CN103899088A - Construction method for large-span ultra-thin ultra-long cast-in-situ bare concrete plank - Google Patents
Construction method for large-span ultra-thin ultra-long cast-in-situ bare concrete plank Download PDFInfo
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- CN103899088A CN103899088A CN201410164633.6A CN201410164633A CN103899088A CN 103899088 A CN103899088 A CN 103899088A CN 201410164633 A CN201410164633 A CN 201410164633A CN 103899088 A CN103899088 A CN 103899088A
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Abstract
The invention discloses a construction method for a large-span ultra-thin ultra-long cast-in-situ bare concrete plank. The construction method for the large-span ultra-thin ultra-long cast-in-situ bare concrete plank comprises the steps of measurement and setting out, steel bar engineering construction, formwork engineering construction, concrete engineering construction, formwork detachment and concrete maintenance. By means of the construction method, on one hand, the overall straightness of the large-span ultra-thin ultra-long cast-in-situ bare concrete plank is achieved, a middle structure does not sink downwards, the uniformity of the color of surface concrete is achieved, no crack is generated, split bolts are uniformly beautiful, a formwork system is convenient to detach, and the phenomena that through a common construction method, the large-span ultra-thin ultra-long cast-in-situ bare concrete plank is not flat, has many bubbles, has a color difference and has large-area cracks. On the other hand, the construction method meets the national requirement for energy-saving construction, improves construction efficiency, shortens the construction period, and can eliminate a decoration layer of a concrete structure, thereby saving engineering construction cost, achieving the bare concrete decoration effect on the aspect of design, and guaranteeing construction quality.
Description
Technical field
The present invention relates to the ultra-thin overlength cast-in-situ clear-water concrete of a kind of large span Slate hanging construction method, belong to technical field of building construction.
Background technology
Along with the requirement to building aesthetic, the application of clear-water concrete is also developing rapidly, the clear-water concrete link plate member of precasting has also obtained generally using, but aspect the construction of cast-in-situ clear-water concrete link plate, still have many technological difficulties, conventional method when construction often occurs that out-of-flatness, bubble are many, have aberration, have the phenomenon in large area crack.
Summary of the invention
Goal of the invention: the object of the invention is to for the deficiencies in the prior art, the ultra-thin overlength cast-in-situ clear-water concrete of a kind of large span Slate hanging construction method is provided, can realize the ultra-thin overlength cast-in-situ clear-water concrete of large span link plate entirety glacing flatness, intermediate structure not lower unity and free from flaw rich, surperficial concrete color produces, split bolt hole presents unified aesthetic feeling, simultaneously template system is convenient to remove, and the out-of-flatness, the bubble that occur while having avoided conventional method construction many, have aberration, have the phenomenon in large area crack.
Technical scheme: the ultra-thin overlength cast-in-situ clear-water concrete of a kind of large span of the present invention Slate hanging construction method, comprises and measure unwrapping wire, reinforcement engineering construction, form work engineering construction, concrete engineering construction and form removable and concrete curing;
Described measurement unwrapping wire comprises to be thrown planar axes line traffic control point to measure each layer, sets up the control net of each layer of construction section, determine plane upper member axis, and bullet is established elongated control line and template size line;
Described reinforcement engineering construction, due to clear water link plate length overlength, for preventing concrete cracking, shrinkage joint is set, stitch wide 15-25mm, link plate reinforcing bar disconnects herein, specifically comprise following construction node: (1) reinforcing bar setting-out and processing, when reinforcing bar setting-out, must consider the elongation per unit length of reinforcing bar in bending machining, should meet anchorage length, prevent again beam column corner and the confluce reinforcing bar top template because bending up, cause part to reveal muscle and make exterior wall big angle occur rust staining; (2) main muscle adjustment and installation; First within the walls joint bar should be corrected accurately in its bottom, and find out space of main steel bar, main muscle should be in conjunction with split bolt hole layout viewing in the time arranging, dodge split bolt hole site, then main muscle carries out soldering with joint bar within the walls, and one side welding is no less than 10d, and the ranks of reinforcing bar are clear and coherent consistent, position is accurate, unshift; (3) stirrup colligation and welding; Stirrup should be dodged split bolt hole