CN107023170A - Post stretching bonded prestress construction - Google Patents
Post stretching bonded prestress construction Download PDFInfo
- Publication number
- CN107023170A CN107023170A CN201710199062.3A CN201710199062A CN107023170A CN 107023170 A CN107023170 A CN 107023170A CN 201710199062 A CN201710199062 A CN 201710199062A CN 107023170 A CN107023170 A CN 107023170A
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- Prior art keywords
- grouting
- reinforcing steel
- presstressed reinforcing
- cement
- post stretching
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/121—Construction of stressing jacks
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a kind of post stretching bonded prestress construction, including step 1, duct shaping；Step 2, concreting；Step 3, presstressed reinforcing steel lashing；Step 4, tension of prestressed tendon is anchored；Step 5, duct grouting and sealing off and covering anchorage.The present invention has advantages below and effect：Using post stretching bonded prestress construction, compared to normal concrete structure, the consumption of template, reinforcing bar and concrete is reduced, tensioning, grouting do not account for the duration；Compared to Unbonded prestressed, with better structural behaviour, presstressed reinforcing steel can be saved, mitigate building weight, save construction costs, building is set to realize large span, the structure type of large pillar net, flexibility and usable floor area that increase architectural plane is used have reached and do not accounted for the duration, save construction material, reduce the amount of labour used, save construction costs, prevent presstressed reinforcing steel corrosion, the effect of the performance of improvement concrete component.
Description
Technical field
The present invention relates to construction engineering method, more particularly to a kind of post stretching bonded prestress construction.
Background technology
Post stretching refers to first casting concrete, and presses the corresponding empty island of position outflow of presstressed reinforcing steel in component body, treats
The concrete strength of component is reached after defined intensity, and presstressed reinforcing steel is penetrated in reserving hole channel and carries out tensioning, and utilizes anchorage
Presstressed reinforcing steel after tensioning is anchored at the end of component, transmitted the prestressing force of presstressed reinforcing steel by the anchorage of component ends
To concrete, it is produced compressive pre-stress, cement mortar is finally poured into reserving hole channel, makes presstressed reinforcing steel and concrete component shape
It is integral.Post stretching bonded prestressed concrete technology is by pre-buried pipeline, wears the processes such as muscle, tensioning, grouting for coagulation
Soil structure sets up prestressing force to meet design requirement.By tensioned prestressing bar, compressive pre-stress is produced in concrete component,
Post-grouting is pulled, makes presstressed reinforcing steel and concrete reliable bond, the strength of materials is given full play to and has set up compressive pre-stress
Preferably ensure.
In the prior art, poured into reserving hole channel after cement mortar, although presstressed reinforcing steel can be made to be formed with concrete component
It is overall, but inevitably there is hole after cement slurry sets, the moisture and air in external environment in a humidity environment
Easily by the hole in cement mortar, presstressed reinforcing steel is touched, presstressed reinforcing steel corrosion is easily caused.Such as it is disclosed in《Construction material
Journal》The scientific and technical literature " research of corrosion presstressed reinforcing steel mechanical property " of 2 phases (in April, 2010) of volume 13, is just answered particular for pre-
Power muscle mechanical property degradation rule is studied.Therefore, it is necessary to propose that a kind of post stretching for preventing presstressed reinforcing steel corrosion has viscous
Tie pre-stress construction engineering method.
The content of the invention
It is an object of the invention to provide a kind of post stretching bonded prestress construction, with preventing presstressed reinforcing steel corrosion
Effect.
The present invention above-mentioned technical purpose technical scheme is that：A kind of post stretching, which has to bond, in advance should
Power construction, comprises the following steps, step 1, duct shaping, and after framework of steel reinforcement welding fabrication, ripple is fixed on framework of steel reinforcement
Line pipe；Step 2, concreting, casting concrete prepares concrete component；Step 3, presstressed reinforcing steel lashing, in concrete structure
Part penetrates presstressed reinforcing steel during conserving；Step 4, tension of prestressed tendon is anchored, and installs anchorage, grading tension, presstressed reinforcing steel two ends
Successively anchor；Step 5, duct grouting and sealing off and covering anchorage, preparing includes portland cement, organosilicon, silicon in Grouting Cement, Grouting Cement
The ratio of mud of titanium polymer/montmorillonite composite material, wherein Grouting Cement is not more than 0.4, with Grouting Cement to concrete component
Interior duct grouting, grouting finishes rear sealing off and covering anchorage.
By using above-mentioned technical proposal, post stretching bonded prestress construction, step 1, duct shaping use ripple
Pipe is used as preserved pipeline.Step 2, casting concrete, prepares concrete component.Step 3, presstressed reinforcing steel lashing, in concrete structure
Lashing during part is conserved, does not account for the duration.Step 4, tension of prestressed tendon is anchored.
