CN101798875B - Construction method for stretching and drawing high-span crossbeam with bonding prestress at single side - Google Patents
Construction method for stretching and drawing high-span crossbeam with bonding prestress at single side Download PDFInfo
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- CN101798875B CN101798875B CN201010130234XA CN201010130234A CN101798875B CN 101798875 B CN101798875 B CN 101798875B CN 201010130234X A CN201010130234X A CN 201010130234XA CN 201010130234 A CN201010130234 A CN 201010130234A CN 101798875 B CN101798875 B CN 101798875B
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Abstract
The invention discloses a construction method for stretching and drawing a high-span crossbeam with bonding prestress at a single side. The method comprises the following steps of: twisting off a steel strand, manufacturing a squeezing anchor, laying ribs with bonding prestress, pouring concrete, stretching and drawing, grouting pore paths, and the like. The invention has simple and convenient construction and easy control of construction quality and guarantees the construction quality.
Description
Technical field:
The present invention relates to a kind of construction techniques.
Background technology:
Existing construction method for stretching and drawing high-span crossbeam with bonding prestress complexity, the quality control difficulty influences construction quality.
Summary of the invention:
The object of the present invention is to provide the easily stretching and drawing high-span crossbeam with bonding prestress at single side job practices of control of a kind of easy construction, construction quality.
Technical solution of the present invention is:
A kind of stretching and drawing high-span crossbeam with bonding prestress at single side job practices is characterized in that: comprise the following steps:
(1) the steel strand strand is disconnected:
On the place of smooth drying directly with Abrasive cutting off machine by the root fracture, identical to the steel strand length of using in the same beam hole road, the steel strand of difference bundle, different length specification are carried out classifying and numbering by the prestressing force beam number;
(2) the extruding anchor is made:
Make the fixed end Extrusion anchor ground tackle with extruder, oil meter pressure should be between 3～60MPa during extruding;
(3) lay of bonding prestress muscle is arranged:
Lay base plate, the tied framework reinforcing bar: behind single main muscle and the stirrup, carry out the making of presstressed reinforcing steel about first colligation is finished, the framework crossbeam should be reserved a side side form at least, seals side form again after the bellows laying finishes, so that prestressed girder is worn the muscle construction;
Determine the duct height, electric welding support reinforcing bar: during construction, at first on the stirrup that colligation is finished, determine support reinforcing bar height, support reinforcing bar height should be working drawing soffit to cable wire distance between center line and deducts corresponding bellows radius, the support reinforcing bar adopts Φ 10 above reinforcing bars, level interval 1000mm, and width is identical with the beam stirrup width; Determine earlier position, minimum point place, duct, then along minimum point to both sides by the requirement of level interval the electric welding of support reinforcing bar on stirrup;
Lay bellows: after finishing the support reinforcement installation, get final product the lay metal bellows; The corrugated pipe connector place adopts the joint coupling than the big 5mm of instrumentation tubes diameter to connect; Before wearing bellows, should note checking presentation quality simultaneously, when disrepair phenomenon being arranged, should change pipeline as the discovery bellows; The corrugated pipe connector place must seal with tape;
Bellows is reserved steam vent, and the plastics fairlead in aperture is connected closely knit with the bellows joint, and the plastics fairlead exceeds more than the member end face 200mm, inserts bar dowel so that temporary fixed in the plastics fairlead;
The presstressed reinforcing steel lashing: steel strand adopt single lashing scheme, earlier the steel strand end is packed tightly with friction tape before the lashing, then single steel strand is worn to the other end from bellows one end, steel strand are finished extrusion head earlier and are made when marching into the arena, and steel strand can only be worn to the stretch-draw end from fixed end iron plate, during lashing, note piercing at need and can not resist stubbornly,, and steel strand back and forth gently should be taken out, push away, changeed in case bellows is by bursting, should check in case of necessity whether bellows is clear and coherent, otherwise it should be held up suitable; Fixed end extruding anchor must be close to iron plate; The fixed end ripple mouth of pipe is with steel wire lump and sponge sealing; Lashing is carried out before smashing concrete watering, and adopts following method to protect to exposing steel strand: seal the wrapping Polypropylence Sheet outside steel strand, twine plastic colloidal cloth outward, after lashing is finished bellows is checked, should in time handle if find phenomenon such as broken hole;
