CN101775903A - Construction method for pouring after settlement of reinforced concrete continuous beam with cohesive pre-stress - Google Patents

Construction method for pouring after settlement of reinforced concrete continuous beam with cohesive pre-stress Download PDF

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Publication number
CN101775903A
CN101775903A CN201010100477A CN201010100477A CN101775903A CN 101775903 A CN101775903 A CN 101775903A CN 201010100477 A CN201010100477 A CN 201010100477A CN 201010100477 A CN201010100477 A CN 201010100477A CN 101775903 A CN101775903 A CN 101775903A
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China
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girder
concrete
pouring
settlement
construction
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CN201010100477A
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Chinese (zh)
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CN101775903B (en
Inventor
白少辉
韩宝进
王志鹏
尹宝华
柳俊民
于志强
刘飞
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北京首钢建设集团有限公司
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Publication of CN101775903A publication Critical patent/CN101775903A/en
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Abstract

The invention relates to a construction method for pouring after the settlement of reinforced concrete continuous beam with cohesive pre-stress, which belongs to the technical field of reinforced concrete construction. The template construction of a primary beam, a secondary beam and a floor slab of a reinforced concrete frame structure adopts an early dismantling system framework; the pre-stressed reinforced concrete of the main beam is erected on two spans of brackets, and respectively meets the erection requirements; the tension ends on both sides of the two spans are respectively provided with beam haunches on both sides of the brackets; the beam haunches are respectively designed into the tension ends; pres-stressed reinforced concrete and cast concrete are paved according to the design requirements; after the concrete of the main beam reaches 14 days and 80percent of design strength, the pre-stressed beam on the right side is tensioned; after tensioning, the template early dismantling supporting scaffold of the span is dismantled; the early dismantling system supporting scaffold at the bottom of the pre-stressed beam on the left side is not dismantled, and the concrete at the settled pouring part after settlement is poured after structural settlement, and micro expansion concrete is used to cast the settled poured belt; and after the poured belt concrete after the main beam reaches 14 days and 80percent of design strength, the pre-stressed beam of the span on the left side is tensioned. And the construction method has the advantages of lower construction cost and simple process.

