CN104405068A - Construction method of post-tensioned unbonded prestressed hollow floor slab - Google Patents
Construction method of post-tensioned unbonded prestressed hollow floor slab Download PDFInfo
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- CN104405068A CN104405068A CN201410534654.2A CN201410534654A CN104405068A CN 104405068 A CN104405068 A CN 104405068A CN 201410534654 A CN201410534654 A CN 201410534654A CN 104405068 A CN104405068 A CN 104405068A
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Abstract
The invention relates to a construction method of a post-tensioned unbonded prestressed hollow floor slab. The construction method comprises the following steps of step 1, measuring and paying off a floor system; step 2, building a floor system support framework and installing a template; step 3, positioning and marking a framework beam, a core mold and a reserved embedded facility on the template; step 4, installing the framework beam and reinforcing steel bars on the bottom of the floor slab, installing square steel on the bottom of the floor slab, and perforating positioning holes on the surface of the square steel; step 5, installing prestressed tendons; step 6, installing the core mold, horizontally positioning the core mold, and adding an anti-floating anchoring means; step 7, installing a positioning part for preventing the core mold from sliding on the square steel in each positioning hole; step 8, inspecting the installation quality of the core mold; step 9, installing reinforcing steel bars on the surface of the floor slab; step 10, inspecting the concealment of the reinforcing steel bars; step 11, pouring the floor system concrete; step 12, maintaining the concrete; step 13, tensioning the prestressed tendons and grouting pores; and step 14, disassembling the mold. By adopting the construction method, the construction quality of the large-span floor slab can be improved.
Description
Technical field
The present invention relates to a kind of floor construction method, more particularly it relates to a kind of construction method of large span cassette ceiling.
Background technology
The application of pre-stress floor and cassette ceiling is very extensive, for meeting the demand that the mankind improve day by day to the comprehensive using function of building, along with the process of urbanization, increasing of highrise building, super-high buildings, the requirement of large span large bay structural system is also improved day by day, not only be required to meet safety, durability, more will meet the applicability of society.Existing cast-in-situ floorslab structure on the one hand deadweight is comparatively large, and can not realize large span and large bay structural system, existing large span large bay structural system adopts steel work to realize substantially, but comparatively concrete structure is poor due to steel work heat insulation effect, not energy-conservation.
Application number be 201310140093.3 Chinese patent document disclose a kind of large-span cast-in-situ prestressing without bondn hollow floor construction method, comprise the following steps: the first step: floor bottom mould is installed, carry out bed die installation according to designing requirement, bed die edge joint position two-sided tape is bonding; Second step: determine girt strip and LPM light pipe installation site, draw LPM installation site and girt strip sideline according to designing requirement on bed die surface; 3rd step: colligation girt strip reinforcing bar and floor slab bottoms reinforcing bar; 4th step: install positioning bar, fixed and arranged is for locating the positioning bar of prestressed reinforcement and LPM light pipe on the stirrup of girt strip; 5th step: lay prestressed reinforcement, prestressed reinforcement is communicated with ground tackle and accessory transports and stores according to after designing requirement blanking and assembling, and muscle to be positioned installs rear laying prestressed reinforcement; 6th step: water power pipeline laying; 7th step: lay LPM light pipe, according to design piping diagram lay LPM light pipe, LPM light pipe must not be greater than 12mm along tube hub line deviation, and LPM light pipe horizontal direction deviation must not be greater than 12mm; 8th step: Zhi Duanmo; 9th step: colligation floor plate face reinforcing bar; Tenth step: concreting and maintenance; 11 step: prestressed reinforcement stretch-draw.Described 7th step also comprises use n shape and fastens LPM light pipe, and it is peripheral that described n shape is fastened on LPM light pipe, and its lower end colligation is on floor slab bottoms reinforcing bar.