site, and colligation silk is selected 20～22# and rustless baked wheaten cake silk, the equal colligation of each vertical muscle and horizontal bar crosspoint, and colligation silk head is tightened and should be no less than two circles, becomes splayed firm, and colligation silk head all should be towards kernel of section; (4) colligation cushion block, first determines thickness of protection tier, and clear-water concrete reinforcement cover should expand 5mm～10mm than ordinary concrete member reinforcing steel bar topping, ensures the topping of the arranged crosswise of reinforcing bar simultaneously; Secondly, topping cushion block adopts clear-water concrete high-strength concrete point to contact cushion block, placement that cushion block is quincunx, and topping cushion block spacing is controlled in 600mm, and firm with crust reinforcing bar binding; (5) reinforcing bar is checked and accepted;
Described form work engineering construction comprises following construction node: (1) stencil design and making, and template adopts Visa plate, according to the stressed feature of the structure of clear water link plate, select reinforcement system, accomplish to reuse, to split bolt hole Uniting spacing, present unified aesthetic feeling simultaneously, between formwork edge joint, adopt structure glue sealing, the formwork edge joint back side adopts corner brace band flat, prevents faulting of slab ends, and template secondary joist adopts zinc-plated square steel keel, main joist adopts double flute steel, and steel pipe support is as support system; (2) template scene is assembled in advance, carries out template assembled in advance according to pre-splicing numbering, ensures the vertical friendship circle of outseam, cicada seam, simultaneously even brushing release agent; (3) template installation and acceptance;
Described concrete engineering construction comprises following construction node: (1) raw material are selected, for guaranteeing concrete construction quality, need strict control of material quality, select grating good, same manufacturer production, the satisfactory sand of indices, stone material, the same kind of cement selection, with the product of label and same producer; (2) design of concrete and preparation, stirring the concrete specific targets that form is: the initial setting time: >=4.5 hours, final setting time :≤12 hours, workability: excellent, slump 140～180mm, within 1 hour, loss of slump value is less than 25mm, slump divergence: 400mm～500 ㎜, degree of mobilization >400mm, filling H<5mm, education resistance Δ G <7%, protect plasticity: meet These parameters in 90 minutes; (3) before concrete cast with air compressor machine or the inner rubbish of dust catcher blowing-out template, keep clean in mould, without ponding; (4) while building, first build after the sub-cement mortar of the thick de-stone identical with strength grade of concrete of 30～50 ㎜ at form assembly intracavity bottom, then concreting, the free blanking height of concrete should be controlled in 2m; (5) adopt vibrating spear to vibrate, concrete shakes and a little should start to edge distribution from centre, and cloth rod is evenly, hasp layer by layer, and should carry out with building continuously; (6) insertion depth of tamper is greater than height of lift height pattern, inserts 50～100 ㎜ in lower-layer concrete, makes the concrete of building form structure uniformly densely; (7) concrete is successively no more than 30 minutes in the interval of two-step pouring, and before building for the second time, the thick layer of concrete of 150 ㎜ of the TOC that be built last time vibrates again, to make the concrete of two-step pouring be combined into closely knit entirety; (8) vibrate and should avoid sled shake template, reinforcing bar in process, each time of vibration shaking is a little 20～30s, till no longer sinking, overflow without bubble with concrete surface, avoiding shakes emanates, and will make vibrating spear keep being not less than the distance of 50 ㎜ from clear-water concrete surface in the process of vibrating; (9) the concrete height of disposable continuous placing is no more than 500 ㎜;
Described form removable and concrete curing; Specific construction node is: the side form of clear water concrete should be removed after 48h at normal temperatures; and adjust in time striking time according to variations in temperature; maintenance immediately after the form removal of clear-water concrete link plate; hang up the airtight moisturizing Preservation of the thin mould of plastics and five-layer plywood, the concrete curing time is no less than 14d.
Particularly important to the selection of concrete raw material in practice of construction, specific requirement is:
1, cement, the tone of ornamental concrete, surface effect, durability etc. depend on cement to a great extent, therefore in selection course, should pay attention to the performances such as color, intensity, soundness, durability and the weather resistance of cement, select early strength high, dry-shrinkage deformed little, Portland cement that color is darker, consistent for ensureing concrete color, must select same producer, the cement of same strength grade, should not use different manufacturers cement with.
