CN103469805B - The construction method of prestressing force raft foundation - Google Patents
The construction method of prestressing force raft foundation Download PDFInfo
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- CN103469805B CN103469805B CN201310420302.XA CN201310420302A CN103469805B CN 103469805 B CN103469805 B CN 103469805B CN 201310420302 A CN201310420302 A CN 201310420302A CN 103469805 B CN103469805 B CN 103469805B
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- raft foundation
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- trapezoidal groove
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- 238000010276 construction Methods 0.000 title claims abstract description 13
- 239000004567 concrete Substances 0.000 claims abstract description 45
- 230000002787 reinforcement Effects 0.000 claims description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 239000004744 fabric Substances 0.000 claims description 8
- 238000004873 anchoring Methods 0.000 claims description 6
- 239000011377 vacuum concrete Substances 0.000 claims description 5
- 230000008901 benefit Effects 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 210000000988 bone and bone Anatomy 0.000 abstract 1
- 210000003205 muscle Anatomy 0.000 abstract 1
- 230000011218 segmentation Effects 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 230000018044 dehydration Effects 0.000 description 8
- 238000006297 dehydration reaction Methods 0.000 description 8
- 239000010410 layer Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
- 229910052753 mercury Inorganic materials 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000005945 translocation Effects 0.000 description 1
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- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a kind of construction method of prestressing force raft foundation, it is characterized in that the pitched roof gradient being more than or equal to 20 °, adopt two-sided envelope method constructing and overhanging model, by installing pitched roof bed die and backform makes concrete build Constrained in gradient situation, bar dowel is adopted to do support between pitched roof bed die and backform, bar dowel diameter is 22 ~ 25mm, split bolt is adopted to unify between backform and bed die, split bolt diameter is 14 ~ 16mm, split bolt setting space is 250mm ~ 300mm, in the middle of split bolt, seal ring is set, seal ring diameter is 40 ~ 50mm, steel bar horse-shaped bench is set above bed die and bears muscles and bones frame to shelve top, take segmentation to water during concreting to smash, with concreting progress from bottom to top, close pitched roof upper mould step by step.
Description
Technical field
The present invention relates to a kind of raft foundation, particularly a kind of construction method of prestressing force raft foundation.
Background technology
The concrete scale of construction of raft foundation is comparatively large, easily occurs the heat of hydration, occurs checking at inside concrete, thus affect the bearing capacity of raft foundation in casting process.The means of vacuum operation can be adopted to carry out vacuum operation to concrete, make in the de-watering extrusion compacting process of concrete physical property on vacuum coagulation, inner moisture is discharged from surface through layer of concrete, has also driven part of cement particle to move to top layer.These particles are subject to the obstruction of filter cloth and the Surface layer's concrete of dense extrusion, be trapped in Surface layer's concrete or concrete table and, in addition top layer vacuum is greater than internal vacuum, dehydration rate on the coagulation of top layer and compression ratio are also much larger than inner concrete, thus surface forms compact texture layer, make porosity reduce by more than 3%, average pore size reduces 30%, and compressive strength can double.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of construction method of prestressing force raft foundation of reliable construction quality, overcomes the problem that crack appears in raft foundation.
Construction sequence of the present invention comprises:
(1) prepare burden
Raft foundation concrete carries out examination by traditional match ratio and joins, and then adjusts according to the feature of vacuum concrete, and concrete employing is as follows: cement consumption reduces by 8% ~ 10% than conventional cement consumption, and sand coarse aggregate ratio is higher than traditional sand coarse aggregate ratio 5%.
Sand coarse aggregate ratio is when in concrete mix, mortar amount is inadequate higher than traditional sand coarse aggregate ratio reason, and vacuum pressure mainly passes to above coarse aggregate, and the frictional force produced by dehydration and the build-in of coarse aggregate hinder further dehydration, are unfavorable for compression compact.
