CN103590603A - Large-span multi-curvature thin shell reinforced concrete structure construction method - Google Patents
Large-span multi-curvature thin shell reinforced concrete structure construction method Download PDFInfo
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- CN103590603A CN103590603A CN201310564950.2A CN201310564950A CN103590603A CN 103590603 A CN103590603 A CN 103590603A CN 201310564950 A CN201310564950 A CN 201310564950A CN 103590603 A CN103590603 A CN 103590603A
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Abstract
A large-span multi-curvature thin shell reinforced concrete structure construction method specifically includes the steps of making drawings, manufacturing and building glass fiber reinforced plastics, cleaning a construction site, carrying out paying-off positioning according to an established curvature and contour line data, setting up supporting frames, setting up thin shell structured supporting frames, manufacturing thin shell structured formworks, binding shell reinforcing steel bars, pouring concrete, dismounting formwork supporting frames and the like. According to the construction method, a contour line mode is adopted to carry out disassembling on the formworks by being coordinated with a control line, so rapid erection is achieved and the construction time is saved. The portion, close to the bottom of a shell is made of dual-side glass fiber reinforced plastic formworks, and formwork sealing is carried out by using steel wire gauze arranged at intervals, so vertical bearing capacity is guaranteed, the problem in large-gradient concrete construction is solved, and the slanting thrust of the structure on frame bodies is removed effectively. In addition, concrete subsection symmetrical pouring is adopted, so the stress of a supporting system can be balanced, and the problem of difficult construction caused by big shell size and steep gradient can be solved.
Description
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 job practices of reinforced concrete structure of eggshell shape.
Background technology
Along with the enhancing of China's economic strength, people have proposed more and more higher requirement for moulding, the space of building.The accumulation of the development of building structure theory and major works practice makes concrete structure pattern develop to spatial special, handsome in appearance, high headroom by plane is regular, space is straight.For spatial special structure, select rationally, security template supported design mode and advanced construction technology be the key that guarantees architecture quality effect.Large span, multi-curvature, the space structures of body complexity is atmosphere again attractive in appearance, more and more receive investors' favor, 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, monolithic reinforced concrete structure particularly, the practice of prior art is also fewer, the job practices matching with it, technique is imperfection very also, ripe, multiselect uses glass fiber reinforced plastic as the mould material of multi-curvature structure at present, but because curvature changes many, bracing frame is set up the location, position of vertical rod in process and is highly controlled and 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, during pouring concrete, be prone to concrete downslide problem, therefore, need at present a kind of cost 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 to solve in prior art for the difficult problem in large span multi-curvature shell structure of reinforced concrete, as build the problem identificatioin of glass fiber reinforced plastic specification, due to curvature change branched support set up the location, position of vertical rod in process and highly control all face a difficult problem, due to span greatly the weight capacity of glass steel formwork do not reach the problem of requirement and by shell rim curvature, brought more greatly pouring concrete time be prone to concrete downslide problem etc.
