CN105587060A - Construction method for slowly-bonded hollow prestressing floor slab through large-span ultra-thick cast-in-place post-tensioning method - Google Patents
Construction method for slowly-bonded hollow prestressing floor slab through large-span ultra-thick cast-in-place post-tensioning method Download PDFInfo
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- CN105587060A CN105587060A CN201510981353.9A CN201510981353A CN105587060A CN 105587060 A CN105587060 A CN 105587060A CN 201510981353 A CN201510981353 A CN 201510981353A CN 105587060 A CN105587060 A CN 105587060A
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- floor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
- E04B5/36—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/17—Floor structures partly formed in situ
- E04B5/18—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly cast between filling members
- E04B5/21—Cross-ribbed floors
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
The invention discloses a construction method for a slowly-bonded hollow prestressing floor slab through a large-span ultra-thick cast-in-place post-tensioning method. The method includes the main construction steps of (1) bottom formwork laying, (2) reinforcing steel bar construction, (3) side formwork installation, (4) prefabricated hollow block installation and reinforcement, (5) concrete pouring, and (6) prestressing tension. Main floor slab reinforcing steel bars are connected with a side formwork, so that the position of a main reinforcing steel bar framework is fixed. Prefabricated hollow blocks are connected with the main floor slab reinforcing steel bars through anti-floating reinforcing steel bars. The good effect is achieved in dealing with floating of the hollow blocks. U-shaped clips are used for locating the hollow blocks in the horizontal direction. Slowly-bonded prestressing reinforcing steel bars are located through locating supports accurately. By the adoption of the construction method, the use amount of concrete is reduced, the construction efficiency is improved, the manufacturing cost is reduced, damage to the environment is reduced, and the economic and social benefits are good.
Description
Technical field
The present invention relates to the construction method of prestressed hollow slab, relate in particular to the construction method of the retarded adhesive prestressed cassette ceiling of the super thick cast-in-place post stretching of large span.
Technical background
Along with significantly the promoting and individual demand growing of engineering level, domestic construction market is to opening wide the Requirement Increases of large space in recent years; The features such as prestressed hollow slab technology has that little, the rigidity of deadweight is large, cracking resistance, non-deformability are strong, have good adaptability to large span, large load structure.
In traditional cassette ceiling construction technology, the anti-floating of precast hollow piece is mostly adopted prefabricated section and main body reinforcing bar are connected and fixed, the buoyancy that precast hollow piece produces is delivered to framework of steel reinforcement, but for the super thick cassette ceiling of large span, precast hollow piece will produce huge buoyancy in the concrete of just having built, float if process bad reinforcing bar, the bed die entirety of may causing, the situation that shuttering supporting unstability is collapsed; What tradition prestressed hollow slab used is unbonded prestressing tendon or bonded prestressed tendon, unbonded prestressing tendon has the shortcoming of structural behaviour deficiency, and in bonded prestressed tendon construction, need to arrange duct and pressure drop, complex process and produced a large amount of pollutants.
Given this, need at present a kind of speed of application of invention badly fast, precast hollow piece Anti-floating design is reasonable, can adapt to the environmentally friendly hollow floor construction method of the super thick cassette ceiling of large span.
Summary of the invention
The object of the present invention is to provide a kind of speed of application fast, precast hollow piece Anti-floating design is reasonable, can adapt to the environmentally friendly hollow floor construction method of the super thick cassette ceiling of large span.
For achieving the above object, the present invention has adopted following technical scheme:
The construction method of the retarded adhesive prestressed cassette ceiling of the super thick cast-in-place post stretching of large span, comprises the following steps:
1) bed die is laid: arrange support component at floor design attitude, lay bed die above support component;
2) reinforcing bar binding: colligation floor bar, floor bar comprises rib of slab reinforcing bar and the main muscle of floor, requires the length of the main muscle of floor to exceed floor horizontal span, notes according to the position of the reserved precast hollow piece of design drawing when assembling reinforcement; Delayed bonding prestressed tendon adopts Steel bar rack location, and tied silk binding should not be too tight, is convenient to later stage stretch-draw;
3) side form is installed: above bed die, surrounding is installed floor side form, reserved steel bar hole on side form, and the main muscle of floor stretches out side form outside through this reinforced hole, and whole floor bar and floor side form are fixed;
4) precast hollow piece is installed, is reinforced: at floor correspondence position lay precast hollow piece, Anti-floating reinforcing steel bar is through precast hollow piece, and two ends are connected with floor top bars and baseplate reinforcing bar respectively, are provided with U-shaped clamp between contiguous prefabricated hollow block;
5) concreting: confirm, after side form sealing, to carry out building of top concrete, vibrate with vibrating spear in rib of slab position and grout hole while building;
6) prestressed stretch-draw: concrete strength reaches 80% of design and carries out the pre-stretch-draw of delayed bonding prestressed tendon, and intensity reaches 100% of design and completes final stretch-draw.