When laying the presstressed reinforcing steel construction, fixed support is set to guarantee the laying-out curve of presstressed reinforcing steel,, should at first guarantees the accurate of presstressed reinforcing steel position when presstressed reinforcing steel has when conflict with plain bars or other pipeline positions by the design drawing requirement;
The installation of end anchor backing plate: after the bellows fixed-site well and lashing finishes, anchor plate and spiral bar can be installed, end template should press the end anchor backing plate, should adopt reinforcing bar fix simultaneously, to prevent watering when smashing concrete phenomenons such as generation off normal; After the anchor plate installation, grout hole on the anchor plate is carried out close and protect, fixed end extruding anchor installation site is accurate;
(4) concreting: concrete answers layering to vibrate, and vibration compacting is in time made concrete test block, and stays the concrete test block of establishing with the condition maintenance by the job specfication requirement, to determine the stretch-draw time; Maintenance in time after the concreting is checked and cleaning duct, anchor plate and grout hole;
(5) stretch-draw: a branch of by stretch-draw end pretensioning to 103% by a jack; Again stretch-draw another restraint 103%;
Concrete strength can carry out stretch-draw after should reaching design or code requirement, and the concrete pressure testing report with the condition maintenance should be arranged before the formal stretch-draw;
The stretch-draw stressing sequence of presstressed reinforcing steel is: 0 → 0.2 σ con → 1.03 σ con;
The tension of prestressed tendon proof stress is σ con=0.70fptk;
Elongation value of stretching should measure, and do on-the-spot record at twice from 0.2 σ con → 1.03 σ con;
The tension of prestressed tendon stretch value calculates:
The elongation value of stretching of tension of prestressed tendon calculates by rigorous method, and treating provides after the steel strand modulus of elasticity is determined;
Actual stretch value with calculate the stretch value deviation should be within+6%～-6%, otherwise should suspend stretch-draw, ascertain the reason and continue stretch-draw Ex post; Ground tackle stretch-draw retraction value should be controlled at 5mm;
(6) duct grouting: be in the milk after tension of prestressed tendon finishes;
Be in the milk the previous day, application of pure cement paste envelope in end anchorage place is wrapped up in the space between anchor clipper, only reserves grout hole or venthole;
The portland cement of Grouting Cement using strength 52.5, water/binder ratio are 0.4, and degree of mobilization is 12～18cm, and Grouting Cement is mixed with machinery and stirred;
The duct is once filled in grouting equably from the grout hole that is arranged on curve duct peak, treat to emerge in ground tackle venthole place, two ends can seal venthole after the underflow, and continue to be pressurized to 0.6MPa rear enclosed grout hole; Should check the bleeding situation after the grouting and in time manually mend slurry; Should in time make the cement paste test block during grouting, the cement paste test block adopts 7.07cm * 7.07cm * 7.07cm cube die trial to make, and the compressive strength that mark is supported 28d is not less than 30Mpa;
After the grouting, expose steel strand and cut off, should keep 40～50mm, after the cutting, wrap up in the termination with the coagulation grave but expose steel strand with Abrasive cutting off machine or gas cutting.
The plastics fairlead in the steam vent aperture of reserving on the bellows and the syndeton of bellows joint, comprise the sponge pad that covers on the bellows steam vent aperture, the plastics arc pressuring plate of cover tape protruded tube on the sponge pad, the plastics fairlead is sleeved on the protruded tube of plastics arc pressuring plate, and fixes by the protruded tube colligation of galvanized wire and plastics arc pressuring plate.
Easy construction of the present invention, construction quality are easily controlled, and have guaranteed construction quality.
Description of drawings:
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the johning knot composition of plastics fairlead and bellows joint in the embodiment of the invention.