2, aggregate, fines should select that quality is hard, grating is good, river sand or the manufactured sand of solid colour, its fineness modulus should be greater than 2.6(medium sand), mud content should not be greater than 1.5%.Coarse aggregate should select continuous grading good, the stone of solid colour, cleaning, and stone mud content should be less than 1%, and pin sheet-like particle is not more than 15%.Select the ability that also should consider that it is stable, without interruption as gathering materials of ornamental concrete, guarantee to gather materials from the same place of production, forbid to use basic active aggregate and high-alkali reactive aggregates.
3, admixture, should also be noted that the influence factor to color after concrete formation as the admixture of ornamental concrete.Select suitable admixture not only to improve concrete workability, can also reduce concrete shrinkage, bleeding performance, and be used in conjunction with Admixture, can improve concrete presentation quality.Conventionally select the admixture of I level flyash as clear-water concrete.
Further improve technique scheme, the processing of described template comprises following construction point: the necessary not damaged of (1) template face, and there is the surface of damage to be placed on dorsal part, two sides must adopt atom mortar surface to fill while all having damage, require closely knitly and smooth, then polish smooth with fine sandpaper; (2) must use fine saw when template cutting edge, consider reducing of saw blade thickness simultaneously; (3) plane limit processing requirements: touch smooth stinglessly as standard taking hand, and adjacent edge is vertical, perfectly straight; (4) the status requirement bore position deviation of snap the line positioning bolt hole is not more than 2mm, the line of ink marker must be wiped with wet cloth, in order to avoid be printed on concrete face after having holed; (5) around template cutting edge and bolt hole, brush seals waterproof varnish two times; (6) Visa plate is beaten appropriate glass cement at plate side before spelling mutually, to ensure not dehydration of edge joint position; (7) the fixing screw that adopts of keel and Visa plate is fixed from the template back side by corner brace, and the degree of depth that wood screw enters Visa ensures that template does not penetrate; (8) the back-to-back setting of channel-section steel, after secondary joist welding, with the connection of " 7 " font gib headed bolt; (9) when counter pull bolt end plug is installed, between template and plug, add the rubber sheet gasket identical with plug external diameter, and must tighten, ensure not spillage of bolt hole position; It is closely seamless that the installation of exposed joint strip should adopt wood screw to be connected with template, and exposed joint strip place criticizes flat with atomized ash, and the installation of exposed joint strip must be straight; (10) template construct should be inspected for acceptance after completing, and it is qualified when acceptance criteria against regulation, should to rectify and improve in time, and numbering.
Further improve technique scheme, the installation and acceptance of described template, Specific construction main points are: (1) template should be checked template contral line before installing, and performs elevation control; (2) installation form should carry out in strict accordance with joining mould full-size drawing, sits in the right seat, and fixed point is used, and the template of pulling down from the preceding paragraph will forward in time the same area of next section to and install, and template is by joining mould design scheme, numbering installation, and position ensures accurately; (3) link plate one side template is first installed, by the position line of template by centering in place template, then installing plate soffit formwork; (4), when installation side template, template is placed on channel-section steel connecting platform, and template is in place, wear bolton and proofread and correct, notice that the junction of constuction joint plate must be tight, solid and reliable, prevent faulting of slab ends and spillage phenomenon, plate seam double-sided tape between template, with mortar leakage prevention; (5) formwork edge joint deviation is not more than 2mm, and exposed joint strip and formwork edge joint are pasted tight by sandwich rubber, and between template, piece hands over circle to be not more than 5mm; (6) link plate side template perpendicularity deviation is not more than 2mm, and panel physical dimension deviation is not more than 2mm, and negative and positive Founder, straight allowable variation are not more than 2mm, and reserved opening centerline deviation is not more than 2mm;
Further, described shrinkage joint end mould adopts the butter churn of the strong PVC plate holder of three floor heights, and first middle PVC plate is extracted out when form removal, then removes two on limit.
Further, release agent adopts diesel oil and machine oil to mix by the volume ratio of 2:8, and stripping result is good, builds the link plate smooth outer surface after moulding, without burr.