The construction method of the retarded adhesive prestressed cassette ceiling of the super thick cast-in-place post stretching of aforesaid large span, Steel bar rack described in step (2) is made up of stud, steel plate base, arc jacking, its light plate base and the welding of floor baseplate reinforcing bar, arched top holder is arranged in stud top.
The construction method of the retarded adhesive prestressed cassette ceiling of the super thick cast-in-place post stretching of aforesaid large span, described precast hollow piece top is provided with steam vent.
The construction method of the retarded adhesive prestressed cassette ceiling of the super thick cast-in-place post stretching of aforesaid large span, support component comprises the vertical support of installing of steel pipe and steel pipe bottom of lateral arrangement.
The construction method of the retarded adhesive prestressed cassette ceiling of the super thick cast-in-place post stretching of aforesaid large span, Anti-floating reinforcing steel bar and precast hollow piece adopt nut to fix.
The construction method of the retarded adhesive prestressed cassette ceiling of the super thick cast-in-place post stretching of aforesaid large span, the part that in step 3), the main muscle of floor stretches out floor side form puts rubber blanket.
The present invention has following feature and beneficial effect:
(1) node of delayed bonding prestressed tendon arranges that simply without reserving hole channel and pressure drop, easy construction, has reduced the buying of equipment, and has reduced the discharge of pollutant (mortar), is conducive to environmental protection.
(2) precast hollow piece, main body reinforcing bar, floor side form are linked to be an entirety by this construction method, and anti-floating is respond well, controlled admirably the disease that may exist in cassette ceiling casting process, ensured the quality of prestressed hollow slab construction.
(3) in the situation that not changing floor sectional dimension, the application of delayed bonding prestressed tendon technology can make the quantity of presstressed reinforcing steel reduce by 15% left and right, and cassette ceiling concrete amount is few, and therefore this construction method has good economic benefit.
In a word, this construction method is connected main floor muscle and then the position of stationary body framework of steel reinforcement with side form, and hollow prefabricated section is connected with floor main body reinforcing bar (baseplate reinforcing bar and top bars), aspect the floating of reply hollow block, has good effect; The location of delayed bonding prestressed tendon adopts locating support, accurate positioning; Adopt this construction method to reduce concrete amount, improved construction efficiency, reduced cost, reduced the destruction to environment simultaneously, there are good economic and social benefits.
Brief description of the drawings
Fig. 1 is the slow prestressed hollow slab schematic diagram that coheres of the super thick cast-in-place post stretching of the present invention;
Fig. 2 is the slow prestressed hollow slab cutaway view that coheres of the super thick cast-in-place post stretching of invention;
Fig. 3 is delayed bonding prestressed tendon layout drawing;
Fig. 4 is construction flow chart of the present invention.
In figure: 1. bed die, 2. baseplate reinforcing bar, 3. precast hollow piece, 4.U shape clamp, 5. Anti-floating reinforcing steel bar, 6. nut, 7. grout hole, 8. steam vent, 9. top bars, 10. concrete, 11. wood are distracted, 12. steel pipes, 13. supports, the main muscle of 14. floor, 15. rib of slab reinforcing bars, 16. side forms, 17. rubber blankets, 18. delayed bonding prestressed tendons, 19. cushion blocks, 20. bifilar iron wires, 21. tied silks, 22. studs, 23. steel plate bases, 24. arc jackings.
Detailed description of the invention
Illustrate technical scheme of the present invention below with reference to embodiment and accompanying drawing:
In these enforcements such as present embodiment Plate Welding technique, bolt connection construction technique, tension of prestressed tendon technique and concrete pouring construction technique, just do not state tired, emphasis is set forth the embodiment that the present invention relates to structure.
