CN103590603B - Large span multi-curvature shell structure of reinforced concrete method - Google Patents

Large span multi-curvature shell structure of reinforced concrete method Download PDF

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Publication number
CN103590603B
CN103590603B CN201310564950.2A CN201310564950A CN103590603B CN 103590603 B CN103590603 B CN 103590603B CN 201310564950 A CN201310564950 A CN 201310564950A CN 103590603 B CN103590603 B CN 103590603B
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template
concrete
curvature
housing
bracing frame
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CN103590603A (en
Inventor
张谦
韩立江
田利坤
马泽琛
卢晓佳
季鹏
郑小川
李军
李�瑞
徐小烈
候丽霞
范贵元
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Third Construction Engineering Co Ltd of China Construction Second Engineering Bureau Co Ltd
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Third Construction Engineering Co Ltd of China Construction Second Engineering Bureau Co Ltd
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Abstract

A kind of large span multi-curvature shell structure of reinforced concrete method, these construction concrete steps comprise draw drawing, make build glass fiber reinforced plastic, construction plant cleaning, carry out unwrapping wire location according to set curvature and contour line data, set up bracing frame, set up thin shell structures bracing frame, make thin shell structures template, colligation housing reinforcing bar, fluid concrete and stripping bracing frame etc., the present invention adopts contouring method to coordinate control pair template to carry out decomposing the specification determining component glass fiber reinforced plastic, achieve and set up fast, saved the engineering time; Housing adopts bilateral glass steel form near base section, and carries out envelope mould with the gauze wire cloth at interval, while ensure that vertical bearing capacity, solves a difficult problem for heavy grade concrete construction, effectively solves the oblique thrust of structure to support body; In addition, adopt the cast of concrete segmentation symmetry in the present invention, make support system stress equalization, solve due to the constructional difficulties that housing area is large, the gradient is brought suddenly.

Description

Large span multi-curvature shell structure of reinforced concrete method
Technical field
The present invention relates to a kind of reinforced concrete construction method of thin shell structures of large span multi-curvature, particularly a kind of construction method of reinforced concrete structure of eggshell shape.
Background technology
Along with the enhancing of China's economic strength, people propose more and more higher requirement for the moulding of building, space.The accumulation that the development of building structure theory and major works are put into practice makes concrete structure form by plane rule, space is straight to spatial special, the development of handsome in appearance, high headroom.For spatial special structure, select rationally, the construction technology of security template supported design mode and advanced person is the key ensureing architecture quality effect.Large span, multi-curvature, the space structures of body complexity i.e. attractive in appearance but also air, more and more be subject to the favor of investors, but at present, although the construction technology of highrise building has reached higher level, but for this large span, multi-curvature, the space structures of body complexity, particularly monolithic reinforced concrete structure, the practice of prior art is also fewer, the construction method matched with it, technique also very imperfection, ripe, current multiselect glass fiber reinforced plastic is as the mould material of multi-curvature structure, but because Curvature varying is many, bracing frame set up vertical rod in process position location and Altitude control all face a difficult problem, because span is larger, the weight capacity of general glass steel formwork does not reach requirement, shell rim curvature is larger, concrete downslide problem is easily there is during pouring concrete, therefore, need a kind of cost at present badly reasonable, simple to operate, the large span multi-curvature shell structure of reinforced concrete method that feasibility is high.
Summary of the invention
The object of the invention is to provide a kind of large span multi-curvature shell structure of reinforced concrete method, solve for the difficult problem in large span multi-curvature shell structure of reinforced concrete in prior art, as built the problem identificatioin of glass fiber reinforced plastic specification, set up due to the branched support of Curvature varying the location, position of vertical rod in process and Altitude control all face a difficult problem, due to span comparatively large the weight capacity of the glass steel formwork problem that do not reach requirement and brought more greatly by shell rim curvature pouring concrete time easily there is concrete downslide problem etc.
