CN107700850A - Post stretching bonded prestress engineering construction process - Google Patents
Post stretching bonded prestress engineering construction process Download PDFInfo
- Publication number
- CN107700850A CN107700850A CN201710930369.6A CN201710930369A CN107700850A CN 107700850 A CN107700850 A CN 107700850A CN 201710930369 A CN201710930369 A CN 201710930369A CN 107700850 A CN107700850 A CN 107700850A
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- China
- Prior art keywords
- reinforcing steel
- presstressed reinforcing
- engineering construction
- construction process
- post stretching
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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
- E04G21/121—Construction of stressing jacks
-
- 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
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
The invention discloses a kind of post stretching bonded prestress engineering construction process, solves the problems, such as to easily cause presstressed reinforcing steel corrosion in post stretching bonded prestress engineering construction process, its drip irrigation device is to comprise the following steps：Beam is compiled in presstressed reinforcing steel blanking；Presstressed reinforcing steel duct is molded, and is welded cableway in advance, welding end portion anchor plate, after framework of steel reinforcement shaping, helix tube is fixed on framework of steel reinforcement, rubber belt sealing all should be used in its joint and with the contact position of anchor plate；Presstressed reinforcing steel lashing, after casting concrete, presstressed reinforcing steel is penetrated within curing period；Prestressed stretch-draw anchor, the both ends of simultaneous tension presstressed reinforcing steel, and the both ends of priority anchoring prestress muscle；Duct grouting and sealing off and covering anchorage, tension of prestressed tendon anchoring after in time cement grouting and carry out anchorage closure work.The post stretching bonded prestress engineering construction process of the present invention, in the case of low cost, effectively prevents presstressed reinforcing steel corrosion.
Description
Technical field
Design building construction of the present invention, more particularly to a kind of post stretching bonded prestress engineering construction process.
Background technology
Post stretching refers to first casting concrete, and the position corresponding duct of outflow of presstressed reinforcing steel is pressed in component body, treats
After the concrete strength of component reaches defined thickness, presstressed reinforcing steel is penetrated in reserving hole channel and carries out tensioning, and utilizes anchorage
Presstressed reinforcing steel after tensioning is anchored on the end of component, passed the prestressing force of presstressed reinforcing steel by the anchorage of component ends
Concrete is passed, it is produced compressive pre-stress.Prestressed reinforced concrete construction, it is before structure bearing load, it is applied in advance
Plus-pressure, its concrete in tension zone internal force in outer load action is set to produce compression, to offset or reduce external load production
Raw tension, makes that structure does not produce crack in the condition of normal use or split must be than later；Filled again in reserving hole channel
Enter cement mortar, presstressed reinforcing steel is formed entirety with concrete component.
Post stretching bonded prestressed concrete technology be by pre-buried pipeline, to wear the processes such as muscle, tensioning, grouting be coagulation
Soil structure establishes prestressing force to meet design requirement.After tension of prestressed tendon, cement mortar is suppressed into prestressed pore passage, made
Obtain presstressed reinforcing steel effectively to bond with concrete members, the spacing and width in crack when overloading with control, and mitigate both ends anchorage
Load condition, while allow presstressed reinforcing steel from corrosion.
In existing post stretching bonded prestress construction process, although duct grouting can make presstressed reinforcing steel and coagulation
Native component forms entirety, but in practical operation, hole, extraneous moisture and air after cement slurry sets inevitably be present
Contacted easily by these holes with presstressed reinforcing steel, oxidation reaction occurs and in turn results in presstressed reinforcing steel corrosion.For preventing pre- answer
The post stretching bonded prestress construction of power muscle corrosion, have operation through the following steps that：Step 1, duct is molded, reinforcing bar
After skeleton welding fabrication, bellows is fixed on framework of steel reinforcement；Step 2, concreting, casting concrete, concrete is prepared
Component；Step 3, presstressed reinforcing steel lashing, presstressed reinforcing steel is penetrated during apparatus for concrete member curing；Step 4, tension of prestressed tendon anchor
Gu installing anchorage, grading tension, presstressed reinforcing steel both ends successively anchor；Step 5, duct grouting and sealing off and covering anchorage, Grouting Cement is prepared,
Include the water ash of portland cement, organosilicon, silicon titanium polymer/montmorillonite composite material, wherein Grouting Cement in Grouting Cement
Than no more than 0.4, with Grouting Cement to the duct grouting in concrete component, sealing off and covering anchorage after grouting.Above is pass through change
The performance of cement, so realize the cement solidifies after do not produce hole, prevented the air in the external world and connecing for moisture and presstressed reinforcing steel
Touch, avoid presstressed reinforcing steel that corrosion occurs.But the production cost of the cement is higher, along with post stretching mode cost itself just
Height, it is unfavorable for popularizing, therefore, the present inventor is expected in the case where not producing high cost, can be by improving work of constructing
Skill avoids presstressed reinforcing steel corrosion.