Prestressing force and cassette ceiling structure is adopted to combine the method for constructing to large span floor although existed in above-mentioned prior art, but existing construction method is ripe not enough, the operation that adopted core is fixed all is needed in existing cassette ceiling work progress, prevent core from misplacing, offset, and prevent from floating in concreting process.Above-mentioned adopted core is LPM pipe, its fixation is for establish on LPM pipe by n shape card card, and lower end colligation is on bottom reinforcement bars, although above-mentioned measure can play the effect preventing core from floating, but still there is the possibility of vertical misalignment in it, i.e. the length direction of reinforcing bar.When concreting, because core density is less, the buoyancy be subject to is very large, if without effective fixing, very easily offset, although n shape is arranged on LPM pipe, prevent from floating, but LPM pipe is laid along bottom reinforcement bars, reinforcing bar length direction does not but have fixation, easily offsets in concreting process.Core generation skew causes arrangement uneven, can cause unbalance stress on whole floor structure, have a strong impact on construction quality.
Summary of the invention
For the deficiency that prior art exists, the object of the present invention is to provide a kind of construction method of post-tensioning unbounded prestress cassette ceiling, it efficiently solves the deficiency of above-mentioned existence, core is steadily fixing, even structure, anti-floating anchoring is high, effectively improves the construction quality of prestressed hollow slab, meets the existing demand to large span large bay floor slab construction.
For achieving the above object, the invention provides following technical scheme: a kind of construction method of post-tensioning unbounded prestress cassette ceiling, comprises the following steps:
The first step: surveying setting-out is carried out to plan construction superstructure;
Second step: set up superstructure support for shuttering and installation form;
3rd step: in template, positioning marking is done to Vierendeel girder, core, set aside pre-embedded facility;
4th step: installing frame is set a roof beam in place, the reinforcing bar of plate bottom, and at the bottom of plate, square steel is installed, and make locating hole at square steel surface brill;
5th step: prestressed muscle;
6th step: install core on square steel, carries out horizontal location to core and applies anti-floating anchor measure;
7th step: install the keeper for preventing core from sliding on square steel on locating hole;
8th step: core installation quality is carried out an acceptance inspection;
9th step: carry out plate face reinforcement installation;
Tenth step: reinforcing bar concealment acceptance;
11 step: build superstructure concrete;
12 step: concrete curing;
13 step: tension of prestressed tendon and duct slip casting;
14 step: form removal.
Described core is fixed between adjacent two locating holes, described in be fixed on square steel between core to be provided with interval, described keeper is arranged at this interval, and the locating hole internal fixtion that described keeper inserts both sides, interval by bar bending is formed.
Anti-floating anchor measure described in 6th step is for carry out colligation by iron wire, and iron wire is coiling by the square steel bottom core, and climbs on the square steel of core colligation once again bottom core.
Described 13 step duct slip casting is in the duct that presstressed reinforcing steel is laid, inject cement paste after tension of prestressed tendon completes, and fills up the gap in duct after tension of prestressed tendon.
Described core is GBF thin-walled square chest.
Described 11 step, concrete slump should control at 160-180mm, and the maximum particle diameter of stone is less than 30mm, vibrates when building with diameter 30mm vibrating spear.
The mode that the present invention is combined by prestressing force and cassette ceiling structure, realizes the demand to large span large bay floor slab construction, and reaches dead load and alleviate, and amount of concrete reduces, and economic benefit is obvious, and floor good integrity, remarkable result is had in sound-insulating and heat-insulating, in the work progress of prestressed hollow slab, very important to fixing of core, directly have influence on construction quality, this programme by installing square steel at the bottom of plate, square steel surface is more smooth, put more neatly smooth for core during fixing core, to be walked around above core by iron wire and colligation on the square steel of bottom, play and fix core and anti-floating role at horizontal direction, locating hole is equipped with in two sidetrackings of square steel length direction in addition at core, core is fixed between two adjacent locating holes, all interval is provided with between existing core, namely the both sides at interval correspondence can be provided with locating hole, the present invention offsets for preventing core by arranging keeper at this interval on the length direction of square steel, reach the more effective fixation of core.Although because core can reach anti-floating and the effect preventing lateral shift by the mode of iron wire colligation, colligation is on reinforcing bar eventually for iron wire, and core still easily offsets in the length direction of reinforcing bar.Be fixed on bottom core by adopting square steel, square steel surface is more easily bored and is made locating hole, keeper is be made up of the locating hole internal fixtion of bar bending insertion both sides, interval, bar bending inserts in the locating hole of both sides, interval, this structure makes reinforcing bar have very strong elasticity, elasticity direction struts to both sides, makes it have better intensity, reliable for effect by inserting locating hole internal fixtion.This keeper plays position-limiting action to core, prevents it from sliding on square steel.The position of concreting process core mould is effectively fixed, neatly smooth, effectively ensure construction quality.