Embodiment 1
Fig. 1 is the slow prestressed hollow slab schematic diagram that coheres of the super thick cast-in-place post stretching of the present invention, Fig. 2 is the slow prestressed hollow slab cutaway view that coheres of the super thick cast-in-place post stretching of invention. with reference to Fig. 1, shown in 2, in the slow bottom of cohering prestressed hollow slab of super thick cast-in-place post stretching, be furnished with support component, this support component comprises the steel pipe 12 of lateral arrangement and vertical support 3, bed die 1 and baseplate reinforcing bar 2 are set above support component, above baseplate reinforcing bar 2, arranging the precast hollow piece 3 of many row's multiple rows, between precast hollow piece, arranging floor bar, floor bar comprises the main muscle 14 of the floor of lateral arrangement and rib of slab reinforcing bar 15, bed die 1 surrounding is erect side form 16, the main muscle 14 of floor is convenient to fix through side form 16, Anti-floating reinforcing steel bar 5 is connected with floor top bars 9 and baseplate reinforcing bar 2 respectively and is convenient to fixing precast hollow piece 3 through the rear two ends of precast hollow piece 3, and Anti-floating reinforcing steel bar 5 itself adopts nut 6 fixing with precast hollow piece 3, between contiguous prefabricated hollow block, be provided with U-shaped clamp 4, for the fixing precast hollow piece of level, baseplate reinforcing bar 2 is fixed with bed die 1 colligation by bifilar iron wire 20, and the bottom of precast hollow piece is lined with cushion block 19.
Fig. 3 is delayed bonding prestressed tendon layout drawing, and shown in Fig. 3, delayed bonding prestressed tendon is arranged employing Steel bar rack location, and tied silk 21 bindings should not be too tight, is convenient to later stage stretch-draw; Described Steel bar rack is by stud 22, steel plate base 23, and arc jacking 24 forms, and steel plate base 23 welds with baseplate reinforcing bar 2.
Fig. 4 is construction flow chart of the present invention, shown in Fig. 4, and the retarded adhesive prestressed hollow floor construction method of the super thick cast-in-place post stretching of large span, step is as follows:
(1) bed die is laid: set steel pipe 12, support 13 as supporting at floor design attitude, arrange that at steel pipe orthogonal direction wood is distracted 11, lay bed die 1 subsequently on wood distracted 11.
(2) colligation floor bar: floor bar comprises rib of slab reinforcing bar 15 and the main muscle 14 of floor, requires the main muscle of floor to exceed floor horizontal span, notes when assembling reinforcement according to the position of the reserved precast hollow piece 3 of design drawing; Delayed bonding prestressed tendon 18 adopts Steel bar rack location, and tied silk binding should not be too tight, is convenient to later stage stretch-draw.
(3) floor side form 16 is installed: main floor muscle 14 is aimed to side form preformed hole, and the main muscle 14 of floor stretches out side form outside, and whole framework of steel reinforcement is fixed on side form, and reinforcing bar sponson puts rubber blanket 17.
(4) precast hollow piece is installed, is reinforced: at floor correspondence position lay precast hollow piece 3, Anti-floating reinforcing steel bar 5 passes precast hollow piece 3 and is connected with floor top bars 9 and baseplate reinforcing bar 2.
(5) concreting: confirm, after side form 16 sealing, to carry out concrete 10 and build, while building, in rib of slab position and grout hole 7 is interior vibrates with vibrating spear, prefabricated section top is also provided with steam vent 8.
(6) prestressed stretch-draw: concrete strength reaches 80% of design and carries out the pre-stretch-draw of delayed bonding prestressed tendon 18, and intensity reaches 100% of design and completes final stretch-draw.
Claims (6)
1. the construction method of the retarded adhesive prestressed cassette ceiling of the super thick cast-in-place post stretching of large span, is characterized in that comprising the following steps:
1) bed die is laid: arrange support component at floor design attitude, lay bed die (1) above support component;
2) reinforcing bar binding: colligation floor bar, floor bar comprises rib of slab reinforcing bar (15) and the main muscle of floor (14), require the length of the main muscle of floor to exceed floor horizontal span, when assembling reinforcement, note according to the position of the reserved precast hollow piece (3) of design drawing; Delayed bonding prestressed tendon adopts Steel bar rack location, and tied silk binding should not be too tight, is convenient to later stage stretch-draw;
3) side form is installed: above bed die, surrounding is installed floor side form (16), reserved steel bar hole on side form, and the main muscle of floor (14) stretches out side form outside through this reinforced hole, and whole floor bar and floor side form are fixed; 4) precast hollow piece is installed, is reinforced: at floor correspondence position lay precast hollow piece (3), Anti-floating reinforcing steel bar (5) is through precast hollow piece, two ends are connected with floor top bars (9) and baseplate reinforcing bar (2) respectively, are provided with U-shaped clamp (4) between contiguous prefabricated hollow block;
5) concreting: confirm, after side form (16) sealing, to carry out building of top concrete, vibrate with vibrating spear in rib of slab position and grout hole (7) while building;
6) prestressed stretch-draw: concrete strength reaches 80% of design and carries out the pre-stretch-draw of delayed bonding prestressed tendon (18), and intensity reaches 100% of design and completes final stretch-draw.