The content of the invention
In view of the deficienciess of the prior art, it is an object of the invention to provide a kind of post-tensioning for preventing presstressed reinforcing steel corrosion
Method bonded prestress engineering construction process.
To achieve the above object, the invention provides following technical scheme：A kind of post stretching bonded prestress engineering is applied
Work technique, comprises the following steps：
Step 1, beam is compiled in presstressed reinforcing steel blanking, bunchy colligation by number, is tied up silk head and is detained in beam per 2m with steel wire lashing together；
Step 2, presstressed reinforcing steel duct is molded, and welds cableway, welding end portion anchor plate, after framework of steel reinforcement shaping, in reinforcing bar in advance
Helix tube is fixed on skeleton, rubber belt sealing all should be used in its joint and with the contact position of anchor plate；
Step 3, presstressed reinforcing steel lashing, after casting concrete, presstressed reinforcing steel is penetrated within curing period；
Step 4, prestressed stretch-draw anchor, the both ends of simultaneous tension presstressed reinforcing steel, and the both ends of priority anchoring prestress muscle；
Step 5, duct grouting and sealing off and covering anchorage, tension of prestressed tendon anchoring after in time cement grouting and carry out anchorage closure work, fill
Slurry order answers first lower floor, rear upper strata, and every component is continuously in the milk, and each duct one-time continuous is filled, from grout hole from the near to the remote
Grout outlet is checked one by one, is closed one by one after underflow is gone out, after last slurry outlet goes out underflow, closes slurry outlet, continues to add
Pressure（0.4~0.6MPa）, pressurize 2 minutes, close slurry-feeding hole.
Work experience this five processes are blocked by expecting that presstressed reinforcing steel duct is in the milk and carries out anchorage under presstressed reinforcing steel,
The joint of framework of steel reinforcement and helix tube and outside air and moisture all should be isolated using rubber belt sealing with the contact position of anchor plate,
Prevent outside air and moisture from being contacted with presstressed reinforcing steel and oxidation reaction occurs.
The present invention is further arranged to：Step 1, during blanking first under long presstressed reinforcing steel, short presstressed reinforcing steel under rear.
Long presstressed reinforcing steel is below, and short presstressed reinforcing steel can allow presstressed reinforcing steel to be put neatly, maximize profit above
With space, the gap between presstressed reinforcing steel is reduced.
The present invention is further arranged to：Step 2, grout hole and steam vent, the grout hole and row are installed on the coil
Stomata connects with presstressed reinforcing steel duct.
, could be by water when presstressed reinforcing steel duct is in the milk, it is necessary to which grout hole and steam vent connect with presstressed reinforcing steel duct
Air inside mud discharges, and prevents hole occur in the cement mortar after solidification, and then prevent outside air and moisture
Into serving the effect for preventing presstressed reinforcing steel corrosion.
The present invention is further arranged to：Step 4, stretching mode takes grading tension or Multi-stage prestress or by stages tensioning or benefit
Repay tensioning.
Stretching mode can take above stretching mode any one, both ends of simultaneous tension presstressed reinforcing steel, and priority anchor
Gu the both ends of presstressed reinforcing steel.
The present invention is further arranged to：Step 5, the ratio of mud of grouting cement mortar is less than or equal to 0.4,3h bleedings after stirring
Rate is less than or equal to 3%.
The ratio of mud refers to the dosage of concrete reclaimed water and the weight ratio of cement consumption, and the ratio of mud influences the rheology of concrete
Compactness after performance, cement mortar coherent structure and its hardening, thus in the case where composition material is given, the ratio of mud is to determine
Determine the major parameter of concrete strength, durability and other a series of physical mechanical properties, bleeding rate is bleeding quantity to concrete
The ratio between mixture water content, by ratio of mud control 0.4 and less, after stirring the control of 3h bleeding rates can guarantee that 3% and less
Pour into the performance of the cement mortar in duct.
The present invention is further arranged to：Step 4, the process of stretch-draw anchor is followed successively by 0 → 10% σcon→105%σcon（Hold lotus
2min）→σcon→ anchoring.