For achieving the above object, the specific embodiments that the present invention adopts is:
A kind of large span multi-curvature shell structure of reinforced concrete method, is characterized in that:
Its construction concrete steps comprise:
Step one, drafting CAD construction drawing, and become 3D illustraton of model by rhinoceros Software on Drawing, draw full hall bracing frame vertical rod layout plan and housing isohypse perspective view simultaneously;
The component glass fiber reinforced plastic of step 2, making specific curvature: find the length of structure to be onstructed to central axis on described 3D illustraton of model, using length to central axis for baseline does the parallel lines of a series of spacing 1 ~ 3 meter as control line to both sides, adjacent two control lines and adjacent two isohypses are surrounded the specification of part and curvature data as the specification of glass fiber reinforced plastic after decomposing and curvature data, template producer according to must data creating component glass fiber reinforced plastic;
Step 3, construction plant cleaning;
Step 4, unwrapping wire are located: carry out measurement and unwrapping wire location to job site, the position of mark isohypse and vertical rod according to full hall bracing frame vertical rod layout plan and housing isohypse perspective view;
Step 5, set up full hall bracing frame: set up full hall bracing frame in the below of planning to build thin shell structures, adopt fastener that vertical rod and cross bar are connected into support body, the top of the vertical rod of bracing frame connects U holder, connect the steel tube framework identical with shell curvature on U holder, described U hold in the palm to add between steel tube framework timber wedge jam-pack steel pipe and U hold in the palm between gap;
Step 6, making thin shell structures template: first absolute altitude is the template line of demarcation of 1 ~ 2 meter high, and the part below template line of demarcation adopts bilateral glass steel form, namely sets up soffit formwork and top template simultaneously; Part more than template line of demarcation adopts one-sided glass steel formwork, namely only has soffit formwork; Adopt between the soffit formwork of the bilateral glass steel form of thin shell structures and top template drawing water-proof bolt to connect;
After step 7, model sheetinstallat complete directly in a template between assembling reinforcement, comprise according to determining curvature bending reinforcing steel bar, the dark beam steel of colligation housing and colligation shell plates reinforcing bar, between housing reinforcing bar, interception gauze wire cloth is set up at interval, tackles concrete and fall during pouring concrete;
Step 8, fluid concrete: adopt continuous stratification pouring procedure, every layer of cast THICKNESS CONTROL is within 450mm, the interval time of levels does not exceed the concrete initial setting time, first in the thick cement mortar identical with housing concrete mortar composition of bottom even cast 50mm before pouring concrete; When pouring into a mould bottom bilateral glass steel form part, adopt bilateral symmetry cutting mode; Also press polish of finally manually vibrating is wiped one's face, and housing is shaping;
Step 9, maintenance is carried out to the housing that concrete casting forms;
Step 10, dismounting thin shell structures bracing frame.
The concrete operations of setting up thin shell structures bracing frame in described step 5 are:
Step 1, on full hall bracing frame vertical rod layout plan, mark marked rod cloth set-point;
Step 2, according to marked rod arrangement diagram arrange marked rod;
Step 3, absolute altitude by adjacent marked rod span wire system determination intermediate uprights, carry out sawing to pole steel tube, make it highly meet the requirements;
Step 4, progressively set up vertical rod from the left and right sides toward centre;
Step 5, vertical rod top install U holder;
Step 6, vertical rod highly tested and calibrates;
Step 7, set up cross bar;
Step 8, the curvature of steel pipe along thin shell structures to be bent, make steel tube framework, make corresponding timber wedge simultaneously;
Step 9, steel tube framework is placed on frame top, asks colligation firm with iron wire and U, and links with cross bar 7 iron wire colligation, U holds in the palm and fill in timber wedge between steel tube framework, and bracing frame completes.
Wherein, marked rod not load-bearing in described step 3, the absolute altitude only carrying out vertical rod controls, with taking with tearing open, it is one group with every 4 ~ 8 row vertical rods in operation, after the vertical rod of first group has been set up, remove the marked rod being used for elevation control, then start to arrange next group marked rod, set up next group vertical rod.