Further, described concrete adopts the raw material of following match ratio: P.O42.5 class g cement 309 kg/ m
3, F class I level flyash 38 kg/ m
3, S95 level breeze 38 kg/ m
3, medium sand 756 kg/ m
3, the stone 1089 kg/ m that particle diameter is 5～31.5mm
3, JM-PCA water reducing agent 5 kg/ m
3, drinking water 150 kg/ m
3, adopt the link plate forming after above-mentioned concreting can effectively control its intensity and external surface planeness, color and luster and crack.
The present invention compared with prior art, its beneficial effect is: the ultra-thin overlength cast-in-situ clear-water concrete of a kind of large span of the present invention Slate hanging construction method, (1) can realize the ultra-thin overlength cast-in-situ clear-water concrete of large span link plate entirety glacing flatness, intermediate structure not lower unity and free from flaw rich, surperficial concrete color produces, the unified aesthetic feeling that split bolt hole presents, simultaneously template system is convenient to remove, and the out-of-flatness, the bubble that occur while having avoided conventional method construction many, have aberration, have the phenomenon in large area crack; (2) meet country about the relevant requirements of Energy Conservation Project in Construction, improve efficiency of construction, the reduction of erection time, and can cancel the decorative layer of concrete structure, thus save Construction Cost, also can reach the clear water decorative effect in design, guarantee construction quality.
Brief description of the drawings
Fig. 1 is the construction flow chart of embodiment 1.
Fig. 2 is external surface schematic diagram after the moulding of clear-water concrete link plate described in embodiment 1.
Fig. 3 is stencil design node schematic diagram in embodiment 1.
Fig. 4 is stencil design schematic diagram in embodiment 1.
In figure: 1, clear-water concrete link plate; 2, structural column; 3, outseam; 4, split bolt hole; 5, shrinkage joint; 6, Visa template die plate; 7, square steel secondary joist; 8, channel-section steel main joist; 9, split bolt; 10, steel pipe support; 11, pre-buried plug-in unit.
Detailed description of the invention
Below technical solution of the present invention is elaborated, but protection scope of the present invention is not limited to described embodiment.
Embodiment 1: the outer side elevation link plate of Vierendeel girder that Lu Kou International airport, Nanjing 9 meters of starting layers of T2 airport terminal project are positioned at air outlet and position, boarding ramp adopts decoration clear-water concrete, amount to approximately 3000 square metres, for cast-in-situ clear-water concrete cladding panel structure, comprise and measure unwrapping wire, reinforcement engineering construction, form work engineering construction, concrete engineering construction and form removable and concrete curing, concrete process chart, refers to Fig. 1.
Described measurement unwrapping wire comprises to be thrown planar axes line traffic control point to measure each layer, sets up the control net of each layer of construction section, determine plane upper member axis, and bullet is established elongated control line and template size line.
Described reinforcement engineering construction, due to clear water link plate length overlength, for preventing concrete cracking, shrinkage joint is set, stitch wide 15-25mm, link plate reinforcing bar disconnects herein, specifically comprise following construction node: (1) reinforcing bar setting-out and processing, when reinforcing bar setting-out, must consider the elongation per unit length of reinforcing bar in bending machining, should meet anchorage length, prevent again beam column corner and the confluce reinforcing bar top template because bending up, cause part to reveal muscle and make exterior wall big angle occur rust staining; (2) main muscle adjustment and installation; First within the walls joint bar should be corrected accurately in its bottom, and finds out space of main steel bar, and main muscle should be in conjunction with split bolt hole layout viewing in the time arranging, dodge split bolt hole site, then main muscle carries out soldering, one side welding 10d with joint bar within the walls, the ranks of reinforcing bar are clear and coherent consistent, and position is accurate, unshift; (3) stirrup colligation and welding; Stirrup should be dodged split bolt hole site, and colligation silk is selected 20～22# and rustless baked wheaten cake silk, the equal colligation of each vertical muscle and horizontal bar crosspoint, and colligation silk head is tightened by and should be no less than two circles, becomes splayed firm, and colligation silk head all should be towards kernel of section; (4) colligation cushion block, first determines thickness of protection tier, and clear-water concrete reinforcement cover should expand 5mm～10mm than ordinary concrete member reinforcing steel bar topping, ensures the topping of the arranged crosswise of reinforcing bar simultaneously; Secondly, topping cushion block adopts the special high-strength concrete point of clear-water concrete to contact cushion block, placement that cushion block is quincunx, and topping cushion block spacing is controlled in 600mm, and firm with crust reinforcing bar binding; (5) reinforcing bar is checked and accepted.