Step 5, duct grouting and sealing off and covering anchorage.Silicon titanium polymer/Nano composite material of montmorillonite, polymerization are added in Grouting Cement
Thing/laminated nm-silicate composite material is that, using organic polymer as matrix, phyllosilicate is received for the organic and inorganic of dispersed phase
Nano composite material, using the interlayer spacing of phyllosilicate, makes polymer macromolecule intercalation enter its interlayer, forms nanoscale
Laminated nano composition.
Montmorillonite is a kind of mineral with layer structure, its main component be between phyllosilicate, its lamella away from
From only 1nm or so.Silicon titanium polymer/Nano composite material of montmorillonite is directed to that organosilicon performed polymer first is inserted into montmorillonite
Interlayer, then introduce inorganic titanium elements into organosilicon performed polymer, prepare silicon titanium polymer/Nano composite material of montmorillonite.Silicon
Titanium polymer/Nano composite material of montmorillonite is dispersed in Grouting Cement, after Grouting Cement is hardened, and silicon titanium polymer/
In Nano composite material of montmorillonite, because the planar orientation of the good combination and clay lamella of silicon titanium polymer and clay lamella is made
With silicon titanium polymer/Nano composite material of montmorillonite has good dimensional stability and gas barrier, improves Grouting Cement
Gas barrier and water resistance after hardening, it is to avoid extraneous gas and moisture are pre- through touching after the Grouting Cement of hardening
Stress rib, it is to avoid presstressed reinforcing steel corrosion.Meanwhile, silicon titanium polymer/Nano composite material of montmorillonite is added in Grouting Cement, energy
Enough significantly improve the structural strength after Grouting Cement hardening.
Organosilicon is added in Grouting Cement, organosilicon is organo-silicon compound, refer to containing Si-C keys and at least one
Organic group is the compound being directly connected with silicon atom.Organosilicon has low surface tension and low-surface-energy, possesses excellent dredge
Aqueous energy.Organosilicon is added to after Grouting Cement, can improve the water resistance after Grouting Cement hardening, meanwhile, organosilicon and silicon
After titanium polymer/Nano composite material of montmorillonite mixing, the water resistance after Grouting Cement hardening can be further enhanced, it is to avoid
Presstressed reinforcing steel corrosion in Grouting Cement.
The further setting of the present invention is：Step 1, duct is molded, after framework of steel reinforcement welding fabrication, solid on framework of steel reinforcement
Determine bellows, grout hole and steam vent are installed.
By using above-mentioned technical proposal, grout hole and steam vent are set in the shaping of duct, steam vent can also be used as bleeding
Hole.
The further setting of the present invention is：Step 4, tension of prestressed tendon is anchored, and installs anchorage, grading tension, prestressing force
Muscle two ends are successively anchored, and the process of stretch-draw anchor is followed successively by 0,10% σ con, 105% σ con, holds lotus 2min, σ con, are anchored.
By using above-mentioned technical proposal, σ con refer to deformed bar control stress for prestressing.During stretch-draw anchor, first
σ con of the tensioning to 10%, then tensioning is to 105% σ con, keeps 2min, then tensioning is to σ con, anchoring.
The further setting of the present invention is：Step 4, tension of prestressed tendon is anchored, and installs anchorage, grading tension, prestressing force
Muscle two ends are successively anchored, and the process of stretch-draw anchor is followed successively by 0,10% σ con, 103% σ con, are anchored.
By using above-mentioned technical proposal, during stretch-draw anchor, pretensioning to 10% σ con, then tensioning is to 103% σ con, anchor
Gu.
The further setting of the present invention is：Step 5, duct grouting and sealing off and covering anchorage, prepare includes in Grouting Cement, Grouting Cement
Portland cement, organosilicon, silicon titanium polymer/montmorillonite composite material, the ratio of mud of wherein Grouting Cement are not more than 0.4, use
Grouting pump pours into Grouting Cement out of grout hole, and steam vent is detected one by one from the near to the remote from grout hole, after underflow is gone out one by one
Closing；After last steam vent goes out underflow, closed grate hole continues pressurize 0.4-0.6MPa, pressurize 2min, closure grouting
Hole；Grouting finishes rear sealing off and covering anchorage.
By using above-mentioned technical proposal, Grouting Cement enters from grout hole, when underflow is out of exhaust outlet discharge, duct
Air is discharged from steam vent.