In large span multi-curvature shell structure of reinforced concrete method operating procedure, the concrete operation step making thin shell structures template in described step 6 is:
Step 1, the template to be installed of all different curvature to be numbered according to position to be installed;
Step 2, be the mark template line of demarcation, place of 1 ~ 2 meter at body height, namely marking the isohypse of a certain height is template line of demarcation;
Step 3, to whole housing lifting glass fiber reinforced plastic bottom template: bed die is installed according to numbering from top to both sides, and must ensure that piece is tight, sponge strip is pasted at formwork edge joint place, and the piece proprietary material between template smears sealing, with mortar leakage prevention;
Step 4, with lower part prepared by housing glass fiber reinforced plastic top template to template line of demarcation: in template line of demarcation with lower part, one deck glass fiber reinforced plastic is added again at completed one-sided glass fiber reinforced plastic lateral surface, becoming bilateral glass steel form, adopting drawing water-proof bolt to connect between the soffit formwork of bilateral glass steel form and top template;
Step 5, template to be corrected: must check work after template construction, reaching requirement can fluid concrete.
As the preferred version in large span multi-curvature shell structure of reinforced concrete method operating procedure, to drawing the both sides of water-proof bolt to be welded with steel bar end as shoring in described step 6.
As the preferred version in large span multi-curvature shell structure of reinforced concrete method operating procedure, to the plug drawing the two ends of water-proof bolt to be installed with the truncated cone-shaped of anti-slurry effect in described step 6, the clear spacing of two plugs is the thick thickness deducting twice plug of shell, plug is taken out after pouring concrete is complete, wall will leave arc pit, the higher leveled waterproofing mortar filling of pit label.
As the preferred version in large span multi-curvature shell structure of reinforced concrete method operating procedure, described in step 6, the sagittal edge of soffit formwork arranges flange, and flange height is identical with the thickness of housing.
Compared with prior art, advantage of the present invention is: the present invention adopts contouring method to coordinate control pair template to carry out decomposing the specification determining component glass fiber reinforced plastic, realize unifying thus setting up fast of vertical rod position and height in bracing frame fast simultaneously, save the engineering time; Adopt the closed template of bilateral at housing near base section, ensure that vertical bearing capacity; When reinforced-bar binding, the gauze wire cloth at interval carries out envelope mould, solves a difficult problem for heavy grade concrete construction, effectively solves the oblique thrust of structure to support body, well solves the cold seam problem in prior art construction; In addition, adopt the cast of concrete segmentation symmetry in the present invention, make support system stress equalization, solve due to the constructional difficulties that housing area is large, the gradient is brought suddenly.
Accompanying drawing explanation
Fig. 1 is the construction process figure of large span multi-curvature shell structure of reinforced concrete method of the present invention;
Fig. 2 is that vertical rod in embodiment of the present invention eggshell shape structure of reinforced concrete and isohypse arrange schematic diagram;
Fig. 3 is formwork structure schematic diagram in the structure of reinforced concrete of embodiment of the present invention eggshell shape;
Fig. 4 is the structural representation of the reinforced concrete structure of embodiment of the present invention eggshell shape.
Reference numeral: 1-bilateral glass steel form, 2-tackle gauze wire cloth to drawing muscle, 14-top muscle, 15-soffit formwork, 16-top template, 17-bottom water-proof bolt, 3-sealing piece, 4-steel tube framework, 5-timber wedge, 6-U holder, 7-cross bar, 8-vertical rod, 9-housing, 10-template line of demarcation, 11-isohypse, the one-sided glass steel formwork of 12-, 13-.
Detailed description of the invention
The reinforced concrete structure of eggshell shape involved by the embodiment of the present invention is the exterior trim structure at gate, the all around equal ground connection of this eggshell shape exterior trim structure, side, front and back has corresponding arch door opening, the reinforced concrete structure of this eggshell shape designs according to reasonable using period for 50 years, the safe class of building structure is secondary, seismic fortification intensity is 8 degree, as shown in Figure 4, the shell top mark height of the structural representation of the reinforced concrete structure of eggshell shape of the present invention is 4.45m, housing span reaches 42m, larger, body structure surface Curvature varying is various and irregular, stencil design is made to there is larger difficulty with construction.