Described form work engineering construction comprises following construction node: (1) stencil design and making, template adopts Visa plate, according to the stressed feature of the structure of clear water link plate, select reinforcement system, accomplish to reuse, simultaneously to split bolt hole Uniting spacing, ensure the aesthetic feeling of whole structure, between formwork edge joint, adopt structure glue sealing, the formwork edge joint back side adopts corner brace band flat, prevents faulting of slab ends, must not be on template front iron nail, template secondary joist adopts zinc-plated square steel keel, and main joist adopts double flute steel, and steel pipe is as support system; (2) template scene is assembled in advance, carries out template assembly according to pre-splicing numbering, ensures the vertical friendship circle of outseam, cicada seam, and brushing release agent simultaneously, should evenly brush, and finally with dry towel, unnecessary release agent is wiped, in order to avoid be stained with foreign matter; (3) template installation and acceptance.
Described concrete engineering construction comprises following construction node: (1) raw material are selected, for guaranteeing concrete construction quality, need strict control of material quality, select grating good, same manufacturer production, the satisfactory sand of indices, stone material, the same kind of cement selection, with the product of label and same producer; (2) design of concrete and preparation, stirring the concrete specific targets that form is: the initial setting time: >=4.5 hours, final setting time :≤12 hours, workability: excellent, slump 140～180mm, within 1 hour, loss of slump value is less than 25mm, slump divergence: 400mm～500 ㎜, degree of mobilization >400mm, filling H<5mm, education resistance Δ G <7%, protect plasticity: meet These parameters in 90 minutes; (3) before concrete cast with air compressor machine or the inner rubbish of dust catcher blowing-out template, keep clean in mould, without ponding; (4) while building, first build after the sub-cement mortar of the thick de-stone identical with strength grade of concrete of 30～50 ㎜ at form assembly intracavity bottom, then concreting, the free blanking height of concrete should be controlled in 2m; (5) adopt vibrating spear to vibrate, concrete shakes and a little should start to edge distribution from centre, and cloth rod is evenly, hasp layer by layer, and should carry out with building continuously; (6) insertion depth of tamper is greater than height of lift height pattern, inserts 50～100 ㎜ in lower-layer concrete, makes the concrete of building form structure uniformly densely; (7) concrete is successively no more than 30 minutes in the interval of two-step pouring, and before building for the second time, the thick layer of concrete of 150 ㎜ of the TOC that be built last time vibrates again, to make the concrete of two-step pouring be combined into closely knit entirety; (8) vibrate and should avoid sled shake template, reinforcing bar in process, each time of vibration shaking is a little 20～30s, till no longer sinking, overflow without bubble with concrete surface, avoiding shakes emanates, and will make vibrating spear keep being not less than the distance of 50 ㎜ from clear-water concrete surface in the process of vibrating; (9) the concrete height of disposable continuous placing is no more than 500 ㎜;
Described form removable and concrete curing; Specific construction node is: the side form of clear water concrete should be removed after 48h at normal temperatures; and adjust in time striking time according to variations in temperature; maintenance immediately after the form removal of clear-water concrete link plate; hang up the airtight moisturizing Preservation of the thin mould of plastics and five-layer plywood, the concrete curing time is no less than 14d.