Description

The job practices of bonded prestress pouring after settlement of reinforced concrete continuous beam
Technical field
The invention belongs to the reinforced concrete construction technical field, leave in the job practices that particularly relates to a kind of bonded prestress pouring after settlement of reinforced concrete continuous beam, especially large space, the large span complex environment in the bonded prestress continuous beam of pouring after settlement.
Background technology
At present, the situation that the existing therein ater-casting of known reinforced concrete continuous beam is in the ordinary course of things met binding prestress again is not a lot, in case run into this situation, the regional support scaffolding that conventional job practices is this prestressed girder is not removed, after the sedimentation for the treatment of the ater-casting meets the demands, carry out ater-casting Concrete Construction, prestressed reinforcement of tensioning again, at last, unified this regional support scaffolding of removing, this kind job practices promptly influences total time of construction, cause support scaffolding to remove again, influence the cost of engineering.
Summary of the invention
The object of the present invention is to provide a kind of job practices of bonded prestress pouring after settlement of reinforced concrete continuous beam, overcome when binding prestress is met again in existing ater-casting in the existing reinforced concrete continuous beam, can not unify to remove this regional support scaffolding problem; This job practices can not only shift to an earlier date stretch-draw does not have the cast-in-place beam of prestressed reinforced concrete that pouring after settlement one is striden, and removes this regional scaffold in advance, inserts the next procedure construction in advance, and can guarantee to have the structure of pouring after settlement one side to satisfy force request.
The technical scheme that technical solution problem of the present invention is adopted is: the template construction of the girder of reinforced concrete frame structure, secondary beam and floor adopts early removing system formwork (annotating 1); The prestressed reinforcement of girder is striden the bearing place two and is overlapped, satisfy overlap joint respectively and require (annotating 2), the two stretch-draw ends of striding both sides are provided with haunch in the bearing both sides respectively, are made as the stretch-draw end respectively at the haunch place, lay prestressed reinforcement, concreting by designing requirement (annotating 3); Treat that the girder concrete reaches the prestressed girder on the design strength post tensioning right side of the 14 day length of time and 80%; The dismountable early-dismantling support scaffolding that this is striden after stretch-draw is finished; The early removing system support scaffolding of the prestressed girder bottom in left side is not torn open, treats that structure sediment finishes after-pouring pouring after settlement place concrete, builds pouring after settlement with the microdilatancy concrete; After treating that girder ater-casting concrete reaches the design strength of the 14 day length of time and 80%, stretch-draw left side one prestressed girder of striding; Remove at last and support at the bottom of the girder beam is striden in left side one.
Annotate 1: the early removing system formwork
The girder of reinforced concrete frame structure, the template construction of secondary beam and floor adopts early removing system formwork particular content: promptly when setting up the form bracing system of horizontal structure, emit the girder position line, width by the bracing frame of girder is set up independently support system, the support system horizon bar that is two-way horizon bar and landing slab and secondary beam disconnects, form two independently support systems, when removing the support system of landing slab and secondary beam, can not influence the support system of girder, two support system horizon bars connect temporarily when the casting platform concrete, be used for making two support systems to form an integral body, when concreting satisfies the form removal requirement, remove the template and the support system of platform and secondary beam earlier, reserve (support at prestressing force girder place) according to the support that design is in advance stayed.
Annotate 2: the overlap joint requirement
The prestressed reinforcement of girder is striden the bearing place two and is overlapped, and overlap joint requires particular content:
The prestressed reinforcement of girder is at two overlap joints of striding the bearing place, utilizing frame column to do fulcrum overlaps, the bellows of bonded prestress is in the placement of staggering up and down of the upper position of vertical frame column position main beam in frame, pass the haunch that frame column enters the girder both sides, the design consideration stressing conditions of haunch is determined (generally being not less than 1000 millimeters * 200 millimeters * deck-molding), and the lap length of prestressed reinforcement is not less than haunch length.
Annotate 3: designing requirement
The two stretch-draw ends of striding both sides are provided with haunch in the bearing both sides respectively, are made as the stretch-draw end respectively at the haunch place, lay the prestressed reinforcement particular content by designing requirement:
Prestressed reinforcement is in the laying of haunch position, the prestressed reinforcement of bearing place two directions should overlap in the position on the axis of bearing place girder, should be not less than 70 millimeters between two groups of prestressed reinforcements, support position should be below the girder natural axis at the haunch place, but should be less than 150 millimeters apart from the bottom of the beam.
The invention has the beneficial effects as follows: can be in main structure construction, satisfying under the prerequisite of checking and accepting, prestressed continuous beam with a part carries out prestressed stretch-draw in advance, used early removing system simultaneously, can remove girder support scaffolding in addition in advance, reduced construction cost, do not influenced the stress system of structure when inserting next procedure in advance again, construction technology is simple.
Description of drawings
Below in conjunction with accompanying drawing and example patent of the present invention is further specified.
Fig. 1 is construction technique principle figure of the present invention.Wherein, first prestressed reinforcement 1, second prestressed reinforcement 2, prestressed reinforcement overlap joint 3, pouring after settlement 4, the first haunch stretch-draw end 5, the second haunch stretch-draw end 6.
Fig. 2 is the horizontal profile constructional drawing of stretch-draw end.Wherein, first prestressed reinforcement 1, second prestressed reinforcement 2, the first haunch stretch-draw end 5, the second haunch stretch-draw end 6.
Fig. 3 is a middle part overlap joint horizontal profile constructional drawing.Wherein, first prestressed reinforcement 1, second prestressed reinforcement 2, prestressed reinforcement overlap joint 3.
Fig. 4 is the I-I sectional view of Fig. 3.Wherein, prestressed reinforcement overlap joint 3, pouring after settlement 4.
Fig. 5 is that the job practices of bonded prestress pouring after settlement of reinforced concrete continuous beam is at the application in engineering instance graph.
The specific embodiment
Fig. 1~Fig. 5 is a kind of specific embodiment of the present invention.
In Fig. 1, after concrete strength reached stretch-draw intensity, prestressed reinforcement of tensioning 1 was removed the support system at this place, tore support system the morning at reservation tension reinforcing steel bar 2 places open; After treating that pouring after settlement satisfies settlement request, the concrete of pouring pouring after settlement, after the pouring after settlement concrete strength reached stretch-draw intensity, stretch-draw second prestressed reinforcement 2 was removed the support system at this place.
In Fig. 2, tension reinforcing steel bar 1 and tension reinforcing steel bar 2 overlap by haunch at haunch stretch-draw end 5, haunch stretch-draw end 6 places.
In Fig. 4, stretch-draw first prestressed reinforcement 1 and the stretch-draw second stress reinforcing bar 2 overlap 3 places at prestressed reinforcement and overlap by haunch.The job practices of bonded prestress pouring after settlement of reinforced concrete continuous beam is in the application in engineering (see figure 5)
1 project profile
China's fine horse International Centre mansion annex is the large space frame construction.Adopted the post stretching bonded prestress at the local main beam in frame of E annex, between A, B two main buildings and E annex, be provided with two pouring after settlement, E annex construction pre-stress girder is run through in two ater-castings, and each floor design has many functions room, this zone engineering quantity and operation are various, and the structure construction operation directly influences the time of completion of engineering.
The design of 2 magnificent fine horse International Centre mansion E annex girder post stretching bonded prestresses
China fine horse International Centre mansion E annex is provided with the post stretching bonded prestress from ▽-7.800m~▽ 14.900m girder that is of five storeys, and Vierendeel girder YKL-1~2 are 800mm * 1150mm, and prestressed reinforcement is 4 * 7 ф 15.20; YKL-3~4 are 600mm * 900mm, and prestressed reinforcement is 2 * 7 ф 15.20, prestressed girder span 12800mm.
The design of China fine horse International Centre mansion E annex post stretching bonded prestress haunch, the haunch of prestressed frame beam is in the support position setting, the stretch-draw end outwards extends 1500mm again by the bearing mid point, outwards increases 300mm by both sides, beam limit, the high same deck-molding of haunch.The haunch of prestressed frame beam should be done local the reinforcement at support position, and this engineering prestressed frame beam haunch is strengthened, and adopts B12@80 bidirectional arrangements net sheet, and the length direction that length is set is haunch all is provided with.It is C40 that the concrete strength of prestressing force haunch adopts the concrete identical with prestressed girder.
The constructure scheme design of 3 pouring after settlement place post stretching bonded prestress beams