Fig. 1 is the construction process figure of large span multi-curvature shell structure of reinforced concrete method of the present invention, and concrete construction method is as follows:
1 draws construction drawing
By rhinoceros Software on Drawing 3D illustraton of model, draw full hall bracing frame vertical rod 8 layout plan and housing isohypse perspective view simultaneously;
The component glass fiber reinforced plastic of 2 making specific curvature
Concrete steps are as follows:
1) structure length is found out to central axis and isohypse;
2) be that baseline does parallel lines to both sides spacing 2m, as control line with central axis;
3) be that benchmark does vertical cutting plane to structural model with control line, cutting plane two camber lines crossing with structure are bottom line and the top line of structure;
4) region folded by two adjacent control wires and two adjacent contours is the template model of decomposition, and the intersection point data of four lines are the data at four angles of template;
5) the concrete data of every block template can be determined according to the characteristic of isohypse and control line.
6) according to the data obtained, template producer produces sizing glass steel formwork
3 construction plant cleanings
Before construction, the land clearing for setting up bracing frame is clean, smooth to make its uniform force under bracing frame backing plate should be ensured.
4 according to set curvature and isohypse 11 data and unwrapping wire locate
Fig. 2 is that vertical rod in the structure of reinforced concrete method of embodiment of the present invention eggshell shape and isohypse arrange schematic diagram; Fig. 3 is the structural representation of the template in the structure of reinforced concrete method of embodiment of the present invention eggshell shape; Computer model construction simulation technology is passed through early stage in engineering in the present embodiment, obtain curvature and isocontour concrete data and both combine and obtain the design value of template, first full hall bracing frame vertical rod 8 layout plan and isohypse floor map is drawn in construction, according to figure, measurement is carried out and unwrapping wire location to job site, the position of mark isohypse 11 and vertical rod 8.
5 set up bracing frame
Set up bracing frame: on basement roof, set up fence operation frame, handling frame is arranged around gate, vertical rod 8 advance 1500mm, array pitch 1000mm, step pitch 1200mm, adds safe blanket net, close order safety net and baseboard.Guard rail adopts three road railing forms, and bar of sweeping the floor is apart from scope of operation height 50mm, the liftoff 500mm of middle road railing, and upper track railing is liftoff 1500, highly exceeds operating surface and is not less than 1500mm.
6 set up thin shell structures bracing frame
The technical data of bracing frame: bracing frame adopts steel tubular support with couplers system, vertical rod 8 in length and breadth spacing all should be not more than 950mm, step pitch is 1200mm, 300mm, all support, top employing U holder 6 that cross bar first is liftoff, steel tube framework 4 is on U holder 6, timber wedge jam-pack is had in the middle of both, the short flitch of 50 × 100mm can be adopted bottom all vertical rods 8 to make chock, and length is not less than 400mm, chock unified for steel tube framework 4 in the same way.Top braces point is not more than 300mm to the spacing going up most one cross bar 7.The cross bar of bracing frame should hold out against on two side templates of subsequent installation, to prevent horizontal movement.
Bracing frame specifically set up step: on full hall bracing frame vertical rod layout plan, mark marked rod cloth set-point → by the absolute altitude of adjacent marked rod span wire system determination intermediate uprights 8, sawing is carried out to pole steel tube, make its vertical rod 8 of highly meeting the requirements → progressively set up from the left and right sides toward centre → at vertical rod 8 top arrange U holder 6 → to vertical rod 8 highly test and calibrate → set up the cross bar 7 → curvature of steel pipe along thin shell structures bent, make steel tube framework 4, make corresponding timber wedge 5 → install and ask colligation firm along steel tube framework 4 iron wire and U simultaneously, and link with cross bar 7 iron wire colligation, timber wedge 5 is filled between U holder and steel tube framework 4, bracing frame completes.