Accompanying drawing explanation
Fig. 1 is construction process figure of the present invention;
Fig. 2 is thin-walled square chest arrangement schematic diagram;
Fig. 3 is thin-walled square chest arrangement schematic side view.
Description of reference numerals: 1, square steel; 2, reinforcement; 3, thin-walled square chest; 4, keeper; 11, locating hole; 31, iron wire.
Detailed description of the invention
To be described in further detail in conjunction with the construction method of following specific embodiment to post-tensioning unbounded prestress cassette ceiling of the present invention referring to figs. 1 through Fig. 3.
The construction method of post-tensioning unbounded prestress cassette ceiling of the present invention, comprises the following steps:
The first step: surveying setting-out is carried out to plan construction superstructure;
Second step: set up superstructure support for shuttering and installation form;
3rd step: in template, positioning marking is done to Vierendeel girder, core, set aside pre-embedded facility;
4th step: installing frame is set a roof beam in place, the reinforcing bar of plate bottom, and at the bottom of plate, square steel is installed, and make locating hole at square steel surface brill;
5th step: prestressed muscle; By presstressed reinforcing steel position on plan, vertical elevation is controlled by being made into locating support with Ф 12mm reinforcement welding on the stirrup of girt strip, vertical height error controls within ± 10mm, unbonded prestressing tendon should strictly be laid on locating support by the requirement of design drawing, and keep straight, must not have dog leg, left-right deviation controls at ± 20mm.After presstressed reinforcing steel has been laid, in anchored end, plastic cushion and spiral bar etc. should be installed, and timely iron wire is fixed, and anchored end is fixed.
Construction point: avoid electric welding to be lost to presstressed reinforcing steel during construction, after presstressed reinforcing steel has been laid, operation field should reduce the number of times of electric welding as far as possible, forbids ground wire to be overlapped on presstressed reinforcing steel.
6th step: install core on square steel, carries out horizontal location to core and applies anti-floating anchor measure; Anti-floating anchor measure is for carry out colligation by iron wire, and iron wire climbs on the square steel of core colligation once again bottom core by square steel bottom core.Described core is GBF thin-walled square chest, also can be GBF pipe etc.
Construction point: the various built-in pipes in floor, should be laid on beam limit as far as possible, as walked in floor, and should be straight in the direction of GBF thin-walled square chest.
7th step: install the keeper for preventing core from sliding on square steel on locating hole; Described core is fixed between adjacent two locating holes, interval is provided with between the described core be fixed on square steel, described keeper is arranged at this interval, and the locating hole internal fixtion that described keeper inserts both sides, interval by bar bending is formed, and this bar bending described overarches.
8th step: core installation quality is carried out an acceptance inspection;
9th step: carry out plate face reinforcement installation;
Tenth step: reinforcing bar concealment acceptance;
11 step: build superstructure concrete; Concrete should adopt commercial concrete, and the concrete slump should control at 160-180mm, and the maximum particle diameter of stone must not more than 30mm, and application Ф 30mm handful of vibrating is vibrated.Placement layer by layer answered by concrete, concrete directly must not be cast in the top of GBF thin-walled square chest; Must not direct tamping unbonded prestressing tendon, support and GBF thin-walled square chest, in case the damage of presstressed reinforcing steel dislocation and GBF thin-walled square chest; The concrete at stretching end, fixed end place must vibration compacting.
12 step: concrete curing;
13 step: tension of prestressed tendon and duct slip casting; Before tension of prestressed tendon, must ensure that the intensity of floorslab concrete reaches 100% of design strength, the necessary vibration compacting of concrete, before stretch-draw completes, cave mould floor vertical supporting can not be removed.For avoiding the stress loss of mutual stretch-draw, can adopt " jumping a method ", namely carrying out stretch-draw every a method of one of drawing, in integral arrangement, adopt the symmetrical synchronous tension in presstressed reinforcing steel two ends, avoid component that eccentric torsion occurs in stretching process.Tension of prestressed tendon adopts stretching force and stretch value double control to carry out, to control pulling force during stretch-draw, simultaneously using elongation value of stretching as check foundation, the deviation of actual measurement stretch value and designing and calculating stretch value should within ± 6% scope, if find that actual elongation exceeds specification allowed band, stretch-draw should be stopped immediately, ascertain the reason and continue operation again after taking measures.Unnecessary presstressed reinforcing steel is cut by the method for machine cuts after stretch-draw, its length in reserve should be greater than 3cm from intermediate plate distance, end-blocking adopts the mode of double seal to carry out, once sealing is plastic cap on presstressed reinforcing steel end coating butter also cover, secondary seal fills the pea gravel concreten by a grade higher than structure at end-blocking, vibration compacting.
