CN103225402A - Construction method for long-span cast-in-situ unbonded prestressed hollow floor slabs - Google Patents
Construction method for long-span cast-in-situ unbonded prestressed hollow floor slabs Download PDFInfo
- Publication number
- CN103225402A CN103225402A CN2013101400933A CN201310140093A CN103225402A CN 103225402 A CN103225402 A CN 103225402A CN 2013101400933 A CN2013101400933 A CN 2013101400933A CN 201310140093 A CN201310140093 A CN 201310140093A CN 103225402 A CN103225402 A CN 103225402A
- Authority
- CN
- China
- Prior art keywords
- lpm
- light pipe
- prestressed reinforcement
- floor
- situ
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a construction method for long-span cast-in-situ unbonded prestressed hollow floor slabs. The method comprises the following steps: step 1, installing a floor slab soffit formwork; step 2, determining the installation position of ribbed beams and LPM light tubes, and drawing the installation position of the LPM light tubes and the side lines of the ribbed beams on the surface of the soffit formwork according to the design requirement; step 3, binding ribbed beam reinforcement bars and floor slab bottom reinforcement bars; step 4, installing positioning bars; step 5, laying prestressed reinforcement bars; step 6, laying hydropower pipelines; step 7, laying the LPM light tubes; step 8, erecting an end formwork; step 9, binding floor slab panel reinforcement bars; step 10, pouring and maintaining concrete; and step 11, tensioning the prestressed reinforcement bars. The construction method has the advantages that as the LPM light tubes are additionally arranged in the middle part of the floor slabs, on the one hand, the dead load of the floor slabs is reduced, and the construction of long-span building structures is realized; on the other hand, the thermal insulation properties of buildings are ensured; and the prestressed method is adopted in the floor slab construction process, the strength of the floor slabs is enhanced, and the safety and the durability of the floor slabs are ensured.
Description
Technical field
The present invention relates to a kind of building floor job practices technical field, especially a kind of large-span cast-in-situ prestressing without bondn hollow floor job practice.
Background technology
For satisfying the human demand that the comprehensive function of use of building is improved day by day, along with the capital of urbanization, the increasing of highrise building, super-high buildings also improved day by day to the requirement of large span large bay structural system, not only require to satisfy safety, durability, more will satisfy the applicability of society.Existing cast-in-situ floorslab structure is conducted oneself with dignity bigger on the one hand, can not realize large span and large bay structural system, and existing large span large bay structural system adopts steel work to realize substantially, but because the steel work heat insulation effect is poor than concrete structure, not energy-conservation.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of large-span cast-in-situ prestressing without bondn hollow floor job practice, by in floor, using the LPM thistle board to reduce its deadweight, by adopting prestressed stretch-draw worker method to strengthen floor strength, when realizing the long span building structure, improve building safety, durability, more energy-conservation.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of large-span cast-in-situ prestressing without bondn hollow floor job practice may further comprise the steps:
The first step: floor bottom mould is installed, and carries out bed die according to designing requirement and installs, and the bed die edge joint position is bonding with two-sided tape;
Second step: determine girt strip and LPM light pipe installation site, according to designing requirement draw on the bed die surface LPM installation site and girt strip sideline;
The 3rd step: colligation girt strip reinforcing bar and floor slab bottoms reinforcing bar;
The 4th step: the installing and locating muscle, fixed and arranged is used to locate the positioning bar of prestressed reinforcement and LPM light pipe on the stirrup of girt strip;
The 5th step: the lay prestressed reinforcement, prestressed reinforcement is according to the designing requirement blanking and the assembling back is communicated with ground tackle and accessory transports and stores, and muscle to be positioned installs the back and lays prestressed reinforcement;
The 6th step: water power pipeline laying;
The 7th step: lay LPM light pipe, according to design piping diagram lay LPM light pipe, the 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;
The 8th step: Zhi Duanmo;
The 9th step: colligation floor plate face reinforcing bar;
The tenth step: concrete pouring and maintenance;
The 11 step: prestressed reinforcement stretch-draw.