For achieving the above object, the specific embodiments that the present invention adopts is:
A multi-curvature shell structure of reinforced concrete method, is characterized in that:
Its construction concrete steps comprise:
Step 1, 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 member 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 long parallel lines from baseline to both sides that do 1～3 meter of a series of spacing to central axis as control line, adjacent two control lines and adjacent two isohypses are surrounded to the specification of part and specification and the curvature data of the glass fiber reinforced plastic of curvature data after decomposing, and template producer is according to the data creating member glass fiber reinforced plastic having obtained;
Step 3, construction plant cleaning;
Step 4, unwrapping wire location: also unwrapping wire location, the position of mark isohypse and vertical rod are measured in job site according to full hall bracing frame vertical rod layout plan and housing isohypse perspective view;
Step 5, set up full hall bracing frame: plan to build thin shell structures below set up full hall bracing frame, 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, on U holder, connect the steel tube framework identical with shell curvature, between described U holder and steel tube framework, add the gap between timber wedge jam-pack steel pipe and U holder;
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, sets up soffit formwork and top template simultaneously; Part more than template line of demarcation adopts one-sided glass steel formwork, only has soffit formwork; Between the soffit formwork of the bilateral glass steel form of thin shell structures and top template, adopt drawing water-proof bolt to connect;
Directly assembling reinforcement in the middle of template after step 7, template installation, 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 during pouring concrete;
The concrete operations of setting up thin shell structures bracing frame in described step 4 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, by adjacent marked rod span wire system, determine in the middle of the absolute altitude of vertical rod, pole steel tube is carried out to sawing, it is highly met the requirements;
Step 4, from the left and right sides toward centre, progressively set up vertical rod;
Step 5, U holder is installed at vertical rod top;
Step 6, vertical rod is highly tested and calibrated;
Wherein, not load-bearing of marked rod in described step 3, only carries out the absolute altitude of vertical rod and controls, with taking with tearing open, every 4～8 row vertical rods of take in operation are one group, after the vertical rod of first group has been set up, remove the marked rod 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 of making thin shell structures template in described step 5 is:
Step 1, the template to be installed of all different curvature is numbered according to position to be installed;
Step 2, the place that is 1～2 meter at housing height mark template line of demarcation, and the isohypse that marks 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 to both sides from top, must guarantee that piece is tight, and sponge strip is pasted at formwork edge joint place, and the piece between template is smeared sealing with proprietary material, with mortar leakage prevention;
Step 4, the following part in template line of demarcation is prepared to housing glass fiber reinforced plastic top template: in the following part in template line of demarcation, at completed one-sided glass fiber reinforced plastic lateral surface, add again one deck glass fiber reinforced plastic, become bilateral glass steel form, between the soffit formwork of bilateral glass steel form and top template, adopt drawing water-proof bolt to connect;
Step 5, template is proofreaied and correct: after template construction, must check work, reaching requirement can fluid concrete.
As the preferred version in large span multi-curvature shell structure of reinforced concrete method operating procedure, in described step 5 to drawing the both sides of sealing up screw to be welded with steel bar end as shoring.
As the preferred version in large span multi-curvature shell structure of reinforced concrete method operating procedure, in described step 5 to drawing the two ends of sealing up screw to be installed with the truncated cone-shaped plug of anti-slurry effect, it is thick that plug clear spacing is that wall thickness deducts twice tampion, after pouring concrete is complete, take out plug, on wall, will leave arc pit, the waterproofing mortar filling of a high label for pit.
Preferred version as in large span multi-curvature shell structure of reinforced concrete method operating procedure, arranges flange at the sagittal edge of soffit formwork described in step 5, 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 decompose the specification of determining member glass fiber reinforced plastic, thereby realize fast simultaneously vertical rod position and height in bracing frame unify set up fast, saved the engineering time; At housing, near base section, adopt the closed template of bilateral, guaranteed vertical bearing capacity; Gauze wire cloth with interval when reinforced-bar binding seals mould, has solved a difficult problem for heavy grade concrete construction, has effectively solved the oblique thrust of structure to support body, has well solved the cold seam problem in prior art construction; In addition, in the present invention, adopt the symmetrical cast of concrete segmentation, make support system stress equalization, solved the constructional difficulties because 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 and the isohypse in embodiment of the present invention eggshell shape structure of reinforced concrete arranged 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-are to drawing 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, 12 one-sided glass steel formworks, 13-bottom muscle, 14-top muscle, 15-soffit formwork, 16-top template, 17-to tackle gauze wire cloth.
The specific embodiment
The exterior trim structure that the reinforced concrete structure of the related eggshell shape of the embodiment of the present invention is gate, the all around equal ground connection of this eggshell shape exterior trim structure, front and back side 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 changes various and irregular, make stencil design and construction have larger difficulty.