The slump of vacuum concrete has an optimum value, and the slump is too low, easily leaks gas during application of vacuum, not easily closely knit, and hole increases, and intensity reduces.The slump is too large, and residue water/binder ratio is also comparatively large, and easy laminated segregation, hole also increases, therefore intensity also reduces.So slump index is one of important parameter selecting vacuum concrete match ratio, slump value is determined according to ash collection ratio, here ash collection is than the ratio referring to cement weight and sandstone gross weight, specific as follows: ash collection is 5 centimetres than the best slump value being more than or equal to 0.3, ash collection is than being less than 0.3 and the best slump value being more than or equal to 0.28 is 6 centimetres, ash collection is than being less than 0.28 and the best slump value being more than or equal to 0.26 is 7 centimetres, ash collection is than being less than 0.26 and the best slump value being more than or equal to 0.24 is 8 centimetres, ash collection is 9 centimetres than the best slump value being less than 0.24.
(2) assembling reinforcement
To first eject reinforcement location line before reinforcing bar binding, guarantee that reinforcement location is accurate.The colligation of reinforcement foundation is wanted firmly, and the quantity that releases of threading off will meet the requirements.
(3) template is installed
Adopt the special template with vacuum mat.It is characterized in that template central authorities arrange suction pipe, suction pipe is fixed in template by flange, arrange trapezoidal groove in the middle part of template, trapezoidal groove bond length is 250-300mm, and trapezoidal groove minor face position arranges filter cloth, filter cloth extends to bottom trapezoidal groove, the long edge lengths of trapezoidal groove is 258-308mm, and trapezoidal groove height is 12-15mm, and trapezoidal groove hypotenuse position arranges rubber weather strip and closes, arrange air cushion plush copper in trapezoidal groove, the cavity between air cushion plush copper forms vacuum chamber.
Compared with traditional vacuum suction pad, in structure of the present invention, greatly, can ensure the effective squeezing action to concrete surface, soaking effect is good for air cushion plush copper and concrete contact area, and after water suction, concrete plastic strength is also high.The vacuum chamber that between plush copper, space is formed has certain height, and it is completely through each other, air-flow and current do not exist as in conventional plastic net because of twine interlock the drag effects that produces, therefore its vacuum is evenly distributed, each position concrete is squeezed comparatively even, and water flow is fast, and water suction is even and efficiency is high, when construction operation area is larger, its advantage is more obvious.
(4) concreting
Often building is highly that the concrete of 400 ~ 500mm carries out an application of vacuum, and vacuum processing time is 12/min, and vacuum adopts 650 ~ 700mm mercury column, and vacuum operation adopts the water suction of template Vertical dimension and concreting horizontal plane to absorb water to carry out simultaneously.
Higher vacuum causes larger pressure differential, and the squeezing action of vacuum is comparatively large, and water suction is fast, water absorption rate and volume compression amount all large.Vacuum is excessive, at the water suction initial stage, and too early formation fine grained layer and affect further soaking effect.Vacuum is too low, then absorbent time is long, and concrete plastic strength and early strength are also lower.Vacuum is relevant with concreting thickness with the vacuum operation time, and according to a large amount of engineering practice, the present invention is highly 650 ~ 700mm mercury column for the concrete of 400 ~ 500mm carries out the vacuum that vacuum operation adopts building, and the vacuum operation time is 12/min.This parameter obtains under temperature is 10 ~ 15 DEG C of conditions, if variations in temperature, the vacuum operation time will adjust, specific as follows: when temperature is 5 ~ 10 DEG C, and regulation coefficient adopts 1.1; When temperature is 15 ~ 20 DEG C, regulation coefficient adopts 0.9; When temperature is 20 ~ 25 DEG C, regulation coefficient adopts 0.85; When temperature is greater than 25 DEG C, regulation coefficient adopts 0.8.
(5) first time electric heat prestressing
After raft foundation concreting completes 1h, after raft foundation concrete has some strength, prestressed reinforcement adopts electric-heat prestressing, select three-phase low-voltage transformer, transformer should be equipped with variable resistor, simultaneously should with cooling device, the electric wire received prestressed reinforcement from electric heating transformer adopts insulation soft copper skein silk line.Carry out first time electrified regulation, electrified regulation 5min, sets up initial stress, is then fixed on bearing plate by prestressed reinforcement by anchoring piece.