The further setting of the present invention is：By weight, in each component in the Grouting Cement, portland cement 100
Part；2-8 parts of organosilicon；Silicon titanium polymer/5-10 parts of montmorillonite composite material.
By using above-mentioned technical proposal, portland cement, organosilicon, silicon titanium polymer/montmorillonite composite material mixing
Afterwards, Grouting Cement is formed.
The further setting of the present invention is：By weight, 1-5 parts of lignosulfonates are also included in the Grouting Cement.
By using above-mentioned technical proposal, lignosulfonates are a kind of water reducers, after being added in Grouting Cement, are improved
The mobility of Grouting Cement, after being mixed with silicon titanium polymer/montmorillonite composite material, the intensity after enhancing Grouting Cement hardening.
The further setting of the present invention is：Diameter big 5-15mm of the diameter in the duct than presstressed reinforcing steel.
By using above-mentioned technical proposal, channel diameter 5-15mm bigger than presstressed reinforcing steel diameter.
In summary, the invention has the advantages that：First, duct shaping after-pouring concrete, concrete component
Presstressed reinforcing steel is penetrated during maintenance, the duration is not accounted for；Secondly, after tension of prestressed tendon anchoring, then sealing off and covering anchorage, having reached prevents prestressing force
Muscle corrosion, saving construction material, reduce the effect of the amount of labour used.
Embodiment
Specific embodiment is only explanation of the invention, and it is not limitation of the present invention, those skilled in the art
The modification without creative contribution can be made to the present embodiment as needed after this specification is read, but as long as in this hair
All protected in bright right by Patent Law.
Embodiment 1：Post stretching bonded prestress construction, comprises the following steps, step 1, duct shaping, reinforcing bar
After frame welding fabrication, bellows is fixed on framework of steel reinforcement, bellows selects metal bellows.And grout hole is installed on duct
And steam vent.Step 2, concreting, casting concrete prepares concrete component.Step 3, presstressed reinforcing steel lashing, in coagulation
Presstressed reinforcing steel, the diameter big 5-15mm of the diameter than presstressed reinforcing steel in duct are penetrated during native component conservation.
Step 4, tension of prestressed tendon is anchored, and installs anchorage, and grading tension, presstressed reinforcing steel two ends are successively anchored.During tensioning
Presstressed reinforcing steel elongation is measured, measuring method can extend or measure exposed presstressed reinforcing steel length change using jack cylinder body.
Step 5, duct grouting and sealing off and covering anchorage, preparing includes portland cement, organosilicon, silicon in Grouting Cement, Grouting Cement
Titanium polymer/montmorillonite composite material.By weight, 100 parts of portland cement, 5 parts of organosilicon, silicon titanium polymer/montmorillonite
10 parts of nano composite material, portland cement, organosilicon, silicon titanium polymer/Nano composite material of montmorillonite are weighed by formula ratio
After mixing, the ratio of mud that addition water is stirred into Grouting Cement, Grouting Cement is not more than 0.4.
Silicon titanium polymer/Nano composite material of montmorillonite preparation method is as follows, weighs 35.6g MTESs,
It is added in twoport flask, the hydrochloric acid that 10g mass fractions are 5% is added dropwise into flask, is placed in 5 DEG C of stirred in water bath, reaction
About 4 hours, organic siliconresin was separated out.The water in flask is sucked with filter paper, organic siliconresin is left.5ml second is added into flask
Alcohol solution, stir about half an hour.The OMMT (nano imvite) that mass fraction is 6% is added into flask again, one section is stirred
After time, then it is 2 to add 6g molar ratios thereto：1 ethyl acetoacetate and the mixed liquor of butyl titanate, stir about half
After hour, pour into vessel, freeze-day with constant temperature about 36d at 30 DEG C, when, obtain silicon titanium polymer/Nano composite material of montmorillonite.
Grouting Cement is poured into out of grout hole with grouting pump, steam vent is detected one by one from the near to the remote from grout hole, treats out
Closed one by one after underflow；After last steam vent goes out underflow, closed grate hole.Continue pressurize 0.4-0.6MPa, pressurize
2min, closure grouting hole.Grouting finishes rear sealing off and covering anchorage.
Presstressed reinforcing steel corrosion test：Column test specimen is poured with presstressed reinforcing steel and Grouting Cement, presstressed reinforcing steel length of embedment is
500mm.For the corrosion state after simulating normal configuration in a short time for many years, using Accelerated corrosion test method, pouring
Cheng Zhong, 2% sodium chloride of doped silicate water quality in Grouting Cement.Presstressed reinforcing steel is horizontally disposed and one end is located at
Outside test specimen.