Described the 3rd step is included on the bed die places the plastic protective layer cushion block, puts distribution bar at the bottom of the plate then, ties up girt strip reinforcing bar and stirrup up and down again, reinforcing bar at the bottom of the plate at last colligation LPM light pipe position.
Described positioning bar is divided into prestressed reinforcement positioning bar and LPM light pipe positioning bar, and the spacing between the prestressed reinforcement positioning bar is 1.5m, adopts the reinforcement fabrication of diameter 12mm.
The vertical direction allowable variation of the prestressed reinforcement of lay is ± 5mm that the horizontal direction allowable variation is ± 20mm in described the 5th step.
Described the 7th step also comprises uses n shape to fasten the LPM light pipe, and described n shape card is fastened on LPM light pipe periphery, and its lower end colligation is to the floor slab bottoms reinforcing bar.
Described the tenth step is during fluid concrete, make two bites at a cherry, stop fluid concrete to slab thickness two/a period of time for the first time, treating that the first floor concrete is in solidifies but cast residue 1/2nd before the initial set not, in casting process, must vibrate, the place's time of vibrating should not surpass 5s, and the spacing of vibrating is less than 0.3m.
After finishing, described prestressed reinforcement stretch-draw use emery wheel with the prestressed reinforcement exposed parts.
Beneficial effect of the present invention is as follows:
(1) by setting up the LPM light pipe, reduces the floor deadweight on the one hand, realize the construction of long span building structure, guarantee the building heat preserving performance in addition on the one hand at the floor middle part;
(2) by in the floor slab construction process, adopting prestressing force worker method, strengthen floor strength, guarantee its safety and durability.
Description of drawings
Fig. 1 is construction process figure of the present invention.
The specific embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
In sum, the invention discloses a kind of large-span cast-in-situ prestressing without bondn hollow floor job practice, may further comprise the steps (as shown in Figure 1):
The first step: floor bottom mould is installed, and carries out bed die according to designing requirement and installs, and the bed die edge joint position is bonding with two-sided tape;
Second step: determine girt strip and LPM light pipe installation site, according to designing requirement draw on the bed die surface LPM installation site and girt strip sideline;
The 3rd step: colligation girt strip reinforcing bar and floor slab bottoms reinforcing bar; Be included on the bed die and place the plastic protective layer cushion block, put distribution bar at the bottom of the plate then, tie up girt strip reinforcing bar and stirrup up and down again, reinforcing bar at the bottom of the plate at last colligation LPM light pipe position.
The 4th step: the installing and locating muscle, fixed and arranged is used to locate the positioning bar of prestressed reinforcement and LPM light pipe on the stirrup of girt strip; Described positioning bar is divided into prestressed reinforcement positioning bar and LPM light pipe positioning bar, and the spacing between the prestressed reinforcement positioning bar is 1.5m, adopts the reinforcement fabrication of diameter 12mm; For guaranteeing the rise and the curve of prestressed reinforcement, positioning bar is set every about 1.5m one in plate, make the positioning bar of prestressed reinforcement in advance, the stirrup colligation of girt strip or weld together in positioning bar and the LPM thistle board.
The 5th step: the lay prestressed reinforcement, prestressed reinforcement is according to the designing requirement blanking and the assembling back is communicated with ground tackle and accessory transports and stores, and muscle to be positioned installs the back and lays prestressed reinforcement; The vertical direction allowable variation of the prestressed reinforcement of lay is ± 5mm, the horizontal direction allowable variation is ± 20mm, it is straight that the position of prestressed reinforcement should keep, the bearing plate face must be vertical with the stretch-draw position, the groups of nodes piece installing is installed firmly, must not leave the gap, after no-cohesive prestressed reinforcement lay, location are errorless on inspection, can carry out the water power spool and lay installation with non-prestressed surfacing steel bar.