The specific embodiment:
A kind of stretching and drawing high-span crossbeam with bonding prestress at single side job practices comprises the following steps:
(1) the steel strand strand is disconnected:
On the place of smooth drying directly with Abrasive cutting off machine by the root fracture, identical to the steel strand length of using in the same beam hole road, the steel strand of difference bundle, different length specification are carried out classifying and numbering by the prestressing force beam number;
(2) the extruding anchor is made:
Make the fixed end Extrusion anchor ground tackle with extruder, oil meter pressure should be between 3～60MPa during extruding;
(3) lay of bonding prestress muscle is arranged:
Lay base plate, the tied framework reinforcing bar: behind single main muscle and the stirrup, carry out the making of presstressed reinforcing steel about first colligation is finished, the framework crossbeam should be reserved a side side form at least, seals side form again after the bellows laying finishes, so that prestressed girder is worn the muscle construction;
Determine the duct height, electric welding support reinforcing bar: during construction, at first on the stirrup that colligation is finished, determine support reinforcing bar height, support reinforcing bar height should be working drawing soffit to cable wire distance between center line and deducts corresponding bellows radius, the support reinforcing bar adopts Φ 10 above reinforcing bars, level interval 1000mm, and width is identical with the beam stirrup width; Determine earlier position, minimum point place, duct, then along minimum point to both sides by the requirement of level interval the electric welding of support reinforcing bar on stirrup;
Lay bellows: after finishing the support reinforcement installation, get final product the lay metal bellows; The corrugated pipe connector place adopts the joint coupling than the big 5mm of instrumentation tubes diameter to connect; Before wearing bellows, should note checking presentation quality simultaneously, when disrepair phenomenon being arranged, should change pipeline as the discovery bellows; The corrugated pipe connector place must seal with tape;
Bellows is reserved steam vent, and the plastics fairlead in aperture is connected closely knit with the bellows joint, and the plastics fairlead exceeds more than the member end face 200mm, inserts bar dowel so that temporary fixed in the plastics fairlead;
The presstressed reinforcing steel lashing: steel strand adopt single lashing scheme, earlier the steel strand end is packed tightly with friction tape before the lashing, then single steel strand is worn to the other end from bellows one end, steel strand are finished extrusion head earlier and are made when marching into the arena, and steel strand can only be worn to the stretch-draw end from fixed end iron plate, during lashing, note piercing at need and can not resist stubbornly,, and steel strand back and forth gently should be taken out, push away, changeed in case bellows is by bursting, should check in case of necessity whether bellows is clear and coherent, otherwise it should be held up suitable; Fixed end extruding anchor must be close to iron plate; The fixed end ripple mouth of pipe is with steel wire lump and sponge sealing; Lashing is carried out before smashing concrete watering, and adopts following method to protect to exposing steel strand: seal the wrapping Polypropylence Sheet outside steel strand, twine plastic colloidal cloth outward, after lashing is finished bellows is checked, should in time handle if find phenomenon such as broken hole;
When laying the presstressed reinforcing steel construction, fixed support is set to guarantee the laying-out curve of presstressed reinforcing steel,, should at first guarantees the accurate of presstressed reinforcing steel position when presstressed reinforcing steel has when conflict with plain bars or other pipeline positions by the design drawing requirement;
The installation of end anchor backing plate: after the bellows fixed-site well and lashing finishes, anchor plate and spiral bar can be installed, end template should press the end anchor backing plate, should adopt reinforcing bar fix simultaneously, to prevent watering when smashing concrete phenomenons such as generation off normal; After the anchor plate installation, grout hole on the anchor plate is carried out close and protect, fixed end extruding anchor installation site is accurate;
(4) concreting: concrete answers layering to vibrate, and vibration compacting is in time made concrete test block, and stays the concrete test block of establishing with the condition maintenance by the job specfication requirement, to determine the stretch-draw time; Maintenance in time after the concreting is checked and cleaning duct, anchor plate and grout hole;
(5) stretch-draw: a branch of by stretch-draw end pretensioning to 103% by a jack; Again stretch-draw another restraint 103%;