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 plans and housing isohypse perspective view simultaneously;
2 make the member glass fiber reinforced plastic of specific curvature
Concrete steps are as follows:
1) find out structure length to central axis and isohypse;
2) take central axis does parallel lines to both sides spacing 2m as baseline, as control line;
3) take control line does vertical cutting plane to structural model as benchmark, and two camber lines that cutting plane and structure intersect are bottom line and the top line of structure;
4) two adjacent control lines and two folded regions of adjacent contour are the template model of decomposition, and the intersection point data of four lines are the data at four angles of template;
5) according to the characteristic of isohypse and control line, can determine the concrete data of every template.
6) according to the data that obtained, template producer produces sizing glass steel formwork
3 construction plant cleanings
Before construction, the land clearing of wanting to set up bracing frame is clean, should guarantee under bracing frame backing plate smooth so that it is stressed evenly.
4 according to set curvature and isohypse 11 data unwrapping wire location
Fig. 2 is that vertical rod and the isohypse in the structure of reinforced concrete method of embodiment of the present invention eggshell shape arranged 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; In the present embodiment, in engineering, in earlier stage passed through computer model construction simulation technology, also both combine and obtain the design value of template to obtain curvature and isocontour concrete data, in construction, first draw full hall bracing frame vertical rod 8 layout plans and isohypse floor map, according to figure, job site is measured and unwrapping wire location 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 arranges along gate around, 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 the bar of sweeping the floor is apart from the liftoff 500mm of scope of operation height 50mm ，Zhong 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, cross bar first is liftoff 300mm, all support, top adopt U holder 6, and steel tube framework 4 is on U holder 6, in the middle of both, there is timber wedge jam-pack, all vertical rods 8 bottoms can adopt the short flitch of 50 * 100mm to make chock, and length is not less than 400mm, chock unified for steel tube framework 4 in the same way.Top braces is put the spacing that goes up one cross bar 7 most and is not more than 300mm.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: mark marked rod cloth set-point on full hall bracing frame vertical rod layout plan → determine by the adjacent marked rod span wire system absolute altitude of centre vertical rod 8, pole steel tube is carried out to sawing, make its highly meet the requirements → from the left and right sides toward middle, progressively set up vertical rod 8 → arrange at vertical rod 8 tops U holder 6 → vertical rod 8 is highly tested and calibrated → set up cross bar 7 → steel pipe is carried out to bending along the curvature of thin shell structures, make steel tube framework 4, make corresponding timber wedge 5 → installation firm along steel tube framework 4 use iron wires and U holder colligation simultaneously, and link with cross bar 7 use iron wire colligations, between U holder and steel tube framework 4, fill in timber wedge 5, bracing frame completes.
Gate structure span is larger, and is irregular eggshell type housing 9, and body structure surface curvature changes various and irregular, so the location survey setting-out work at gate is the most important thing that guarantees whole engineering construction quality; Isohypse 11 projection lines in gate belong to irregular camber line, and surveyor can only pointwise carry out unwrapping wire, then carries out line, gate shell structure span reaches 42 meters, isohypse 11 subpoints that need to measure unwrapping wire are more, and workload is very big, need a large amount of survey crews to carry out coordinating operation; Surveyor need to emit the layout net of form bracing system in structure roof, and all bracing frame vertical rods 8 all need position mark in structure roof, and workload is larger, needs a large amount of survey crew coordinating operations; Scaffolder sets up cross bar 7 according to cross bar 7 step pitches, when vertical rod 8 is set up to the altitude range of designing requirement, by adjacent marked rod bracing wire, controls, and overlaps an adjustable U holder 6, and be adjusted to design elevation on vertical rod 8 tops; Bracing frame is set up toward centre from the left and right sides, gate, and not load-bearing of marked rod should be controlled with taking with tearing open with vertical rod 8 absolute altitudes; Every five row vertical rods 8 of take are one group, when the five row vertical rods 8 of first group are set up to design elevation, remove the marked rod for elevation control, then start to arrange second group of marked rod, set up second group of vertical rod 8, and the rest may be inferred; Due to structural span, structure curvature is less, and reinforcing bar length is 9-12m, therefore can adopt artificial bending to get final product colligation along template curved surface.