The processing of described template comprises following construction point: the necessary not damaged of (1) template face, and there is the surface of damage to be placed on dorsal part, it is closely knit and smooth that two sides must adopt atom mortar surface to fill while all having damage, then polishes smooth with fine sandpaper; (2) must use fine saw when template cutting edge, consider reducing of saw blade thickness simultaneously; (3) plane limit processing requirements: touch smooth stinglessly as standard taking hand, and adjacent edge is vertical, perfectly straight; (4) while operation, do not allow to wear footwear of the hard end on template plate, should wear footwear and other footwear of flexible end at the bottom of foam; (5) the status requirement bore position deviation of snap the line positioning bolt hole is not more than 2mm, the line of ink marker must be wiped with wet cloth, in order to avoid be printed on concrete face after having holed; (6) around template cutting edge and bolt hole, brush seals waterproof varnish two times; (7) Visa plate is beaten appropriate glass cement at plate side before spelling mutually, to ensure not dehydration of edge joint position; (8) the fixing screw that adopts of keel and Visa plate is fixed from the template back side by corner brace, and the degree of depth that wood screw enters Visa plate is 14～15mm, and the template that at least retains 3～4mm does not penetrate; (9) after the back-to-back spacing 2cm of channel-section steel and secondary joist welding, with the connection of " 7 " font gib headed bolt; (10) when counter pull bolt end plug is installed, between template and plug, add the rubber sheet gasket identical with plug external diameter, and must tighten, ensure not spillage of bolt hole position; It is closely seamless that the installation of exposed joint strip should adopt wood screw to be connected with template, and exposed joint strip place criticizes flat with atomized ash, and the installation of exposed joint strip must be straight; (11) template construct should be inspected for acceptance after completing, and it is qualified when acceptance criteria against regulation, should to rectify and improve in time, and numbering.
The installation and acceptance of described template, Specific construction main points are: (1) template should be checked template contral line before installing, and performs elevation control; (2) installation form should carry out in strict accordance with joining mould full-size drawing, sits in the right seat, and fixed point is used, and the template of pulling down from the preceding paragraph will forward in time the same area of next section to and install, and template is by joining mould design scheme, numbering installation, and position ensures accurately; (3) link plate one side template is first installed, by the position line of template by centering in place template, then installing plate soffit formwork; (4), when installation side template, template is placed on channel-section steel connecting platform, and template is in place, wear bolton and proofread and correct, notice that the junction of constuction joint plate must be tight, solid and reliable, prevent faulting of slab ends and spillage phenomenon, plate seam double-sided tape between template, with mortar leakage prevention; (5) formwork edge joint deviation is not more than 2mm, and exposed joint strip and formwork edge joint are pasted tight by sandwich rubber, and between template, piece hands over circle to be not more than 5mm; (6) link plate side template perpendicularity deviation is not more than 2mm, and panel physical dimension deviation is not more than 2mm, negative and positive Founder, straight allowable variation 2mm, and reserved opening centerline deviation is not more than 2mm.
Wherein: described shrinkage joint end mould adopts the butter churn of the strong PVC plate holder of three floor heights, and first middle PVC plate is extracted out when form removal, then removed two on limit.
Described release agent adopts diesel oil and machine oil to mix by the volume ratio of 2:8.
Described concrete adopts the raw material of following match ratio: P.O42.5 class g cement 309 kg/ m
3, F class I level flyash 38 kg/ m
3, S95 level breeze 38 kg/ m
3, medium sand 756 kg/ m
3, the stone 1089 kg/ m that particle diameter is 5～31.5mm
3, JM-PCA water reducing agent 5 kg/ m
3, drinking water 150 kg/ m
3, adopt the link plate forming after above-mentioned concreting can effectively control its intensity and external surface planeness, color and luster and crack.
As mentioned above, although represented and explained the present invention with reference to specific preferred embodiment, it shall not be construed as the restriction to the present invention self.Not departing under the spirit and scope of the present invention prerequisite of claims definition, can make in the form and details various variations to it.