Control stress for prestressing refers to that deformed bar is carrying out controlling the maximum stress value reached during tensioning.Its value is
Draw equipment（Such as jack oil pressure gauge）Stress value obtained by indicated total stretching force divided by deformed bar area of section, with σ
Con is represented, the value of control stress for prestressing, directly affects the using effect of prestressed concrete.First opened during stretch-draw anchor
Move 10% σ toCon,, then tensioning is to 105% σcon , keep post-tensioning in 2 minutes to move σ tocon, finally anchor.
The present invention is further arranged to：Step 4, the process of stretch-draw anchor is followed successively by 0 → 10% σcon→103%σcon→ anchor
Gu.
Pretensioning is to 10% σ during stretch-draw anchorCon,, then tensioning is to 103% σcon , keep post-tensioning in 2 minutes to move σ tocon, most
After anchor.
Present invention tool has the advantage that：Under conditions of low cost, the corrosion of presstressed reinforcing steel can be effectively prevented.
Embodiment
Embodiment one：Post stretching bonded prestress engineering construction process, comprises the following steps：
1）Beam is compiled in presstressed reinforcing steel blanking, bunchy colligation by number, is tied up silk head and is detained in beam per 2m with steel wire lashing together, a branch of
It is not more than 50mm between interior each muscle；During presstressed reinforcing steel length≤6m of the equal heading in both ends, cutting length error between each muscle
No more than 2mm；When muscle length is more than 6m, error is not more thanL/ 5000 and it is not more than 5mm；During blanking first under long presstressed reinforcing steel, after
Under short presstressed reinforcing steel, long presstressed reinforcing steel is below, and short presstressed reinforcing steel is placed on above long presstressed reinforcing steel；
2）Presstressed reinforcing steel duct is molded, and welds cableway, welding end portion anchor plate, after framework of steel reinforcement shaping, in framework of steel reinforcement in advance
Upper fixed helix tube, rubber belt sealing, when being molded with helix tube, duct all should be used in its joint and with the contact position of anchor plate
Diameter compares presstressed reinforcing steel（Beam）Big 5~the 15mm of diameter, grout hole is installed on the coil and steam vent, grout hole and steam vent are equal
Connected with presstressed reinforcing steel duct.；
3）Presstressed reinforcing steel lashing, after casting concrete, presstressed reinforcing steel is penetrated within curing period；
4）Prestressed stretch-draw anchor, the both ends of simultaneous tension presstressed reinforcing steel, and the both ends of priority anchoring prestress muscle, stretching mode
Take grading tension or Multi-stage prestress or by stages tensioning or compensation tensioning, stretching mode that above stretching mode can be taken any one
Kind, the both ends of simultaneous tension presstressed reinforcing steel, and the both ends of priority anchoring prestress muscle；
5）Duct grouting and sealing off and covering anchorage, tension of prestressed tendon anchoring after in time cement grouting and carry out anchorage closure work, grouting use
The ratio of mud of cement mortar is less than or equal to 0.4, and 3h bleeding rates are less than or equal to 3% after stirring, and grouting order answers first lower floor, rear upper strata, often
Root component is continuously in the milk, and each duct one-time continuous is filled, and grout outlet is checked one by one from the near to the remote from grout hole, after underflow is gone out
Close one by one, after last slurry outlet goes out underflow, close slurry outlet, continue to pressurize（0.4~0.6MPa）, pressurize 2 minutes,
Close slurry-feeding hole.
Embodiment two, the place different from embodiment one be, pretensioning is to 10% σ during stretch-draw anchorCon,, then open
Move 105% σ tocon , keep post-tensioning in 2 minutes to move σ tocon, finally anchor.
Embodiment three, the place different from embodiment one be, pretensioning is to 10% σ during stretch-draw anchorCon,, then open
Move 103% σ tocon , keep post-tensioning in 2 minutes to move σ tocon, finally anchor.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (7)
- A kind of 1. post stretching bonded prestress engineering construction process, it is characterised in that：Comprise the following steps：Step 1, beam is compiled in presstressed reinforcing steel blanking, bunchy colligation by number, is tied up silk head and is detained in beam per 2m with steel wire lashing together；Step 2, presstressed reinforcing steel duct is molded, and welds cableway, welding end portion anchor plate, after framework of steel reinforcement shaping, in reinforcing bar in advance Helix tube is fixed on skeleton, rubber belt sealing all should be used in its joint and with the contact position of anchor plate；Step 3, presstressed reinforcing steel lashing, after casting concrete, presstressed reinforcing steel is penetrated within curing period；Step 4, prestressed stretch-draw anchor, the both ends of simultaneous tension presstressed reinforcing steel, and the both ends of priority anchoring prestress muscle；Step 5, duct grouting and sealing off and covering anchorage, tension of prestressed tendon anchoring after in time cement grouting and carry out anchorage closure work, fill Slurry order answers first lower floor, rear upper strata, and every component is continuously in the milk, and each duct one-time continuous is filled, from grout hole from the near to the remote Grout outlet is checked one by one, is closed one by one after underflow is gone out, after last slurry outlet goes out underflow, closes slurry outlet, continues to add Pressure（0.4~0.6MPa）, pressurize 2 minutes, close slurry-feeding hole.
