CN102587686B - Device for strengthening PC steel bar in core area of space node of reinforced concrete cylindrical frame - Google Patents
Device for strengthening PC steel bar in core area of space node of reinforced concrete cylindrical frame Download PDFInfo
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- CN102587686B CN102587686B CN201210041320.2A CN201210041320A CN102587686B CN 102587686 B CN102587686 B CN 102587686B CN 201210041320 A CN201210041320 A CN 201210041320A CN 102587686 B CN102587686 B CN 102587686B
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Abstract
The invention relates to a device for strengthening a PC steel bar in a core area of a space node of a reinforced concrete cylindrical frame, belonging to the strengthening construction field of civil engineering. The device comprises a node core area, an arc anchoring buckle, PC steel bars, nuts and a sealing cap, wherein through holes are formed on two legs of the arc anchoring buckle; the node core area is a cylindrical area composed of a column, a beam and a floor, which are intersected; four arc corners of the node core area are polished; external screw threads are arranged on two ends of the PC steel bar; one leg of the arc anchoring buckle is connected with the nut by one end of the PC steel bar penetrating through the preformed through hole; the sealing cap is arranged outside the nut; four arc anchoring buckles and four PC steel bars form a round PC steel bar hoop for limiting the node core area by the nuts. The device can directly bear shearing force, provide three-way constraint action, relieve stress lagging and improve co-working condition of new and old structures and stress condition of the core area.
Description
Technical field
The present invention relates to a kind of PC steel bar in core area of space node of reinforced concrete cylindrical frame bracing means, belong to Reinforced Concrete Circular Cylinder frame space node He Xin district field of reinforcement.
Background technology
In civil engineering construction, reinforced concrete frame structure is widely used with its superior anti-seismic performance.Wherein bean column node is frame construction important component part, plays a part to transmit and distributes internal force and guarantee structural integrity.When geological process, the shearing being subject in node He Xin district is more greatly and very complicated, it is damageable zone in frame construction, and the brittle shear failure in node He Xin district, often cause collapsing of total, so, in seismic design, adopt " strong shear capacity and weak bending capacity, strong column and weak beam, the weak member of strong node " design principles.
When engineering structures suffers seismic damage, structure design and construction error, building, use function change and add layer, the old building factors such as standard raising, the change of earthquake resistant code clause of setting up defences and all must carry out corresponding seismic hardening to structure, to improve the anti-seismic performance of structure.Large scale construction has all been experienced in the engineering construction of developed country in the world, newly-built and reinforcing is laid equal stress on and maintenance and reinforcement three phases.The U.S., Britain, Germany have all surpassed 50% of total investment for construction for the ratio between investments of maintenance and reinforcement.And existing nearly 7,000,000,000 m of China
2in town building, existing 50% has entered the old building that the ageing step needs repairing and reinforces.Therefore,, for effective earthquake disaster mitigation, also should strengthen the research to existing building Shockproof reinforcing method.
In building structural element is reinforced, for reinforcing design and the construction of beam, post, have corresponding standard to comply with, but due to the reinforcing in node He Xin district with repair very difficultly, at present, still immature reinforcement means and construction technology, more can comply with without ripe standard.
At present, the reinforcing technique about node He Xin district having launched both at home and abroad mainly contains:
(1) Enlargement of Section: by increasing node He Xin district section area, improve the anchor situation of the vertical muscle of beam, strengthen node He Xin district force transmission mechanism, thereby improve anti-shear ability and rigidity of section, play the effect of reinforcement and strengthening.Construction technology is simple, strong adaptability, and has ripe design and construction experience; But situ wet operation is long in time limit, and need cutter through-flooring.Should be for the reinforcing in plane and space nodes He Xin district.
(2) reinforced with external steel encased: reinforce at node He Xin district surrounding parcel shaped steel, steel plate is by directly bearing shearing, node He Xin district is formed to effect of contraction simultaneously, in increasing section size not, can improve significantly He Xin district shear-carrying capacity, dry construction is simple, and price is low, and the on-the-spot duration is short; Wet construction is simple, and price is low, on-the-spot long in time limit.But require the shaped steel surface temperature should be lower than 60 ℃, and Site Welding, need carry out preservative treatment.The reinforcing of being suitable for plane and space nodes He Xin district.
(3) affixing steel plate reinforcement method: in node He Xin district, utilize structure glue by the surface in steel sticking He Xin district, steel plate can directly bear shearing forms effect of contraction to node He Xin district simultaneously, improves shear-carrying capacity and the rigidity of section in He Xin district.Construction is simple, and Site Welding is long in time limit.But require shaped steel surface temperature lower than 60 ℃, need carry out preservative treatment.The reinforcing of being suitable for plane node He Xin district.