Concrete strength can carry out stretch-draw after should reaching design or code requirement, and the concrete pressure testing report with the condition maintenance should be arranged before the formal stretch-draw;
The stretch-draw stressing sequence of presstressed reinforcing steel is: 0 → 0.2 σ con → 1.03 σ con;
The tension of prestressed tendon proof stress is σ con=0.70fptk;
Elongation value of stretching should measure, and do on-the-spot record at twice from 0.2 σ con → 1.03 σ con;
The tension of prestressed tendon stretch value calculates:
The elongation value of stretching of tension of prestressed tendon calculates by rigorous method, and treating provides after the steel strand modulus of elasticity is determined;
Actual stretch value with calculate the stretch value deviation should be within+6%～-6%, otherwise should suspend stretch-draw, ascertain the reason and continue stretch-draw Ex post; Ground tackle stretch-draw retraction value should be controlled at 5mm;
(6) duct grouting: be in the milk after tension of prestressed tendon finishes;
Be in the milk the previous day, application of pure cement paste envelope in end anchorage place is wrapped up in the space between anchor clipper, only reserves grout hole or venthole;
The portland cement of Grouting Cement using strength 52.5, water/binder ratio are 0.4, and degree of mobilization is 12～18cm, and Grouting Cement is mixed with machinery and stirred;
The duct is once filled in grouting equably from the grout hole that is arranged on curve duct peak, treat to emerge in ground tackle venthole place, two ends can seal venthole after the underflow, and continue to be pressurized to 0.6MPa rear enclosed grout hole; Should check the bleeding situation after the grouting and in time manually mend slurry; Should in time make the cement paste test block during grouting, the cement paste test block adopts 7.07cm * 7.07cm * 7.07cm cube die trial to make, and the compressive strength that mark is supported 28d is not less than 30Mpa;
After the grouting, expose steel strand and cut off, should keep 40～50mm, after the cutting, wrap up in the termination with the coagulation grave but expose steel strand with Abrasive cutting off machine or gas cutting.
The plastics fairlead in the steam vent aperture of reserving on the bellows and the syndeton of bellows joint, comprise the sponge pad 2 that covers on the bellows 1 steam vent aperture, the plastics arc pressuring plate 3 of cover tape protruded tube on the sponge pad, plastics fairlead 4 is sleeved on the protruded tube of plastics arc pressuring plate, and fixes by the galvanized wire 5 and the protruded tube colligation of plastics arc pressuring plate.
Claims (2)
1. a stretching and drawing high-span crossbeam with bonding prestress at single side job practices is characterized in that: comprise the following steps:
(1) the steel strand strand is disconnected:
On the place of smooth drying directly with Abrasive cutting off machine by the root fracture, identical to the steel strand length of using in the same beam hole road, the steel strand of difference bundle, different length specification are carried out classifying and numbering by the prestressing force beam number;
(2) the extruding anchor is made:
Make the fixed end Extrusion anchor ground tackle with extruder, oil meter pressure should be between 3～60MPa during extruding;
(3) lay of bonding prestress muscle is arranged:
Lay base plate, the tied framework reinforcing bar: behind single main muscle and the stirrup, carry out the making of presstressed reinforcing steel about first colligation is finished, the framework crossbeam should be reserved a side side form at least, seals side form again after the bellows laying finishes, so that prestressed girder is worn the muscle construction;
Determine the duct height, electric welding support reinforcing bar: during construction, at first on the stirrup that colligation is finished, determine support reinforcing bar height, support reinforcing bar height should be working drawing soffit to cable wire distance between center line and deducts corresponding bellows radius, the support reinforcing bar adopts Φ 10 above reinforcing bars, level interval 1000mm, and width is identical with the beam stirrup width; Determine earlier position, minimum point place, duct, then along minimum point to both sides by the requirement of level interval the electric welding of support reinforcing bar on stirrup;
Lay bellows: after finishing the support reinforcement installation, get final product the described bellows of lay; The corrugated pipe connector place adopts the joint coupling than the big 5mm of instrumentation tubes diameter to connect; Before wearing bellows, should note checking presentation quality simultaneously, when disrepair phenomenon being arranged, should change pipeline as the discovery bellows; The corrugated pipe connector place must seal with tape;