The 6th step: water power pipeline laying, in the water power pipeline laying process, the pipe that diameter is not more than 20mm is bottom flange on floor incessantly, diameter is arranged in rib of slab and the girt strip greater than the pipe of 20mm, there is the place of LPM light pipe should be with the superior horizontal flat vertical lay of water power pipe, when laterally being vertical LPM light pipe, the joining place of the two ends solid area of should trying one's best away or twice LPM light pipe, if can't implement and on the LPM light pipe, to install by differential trench open, and repair the LPM light pipe.
The 7th step: lay LPM light pipe, according to design piping diagram lay LPM light pipe, the 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; Also comprise and use n shape to fasten the LPM light pipe, described n shape card is fastened on LPM light pipe periphery, its lower end colligation is to the floor slab bottoms reinforcing bar, because LPM light pipe weight is less, concrete buoyancy is bigger when fluid concrete, LPM light pipe come-up displacement when preventing fluid concrete, use n shape card with LPM light pipe and plate at the bottom of on the reinforcing bar.
The 8th step: Zhi Duanmo, the end mould generally adopts bamboo bakelite template, is convenient to construction, in installation process, should on the end mould, punch according to the prestressed reinforcement relevant position of working drawing, the aperture is 25-30mm, and during mounting template, this circular hole should be corresponding with the prestressed reinforcement extended position;
The 9th step: colligation floor plate face reinforcing bar, when floor plate face reinforcing bar binding, the LPM light pipe has been placed and has been finished,, should avoid direct punching press LPM light pipe, at first the length of lay LPM light pipe ejecting plate face to and longitudinal reinforcement, repave and put the short longitudinal reinforcement, the height of top reinforcement has the split heads muscle of intercostal to control, when assembling reinforcement or fluid concrete, should set up built on stilts packway, forbid construction equipment directly is placed on the LPM light pipe;
The tenth step: concrete pouring and maintenance; When fluid concrete, make two bites at a cherry, stop fluid concrete to slab thickness two/a period of time for the first time, treating that the first floor concrete is in solidifies but cast residue 1/2nd before the initial set not, in casting process, must vibrate, the place's time of vibrating should not surpass 5s, and the spacing of vibrating is less than 0.3m.
The 11 step: prestressed reinforcement stretch-draw, after finishing, described prestressed reinforcement stretch-draw use emery wheel with the prestressed reinforcement exposed parts, prestressed stretch-draw adopts conventional stretch-draw construction method, the stretch-draw of prestressed reinforcement should reach designing requirement stretch-draw intensity at concrete and can carry out after more than 90%, block the fluid pressure type jack before adopting YCN25, stretching process is: measure the prestressed reinforcement initial length, ground tackle is installed, jack, stretch-draw, locking ground tackle are installed, withdraw from jack, check the prestressed reinforcement stretch value, are measured prestressed reinforcement intermediary length and finish stretch-draw.
The present invention reduces the floor deadweight on the one hand by setting up the LPM light pipe at the floor middle part, realizes the construction of long span building structure, guarantees the building heat preserving performance in addition on the one hand; By in the floor slab construction process, adopting prestressing force worker method, strengthen floor strength, guarantee its safety and durability.
Claims (7)
1. large-span cast-in-situ prestressing without bondn hollow floor job practice is characterized in that: may further comprise the steps:
The first step: floor bottom mould is installed, and carries out bed die according to designing requirement and installs, and the bed die edge joint position is bonding with two-sided tape;
Second step: determine girt strip and LPM light pipe installation site, according to designing requirement draw on the bed die surface LPM installation site and girt strip sideline;
The 3rd step: colligation girt strip reinforcing bar and floor slab bottoms reinforcing bar;
The 4th step: the installing and locating muscle, fixed and arranged is used to locate the positioning bar of prestressed reinforcement and LPM light pipe on the stirrup of girt strip;
The 5th step: the lay prestressed reinforcement, prestressed reinforcement is according to the designing requirement blanking and the assembling back is communicated with ground tackle and accessory transports and stores, and muscle to be positioned installs the back and lays prestressed reinforcement;
The 6th step: water power pipeline laying;
The 7th step: lay LPM light pipe, according to design piping diagram lay LPM light pipe, the 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;
The 8th step: Zhi Duanmo;
The 9th step: colligation floor plate face reinforcing bar;
The tenth step: concrete pouring and maintenance;
The 11 step: prestressed reinforcement stretch-draw.