7 make thin shell structures template
Specific construction step is: first the template to be installed of all different curvature is numbered according to position to be installed; At housing 9, be highly the mark template line of demarcation 10, place of 1.35 meters, the isohypse that marks a certain height is template line of demarcation 10; Whole housing 9 is lifted to bottom glass steel forms 15: template is installed according to numbering to both sides from top, must guarantee that piece is tight, sponge strip is pasted at formwork edge joint place, and the piece between template is smeared sealing with proprietary material, with mortar leakage prevention; Template line of demarcation part below 10 is set up to housing 9 backforms 16; Template is proofreaied and correct: after template construction, must check work, reaching requirement can fluid concrete.The bed die at housing 9 edges, front and back should arrange flange in structural edge one side, flange height isostructure plate thickness.
Template specialized factory and technician carry out the configuration design of formwork and formwork supports system, draw template Pareto diagram, all templates are numbered to processing and install; About shuttering supporting, arrangement, sequence of construction and assembly and disassembly methods, section chief must tell somebody what one's real intentions are in detail to the personnel of teams and groups; To transporting to on-the-spot template and accessory, should successively check and check by specification, quantity, not meet must not using of quality requirement; Template is classification parallel stacking by number at the scene, applies wooden unit pad and open between upper and lower piece template, prevents template compressive deformation; The root outboard template of housing 9 must be after reinforcing bar be checked and accepted could matched moulds, before matched moulds, concrete structure construction seam is processed, remove all disintegrating slags, prevent rotten; Template splicing guarantees that piece is tight, and sponge strip is pasted at formwork edge joint place, with mortar leakage prevention, after template construction, must check work, and 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 this part reinforcing bar, to guarantee the construction quality of object of construction production.
According to the difference of the floating rust situation of reinforcing bar, mainly take following two schemes:
1) to the many reinforcing bars of floating rust, the method for taking rust remover to remove;
2) to the few reinforcing bar of floating rust, the method for taking steel brush to remove.
8.2 reinforcing bar processing
Reinforcing bar is responsible for turning over sample by the arrangement of reinforcement person of construction corps, sets up at the construction field (site) reinforcing steel processing shed, and all reinforcing bars are processed and bent at the construction field (site).
The colligation of the dark beam of 8.3 shell rim and the dark beam steel in base
Be familiar with drawing, cleaning material list → arrange reinforcing bar → cleaning operation face → reinforcing bar used is had bad luck the beam stirrup spacing that puts in place → draw → put beam stirrup → the wear vertical muscle of beam bottom → wear back layer to indulge muscle → adjustment thickness of protection tier and spacing → inspection reinforcement cover, reinforcement location whether meet 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 → cleaning template used → mould lining out → reinforcing bar have bad luck put in place → tie up bottom muscle 13 → tie up top muscle 14 → adjustment thickness of protection tier and spacing → inspection reinforcement cover, reinforcement location whether meet the requirements → site clearing facility and waste material.Before assembling reinforcement, template face must scheme to brush interleaving agent, and the specification of priority control reinforcing bar in preparation is, thickness of concrete pad, split heads iron size, wall column reinforcing bar positioning bar, embedded iron parts etc.
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 layer thickness.During cast, by an automotive pump, from the left and right sides, gate, to centre, poured into a mould.
Concrete discharging point position and vibrator operating personnel quantity have been presetted.Before pouring concrete, first at bottom even, pour into a mould the thick cement mortar identical with the concrete mortar composition of housing of 50mm.Concrete is wanted continuous stratification cast, every layer of cast THICKNESS CONTROL is in 450mm, after vibration compacting, from first blanking again cloth, do not surpass the concrete initial setting time interval time of levels, 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, and with B20 reinforcing bar, repeatedly plugs and pounds, 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, be that absolute altitude is the above part of 1.35m, during housing 9 concrete, for preventing concrete, to lower, topple over, the concrete slump within the scope of this is strict controlled in 140 ± 10mm, and on housing 9 reinforcing bars, every 3m establishes one gauze wire cloth and falls with interception concrete simultaneously.Bottom lock formula template part adopts A50 vibrating spear to water and smashes, bilateral symmetry blanking.