Gate structure span is comparatively large, and is irregular eggshell type housing 9, and body structure surface Curvature varying is various and irregular, and therefore the location survey setting-out work at gate is the most important thing ensureing whole engineering construction quality; Gate isohypse 11 projection line belongs to irregular camber line, and surveyor pointwise can only carry out unwrapping wire, then carries out line, gate shell structure span reaches 42 meters, need isohypse 11 subpoint of surveying setting-out more, workload is very big, needs a large amount of survey crew to carry out coordinating operation; Surveyor needs the layout net of releasing form bracing system in structure roof, and all bracing frame vertical rods 8 all need position mark in structure roof, and workload is comparatively large, needs a large amount of survey crew coordinating operation; Scaffolder sets up cross bar 7 according to cross bar 7 step pitch, when the altitude range to designing requirement is set up in vertical rod 8, is controlled by adjacent marked rod bracing wire, overlaps an adjustable U holder 6, and be adjusted to design elevation on vertical rod 8 top; Bracing frame is set up from the left and right sides, gate toward centre, marked rod not load-bearing, should control with taking with tearing open with vertical rod 8 absolute altitude; Be one group with every five row vertical rods 8, when the five row vertical rods 8 of first group are set up to design elevation, remove the marked rod being used for elevation control, then start to arrange second group of marked rod, set up second group of vertical rod 8, the rest may be inferred; Due to structural span, structural curvature is less, and reinforcing bar length is 9-12m, therefore artificial bending can be adopted to get final product colligation along template curved surface.
7 make thin shell structures template
The top template 16 of thin shell structures template and soffit formwork 15 all adopt modular glass steel form, first absolute altitude is the template line of demarcation 10 of 1.350 meters high, the part in template line of demarcation less than 10 arranges soffit formwork 15 and top template 16, the part in template line of demarcation more than 10 only arranges soffit formwork 15, adopt A14 to drawing water-proof bolt between top template 16 and soffit formwork 15, to the vertical spacing 350mm drawing water-proof bolt, horizontal spacing is 600mm, bolt will be welded with sealing piece 3, sealing up screw both sides are welded with 50mm A14 steel bar end as shoring, 25mm thick truncated cone-shaped plug is put on as anti-slurry cap at the two ends of screw rod during envelope mould.The complete rear taking-up plug of pouring concrete, wall will leave arc pit, the higher leveled waterproofing mortar filling of pit label.
Specific construction step is: be first numbered according to position to be installed the template to be installed of all different curvature; In the mark template line of demarcation 10, place that housing 9 is highly 1.35 meters, the isohypse namely marking a certain height is template line of demarcation 10; Lift soffit formwork 15 to whole housing 9: template is installed according to numbering from top to both sides, must ensure that piece is tight, sponge strip is pasted at formwork edge joint place, and the piece proprietary material between template smears sealing, with mortar leakage prevention; With lower part, housing 9 top template 16 is set up to template line of demarcation 10; Correct template: must check work after template construction, reaching requirement can fluid concrete.Before and after housing 9, the bed die at edge should arrange flange in structural edge side, and flange height is with structural slab thickness.
Template specialized factory and technician carry out the configuration design of formwork and formwork supports system, draw template Pareto diagram, be numbered processing install all templates; Pertinent templates support, arrangement, sequence of construction and assembly and disassembly methods, section chief must tell somebody what one's real intentions are in detail to teams and groups personnel; The template and accessory of transporting to scene should successively be checked by specification, quantity and be checked, do not meet must not using of quality requirement; Template is classified and parallel stacking at the scene by number, applies wooden unit pad and opens, prevent template compressive deformation between upper and lower block template; The root outboard template of housing 9 must could matched moulds after steel corrosion quantity, processes, remove all disintegrating slags, prevent rotten before matched moulds to concrete structure construction seam; Template splicing ensures that piece is tight, and sponge strip is pasted at formwork edge joint place, and with mortar leakage prevention, must carry out after template construction checking work, reaching requirement can fluid concrete.
The colligation of 8 housing reinforcing bars
8.1 shell foundation beam steel rust cleaning
Job site reinforcing bar is owing to exposing for a long time, and its surface produces floating rust in various degree, for meeting design and construction code requirement, need carry out processing of rust removing, to ensure the construction quality of object of construction production to this part reinforcing bar.