The part prestressed girder is furnished with binding prestress reinforcement in China's fine horse International Centre engineering.Girder pre-stressed muscle two Span Continuous of bonded prestress arrange that the pouring after settlement position as shown in Figure 1.The intensity of presstressed reinforcing steel participation structure and The deformation calculation.Structure is provided with pouring after settlement, and this partial prestressing beam needs to disconnect at the pouring after settlement place, and construction brings certain influence to total, according to design feature and construction condition, proposes the working design scheme of following early removing system and prestressed reinforcement overlap joint.
Adopt bridging method: presstressed reinforcing steel is laid shown in Fig. 1, Fig. 2,3,4, with former Two prestressed reinforcements of striding exist The bearing place disconnects, and two prestressed reinforcements of striding exist The bearing place overlaps up and down in the both sides of the top of girder natural axis girder respectively, and the process frame column enters the haunch of girder both sides, and stretch-draw end (Fig. 1,3,4) is set respectively below the natural axis of haunch end.The prestressed reinforcement process The bearing place, prestressed reinforcement process frame column enters the haunch of girder both sides, and stretch-draw end (Fig. 1,2) is set below the natural axis of haunch end.Treat main beam concrete intensity reach 14 days and design strength 80% after, partial prestressing is striden on the stretch-draw right side, removes the right side then and strides bottom support, a left side is striden bottom support and is kept.After structure sediment is finished, build pouring after settlement place concrete, build pouring after settlement place concrete reach 14 days and design strength 80% after, presstressed reinforcing steel (as shown in Figure 1) is striden on a stretch-draw left side, removes at last and supports at the bottom of beam is striden on a left side.
4 construction points
For reducing operating expenses, the scaffold of avoiding large tracts of land to support can't be removed, and this structure girder adopts early removing system and prestressed reinforcement overlap joint synthesis construction prestressed continuous beam, and its key step is as follows:
(1) girder, secondary beam and plate concrete structure adopt the cast of early removing system support formwork;
(2) treat that the girder concrete reaches the prestressed girder on the design strength post tensioning right side of the 14 day length of time and 80%;
(3) supporting template system of dismountable right side early removing system support simultaneously;
When (4) treating that pouring after settlement meets the demands settlement request, build pouring after settlement with the microdilatancy concrete;
(5) treat that girder ater-casting concrete reaches the design strength of the 14 day length of time and 80% after, the prestressed girder that stretch-draw pouring after settlement one is striden is that stride on a left side;
(6) remove the early removing system that stride on a left side at last.This engineering has been completed in 2008 and has been come into operation.
5 performance analyses
The job practices that at present domestic and international prestressed girder is met pouring after settlement has two kinds, and the unified support scaffolding (being called for short TPC) and early removing system and prestressed reinforcement removed of promptly conventional prestress concrete beam overlaps synthesis construction prestressed continuous beam pouring after settlement support system (being called for short PRC).
The PRC beam has decomposed whole construction process than the TPC beam, can insert the construction of the operations such as dismounting, secondary structure, finishing and each specialty of this regional support system in advance, shortened the service time of integral-scaffold, reduced construction difficulty, its prestrain mode is consistent with operational phase beam stand under load situation, stressed reasonable, safe in utilization.
Use the PRC technology in the International Centre of fine horse the magnificent engineering, compare with the conventional prestress concrete beam of former design, save support scaffolding and supported nearly year, amounted to 5 layers 3200 square metres, removed support scaffolding in advance, insert next procedure in advance, changed construction technology, reduced the rent of the 3200 square metres of scaffolds in 1 year altogether, total makes structural cost reduce nearly 110,000 yuan, account for overall scaffold and use 9.6% of total cost, have obvious social.
6 conclusions
(1) shows with theory analysis after deliberation: after early removing system that the PRC beam adopts and the prestressed reinforcement overlap joint synthesis construction prestressed continuous beam pouring after settlement support system technology, can reach the purpose of inserting new process in advance, and more conventional prestress concrete beam easy construction, stressed reasonable, shift to an earlier date the duration, reduce expenses, so the PRC technology is rationally feasible.
(2) successful Application of PRC beam early removing system and prestressed reinforcement overlap joint synthesis construction fine horse magnificent International Centre engineering shows that it is practical in engineering practice, and has obtained tangible technical economic benefit.
(3) the PRC beam is still awaiting further research and perfect aspect design theory and the construction technology.