Based on the feature of raft foundation, the present invention adopts electrified regulation stretch-draw, effectively ensure that prestressed stretch-draw effect, guarantees that load worked in coordination with by prestressed reinforcement and raft foundation concrete.
(6) second time application of vacuum
Start vacuum pump after first time electric heat prestressing 10min and carry out application of vacuum, vacuum processing time is 15/min, and vacuum adopts 600 ~ 650mm mercury column.Vacuum processing time parameter obtains under temperature is 10 ~ 15 DEG C of conditions, if variations in temperature, the vacuum operation time will adjust, specific as follows: when temperature is 5 ~ 10 DEG C, and regulation coefficient adopts 1.1; When temperature is 15 ~ 20 DEG C, regulation coefficient adopts 0.9; When temperature is 20 ~ 25 DEG C, regulation coefficient adopts 0.85; When temperature is greater than 25 DEG C, regulation coefficient adopts 0.8.
Concrete vacuum process, be a compression dehydration, the gas of inside concrete can be made again under suction function to produce volume expansion, and capillary tube aperture reduces, and produces Inner extrusion dehydration.Dehydration volume is always greater than concrete volume contraction.Exactly because rear portion dehydration leaves hole in concrete, the pressure reduction that they produce by negative pressure of vacuum is difficult to airtight.After prestressed stretch-draw, carry out vacuum operation, concrete can be impelled closely knit further.In addition, vacuum operation also contributes to the acceleration of water translocation process, improves concrete uniformity.
Suitably reduce vacuum in vacuum chamber during second time application of vacuum, this is that vacuum is conducive to the movement of particles of aggregates after reducing, thus reaches the effect of concrete packed uniform because after concrete dehydration, mobility reduces.
(7) second time electrified regulation, the power-off anchoring when tension reinforcing steel bar reaches the stretch value of regulation.Treat that reinforcing bar is cooled to normal temperature, check the stress in reinforcing bar with jack.Counter stress does not meet the requirements of and will carry out benefit stretch-draw, then nut and backing plate are welded.
(8) maintenance
Should be covered and moisture-keeping maintaining concrete within 12h after building.
(9) demoulding
The demoulding is carried out after concrete strength reaches 8 ~ 12MPa.
Concrete density of the present invention is higher, and raft foundation mechanical property is good.
Accompanying drawing explanation
Fig. 1 dedicated templates schematic diagram.
Accompanying drawing mark: 1, filter cloth, 2, air cushion plush copper, 3, suction pipe, 4, flange, 5, rubber weather strip, 6, template.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present embodiment is described in detail.
Certain engineering raft foundation thickness is 1.2m, and raft foundation area is 820M
2, be 14 story frame structure buildings.
The present embodiment construction sequence comprises:
(1) prepare burden
Raft foundation concrete carries out examination by traditional match ratio and joins, and then adjusts according to the feature of vacuum concrete, and concrete employing is as follows: cement consumption reduces by 8% ~ 10% than conventional cement consumption, and sand coarse aggregate ratio is higher than traditional sand coarse aggregate ratio 5%.Water: 175kg, cement: 398kg, sand: 566kg, stone: 1261kg.Water: 175kg, cement: 362kg, sand: 594kg, stone: 1261kg.Slump value is 9 centimetres.
(2) assembling reinforcement
To first eject reinforcement location line before reinforcing bar binding, guarantee that reinforcement location is accurate.The colligation of reinforcement foundation is wanted firmly, and the quantity that releases of threading off will meet the requirements.
(3) template is installed
Adopt the special template with vacuum mat, Fig. 1 is dedicated templates schematic diagram, it is characterized in that template 6 central authorities arrange suction pipe 3, suction pipe 3 is fixed on template 6 by flange 4, in the middle part of template 6, trapezoidal groove is set, trapezoidal groove bond length is 250mm, trapezoidal groove minor face position arranges filter cloth 1, filter cloth 1 extends to bottom trapezoidal groove, the long edge lengths of trapezoidal groove is 258mm, trapezoidal groove height is 12mm, trapezoidal groove hypotenuse position arranges rubber weather strip 5 and closes, air cushion plush copper 2 is set in trapezoidal groove, cavity between air cushion plush copper 2 forms vacuum chamber.