Float the difference of rust situation according to reinforcing bar, mainly take following two schemes:
1) many to floating rust reinforcing bars, take rust remover to carry out the method removed;
2) few to floating rust reinforcing bar, takes steel brush to carry out the method removed.
8.2 steel bar meter
Reinforcing bar is responsible for turning over sample by construction corps arrangement of reinforcement person, sets up reinforcing steel processing shed at the construction field (site), and all reinforcing bars are processed at the construction field (site) and bent.
The colligation of the dark beam steel of the dark beam of 8.3 shell rim and base
Be familiar with drawing, cleaning material list → arrange reinforcing bar used → cleaning operation face → reinforcing bar has bad luck the beam stirrup spacing that puts in place → draw → put beam stirrup → wear beam bottom and indulges that muscle → wear back layer indulges muscle → adjustment thickness of protection tier and spacing → inspection reinforcement cover, whether reinforcement location meets the requirements → site clearing facility and waste material.
8.4 shell plates reinforcing bar bindings
Be familiar with drawing, check material list → arrange reinforcing bar used → cleaning template → have bad luck the bottom muscle 13 of putting in place → tie up → tie up top muscle 14 → adjust thickness of protection tier and spacing → inspection reinforcement cover at mould lining out → reinforcing bar, whether reinforcement location meet the requirements → site clearing facility and waste material.Before assembling reinforcement, template face must figure brush interleaving agent, the specification of priority control reinforcing bar, the thickness, split heads iron size, wall column reinforcing bar positioning bar, embedded iron parts etc. of concrete pad in preparation.
9 concrete cast
The concrete strength grade of this shell structure is C30, and the particle diameter of concrete aggregate must not be greater than minimal protective cover thickness.During cast, poured into a mould to centre from the left and right sides, gate by an automotive pump.
Concrete discharging point position and vibrator operating personnel quantity are presetted.First in the thick cement mortar identical with the concrete mortar composition of housing of bottom even cast 50mm before pouring concrete.Concrete wants continuous stratification to pour into a mould, every layer of cast THICKNESS CONTROL is within 450mm, after vibration compacting, from first blanking again cloth, the interval time of levels does not exceed the concrete initial setting time, should determine according to situations such as the on-site concrete slump, weather condition, concrete retarding times, general control should not be greater than 1.5h, adopts and manually vibrates, repeatedly plug and pound with B20 reinforcing bar, employment work point makes real for twice again, and last artificial press polish is wiped one's face.Because housing 9 is eggshell shape sloped roof, within the scope of cast one side formwork, namely absolute altitude is that 1.35m is with upper part, during housing 9 concrete, topple over to lower for preventing concrete, the concrete slump within the scope of this is strict controlled in 140 ± 10mm, and simultaneously on housing 9 reinforcing bar, every 3m establishes one gauze wire cloth to tackle concrete.Bottom lock formula template part adopts A50 vibrating spear to water and smashes, bilateral symmetry blanking.
For controlling housing 9 body structure surface absolute altitude, before fluid concrete, in the range of structures of one side formwork, weld a steel bar end along isohypse 11 every 2m, can not welding on principal rod, the absolute altitude of steel bar end is identical with the absolute altitude of housing 9 structural plane.In concrete placement, send special messenger to nurse template, check the support situation of template at any time.Can not be converged blanking in beam slab concrete placement, also must not pile up a large amount of concrete in a place, should adopt symmetrical mode fluid concrete of jumping storehouse, keep even blanking, avoids making a large amount of Load concentration a bit, cause local buckling.
10 carry out concrete curing after remove thin shell structures bracing frame
Form removal can be started when concrete strength reaches 100% design strength.Should from top to bottom by number, block-by-block remove, forbid upper and lower both sides to be removed simultaneously.Dismounting order: remove top template 16 glass fiber reinforced plastic → downward U and hold in the palm 6 → dismounting soffit formwork 15 glass fiber reinforced plastic → dismounting support system bracing frame.