For controlling housing 9 body structure surface absolute altitudes, before fluid concrete, in the range of structures of one side formwork, along isohypse 11 every a steel bar end of 2m welding, can not welding on principal rod, the absolute altitude of steel bar end is identical with the absolute altitude of housing 9 structural planes.In concrete placement, send special messenger to nurse template, check at any time the support situation of template.The blanking that can not converge in beam slab concrete placement, also must not locally pile up a large amount of concrete at one, should adopt symmetrical mode fluid concrete of jumping storehouse, keep even blanking, avoids making a large amount of Load concentrations a bit, causes local buckling.
10 carry out removing thin shell structures bracing frame after concrete curing
When reaching 100% design strength, concrete strength can start form removal.Should be from top to bottom by number, block-by-block removes, and forbids upper and lower both sides to be removed simultaneously.Dismounting order: remove top template 16 glass fiber reinforced plastic → downward U holder 6 → dismounting soffit formwork 15 glass fiber reinforced plastic → dismounting support system bracing frames.
(1) before reinforcing bar binding, section chief tackles construction corps and carries out written confiding a technological secret, and after operation team is further told somebody what one's real intentions are in detail, can arrange construction.Define on-the-spot specific requirement: snap the line, first reinforcing bar of reinforcing bar control line edges of boards obtain allowable variation etc. apart from 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.
(2), before assembling reinforcement, template face must scheme to brush interleaving agent, some necessary preparation must be handled properly, and the diameter of priority control reinforcing bar, specification, the thickness of concrete pad, split heads iron size, wall column reinforcing bar positioning bar, embedded iron parts etc.
(3) construction period structurally overburden stack building materials and construction rubbish.
The Engineering Quality Control of [0037] 11 large span multi-curvature shell steel concrete
Template is installed and must be guaranteed that position is accurate, and formwork edge joint is tight, and support system is solid and reliable, does not deform and displacement.After template installs, the position of survey crew reply template position, verticality, absolute altitude, pre-buried and hole to be provided etc. checks.The allowable variation of thin shell structures template should meet following table 1 regulation; During reinforcement installation; the kind of steel bar stress, rank, specification and quantity must meet designing requirement; during inspection, by observation or steel ruler inspection, carry out exhaustive test; while checking built-in fitting position of center line; should measure along both direction in length and breadth, and 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 must not have the dimensional errors over 1.5 times of table 2 or table 3 numerical value, 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 1, 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 member 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 long parallel lines from baseline to both sides that do 1～3 meter of a series of spacing to central axis as control line, adjacent two control lines and adjacent two isohypses (11) are surrounded to the specification of part and specification and the curvature data of the glass fiber reinforced plastic of curvature data after decomposing, and template producer is according to the data creating member glass fiber reinforced plastic having obtained;
Step 3, construction plant cleaning;
Step 4, unwrapping wire location: also unwrapping wire location, the position of mark isohypse (11) and vertical rod (8) are measured in job site according to full hall bracing frame vertical rod (8) layout plan and housing isohypse perspective view;
Step 5, set up full hall bracing frame: plan to build thin shell structures below set up full hall bracing frame, adopt fastener that vertical rod (8) and cross bar (7) are connected into support body, the top of the vertical rod of bracing frame (8) connects U holder (6), on U holder (6), connect the steel tube framework (4) identical with shell curvature, between described U holder (6) and steel tube framework (4), add the gap between timber wedge (5) jam-pack steel pipe and U holder;
Step 6, making thin shell structures template: first absolute altitude is the template line of demarcation (10) of 1～2 meter high, template line of demarcation (10) following part adopts bilateral glass steel form (1), sets up soffit formwork (15) and top template (16) simultaneously; The above part in template line of demarcation (10) adopts one-sided glass steel formwork (12), only has soffit formwork (15); Between the soffit formwork (15) of the bilateral glass steel form (1) of thin shell structures and top template (16), adopt drawing water-proof bolt (2) to connect;