Claims (6)
1. the ultra-thin overlength cast-in-situ clear-water concrete of a large span Slate hanging construction method, is characterized in that: comprise and measure unwrapping wire, reinforcement engineering construction, form work engineering construction, concrete engineering construction and form removable and concrete curing;
Described measurement unwrapping wire comprises to be thrown planar axes line traffic control point to measure each layer, sets up the control net of each layer of construction section, determine plane upper member axis, and bullet is established elongated control line and template size line;
Described reinforcement engineering construction, due to clear water link plate length overlength, for preventing concrete cracking, shrinkage joint is set, stitch wide 15-25mm, link plate reinforcing bar disconnects herein, specifically comprise following construction node: (1) reinforcing bar setting-out and processing, when reinforcing bar setting-out, must consider the elongation per unit length of reinforcing bar in bending machining, should meet anchorage length, prevent again beam column corner and the confluce reinforcing bar top template because bending up, cause part to reveal muscle and make exterior wall big angle occur rust staining; (2) main muscle adjustment and installation; First within the walls joint bar should be corrected accurately in its bottom, and find out space of main steel bar, main muscle should be in conjunction with split bolt hole layout viewing in the time arranging, dodge split bolt hole site, then main muscle carries out soldering with joint bar within the walls, and one side welding is no less than 10d, and the ranks of reinforcing bar are clear and coherent consistent, position is accurate, unshift; (3) stirrup colligation and welding; Stirrup should be dodged split bolt hole site, and colligation silk is selected 20～22# and rustless baked wheaten cake silk, the equal colligation of each vertical muscle and horizontal bar crosspoint, and colligation silk head is tightened and should be no less than two circles, becomes splayed firm, and colligation silk head all should be towards kernel of section; (4) colligation cushion block, first determines thickness of protection tier, and clear-water concrete reinforcement cover should expand 5mm～10mm than ordinary concrete member reinforcing steel bar topping, ensures the topping of the arranged crosswise of reinforcing bar simultaneously; Secondly, topping cushion block adopts clear-water concrete high-strength concrete point to contact cushion block, placement that cushion block is quincunx, and topping cushion block spacing is controlled in 600mm, and firm with crust reinforcing bar binding; (5) reinforcing bar is checked and accepted;
Described form work engineering construction comprises following construction node: (1) stencil design and making, template adopts Visa plate, according to the stressed feature of the structure of clear water link plate, selects reinforcement system, accomplish to reuse, to split bolt hole Uniting spacing, adopt structure glue sealing between formwork edge joint, the formwork edge joint back side adopts corner brace band flat simultaneously, prevent faulting of slab ends, template secondary joist adopts zinc-plated square steel keel, and main joist adopts double flute steel, and steel pipe support is as support system; (2) template scene is assembled in advance, carries out template assembled in advance according to pre-splicing numbering, ensures the vertical friendship circle of outseam, cicada seam, simultaneously even brushing release agent; (3) template installation and acceptance;
Described concrete engineering construction comprises following construction node: (1) raw material are selected, for guaranteeing concrete construction quality, need strict control of material quality, select grating good, same manufacturer production, the satisfactory sand of indices, stone material, the same kind of cement selection, with the product of label and same producer; (2) design of concrete and preparation, stirring the concrete specific targets that form is: the initial setting time: >=4.5 hours, final setting time :≤12 hours, workability: excellent, slump 140～180mm, within 1 hour, loss of slump value is less than 25mm, slump divergence: 400mm～500 ㎜, degree of mobilization >400mm, filling H<5mm, education resistance Δ G <7%, protect plasticity: meet These parameters in 90 minutes; (3) before concrete cast with air compressor machine or the inner rubbish of dust catcher blowing-out template, keep clean in mould, without ponding; (4) while building, first build after the sub-cement mortar of the thick de-stone identical with strength grade of concrete of 30～50 ㎜ at form assembly intracavity bottom, then concreting, the free blanking height of concrete should be controlled in 2m; (5) adopt vibrating spear to vibrate, concrete shakes and a little should start to edge distribution from centre, and cloth rod is evenly, hasp layer by layer, and should carry out with building continuously; (6) insertion depth of tamper is greater than height of lift height pattern, inserts 50～100 ㎜ in lower-layer concrete, makes the concrete of building form structure uniformly densely; (7) concrete is successively no more than 30 minutes in the interval of two-step pouring, and before building for the second time, the thick layer of concrete of 150 ㎜ of the TOC that be built last time vibrates again, to make the concrete of two-step pouring be combined into closely knit entirety; (8) vibrate and should avoid sled shake template, reinforcing bar in process, each time of vibration shaking is a little 20～30s, till no longer sinking, overflow without bubble with concrete surface, avoiding shakes emanates, and will make vibrating spear keep being not less than the distance of 50 ㎜ from clear-water concrete surface in the process of vibrating; (9) the concrete height of disposable continuous placing is no more than 500 ㎜;
Described form removable and concrete curing; Specific construction node is: the side form of clear water concrete should be removed after 48h at normal temperatures; and adjust in time striking time according to variations in temperature; maintenance immediately after the form removal of clear-water concrete link plate; hang up the airtight moisturizing Preservation of the thin mould of plastics and five-layer plywood, the concrete curing time is no less than 14d.