(4) concreting
Often building is highly that the concrete of 400 ~ 500mm carries out an application of vacuum, and vacuum processing time is 12/min, and vacuum adopts 680 mercury column, and vacuum operation adopts the water suction of template Vertical dimension and concreting horizontal plane to absorb water to carry out simultaneously.
(5) first time electric heat prestressing
After raft foundation concreting completes 1h, after raft foundation concrete has some strength, prestressed reinforcement adopts electric-heat prestressing, select three-phase low-voltage transformer, transformer should be equipped with variable resistor, simultaneously should with cooling device, the electric wire received prestressed reinforcement from electric heating transformer adopts insulation soft copper skein silk line.Carry out first time electrified regulation, electrified regulation 5min, sets up initial stress, then by anchoring piece, prestressed reinforcement is fixed on bearing plate.
(6) second time application of vacuum
Start vacuum pump after first time electric heat prestressing 10min and carry out application of vacuum, vacuum processing time is 15/min, and vacuum adopts 620mm mercury column.
(7) second time electrified regulation, the power-off anchoring when tension reinforcing steel bar reaches the stretch value of regulation.Treat that reinforcing bar is cooled to normal temperature, check the stress in reinforcing bar with jack.Counter stress does not meet the requirements of and will carry out benefit stretch-draw, then nut and backing plate are welded.
(8) maintenance
Should be covered and moisture-keeping maintaining concrete within 12h after building.
(9) demoulding
The demoulding is carried out after concrete strength reaches 8 ~ 12MPa.
Claims (2)
1. a construction method for prestressing force raft foundation, is characterized in that construction sequence comprises:
(1) prepare burden
Raft foundation concrete carries out examination by traditional match ratio and joins, then adjust according to the feature of vacuum concrete, concrete employing is as follows: cement consumption reduces by 8% ~ 10% than conventional cement consumption, and sand coarse aggregate ratio is higher than traditional sand coarse aggregate ratio 5%, and slump value is determined according to ash collection ratio;
(2) assembling reinforcement
To first eject reinforcement location line before reinforcing bar binding, guarantee that reinforcement location is accurate; The colligation of reinforcement foundation is wanted firmly, and the quantity that releases of threading off will meet the requirements;
(3) template is installed
Adopt the special template with vacuum mat, it is characterized in that template central authorities arrange suction pipe, suction pipe is fixed in template by flange, in the middle part of template, trapezoidal groove is set, trapezoidal groove minor face position arranges filter cloth, and filter cloth extends to bottom trapezoidal groove, and trapezoidal groove hypotenuse position arranges rubber weather strip and closes, arrange air cushion plush copper in trapezoidal groove, the cavity between air cushion plush copper forms vacuum chamber;
(4) concreting
Often build is highly that the concrete of 400 ~ 500mm carries out an application of vacuum;
(5) first time electric heat prestressing
After raft foundation concreting completes 1h, after raft foundation concrete has some strength, prestressed reinforcement adopts electric-heat prestressing, select three-phase low-voltage transformer, transformer should be equipped with variable resistor, simultaneously should with cooling device, the electric wire received prestressed reinforcement from electric heating transformer adopts insulation soft copper skein silk line; Carry out first time electrified regulation, electrified regulation 5min, sets up initial stress, is then fixed on bearing plate by anchoring piece by prestressed reinforcement;
(6) second time application of vacuum
Start vacuum pump after electric heat prestressing for the first time and carry out application of vacuum;
(7) second time electrified regulation, the power-off anchoring when tension reinforcing steel bar reaches the stretch value of regulation; Treat that reinforcing bar is cooled to normal temperature, check the stress in reinforcing bar with jack; Counter stress does not meet the requirements of and will carry out benefit stretch-draw, then nut and backing plate are welded;
(8) maintenance
Should be covered and moisture-keeping maintaining concrete within 12h after building;
(9) demoulding
The demoulding is carried out after concrete strength reaches 8 ~ 12MPa.
