template is vertical, if template tilts, scaffold horizontal force can be caused, have certain security risk；Template is fixed；Main muscle and pallet gap and φ 203 × 12 embedded steel tube gap sealing, it is prevented that spillage occurs, affects pouring quality.
3, reinforcing bar binding, notes tied silk head template dorsad；Cushion block fixation, and be all fixed on stirrup；Steel reinforcement cage is vertically fixed, and is strictly on guard against oblique bending, touches template.
4, concreting notices that employing adds the modes such as tumbling barrel, it is ensured that builds and is highly not more than 2m, it is to avoid concrete disintegration；Adopt three vibrating spear equilateral triangles to arrange to vibrate, slowly promote with concreting, vibration compacting.
5, use thin film moisture-keeping maintaining after form removal, strengthen finished product protection.
6, when herringbone column builds, opposite symmetry build, it is prevented that support body discontinuity, topple over；During lifting, also it is opposite symmetry lifting, it is prevented that support body discontinuity, topples over.
Application example
This method is Successful utilization in the engineerings such as Shandong company (6 × 600MW) unit 4#, 5#, 6# cooling tower works, state's electricity certain cogeneration of heat and power (2 × 300MW) unit.
Shandong company (6 × 600MW) unit 4#, 5#, 6# cooling tower works.Herringbone column adopts vertical precast, herringbone column's diameter to be 800mm, is highly 11114mm.Herringbone column's vertical precast engineering builds first herringbone column on June 29th, 2015, and August 8 has built all herringbone columns；On October 15th, 2015 has lifted.Engineer applied herringbone column vertical precast construction technology, speed of application is fast, superior in quality.Obtain the unit favorable comment such as owner, management, obtain good economic benefit and social benefit.
State electricity certain cogeneration of heat and power (2 × 300MW level) engineering 5500m2Cooling stack, this engineering herringbone column diameter 650mm, single column 88, it is 8.71m that single-piece builds length.On March 15th, 2012 starts prefabricated, and on April 16th, 2012 is prefabricated to complete, and completes lifting on May 12nd, 2012.The prefabricated quality of herringbone column is good, specious, leaks the bad phenomenon such as muscle voids and pits without hole spillage.Achieve good social benefit and economic benefit.
Above content is only to present configuration example and explanation; described specific embodiment is made various amendment or supplements or adopt similar mode to substitute by affiliated those skilled in the art; without departing from invention structure or surmount the scope that present claims book is defined, protection scope of the present invention all should be belonged to.
Claims (7)
1. herringbone column in cooling tower works vertical precast construction method, it is characterised in that the method includes following order process flow:
Prefabricated levelling of the land and hardening: levelling of the land is cleared up to original soil layer, lays rubble, compacting after-pouring concrete cushion on original soil layer, bury cable wind rope ground anchor peg underground in bed course surrounding simultaneously, and imbed anchoring draw ring, with concreting, after maintenance reaches intensity, unwrapping wire also sets up scaffold；
Scaffold building: carry out scaffold line setting, scaffold building height 14m, step pitch 1.5m, array pitch 1.5m, advance 1.5m by prefabricated herringbone column's quantity and specification requirement；
Die plate base is installed: sets seamless steel pipe bottom herringbone column and supports, stretches in concrete, level up bottom steel pipe, then installing steel plate pallet, pallet is two pieces of splits, with herringbone column's diameter for cut-off rule, there is supporting steel pipe installing hole centre, pre-drilled main muscle jack on pallet；
Reinforcement fabrication and colligation: the main muscle of herringbone column adopts straight screw sleeve to connect；The joint of longitudinal reinforcement staggers mutually, is not provided with splice bottom herringbone column, and stirrup is fabricated to helical form, cradles main muscle, and stirrup adopts the interface point of colligation joint, stirrup and main muscle completely to tie up；
Form work engineering: herringbone column's template adopts steel form, is fabricated to semicircle template, assembles on ground；
Concreting: scaffold tubes sets up concrete casting platform on herringbone column's template top；The thick cement mortar with concrete with match ratio of 30～50mm is first built, with mortar laying with casting concrete before building；
Form removable: reach after normal intensity 85% until post concrete, form removal pallet completes form removable work；
Concrete curing: at concrete surface water seasoning after final set, before depanning, concrete strength reaches 50% rear form removal of design strength, after herringbone column's concrete form removal, the herringbone column fixed in support body is wound around plastic covering cloth or watering maintenance in time.
2. herringbone column in cooling tower works vertical precast construction method according to claim 1, it is characterised in that described scaffold surrounding adds 8 cable wind ropes, and between cable wind rope and support body, angle is 60 °, and add diagonal brace at four turnings of support body.
3. herringbone column in cooling tower works vertical precast construction method according to claim 1, it is characterised in that described prefabricated herringbone column's quantity is 96.
4. herringbone column in cooling tower works vertical precast construction method according to claim 1, it is characterised in that described seamless steel pipe supports centrage and overlaps with herringbone column's centrage, two ends iron plate welding closure.
5. herringbone column in cooling tower works vertical precast construction method according to claim 1, it is characterised in that the main muscle of described herringbone column is diameter is the grade III steel of 25；The joint of longitudinal reinforcement staggers mutually, and its connecting length is 50d；Stirrup uses the round steel of diameter 14mm, is fabricated to the helical form that diameter is 730mm.
6. herringbone column in cooling tower works vertical precast construction method according to claim 1, it is characterized in that, 2 sections of semicircle template assemblies of described herringbone column's fixed form every point form, suspension centre is installed and is located at template top, it is seated on the steel plate pallet supported bottom template, template segmentation is connected by number, then carries out perpendicularity correction with line pendant or theodolite, template institute seam bolt is fastened.
7. herringbone column in cooling tower works vertical precast construction method according to claim 1, it is characterised in that described template manual demolition, first removes the steel pipe of fixed form, rear form removal connecting bolt.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107322757A (en) * | 2017-08-30 | 2017-11-07 | 中冶沈勘工程技术有限公司 | The making mould and preparation method of a kind of special-shaped root pile of prefabricated grouting behind shaft or drift lining |
| CN109083416A (en) * | 2018-07-27 | 2018-12-25 | 庐江荣睿建设工程有限公司 | A kind of Anti-cracking construction technology of clear-water concrete |
| CN109322531A (en) * | 2018-09-27 | 2019-02-12 | 中国能源建设集团广东电力工程局有限公司 | Large cooling column herringbone column template integral installation method |
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| CN107322757A (en) * | 2017-08-30 | 2017-11-07 | 中冶沈勘工程技术有限公司 | The making mould and preparation method of a kind of special-shaped root pile of prefabricated grouting behind shaft or drift lining |
| CN107322757B (en) * | 2017-08-30 | 2022-08-02 | 中冶沈勘工程技术有限公司 | Manufacturing die and manufacturing method of prefabricated grouting special-shaped root pile |
| CN109083416A (en) * | 2018-07-27 | 2018-12-25 | 庐江荣睿建设工程有限公司 | A kind of Anti-cracking construction technology of clear-water concrete |
| CN109322531A (en) * | 2018-09-27 | 2019-02-12 | 中国能源建设集团广东电力工程局有限公司 | Large cooling column herringbone column template integral installation method |
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Application publication date: 20160727 |