After column test specimen is poured, test specimen is put in ground, a small cofferdam is done in test specimen upper surface with cement mortar, note in it
Enter the sodium chloride solution of mass concentration 3%.Stainless-steel sheet is put into sodium chloride solution, presstressed reinforcing steel is located at outside test specimen
One end is communicated in the positive pole of dc source, and stainless steel plate is connected to the negative pole of dc source, passes to permanently strong degree direct current electric forming electricity
Xie Chi.200 hours conduction time, current strength 0.3-0.4.
Test specimen breaks type after corrosion test, by test specimen and takes out presstressed reinforcing steel, and the weight loss of presstressed reinforcing steel is weighed after derusting
Rate, prestressed rate of weight loss for (experiment before presstressed reinforcing steel weight-experiment after presstressed reinforcing steel weight)/experiment before in advance should
The weight of power muscle, lists result of the test in the following table 1.
Grouting Cement strength test, according to GB175-2007《Common portland cement》Regulation, using GB/T17671-
1999《Test method for strength of hydraulic cement mortar (ISO methods)》Defined method, is tested according to the method for testing of Portland cement
The strength grade of Grouting Cement, and test result is listed in the following table 1.
Embodiment 2：Bonded prestress construction is sent out in posttension, is with the difference of embodiment 1, step 4, in advance should
Power muscle stretch-draw anchor, installs anchorage, and grading tension, presstressed reinforcing steel two ends are successively anchored, and the process of stretch-draw anchor is followed successively by 0,
10% σ con, 105% σ con, holds lotus 2min, σ con, anchoring.
Embodiment 3：Post stretching bonded prestress construction, is with the difference of embodiment 1, step 4, in advance should
Power muscle stretch-draw anchor, installs anchorage, and grading tension, presstressed reinforcing steel two ends are successively anchored, and the process of stretch-draw anchor is followed successively by 0,
10% σ con, 103% σ con, anchoring.
Embodiment 4：Post stretching bonded prestress construction, is, Grouting Cement with the difference of embodiment 1
In, by weight, 2 parts of organosilicon, silicon titanium polymer/5 parts of montmorillonite composite material.
Embodiment 5：Post stretching bonded prestress construction, is, Grouting Cement with the difference of embodiment 1
In, by weight, 8 parts of organosilicon, silicon titanium polymer/5 parts of montmorillonite composite material.
Embodiment 6：Post stretching bonded prestress construction, is, Grouting Cement with the difference of embodiment 1
In, by weight, 1 part of lignosulfonates are also included in Grouting Cement.
Embodiment 7：Post stretching bonded prestress construction, is, Grouting Cement with the difference of embodiment 1
In, by weight, 5 parts of lignosulfonates are also included in Grouting Cement.
Comparative example 1：Post stretching bonded prestress construction, is, Grouting Cement is with the difference of embodiment 1
Portland cement.
Comparative example 2：Bonded prestress construction is sent out in posttension, is with the difference of embodiment 1, in Grouting Cement
Silicon titanium polymer/montmorillonite composite material is not contained.
Comparative example 3：Bonded prestress construction is sent out in posttension, is with the difference of embodiment 1, in Grouting Cement
Organosilicon is not contained.
Comparative example 4：Bonded prestress construction is sent out in posttension, is with the difference of embodiment 5, in Grouting Cement
Silicon titanium polymer/montmorillonite composite material is not contained.
Comparative example 5：Bonded prestress construction is sent out in posttension, is with the difference of embodiment 5, in Grouting Cement
Organosilicon is not contained.
Table 1
| Presstressed reinforcing steel rate of weight loss (%) | Grouting Cement intensity | |
| Embodiment 1 | 6.2 | 52.5 |
| Embodiment 2 | 6.4 | 52.5 |
| Embodiment 3 | 5.9 | 52.5 |
| Embodiment 4 | 6.6 | 52.5 |
| Embodiment 5 | 6.5 | 52.5 |
| Embodiment 6 | 4.8 | 52.5 |
| Embodiment 7 | 4.5 | 52.5 |
| Comparative example 1 | 13.3 | 42.5 |
| Comparative example 2 | 12.6 | 42.5 |
| Comparative example 3 | 9.8 | 42.5R |
| Comparative example 4 | 11.9 | 42.5 |
| Comparative example 5 | 9.3 | 42.5R |
Claims (8)
1. a kind of post stretching bonded prestress construction, it is characterised in that：Comprise the following steps, step 1, duct shaping,
After framework of steel reinforcement welding fabrication, bellows is fixed on framework of steel reinforcement；Step 2, concreting, casting concrete is prepared mixed
Solidifying soil component；Step 3, presstressed reinforcing steel lashing, penetrates presstressed reinforcing steel during apparatus for concrete member curing；Step 4, presstressed reinforcing steel
Anchoring is drawn, anchorage is installed, grading tension, presstressed reinforcing steel two ends are successively anchored；Step 5, duct grouting and sealing off and covering anchorage, prepare grouting water
Include portland cement, organosilicon, the water of silicon titanium polymer/montmorillonite composite material, wherein Grouting Cement in mud, Grouting Cement
Gray scale is not more than 0.4, and with Grouting Cement to the duct grouting in concrete component, grouting finishes rear sealing off and covering anchorage.