(4) sticking carbon fiber reinforcing method: with resin glue, carbon fiber or glass fibre sheet are sticked on to tension surface, node He Xin district, by directly being cut and retrain center concrete, improve node He Xin district's shear-carrying capacity and rigidity of section.High-strength efficient, corrosion resistance and good endurance, do not increase deadweight and the volume of member, widely applicable, constructability, and without large-scale construction equipment, speed of application is fast, thereby work efficiency is very high.The reinforcing of being suitable for plane node He Xin district.
In general, above several reinforcement means, are adapted to the reinforcing design in plane node He Xin district more, have structure off-load comparatively difficulty and the problems such as cost is higher, secondary loading structural strain lags behind, consolidation effect is not good, site operation is inconvenient.And for cylindrical frame space nodes, due to the existence of surrounding orthogonal beam, make troubles to the package reinforcing in node He Xin district, therefore, the reinforcing problem in cylindrical frame space nodes He Xin district is not yet well solved.
Summary of the invention
The object of the invention is the problem existing in above-mentioned Reinforced Concrete Circular Cylinder frame space node He Xin district's reinforcing design and construction, a kind of reinforcement means and PC rod iron bracing means are provided, can significantly improve shear-carrying capacity and the anti-seismic performance in node He Xin district.According to the stressed of node He Xin district, have truss model and the rod model that baroclines, this reinforces mainly and realizes by directly bearing the effect of contraction of shearing and reinforcement center concrete.
For achieving the above object, the technical solution used in the present invention is as follows:
A bracing means, is characterized in that: described node He Xin district is for being intersected the cylindrical region forming by post, beam and floor; Described PC rod iron bracing means comprises arc anchoring fastener, PC rod iron, nut and sealing cap, the both sides of described arc anchoring fastener are provided with two vertical with beam respectively limbs, and the inner side arcwall face in the middle of described arc anchoring fastener and the arc bight in node He Xin district fit tightly; Two limbs of described arc anchoring fastener have through hole, in through hole, be provided with PC rod iron, the two ends of described PC rod iron are provided with external screw thread, on external screw thread, be provided with nut, described sealing cap is arranged on nut outside, every PC rod iron passes a limb of the arc anchoring fastener of beam and beam both sides, thereby two arc anchoring fasteners of beam both sides are connected and fixed; Four arc anchoring fasteners and four PC rod irons form the circular PC rod iron cuff in a circle constraint described node He Xin district by nut.
Further, four arc angles in described node He Xin district are carried out grinding process.
Further, described PC rod iron diameter is 10mm～20mm.
Further, the height of described nut is 1.5～2.0 times of described PC rod iron diameter.
Further, described PC rod iron cuff is one or more layers, and during for multilayer, the spacing of adjacent PC rod iron cuff is 100mm～300mm.
The present invention has the following advantages:
1, consolidation effect is good.From the truss model in node He Xin district and the rod model that baroclines, by PC rod iron and arc anchoring fastener, adopt prestressing force to be connected to form hoop PC rod iron cuff, not only can directly bear the shearing in He Xin district, also have Dui Hexin district that good three-dimensional effect of contraction is provided, shear-carrying capacity and the rigidity of section that can increase substantially node He Xin district, make it to have good anti-seismic performance.
2, stressed more reasonable.PC rod iron cuff can make node center concrete in advance in three dimension stress state, reach good binding effect, PC rod iron is shared the load of original structure stressed generation for the first time in advance, has alleviated the stress level of original structure, and in making to reinforce, ubiquitous stress hysteresis problem is eased.Improve the co-operation condition of the old and new's structure, greatly improve the force-bearing situation in He Xin district.
3, prestress application is convenient.By PC rod iron, can apply easily quantitative prestressing force, can provide different effect of contractions according to the required different shear-carrying capacity of various anti-seismic performances and rigidity of section.Sealing cap can provide corrosion-resistanting waterproofing performance preferably, gives follow-uply to apply prestressing force again and repair facilitates.
4, simple, the strong adaptability of construction.Have without increase supporting, without Site Welding, without heavy-duty machinery, without unloading, convenient and quick construction, the feature such as the duration is shorter, and cost is lower.Should in the reinforcing in various planes and space nodes He Xin district, use.
By member research in the Reinforced Concrete Circular Cylinder frame space node He Xin district of employing apparatus of the present invention reinforcing is shown, the crack resistance in node He Xin district, shear-carrying capacity is all significantly improved, and ductility can meet the anti-seismic performance requirement of frame joint.The present invention, as a kind of effective bracing means of cylindrical frame space nodes, in the seismic hardening of existing structure, will have good prospect.
Below by drawings and Examples, the present invention program is described in further detail.
Accompanying drawing explanation
Fig. 1 is that the present invention is at cylindrical frame space nodes He Xin district application schematic diagram;
Fig. 2 is A-A sectional drawing in Fig. 1;
Fig. 3 is PC rod iron cuff of the present invention (10) modular construction schematic diagram;
Fig. 4 is arc anchoring fastener of the present invention (6) front projection figure;
Fig. 5 is arc anchoring fastener of the present invention (6) side projection figure;
Fig. 6 is arc anchoring fastener of the present invention (6) horizontal projection;
Fig. 7 is arc anchoring fastener of the present invention (6) 3-D view.