2. the construction method of the retarded adhesive prestressed cassette ceiling of the super thick cast-in-place post stretching of large span according to claim 1, it is characterized in that the Steel bar rack described in step (2) is made up of stud (22), steel plate base (23), arc jacking (24), its light plate base and the welding of floor baseplate reinforcing bar, arched top holder is arranged in stud top.
3. the construction method of the retarded adhesive prestressed cassette ceiling of the super thick cast-in-place post stretching of large span according to claim 1, is characterized in that described precast hollow piece top is provided with steam vent (8).
4. the construction method of the retarded adhesive prestressed cassette ceiling of the super thick cast-in-place post stretching of large span according to claim 1, is characterized in that described support component comprises the vertical support (3) of installing of steel pipe (12) and steel pipe bottom of lateral arrangement.
5. the construction method of the retarded adhesive prestressed cassette ceiling of the super thick cast-in-place post stretching of large span according to claim 1, is characterized in that Anti-floating reinforcing steel bar (5) and precast hollow piece (3) adopt nut (6) fixing.
6. the construction method of the retarded adhesive prestressed cassette ceiling of the super thick cast-in-place post stretching of large span according to claim 1, is characterized in that the part that the main muscle of floor in step 3) stretches out floor side form puts rubber blanket (17).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510981353.9A CN105587060B (en) | 2015-12-23 | 2015-12-23 | The construction method of the retarded adhesive prestressed cassette ceiling of the cast-in-place post stretching of large span super thick |
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| CN201510981353.9A CN105587060B (en) | 2015-12-23 | 2015-12-23 | The construction method of the retarded adhesive prestressed cassette ceiling of the cast-in-place post stretching of large span super thick |
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| CN105587060A true CN105587060A (en) | 2016-05-18 |
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Cited By (8)
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| CN105908885A (en) * | 2016-06-27 | 2016-08-31 | 青岛建集团有限公司 | Great-width multi-hole lightweight core formwork and construction method thereof |
| CN106968377A (en) * | 2017-04-18 | 2017-07-21 | 华北理工大学 | The well formula rib frame laminated floor slab structure and its construction method of the built-in anti-suspension positioning device of light plastid |
| WO2018010523A1 (en) * | 2016-07-15 | 2018-01-18 | 中国矿业大学 | Honeycomb-hole profiled steel sheet-based superposed hollow core floor slab |
| CN111021614A (en) * | 2019-12-19 | 2020-04-17 | 中国建筑第八工程局有限公司 | Multi-layer large-span prestressed system and frame body quick-dismantling construction method thereof |
| CN113550477A (en) * | 2021-05-14 | 2021-10-26 | 哈尔滨工业大学（威海） | Low-cost foldable honeycomb core floor filling block and using method thereof |
| CN113789898A (en) * | 2021-09-28 | 2021-12-14 | 中能建西北城市建设有限公司 | Construction method of large-span slow-bonding prestressed floor slab |
| CN113802745A (en) * | 2021-08-24 | 2021-12-17 | 中铁七局集团有限公司 | Construction method of thin-wall concrete hollow floor |
| CN114635564A (en) * | 2022-01-10 | 2022-06-17 | 中铁二十一局集团第四工程有限公司 | Large-span slow-bonding prestressed hollow floor core mold construction method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105908885A (en) * | 2016-06-27 | 2016-08-31 | 青岛建集团有限公司 | Great-width multi-hole lightweight core formwork and construction method thereof |
| WO2018010523A1 (en) * | 2016-07-15 | 2018-01-18 | 中国矿业大学 | Honeycomb-hole profiled steel sheet-based superposed hollow core floor slab |
| CN106968377A (en) * | 2017-04-18 | 2017-07-21 | 华北理工大学 | The well formula rib frame laminated floor slab structure and its construction method of the built-in anti-suspension positioning device of light plastid |
| CN111021614A (en) * | 2019-12-19 | 2020-04-17 | 中国建筑第八工程局有限公司 | Multi-layer large-span prestressed system and frame body quick-dismantling construction method thereof |
| CN113550477A (en) * | 2021-05-14 | 2021-10-26 | 哈尔滨工业大学（威海） | Low-cost foldable honeycomb core floor filling block and using method thereof |
| CN113802745A (en) * | 2021-08-24 | 2021-12-17 | 中铁七局集团有限公司 | Construction method of thin-wall concrete hollow floor |
| CN113789898A (en) * | 2021-09-28 | 2021-12-14 | 中能建西北城市建设有限公司 | Construction method of large-span slow-bonding prestressed floor slab |
| CN114635564A (en) * | 2022-01-10 | 2022-06-17 | 中铁二十一局集团第四工程有限公司 | Large-span slow-bonding prestressed hollow floor core mold construction method |
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| CN105587060B (en) | 2018-09-14 |
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