2. post stretching bonded prestress construction according to claim 1, it is characterised in that：Step 1, duct into
After type, framework of steel reinforcement welding fabrication, bellows is fixed on framework of steel reinforcement, grout hole and steam vent are set.
3. post stretching bonded prestress construction according to claim 1, it is characterised in that：Step 4, presstressed reinforcing steel
Stretch-draw anchor, installs anchorage, and grading tension, presstressed reinforcing steel two ends are successively anchored, and the process of stretch-draw anchor is followed successively by 0,10% σ
Con, 105% σ con, hold lotus 2min, σ con, anchoring.
4. post stretching bonded prestress construction according to claim 1, it is characterised in that：Step 4, presstressed reinforcing steel
Stretch-draw anchor, installs anchorage, and grading tension, presstressed reinforcing steel two ends are successively anchored, and the process of stretch-draw anchor is followed successively by 0,10% σ
Con, 103% σ con, anchoring.
5. post stretching bonded prestress construction according to claim 1, it is characterised in that：Step 5, duct grouting
And sealing off and covering anchorage, preparing includes portland cement, organosilicon, silicon titanium polymer/montmorillonite Composite material in Grouting Cement, Grouting Cement
Material, the ratio of mud of wherein Grouting Cement is not more than 0.4, is poured into out of grout hole Grouting Cement with grouting pump, from grout hole by
Closely to far steam vent is detected one by one, closed one by one after underflow is gone out；After last steam vent goes out underflow, closed grate hole,
Continue pressurize 0.4-0.6MPa, pressurize 2min, closure grouting hole；Grouting finishes rear sealing off and covering anchorage.
6. post stretching bonded prestress construction according to claim 1, it is characterised in that：By weight, it is described
In each component in Grouting Cement, 100 parts of portland cement；2-8 parts of organosilicon；Silicon titanium polymer/montmorillonite composite material 5-
10 parts.
7. post stretching bonded prestress construction according to claim 6, it is characterised in that：By weight, it is described
Also include 1-5 parts of lignosulfonates in Grouting Cement.
8. post stretching bonded prestress construction according to claim 1, it is characterised in that：The diameter in the duct
Than the big 5-15mm of diameter of presstressed reinforcing steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710199062.3A CN107023170A (en) | 2017-03-29 | 2017-03-29 | Post stretching bonded prestress construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710199062.3A CN107023170A (en) | 2017-03-29 | 2017-03-29 | Post stretching bonded prestress construction |
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| Publication Number | Publication Date |
|---|---|
| CN107023170A true CN107023170A (en) | 2017-08-08 |
Family
ID=59525865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201710199062.3A Pending CN107023170A (en) | 2017-03-29 | 2017-03-29 | Post stretching bonded prestress construction |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107700850A (en) * | 2017-10-09 | 2018-02-16 | 浙江宏超建设集团有限公司 | Post stretching bonded prestress engineering construction process |
| CN108947421A (en) * | 2018-08-01 | 2018-12-07 | 浙江省通用砂浆研究院 | A kind of assembled architecture impervious sleeve grouting material and preparation method thereof |
| CN110607841A (en) * | 2019-10-18 | 2019-12-24 | 中国建筑第八工程局有限公司 | Wind tunnel prestress construction process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107700850A (en) * | 2017-10-09 | 2018-02-16 | 浙江宏超建设集团有限公司 | Post stretching bonded prestress engineering construction process |
| CN108947421A (en) * | 2018-08-01 | 2018-12-07 | 浙江省通用砂浆研究院 | A kind of assembled architecture impervious sleeve grouting material and preparation method thereof |
| CN108947421B (en) * | 2018-08-01 | 2021-03-19 | 浙江省通用砂浆研究院 | Impermeable sleeve grouting material for fabricated building and preparation method thereof |
| CN110607841A (en) * | 2019-10-18 | 2019-12-24 | 中国建筑第八工程局有限公司 | Wind tunnel prestress construction process |
| CN110607841B (en) * | 2019-10-18 | 2021-10-15 | 中国建筑第八工程局有限公司 | Wind tunnel prestress construction process |
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