Bellows is reserved steam vent, and the plastics fairlead in aperture is connected closely knit with the bellows joint, and the plastics fairlead exceeds more than the member end face 200mm, inserts bar dowel so that temporary fixed in the plastics fairlead;
The presstressed reinforcing steel lashing: steel strand adopt single lashing scheme, earlier the steel strand end is packed tightly with friction tape before the lashing, then single steel strand is worn to the other end from bellows one end, steel strand are finished extrusion head earlier and are made when marching into the arena, and steel strand can only be worn to the stretch-draw end from fixed end iron plate, during lashing, note piercing at need and can not resist stubbornly,, and steel strand back and forth gently should be taken out, push away, changeed in case bellows is by bursting, should check in case of necessity whether bellows is clear and coherent, otherwise it should be held up suitable; Fixed end extruding anchor must be close to iron plate; The fixed end ripple mouth of pipe is with steel wire lump and sponge sealing; Lashing is carried out before smashing concrete watering, and adopts following method to protect to exposing steel strand: seal the wrapping Polypropylence Sheet outside steel strand, twine plastic colloidal cloth outward, after lashing is finished bellows is checked, should in time handle if find phenomenon such as broken hole;
When laying the presstressed reinforcing steel construction, fixed support is set to guarantee the laying-out curve of presstressed reinforcing steel,, should at first guarantees the accurate of presstressed reinforcing steel position when presstressed reinforcing steel has when conflict with plain bars or other pipeline positions by the design drawing requirement;
The installation of end anchor backing plate: after the bellows fixed-site well and lashing finishes, anchor plate and spiral bar can be installed, end template should press the end anchor backing plate, should adopt reinforcing bar fix simultaneously, to prevent watering when smashing concrete phenomenons such as generation off normal; After the anchor plate installation, grout hole on the anchor plate is carried out close and protect, fixed end extruding anchor installation site is accurate;
(4) concreting: concrete answers layering to vibrate, and vibration compacting is in time made concrete test block, and stays the concrete test block of establishing with the condition maintenance by the job specfication requirement, to determine the stretch-draw time; Maintenance in time after the concreting is checked and cleaning duct, anchor plate and grout hole;
(5) stretch-draw: a branch of by stretch-draw end pretensioning to 103% by a jack; Again stretch-draw another restraint 103%;
Concrete strength can carry out stretch-draw after should reaching design or code requirement, and the concrete pressure testing report with the condition maintenance should be arranged before the formal stretch-draw;
The stressing sequence of presstressed reinforcing steel is: 0 → 0.2 σ con → 1.03 σ con;
The tension of prestressed tendon proof stress is σ con=0.70fptk;
Elongation value of stretching should measure, and do on-the-spot record at twice from 0.2 σ con → 1.03 σ con;
The tension of prestressed tendon stretch value calculates:
The elongation value of stretching of tension of prestressed tendon calculates by rigorous method, and treating provides after the steel strand modulus of elasticity is determined;
Actual stretch value with calculate the stretch value deviation should be within+6%～-6%, otherwise should suspend stretch-draw, ascertain the reason and continue stretch-draw Ex post; Ground tackle stretch-draw retraction value should be controlled at 5mm;
(6) duct grouting: be in the milk after tension of prestressed tendon finishes;
Be in the milk the previous day, application of pure cement paste envelope in end anchorage place is wrapped up in the space between anchor clipper, only reserves grout hole and venthole;
The portland cement of Grouting Cement using strength 52.5, water/binder ratio are 0.4, and degree of mobilization is 12～18cm, and Grouting Cement is mixed with machinery and stirred;
The duct is once filled in grouting equably from the grout hole that is arranged on curve duct peak, treat to emerge in ground tackle venthole place, two ends can seal venthole after the underflow, and continue to be pressurized to 0.6MPa rear enclosed grout hole; Should check the bleeding situation after the grouting and in time manually mend slurry; Should in time make the cement paste test block during grouting, the cement paste test block adopts 7.07cm * 7.07cm * 7.07cm cube die trial to make, and the compressive strength that mark is supported 28d is not less than 30Mpa;
After the grouting, expose steel strand and cut off, should keep 40～50mm, after the cutting, wrap up in the termination with the coagulation grave but expose steel strand with Abrasive cutting off machine or gas cutting.