The slip casting of described duct is in the duct that presstressed reinforcing steel is laid, inject cement paste after tension of prestressed tendon completes, and fills up the gap in duct after tension of prestressed tendon.The object injecting cement paste in duct is that the presstressed reinforcing steel protected in superstructure avoids corrosion, and makes them mutually bonding with superstructure and formed overall.Tension of prestressed tendon, grouting methol, sealing off and covering anchorage should complete in 24 hours, and cement paste is by pneumatic mortar machine press-in duct.
14 step: form removal.
The mode that the present invention is combined by prestressing force and cassette ceiling structure, realizes the demand to large span large bay floor slab construction, and reaches dead load and alleviate, and amount of concrete reduces, and economic benefit is obvious, and floor good integrity, remarkable result is had in sound-insulating and heat-insulating, in the work progress of prestressed hollow slab, very important to fixing of core, directly have influence on construction quality, this programme by installing square steel at the bottom of plate, square steel surface is more smooth, put more neatly smooth for core during fixing core, to be walked around above core by iron wire and colligation on the square steel of bottom, play and fix core and anti-floating role at horizontal direction, locating hole is equipped with in two sidetrackings of square steel length direction in addition at core, core is fixed between two adjacent locating holes, all interval is provided with between existing core, namely the both sides at interval correspondence can be provided with locating hole, the present invention offsets for preventing core by arranging keeper at this interval on the length direction of square steel, reach the more effective fixation of core.Although because core can reach anti-floating and the effect preventing lateral shift by the mode of iron wire colligation, colligation is on reinforcing bar eventually for iron wire, and core still easily offsets in the length direction of reinforcing bar.Be fixed on bottom core by adopting square steel, square steel surface is more easily bored and is made locating hole, keeper is be made up of the locating hole internal fixtion of bar bending insertion both sides, interval, bar bending inserts in the locating hole of both sides, interval, this structure makes reinforcing bar have very strong elasticity, elasticity direction struts to both sides, makes it have better intensity, reliable for effect by inserting locating hole internal fixtion.This keeper plays position-limiting action to core, prevents it from sliding on square steel.The position of concreting process core mould is effectively fixed, neatly smooth, effectively ensure construction quality.
Claims (6)
1. a construction method for post-tensioning unbounded prestress cassette ceiling, is characterized in that: comprise the following steps:
The first step: surveying setting-out is carried out to plan construction superstructure;
Second step: set up superstructure support for shuttering and installation form;
3rd step: in template, positioning marking is done to Vierendeel girder, core, set aside pre-embedded facility;
4th step: installing frame is set a roof beam in place, the reinforcing bar of plate bottom, and at the bottom of plate, square steel is installed, and make locating hole at square steel surface brill;
5th step: prestressed muscle;
6th step: install core on square steel, carries out horizontal location to core and applies anti-floating anchor measure;
7th step: install the keeper for preventing core from sliding on square steel on locating hole;
8th step: core installation quality is carried out an acceptance inspection;
9th step: carry out plate face reinforcement installation;
Tenth step: reinforcing bar concealment acceptance;
11 step: build superstructure concrete;
12 step: concrete curing;
13 step: tension of prestressed tendon and duct slip casting;
14 step: form removal.
2. the construction method of post-tensioning unbounded prestress cassette ceiling according to claim 1, it is characterized in that: described core is fixed between adjacent two locating holes, interval is provided with between the described core be fixed on square steel, described keeper is arranged at this interval, and the locating hole internal fixtion that described keeper inserts both sides, interval by bar bending is formed.