(1) before reinforcing bar binding, section chief tackles construction corps and carries out written confiding a technological secret, and after carrying out further telling somebody what one's real intentions are in detail to operation team, can arrange construction.Specify on-the-spot specific requirement: snap the line, reinforcing bar control line edges of boards first reinforcing bar distance beam limit concrete 50mm etc., steel bar horse-shaped bench spacing, method for binding reinforcing steel bars, reinforcing bar binding order, different parts pad thickness, reinforcing bar binding obtain allowable variation etc.
(2) before assembling reinforcement, template face must figure brush interleaving agent, the preparation of some necessity must be handled properly, the diameter of priority control reinforcing bar, specification, the thickness, split heads iron size, wall column reinforcing bar positioning bar, embedded iron parts etc. of concrete pad.
(3) construction period structurally overburden must not stack building materials and construction rubbish.
The Engineering Quality Control of 11 large span multi-curvature shell steel concrete
Model sheetinstallat must ensure that position is accurate, and formwork edge joint is tight, and support system is solid and reliable, does not deform and displacement.After model sheetinstallat, survey crew reply template position, verticality, absolute altitude, position etc. that is pre-buried and hole to be provided check.The allowable variation of thin shell structures template should meet and specifies with following table 1; During reinforcement installation; the kind of steel bar stress, rank, specification and quantity must meet designing requirement; exhaustive test is carried out by observation or steel ruler inspection during inspection; when checking built-in fitting position of center line; along both direction measurement in length and breadth, and should get higher value wherein, the rate of conformity points of beam class, plate class A of geometric unitA top Reinforcement protective layer thickness should reach more than 90%; and the dimensional errors exceeding table 2 or table 3 numerical value 1.5 times must not be had, table 4 is workmanship requirements of pouring concrete.

Claims (7)

1. a large span multi-curvature shell structure of reinforced concrete method, is characterized in that:
Its Specific construction step comprises:
Step one, drafting construction drawing: draw construction drawing, and become 3D illustraton of model by rhinoceros Software on Drawing, draw full hall bracing frame vertical rod (8) layout plan and housing isohypse perspective view simultaneously;
The component glass fiber reinforced plastic of step 2, making specific curvature: find the length of structure to be onstructed to central axis on described 3D illustraton of model, using length to central axis for baseline does the parallel lines of a series of spacing 1 ~ 3 meter as control line to both sides, adjacent two control lines and adjacent two isohypses (11) are surrounded the specification of part and curvature data as the specification of glass fiber reinforced plastic after decomposing and curvature data, template producer according to must data creating component glass fiber reinforced plastic;
Step 3, construction plant cleaning;
Step 4, unwrapping wire are located: carry out measurement and unwrapping wire location to job site, the position of mark isohypse (11) and vertical rod (8) according to full hall bracing frame vertical rod (8) layout plan and housing isohypse perspective view;
Step 5, set up full hall bracing frame: set up full hall bracing frame in the below of planning to build thin shell structures, adopt fastener that vertical rod (8) and cross bar (7) are connected into support body, the top of the vertical rod (8) of bracing frame connects U holder (6), connect the steel tube framework (4) identical with shell curvature on U holder (6), described U hold in the palm to add between (6) and steel tube framework (4) timber wedge (5) jam-pack steel pipe and U hold in the palm between gap;
Step 6, making thin shell structures template: first absolute altitude is the template line of demarcation (10) of 1 ~ 2 meter high, and template line of demarcation (10) part below adopts bilateral glass steel form (1), namely sets up soffit formwork (15) and top template (16) simultaneously; Part more than template line of demarcation (10) adopts one-sided glass steel formwork (12), namely only has soffit formwork (15); Adopt drawing water-proof bolt (2) to connect between the soffit formwork (15) of the bilateral glass steel form (1) of thin shell structures and top template (16);
After step 7, model sheetinstallat complete directly in a template between assembling reinforcement, comprise according to determining curvature bending reinforcing steel bar, the dark beam steel of colligation housing and colligation shell plates reinforcing bar, between housing reinforcing bar, interception gauze wire cloth (17) is set up at interval, tackles concrete and fall during pouring concrete;
Step 8, fluid concrete: adopt continuous stratification pouring procedure, every layer of cast THICKNESS CONTROL is within 450mm, the interval time of levels does not exceed the concrete initial setting time, first in the thick cement mortar identical with housing concrete mortar composition of bottom even cast 50mm before pouring concrete; When pouring into a mould bottom bilateral glass steel form (1) part, adopt bilateral symmetry cutting mode; Also press polish of finally manually vibrating is wiped one's face, and housing (9) is shaping;
Step 9, maintenance is carried out to the housing (9) that concrete casting forms;
Step 10, dismounting thin shell structures bracing frame.