2. large-span cast-in-situ prestressing without bondn hollow floor job practice according to claim 1; it is characterized in that: described the 3rd step is included in and places the plastic protective layer cushion block on the bed die; put distribution bar at the bottom of the plate then; tie up girt strip reinforcing bar and stirrup up and down again, reinforcing bar at the bottom of the plate at last colligation LPM light pipe position.
3. large-span cast-in-situ prestressing without bondn hollow floor job practice according to claim 1, it is characterized in that: described positioning bar is divided into prestressed reinforcement positioning bar and LPM light pipe positioning bar, spacing between the prestressed reinforcement positioning bar is 1.5m, adopts the reinforcement fabrication of diameter 12mm.
4. large-span cast-in-situ prestressing without bondn hollow floor job practice according to claim 1 is characterized in that: the vertical direction allowable variation of the prestressed reinforcement of lay is ± 5mm that the horizontal direction allowable variation is ± 20mm in described the 5th step.
5. large-span cast-in-situ prestressing without bondn hollow floor job practice according to claim 1, it is characterized in that: described the 7th step also comprises uses n shape to fasten the LPM light pipe, described n shape card is fastened on LPM light pipe periphery, and its lower end colligation is to the floor slab bottoms reinforcing bar.
6. large-span cast-in-situ prestressing without bondn hollow floor job practice according to claim 1, it is characterized in that: described the tenth step is during fluid concrete, make two bites at a cherry, stop fluid concrete to slab thickness two/a period of time for the first time, treating that the first floor concrete is in solidifies but cast residue 1/2nd before the initial set not, must vibrate in casting process, the place's time of vibrating should not surpass 5s, and the spacing of vibrating is less than 0.3m.
7. large-span cast-in-situ prestressing without bondn hollow floor job practice according to claim 1 is characterized in that: use emery wheel with the prestressed reinforcement exposed parts after described prestressed reinforcement stretch-draw is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101400933A CN103225402A (en) | 2013-04-22 | 2013-04-22 | Construction method for long-span cast-in-situ unbonded prestressed hollow floor slabs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101400933A CN103225402A (en) | 2013-04-22 | 2013-04-22 | Construction method for long-span cast-in-situ unbonded prestressed hollow floor slabs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103225402A true CN103225402A (en) | 2013-07-31 |
Family
ID=48836024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101400933A Pending CN103225402A (en) | 2013-04-22 | 2013-04-22 | Construction method for long-span cast-in-situ unbonded prestressed hollow floor slabs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103225402A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410329A (en) * | 2013-08-30 | 2013-11-27 | 南通八建集团有限公司 | Large-span basement concrete roof structure flat tube bonded prestressing force construction method |
| CN104141356A (en) * | 2013-12-17 | 2014-11-12 | 中国建筑第四工程局有限公司 | Anti-floating method and structure for LPM (lumped plasticity model) hollow die construction |
| CN108265868A (en) * | 2016-12-30 | 2018-07-10 | 北京市第五建筑工程集团有限公司 | The construction method of light pipe combination block cast-in-place hollow slab |
| CN115095141A (en) * | 2022-06-21 | 2022-09-23 | 济南城建集团有限公司 | Construction method for lightweight structure of large-span tunnel roof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0061919A2 (en) * | 1981-03-31 | 1982-10-06 | Michael Townley Rawlings | Improvements in commercial vehicle bodies |
| CN1278574A (en) * | 2000-07-18 | 2001-01-03 | 邱则有 | In-situ deposited prestressed hollow reinforced concrete roof and its construction process |
-
2013
- 2013-04-22 CN CN2013101400933A patent/CN103225402A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0061919A2 (en) * | 1981-03-31 | 1982-10-06 | Michael Townley Rawlings | Improvements in commercial vehicle bodies |