Directly assembling reinforcement in the middle of template after step 7, template installation, 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 during pouring concrete;
Step 8, fluid concrete: adopt continuous stratification pouring procedure, every layer of cast THICKNESS CONTROL is in 450mm, surpass the concrete initial setting time interval time of levels, before pouring concrete, first at bottom even, pours into a mould the thick cement mortar identical with housing concrete mortar composition of 50mm; When bilateral glass steel form (1) part of cast bottom, adopt bilateral symmetry cutting mode; The also press polish of finally manually vibrating is wiped one's face, housing (9) moulding;
Step 9, the housing (9) that concrete casting is formed carry out maintenance;
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 4 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, by adjacent marked rod span wire system, determine in the middle of the absolute altitude of vertical rod, pole steel tube is carried out to sawing, it is highly met the requirements;
Step 4, from the left and right sides toward centre, progressively set up vertical rod (8);
Step 5, U holder (6) is installed at vertical rod (8) top;
Step 6, vertical rod (8) is highly tested and calibrated;
Step 7, set up cross bar (7);
Step 8, steel pipe is carried out to bending along the curvature of thin shell structures, make steel tube framework (4), make corresponding timber wedge (5) simultaneously;
Step 9, steel tube framework (4) is placed on to frame top, firm with U holder (6) colligation with iron wire, and with cross bar 7 use iron wire colligations links, U holds in the palm between (6) and steel tube framework (4) and fills in timber wedge (5), 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: not load-bearing of marked rod in described step 3, only carrying out the absolute altitude of vertical rod (8) controls, with taking with tearing open, every 4～8 row vertical rods of take in operation are one group, after the vertical rod of first group has been set up, remove the marked rod 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 of making thin shell structures template in described step 5 is:
Step 1, the template to be installed of all different curvature is numbered according to position to be installed;
Step 2, the place that is highly 1～2 meter at housing (9) mark template line of demarcation (10), and the isohypse that marks 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 to both sides from top, must guarantee that piece is tight, sponge strip is pasted at formwork edge joint place, and the piece between template is smeared sealing with proprietary material, with mortar leakage prevention;
Step 4, template line of demarcation (10) following part is prepared to housing (9) glass fiber reinforced plastic top template (16): in the following part in template line of demarcation (10), at completed one-sided glass fiber reinforced plastic lateral surface, add again one deck glass fiber reinforced plastic, become bilateral glass steel form (1), between the soffit formwork of bilateral glass steel form (15) and top template (16), adopt drawing water-proof bolt (2) to connect;
Step 5, template is proofreaied and correct: after template construction, must check work, 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: in described step 5 to drawing the both sides of sealing up screw (2) to be welded with steel bar end as shoring.
6. a kind of large span multi-curvature shell structure of reinforced concrete method according to claim 1, it is characterized in that: in described step 5 to drawing the two ends of sealing up screw (2) to be installed with the truncated cone-shaped plug of anti-slurry effect, plug clear spacing is that thick to deduct twice tampion thick for housing, after pouring concrete is complete, take out plug, on housing, will leave arc pit, the waterproofing mortar filling of a high label for pit.
7. a kind of large span multi-curvature shell structure of reinforced concrete method according to claim 1, is characterized in that: the sagittal edge at soffit formwork described in step 5 (15) arranges flange, and the thickness of the same housing of flange height (9) is identical.
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| CN110778108A (en) * | 2019-10-30 | 2020-02-11 | 中国建筑第八工程局有限公司 | Construction method of complex space multi-curved surface double-layer oblique crossing concrete grid structure |
| CN112031400A (en) * | 2020-09-03 | 2020-12-04 | 北京市第三建筑工程有限公司 | Construction method of concrete dome structure template |
| CN112031400B (en) * | 2020-09-03 | 2021-06-11 | 北京市第三建筑工程有限公司 | Construction method of concrete dome structure template |
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