2. the construction method of prestressing force raft foundation according to claim 1, it is characterized in that ash collection is 5 centimetres than the best slump value being more than or equal to 0.3, ash collection is than being less than 0.3 and the best slump value being more than or equal to 0.28 is 6 centimetres, ash collection is than being less than 0.28 and the best slump value being more than or equal to 0.26 is 7 centimetres, ash collection is than being less than 0.26 and the best slump value being more than or equal to 0.24 is 8 centimetres, and it is 9 centimetres that ash collects than the best slump value being less than 0.24.
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| CN201310420302.XA CN103469805B (en) | 2013-09-10 | 2013-09-10 | The construction method of prestressing force raft foundation |
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| CN201310420302.XA CN103469805B (en) | 2013-09-10 | 2013-09-10 | The construction method of prestressing force raft foundation |
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| CN103469805A CN103469805A (en) | 2013-12-25 |
| CN103469805B true CN103469805B (en) | 2015-07-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106836604B (en) * | 2017-02-07 | 2022-08-12 | 叶长青 | Method for manufacturing large-span inclined roof |
| CN107869147B (en) * | 2017-11-21 | 2020-07-03 | 中建八局第三建设有限公司 | Construction method of overlength prestressed raft |
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| KR20070000264A (en) * | 2005-06-27 | 2007-01-02 | 두산중공업 주식회사 | Building constuction method using precast structure |
| CN101476324A (en) * | 2009-01-20 | 2009-07-08 | 叶长青 | Raft plate base and its construction method |
| CN101476286A (en) * | 2008-11-24 | 2009-07-08 | 中铁二局股份有限公司 | Railway bridge deck prestressed concrete vertical and horizontal girder lattice type floating system construction method |
| CN102011366A (en) * | 2009-12-29 | 2011-04-13 | 中交第一航务工程局有限公司 | Construction method for mud jacking of post-tensioning pre-stressed concrete box girder pipe |
| CN102828468A (en) * | 2012-09-13 | 2012-12-19 | 永升建设集团有限公司 | Construction method for controlling prefabricated crack of high-strength thin-walled box girder under high-temperature dry condition |
| CN103147400A (en) * | 2013-03-01 | 2013-06-12 | 天津第四市政建筑工程有限公司 | One-time tensioning construction method of super-long prestressed tendon for cast-in-place box girder bridge web |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06212645A (en) * | 1992-12-19 | 1994-08-02 | Yasuhiro Matsukawa | Use of existing concrete for architectural foundation |
| JP2002294722A (en) * | 2001-03-29 | 2002-10-09 | Okumura Corp | Foundation structure of structure and its construction method |
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2013
- 2013-09-10 CN CN201310420302.XA patent/CN103469805B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070000264A (en) * | 2005-06-27 | 2007-01-02 | 두산중공업 주식회사 | Building constuction method using precast structure |
| CN101476286A (en) * | 2008-11-24 | 2009-07-08 | 中铁二局股份有限公司 | Railway bridge deck prestressed concrete vertical and horizontal girder lattice type floating system construction method |
| CN101476324A (en) * | 2009-01-20 | 2009-07-08 | 叶长青 | Raft plate base and its construction method |
| CN102011366A (en) * | 2009-12-29 | 2011-04-13 | 中交第一航务工程局有限公司 | Construction method for mud jacking of post-tensioning pre-stressed concrete box girder pipe |
| CN102828468A (en) * | 2012-09-13 | 2012-12-19 | 永升建设集团有限公司 | Construction method for controlling prefabricated crack of high-strength thin-walled box girder under high-temperature dry condition |
| CN103147400A (en) * | 2013-03-01 | 2013-06-12 | 天津第四市政建筑工程有限公司 | One-time tensioning construction method of super-long prestressed tendon for cast-in-place box girder bridge web |
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Inventor after: Li Limin Inventor before: Ye Changqing |
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Effective date of registration: 20160527 Address after: 330200, Jiangxi, Nanchang province Nanchang County Jing Tong Township Government Office Building Patentee after: JIANGXI ZHONGWEI CONSTRUCTION GROUP CO., LTD. Address before: 325000 Jinchuan economic and Technological Development Zone, Tianhe Road, Wenzhou, No. 4 Zhejiang Road Patentee before: Ye Changqing |
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