- 2. post stretching bonded prestress engineering construction process according to claim 1, it is characterised in that：Step 1, blanking When first under long presstressed reinforcing steel, short presstressed reinforcing steel under rear.
- 3. post stretching bonded prestress engineering construction process according to claim 1, it is characterised in that：Step 2, in spiral shell Grout hole is installed on coil and steam vent, the grout hole and steam vent connect with presstressed reinforcing steel duct.
- 4. post stretching bonded prestress engineering construction process according to claim 1, it is characterised in that：Step 4, tensioning Mode takes grading tension or Multi-stage prestress or by stages tensioning or compensation tensioning.
- 5. post stretching bonded prestress engineering construction process according to claim 1, it is characterised in that：Step 5, it is in the milk It is less than or equal to 0.4 with the ratio of mud of cement mortar, 3h bleeding rates are less than or equal to 3% after stirring.
- 6. the post stretching bonded prestress engineering construction process according to claim 1 or 4, it is characterised in that：Step 4, The process of stretch-draw anchor is followed successively by 0 → 10% σcon→105%σcon（Hold lotus 2min）→σcon→ anchoring.
- 7. the post stretching bonded prestress engineering construction process according to claim 1 or 4, it is characterised in that：Step 4, The process of stretch-draw anchor is followed successively by 0 → 10% σcon→103%σcon→ anchoring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710930369.6A CN107700850A (en) | 2017-10-09 | 2017-10-09 | Post stretching bonded prestress engineering construction process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710930369.6A CN107700850A (en) | 2017-10-09 | 2017-10-09 | Post stretching bonded prestress engineering construction process |
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| Publication Number | Publication Date |
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| CN107700850A true CN107700850A (en) | 2018-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710930369.6A Pending CN107700850A (en) | 2017-10-09 | 2017-10-09 | Post stretching bonded prestress engineering construction process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110258928A (en) * | 2019-06-26 | 2019-09-20 | 中国长江三峡集团有限公司 | A kind of installation method of Nut column deformed bar device |
| CN110863421A (en) * | 2019-12-05 | 2020-03-06 | 四川石油天然气建设工程有限责任公司 | Large oil-gas pipeline crossing anchorage prestress system integrated protection system and process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1443723A (en) * | 2003-04-14 | 2003-09-24 | 上海建科预应力技术工程有限公司 | Grouting material and vacuum grouting process in prestressed concrete engineering |
| 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 |
| KR101688773B1 (en) * | 2016-06-03 | 2016-12-22 | 박용필 | Reversible pretress introduction device and reinforcement and reconstruction method of structure using the same |
| CN107023170A (en) * | 2017-03-29 | 2017-08-08 | 浙江环宏市政建设有限公司 | Post stretching bonded prestress construction |
-
2017
- 2017-10-09 CN CN201710930369.6A patent/CN107700850A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1443723A (en) * | 2003-04-14 | 2003-09-24 | 上海建科预应力技术工程有限公司 | Grouting material and vacuum grouting process in prestressed concrete engineering |
| 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 |
| KR101688773B1 (en) * | 2016-06-03 | 2016-12-22 | 박용필 | Reversible pretress introduction device and reinforcement and reconstruction method of structure using the same |
| CN107023170A (en) * | 2017-03-29 | 2017-08-08 | 浙江环宏市政建设有限公司 | Post stretching bonded prestress construction |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110258928A (en) * | 2019-06-26 | 2019-09-20 | 中国长江三峡集团有限公司 | A kind of installation method of Nut column deformed bar device |
| CN110863421A (en) * | 2019-12-05 | 2020-03-06 | 四川石油天然气建设工程有限责任公司 | Large oil-gas pipeline crossing anchorage prestress system integrated protection system and process |
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Application publication date: 20180216 |
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