2. a kind of large span multi-curvature shell structure of reinforced concrete method according to claim 1, is characterized in that: the concrete operations of setting up thin shell structures bracing frame in described step 5 are:
Step 1, on full hall bracing frame vertical rod (8) layout plan, mark marked rod cloth set-point;
Step 2, according to marked rod arrangement diagram arrange marked rod;
Step 3, absolute altitude by adjacent marked rod span wire system determination intermediate uprights, carry out sawing to pole steel tube, make it highly meet the requirements;
Step 4, progressively set up vertical rod (8) from the left and right sides toward centre;
Step 5, vertical rod (8) top install U holder (6);
Step 6, vertical rod (8) is highly tested and calibrated;
Step 7, set up cross bar (7);
Step 8, the curvature of steel pipe along thin shell structures to be bent, make steel tube framework (4), make corresponding timber wedge (5) simultaneously;
Step 9, steel tube framework (4) is placed on frame top, asks (6) colligation firm with iron wire and U, and links with cross bar 7 iron wire colligation, U holds in the palm between (6) and steel tube framework (4) and fills in timber wedge (5), and bracing frame completes.
3. a kind of large span multi-curvature shell structure of reinforced concrete method according to claim 2, it is characterized in that: marked rod not load-bearing in described step 3, the absolute altitude only carrying out vertical rod (8) controls, with taking with tearing open, be one group with every 4 ~ 8 row vertical rods in operation, after the vertical rod of first group has been set up, remove the marked rod being used for elevation control, then start to arrange next group marked rod, set up next group vertical rod (8).
4. a kind of large span multi-curvature shell structure of reinforced concrete method according to claim 1, is characterized in that: the concrete operation step making thin shell structures template in described step 6 is:
Step 1, the template to be installed of all different curvature to be numbered according to position to be installed;
Step 2, be highly place mark template line of demarcation (10) of 1 ~ 2 meter at housing (9), namely marking the isohypse of a certain height is template line of demarcation (10);
Step 3, to whole housing (9) lifting glass fiber reinforced plastic bottom template (15): bed die is installed according to numbering from top to both sides, must ensure that piece is tight, sponge strip is pasted at formwork edge joint place, and the piece proprietary material between template smears sealing, with mortar leakage prevention;
Step 4, with lower part prepared by housing (9) glass fiber reinforced plastic top template (16) to template line of demarcation (10): in template line of demarcation (10) with lower part, one deck glass fiber reinforced plastic is added again at completed one-sided glass fiber reinforced plastic lateral surface, becoming bilateral glass steel form (1), adopting drawing water-proof bolt (2) to connect between the soffit formwork (15) of bilateral glass steel form and top template (16);
Step 5, template to be corrected: must check work after template construction, reaching requirement can fluid concrete.
5. a kind of large span multi-curvature shell structure of reinforced concrete method according to claim 1, is characterized in that: to drawing the both sides of water-proof bolt (2) to be welded with steel bar end as shoring in described step 6.
6. a kind of large span multi-curvature shell structure of reinforced concrete method according to claim 1, it is characterized in that: to the plug drawing the two ends of water-proof bolt (2) to be installed with the truncated cone-shaped of anti-slurry effect in described step 6, the clear spacing of two plugs is the thick thickness deducting twice plug of housing, plug is taken out after pouring concrete is complete, housing will leave arc pit, the higher leveled waterproofing mortar filling of pit label.
7. a kind of large span multi-curvature shell structure of reinforced concrete method according to claim 1, it is characterized in that: described in step 6, the sagittal edge of soffit formwork (15) arranges flange, the thickness of the same housing of flange height (9) is identical.
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