Claims (1)

1. the job practices of a bonded prestress pouring after settlement of reinforced concrete continuous beam is characterized in that, the template construction of the girder of reinforced concrete frame structure, secondary beam and floor adopts the early removing system formwork; The prestressed reinforcement of girder is striden the bearing place two and is overlapped, and satisfies the overlap joint requirement respectively, and the two stretch-draw ends of striding both sides are provided with haunch in the bearing both sides respectively, are made as the stretch-draw end respectively at the haunch place, lay prestressed reinforcement, concreting by designing requirement; Treat that the girder concrete reaches the prestressed girder on the design strength post tensioning right side of the 14 day length of time and 80%; After finishing, stretch-draw removes this early-dismantling support scaffolding of striding; The early removing system support scaffolding of the prestressed girder bottom in left side is not torn open, treats that structure sediment finishes after-pouring pouring after settlement place concrete, builds pouring after settlement with the microdilatancy concrete; After treating that girder ater-casting concrete reaches the design strength of the 14 day length of time and 80%, stretch-draw left side one prestressed girder of striding; Remove at last and support at the bottom of the girder beam is striden in left side one.
CN 201010100477 2010-01-22 2010-01-22 Construction method for pouring after settlement of reinforced concrete continuous beam with cohesive pre-stress CN101775903B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102174855A (en) * 2011-03-30 2011-09-07 吉林大学 Method for adding arc pre-stress steel strand to improve bearing capacity of slab-column node
CN102535861A (en) * 2011-12-29 2012-07-04 中国一冶集团有限公司 Tensioning method for bonded and unbonded combination prestress concrete beams at post-cast strip
CN102561381A (en) * 2011-12-29 2012-07-11 中国一冶集团有限公司 Method for preventing settling and cracking of large-area terrace by using bonded prestressed concrete beams in soft soil layer region
CN103132456A (en) * 2013-03-19 2013-06-05 成军 Construction method for large span girder with cementation pre-stress
CN103397741A (en) * 2013-08-03 2013-11-20 叶长青 Construction method for steel reinforced concrete beam
CN106522561A (en) * 2016-11-02 2017-03-22 中建八局第三建设有限公司 Long-span concrete frame beam bonded prestressed post-cast strip inside stretching construction method
CN107558733A (en) * 2017-09-26 2018-01-09 中国建筑第五工程局有限公司 The construction method that post-concreted expansion strip lower mold holder system is synchronously removed with periphery support for shuttering
CN110206143A (en) * 2019-05-10 2019-09-06 中建八局第二建设有限公司 A kind of construction method of post-stressed assembly concrete frame structure

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102174855A (en) * 2011-03-30 2011-09-07 吉林大学 Method for adding arc pre-stress steel strand to improve bearing capacity of slab-column node
CN102174855B (en) * 2011-03-30 2012-05-02 吉林大学 Method for adding arc pre-stress steel strand to improve bearing capacity of slab-column node
CN102535861A (en) * 2011-12-29 2012-07-04 中国一冶集团有限公司 Tensioning method for bonded and unbonded combination prestress concrete beams at post-cast strip
CN102561381A (en) * 2011-12-29 2012-07-11 中国一冶集团有限公司 Method for preventing settling and cracking of large-area terrace by using bonded prestressed concrete beams in soft soil layer region
CN102535861B (en) * 2011-12-29 2014-09-17 中国一冶集团有限公司 Tensioning method for bonded and unbonded combination prestress concrete beams at post-cast strip
CN103132456A (en) * 2013-03-19 2013-06-05 成军 Construction method for large span girder with cementation pre-stress
CN103397741A (en) * 2013-08-03 2013-11-20 叶长青 Construction method for steel reinforced concrete beam
CN106522561A (en) * 2016-11-02 2017-03-22 中建八局第三建设有限公司 Long-span concrete frame beam bonded prestressed post-cast strip inside stretching construction method
CN106522561B (en) * 2016-11-02 2018-12-14 中建八局第三建设有限公司 Stretch-draw construction method in large-span concrete Vierendeel girder bonded prestress post-cast strip
CN107558733A (en) * 2017-09-26 2018-01-09 中国建筑第五工程局有限公司 The construction method that post-concreted expansion strip lower mold holder system is synchronously removed with periphery support for shuttering
CN110206143A (en) * 2019-05-10 2019-09-06 中建八局第二建设有限公司 A kind of construction method of post-stressed assembly concrete frame structure

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