2. stretching and drawing high-span crossbeam with bonding prestress at single side job practices according to claim 1, it is characterized in that: the plastics fairlead in the steam vent aperture of reserving on the bellows and the syndeton of bellows joint, comprise the sponge pad that covers on the bellows steam vent aperture, the plastics arc pressuring plate of cover tape protruded tube on the sponge pad, the plastics fairlead is sleeved on the protruded tube of plastics arc pressuring plate, and fixes by the protruded tube colligation of galvanized wire and plastics arc pressuring plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010130234XA CN101798875B (en) | 2010-03-16 | 2010-03-16 | Construction method for stretching and drawing high-span crossbeam with bonding prestress at single side |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010130234XA CN101798875B (en) | 2010-03-16 | 2010-03-16 | Construction method for stretching and drawing high-span crossbeam with bonding prestress at single side |
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| Publication Number | Publication Date |
|---|---|
| CN101798875A CN101798875A (en) | 2010-08-11 |
| CN101798875B true CN101798875B (en) | 2011-04-13 |
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| CN201010130234XA Expired - Fee Related CN101798875B (en) | 2010-03-16 | 2010-03-16 | Construction method for stretching and drawing high-span crossbeam with bonding prestress at single side |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864747B (en) * | 2012-10-26 | 2015-03-11 | 上海市城市建设设计研究总院 | Method for constructing ultra-altitude-difference/overlength/extra-large-tonnage prestress steel beam |
| CN103132456A (en) * | 2013-03-19 | 2013-06-05 | 成军 | Construction method for large span girder with cementation pre-stress |
| CN104131707A (en) * | 2014-08-08 | 2014-11-05 | 青岛海川建设集团有限公司 | Prestressed structure pore passage grouting device and construction method of prestressed structure pore passage grouting device |
| CN107762158B (en) * | 2017-11-16 | 2019-12-06 | 中国水利水电第十一工程局有限公司 | method for mounting exhaust pipe on prestressed corrugated pipe |
| CN114059714A (en) * | 2021-11-09 | 2022-02-18 | 北京城建集团有限责任公司 | Construction process of bonded prestressed beam |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2717869A1 (en) * | 1977-04-22 | 1978-10-26 | Dyckerhoff & Widmann Ag | PROCESS FOR THE MANUFACTURING OF COMPONENTS FROM PRE-TENSIONED CONCRETE |
| CN1609341A (en) * | 2003-10-22 | 2005-04-27 | 上海市基础工程公司 | Over head bridge erection construction technology |
| CN101109227A (en) * | 2007-09-05 | 2008-01-23 | 中国建筑第七工程局 | Construction method of single-stride large cantilever double-pre-stress concrete steel concrete crossbeam |
-
2010
- 2010-03-16 CN CN201010130234XA patent/CN101798875B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2717869A1 (en) * | 1977-04-22 | 1978-10-26 | Dyckerhoff & Widmann Ag | PROCESS FOR THE MANUFACTURING OF COMPONENTS FROM PRE-TENSIONED CONCRETE |
| CN1609341A (en) * | 2003-10-22 | 2005-04-27 | 上海市基础工程公司 | Over head bridge erection construction technology |
| CN101109227A (en) * | 2007-09-05 | 2008-01-23 | 中国建筑第七工程局 | Construction method of single-stride large cantilever double-pre-stress concrete steel concrete crossbeam |
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| CN101798875A (en) | 2010-08-11 |
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