2. the ultra-thin overlength cast-in-situ clear-water concrete of a kind of large span according to claim 1 Slate hanging construction method, it is characterized in that, the processing of described template comprises following construction point: the necessary not damaged of (1) template face, there is the surface of damage to be placed on dorsal part, two sides must adopt atom mortar surface to fill while all having damage, require closely knitly and smooth, then polish smooth with fine sandpaper; (2) must use fine saw when template cutting edge, consider reducing of saw blade thickness simultaneously; (3) plane limit processing requirements: touch smooth stinglessly as standard taking hand, and adjacent edge is vertical, perfectly straight; (4) the status requirement bore position deviation of snap the line positioning bolt hole is not more than 2mm, the line of ink marker must be wiped with wet cloth, in order to avoid be printed on concrete face after having holed; (5) around template cutting edge and bolt hole, brush seals waterproof varnish two times; (6) Visa plate is beaten appropriate glass cement at plate side before spelling mutually, to ensure not dehydration of edge joint position; (7) the fixing screw that adopts of keel and Visa plate is fixed from the template back side by corner brace, and the degree of depth that wood screw enters Visa ensures that template does not penetrate; (8) the back-to-back setting of channel-section steel, after secondary joist welding, with the connection of " 7 " font gib headed bolt; (9) when counter pull bolt end plug is installed, between template and plug, add the rubber sheet gasket identical with plug external diameter, and must tighten, ensure not spillage of bolt hole position; It is closely seamless that the installation of exposed joint strip should adopt wood screw to be connected with template, and exposed joint strip place criticizes flat with atomized ash, and the installation of exposed joint strip must be straight; (10) template construct should be inspected for acceptance after completing, and it is qualified when acceptance criteria against regulation, should to rectify and improve in time, and numbering.
3. the ultra-thin overlength cast-in-situ clear-water concrete of a kind of large span according to claim 1 Slate hanging construction method, it is characterized in that, the installation and acceptance of described template, Specific construction main points are: (1) template should be checked template contral line before installing, and performs elevation control; (2) installation form should carry out in strict accordance with joining mould full-size drawing, sits in the right seat, and fixed point is used, and the template of pulling down from the preceding paragraph will forward in time the same area of next section to and install, and template is by joining mould design scheme, numbering installation, and position ensures accurately; (3) link plate one side template is first installed, by the position line of template by centering in place template, then installing plate soffit formwork; (4), when installation side template, template is placed on channel-section steel connecting platform, and template is in place, wear bolton and proofread and correct, notice that the junction of constuction joint plate must be tight, solid and reliable, prevent faulting of slab ends and spillage phenomenon, plate seam double-sided tape between template, with mortar leakage prevention; (5) formwork edge joint deviation is not more than 2mm, and exposed joint strip and formwork edge joint are pasted tight by sandwich rubber, and between template, piece hands over circle to be not more than 5mm; (6) link plate side template perpendicularity deviation is not more than 2mm, and panel physical dimension deviation is not more than 2mm, and negative and positive Founder, straight allowable variation are not more than 2mm, and reserved opening centerline deviation is not more than 2mm.
4. the ultra-thin overlength cast-in-situ clear-water concrete of a kind of large span according to claim 1 Slate hanging construction method, it is characterized in that, described shrinkage joint end mould adopts the butter churn of the strong PVC plate holder of three floor heights, and first middle PVC plate is extracted out when form removal, then removes two on limit.
5. the ultra-thin overlength cast-in-situ clear-water concrete of a kind of large span according to claim 1 Slate hanging construction method, is characterized in that, described release agent adopts diesel oil and machine oil to mix by the volume ratio of 2:8.
6. the ultra-thin overlength cast-in-situ clear-water concrete of a kind of large span according to claim 1 Slate hanging construction method, is characterized in that, described concrete adopts the raw material of following match ratio: P.O42.5 class g cement 309 kg/ m
3, F class I level flyash 38 kg/ m
3, S95 level breeze 38 kg/ m
3, medium sand 756 kg/ m
3, the stone 1089 kg/ m that particle diameter is 5～31.5mm
3, JM-PCA water reducing agent 5 kg/ m
3, drinking water 150 kg/ m
3.
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