3. the construction method of post-tensioning unbounded prestress cassette ceiling according to claim 1 and 2, it is characterized in that: the anti-floating anchor measure described in the 6th step is for carry out colligation by iron wire, iron wire is coiling by the square steel bottom core, and climbs on the square steel of core colligation once again bottom core.
4. the construction method of post-tensioning unbounded prestress cassette ceiling according to claim 3, it is characterized in that: described 13 step duct slip casting is in the duct that presstressed reinforcing steel is laid, inject cement paste after tension of prestressed tendon completes, and fills up the gap in duct after tension of prestressed tendon.
5. the construction method of post-tensioning unbounded prestress cassette ceiling according to claim 4, is characterized in that: described core is GBF thin-walled square chest.
6. the construction method of post-tensioning unbounded prestress cassette ceiling according to claim 5, it is characterized in that: described 11 step, concrete slump should control at 160-180mm, and the maximum particle diameter of stone is less than 30mm, vibrates when building with diameter 30mm vibrating spear.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410534654.2A CN104405068A (en) | 2014-10-11 | 2014-10-11 | Construction method of post-tensioned unbonded prestressed hollow floor slab |
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| CN201410534654.2A CN104405068A (en) | 2014-10-11 | 2014-10-11 | Construction method of post-tensioned unbonded prestressed hollow floor slab |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105587060A (en) * | 2015-12-23 | 2016-05-18 | 杭州江润科技有限公司 | Construction method for slowly-bonded hollow prestressing floor slab through large-span ultra-thick cast-in-place post-tensioning method |
| CN107419833A (en) * | 2016-06-24 | 2017-12-01 | 中建六局建设发展有限公司 | A kind of annular two-way double helix prestressing without bondn cored slab track construction method |
| CN108824684A (en) * | 2018-08-31 | 2018-11-16 | 中冶建工集团有限公司 | The anti-floating structure of inclining of cassette ceiling |
| CN110965685A (en) * | 2019-11-26 | 2020-04-07 | 上海二十冶建设有限公司 | Construction method of prestressed thick plate hollow floor |
| CN111608312A (en) * | 2020-05-21 | 2020-09-01 | 南通四建集团有限公司 | Tensioning node of T-beam wing plate under post-tensioning method with bonded prestressed rib plate and construction method |
| CN113756497A (en) * | 2021-10-19 | 2021-12-07 | 广东宏茂建设管理有限公司 | Concrete floor slab adopting hollow template and rapid construction method thereof |
| CN114000633A (en) * | 2021-09-17 | 2022-02-01 | 德润建安工程集团有限公司 | Anti-floating structure of cast-in-place concrete hollow floor and construction method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105587060A (en) * | 2015-12-23 | 2016-05-18 | 杭州江润科技有限公司 | Construction method for slowly-bonded hollow prestressing floor slab through large-span ultra-thick cast-in-place post-tensioning method |
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| CN108824684A (en) * | 2018-08-31 | 2018-11-16 | 中冶建工集团有限公司 | The anti-floating structure of inclining of cassette ceiling |
| CN110965685A (en) * | 2019-11-26 | 2020-04-07 | 上海二十冶建设有限公司 | Construction method of prestressed thick plate hollow floor |
| CN111608312A (en) * | 2020-05-21 | 2020-09-01 | 南通四建集团有限公司 | Tensioning node of T-beam wing plate under post-tensioning method with bonded prestressed rib plate and construction method |
| CN114000633A (en) * | 2021-09-17 | 2022-02-01 | 德润建安工程集团有限公司 | Anti-floating structure of cast-in-place concrete hollow floor and construction method thereof |
| CN113756497A (en) * | 2021-10-19 | 2021-12-07 | 广东宏茂建设管理有限公司 | Concrete floor slab adopting hollow template and rapid construction method thereof |
| CN113756497B (en) * | 2021-10-19 | 2022-11-04 | 广东宏茂建设管理有限公司 | Concrete floor slab adopting hollow template and rapid construction method thereof |
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Address after: Five, No. 74, No. 325000, Longteng Road, Wenzhou Town, Longwan District, Zhejiang Applicant after: ZHONGSHA CONSTRUCTION CO., LTD. Address before: Wenzhou City, Zhejiang Province town road 325000 South Kangyuan building 501 Applicant before: ZHONGSHA CONSTRUCTION CO., LTD. |
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