| CN1278574A (en) * | 2000-07-18 | 2001-01-03 | 邱则有 | In-situ deposited prestressed hollow reinforced concrete roof and its construction process |
Non-Patent Citations (2)
| Title |
|---|
| 邱金端等: "无粘结预应力LPM轻质管空心板施工技术", 《建筑技术》, vol. 41, no. 12, 31 December 2010 (2010-12-31), pages 1087 - 1089 * |
| 马建光等: "现浇混凝土无黏结预应力LPM轻质管空心楼盖施工技术", 《施工技术》, vol. 40, 30 June 2011 (2011-06-30), pages 1 - 4 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410329A (en) * | 2013-08-30 | 2013-11-27 | 南通八建集团有限公司 | Large-span basement concrete roof structure flat tube bonded prestressing force construction method |
| CN103410329B (en) * | 2013-08-30 | 2015-04-15 | 南通八建集团有限公司 | Large-span basement concrete roof structure flat tube bonded prestressing force construction method |
| CN104141356A (en) * | 2013-12-17 | 2014-11-12 | 中国建筑第四工程局有限公司 | Anti-floating method and structure for LPM (lumped plasticity model) hollow die construction |
| CN104141356B (en) * | 2013-12-17 | 2017-02-22 | 中国建筑第四工程局有限公司 | Anti-floating method and structure for LPM (lumped plasticity model) hollow die construction |
| CN108265868A (en) * | 2016-12-30 | 2018-07-10 | 北京市第五建筑工程集团有限公司 | The construction method of light pipe combination block cast-in-place hollow slab |
| CN115095141A (en) * | 2022-06-21 | 2022-09-23 | 济南城建集团有限公司 | Construction method for lightweight structure of large-span tunnel roof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105888108B (en) | Built-in positioning prefabricated component reinforced concrete shear wall and construction method | |
| CN110439137B (en) | Prefabricated wall board, wall body, prefabricated wall board production method and prefabricated wall body construction method | |
| CN207582764U (en) | A kind of close spelling laminated floor slab connecting joint structure of end fluting | |
| CN104405068A (en) | Construction method of post-tensioned unbonded prestressed hollow floor slab | |
| CN103225402A (en) | Construction method for long-span cast-in-situ unbonded prestressed hollow floor slabs | |
| CN103410269A (en) | Unbonded prestress cast-in-place reinforced concrete hollow slab construction structure and method | |
| WO2015184476A1 (en) | Precast concrete falsework bubbledeck element and process of manufacturing thereof | |
| CN217557315U (en) | Antidetonation coincide wall | |
| CN110630011A (en) | Template reinforcing system for double shear walls at deformation joint and construction method thereof | |
| CN113216252A (en) | Expansion joint reinforcing device and method for multi-section continuous casting of underground pipe gallery | |
| CN202324606U (en) | U-shaped force bearing seat | |
| CN104863296A (en) | Integrally modular steel bar truss floor plate and construction method thereof | |
| CN210976588U (en) | Template reinforcing system for double shear walls at deformation joint | |
| CN111734027A (en) | Foam steel floor slab with fixing structure and fixing method | |
| CN202012153U (en) | Steel bar positioning fixture | |
| CN205976167U (en) | Based on cast -in -place floor structures of detachable positioning control spare | |
| KR101395114B1 (en) | Precast panel with corrugated steel web psc girder slab structure | |
| CN103603494B (en) | A kind of ultra-thin steel truss sloping core construction method and formwork structure | |
| CN110644662A (en) | Prefabricated flat slab composite slab based on stress and splitting method thereof | |
| CN207812307U (en) | The construction system of Cable stayed Bridge Main Tower and steel anchor beam | |
| CN106906933A (en) | A kind of two-way steel plate concrete composite floor | |
| CN213806067U (en) | Steel bar truss prestressed concrete superimposed sheet | |
| CN113530053A (en) | Channel steel is consolidated and is exempted from truss reinforcing bar superimposed sheet | |
| KR100865133B1 (en) | A fixing device, a pre-fabricating forms for concrete-structure and the construction method thereof | |
| CN102605945B (en) | Manufacturing method of big wood formwork |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130731 |