Description of reference numerals
1, node He Xin district, 2, post, 3, beam, 4, floor, 5, beam pore-forming, 6, arc anchoring fastener,
7, PC rod iron, 8, nut, 9, sealing cap, 10, PC rod iron cuff.
The specific embodiment
As shown in Fig. 1-7, a kind of PC steel bar in core area of space node of reinforced concrete cylindrical frame bracing means of the present invention, wherein, the cylindrical region forming intersects by post 2, beam 3 and floor 4 in node He Xin district 1; PC rod iron bracing means comprises arc anchoring fastener 6, PC rod iron 7, nut 8 and sealing cap 9, the both sides of arc anchoring fastener 6 are provided with two vertical with beam 3 respectively limbs, and the inner side arcwall face in the middle of arc anchoring fastener 6 and the arc bight in node He Xin district fit tightly; Two limbs of arc anchoring fastener 6 have through hole, in through hole, be provided with PC rod iron 7, the two ends of described PC rod iron 7 are provided with external screw thread, on external screw thread, be provided with nut 8, described sealing cap 9 is arranged on nut 8 outsides, every PC rod iron 7 is through a limb of the arc anchoring fastener 6 of the beam pore-forming 5 in beam 3 and beam 3 both sides, thereby two arc anchoring fasteners 6 of beam 3 both sides are connected and fixed; Four arc anchoring fasteners 6 and four PC rod irons 7 form the circular PC rod iron cuff 10 in a circle constraint described node He Xin district 1 by nut 8.Wherein, four arc angles in node He Xin district 1 are carried out grinding process, and PC rod iron 7 diameters are 10mm～20mm, and the height of nut 8 is 1.5～2.0 times of described PC rod iron 7 diameters, PC rod iron cuff 10 is multilayer, and the spacing of adjacent PC rod iron cuff 10 is 100mm～300mm.
Construction requirement of the present invention is as follows:
1, basic demand
The strength grade of the cylinder node He Xin district 1 concrete Site Detection 1.1, being reinforced should be lower than C25.
1.2, should to adopt diameter be 10mm～20mm to PC rod iron 7, and the height of nut 8 is answered 1.5～2.0 times of the diameter of bolt.
1.3, the long-term environment temperature of using should not surpass 60 ℃, and relative humidity should not be greater than 70% and without chemical attack and high humidity high temperature.
2, preparation of construction
2.1, study design drawing, works out detailed construction scheme and reinforces thin portion drawing etc.
2.2, PC rod iron 7, arc anchoring fastener, nut 8, sealing cap 9, acetone etc.
2.3, water bores pore-forming equipment or Churn drill, angle grinding machine or abrasive machine, torque wrench, wire brush, hairbrush, gloves, steel ruler etc.
3, construction technology process
Preparation of construction → calibration position → cleaning, repair fix → PC of former member → anchoring fastener rod iron 7 installation → prestressed stretch-draws → go along with sb. to guard him.
4, key points for operation
4.1, beam-ends pore-forming: at the beam-ends depth of section place of required reinforcing, water bores or Churn drill pore-forming, and with compressed air, the floating ash of internal surface of hole is removed clean.
4.2, corner surface is processed: the concrete surface position, 1 four bights, node He Xin district to fixing anchoring fastener is smooth with grinder buffing, until spill the new interface of concrete structure completely, and with compressed air, the floating ash in surface is removed clean.
4.3, arc anchoring fastener 6 is fixing: anchoring fastener is fixed to polishing position, arc bight, node He Xin district ，Ke You factory and directly processes, and carry out preservative treatment.
4.4, PC rod iron 7 is installed: PC rod iron 7 is bolted through the boring of beam-ends and the anchoring fastener in bight.And by the position of pre-stretch-draw adjustment PC rod iron cuff 10, guarantee the precision of installing.It is 10mm～20mm that PC rod iron 7 adopts diameter, and carries out preservative treatment.PC rod iron cuff 10 can be one or more, for a plurality of time interval S are 100mm～300mm.
4.5, PC rod iron 7 prestress applications: utilize torque wrench to apply certain prestressing force to PC rod iron 7.The stretch-draw prestressing force that applies for these PC rod iron 7 tensile strength 20%～70%.
4.6, surface protection: because PC rod iron 7 is through antiseptic, for the cylinder node bracing means in general environment, be not need to do anticorrosive work; But for being in particular surroundings as the concrete component of high temperature, high humidity, burn into radioactivity etc., should adopt special safeguard procedures.
The above, be only wherein a kind of embodiment of invention, also can be in other strengthening of structural elements.For PC rod iron cuff, can, after factory's medium quantity batch processing, directly be applied in practical structures.Every any modification of above embodiment being made according to the technology of the present invention essence, change or equivalent structure change, and all should belong to the protection domain of technical solution of the present invention.
Claims (5)
1. a PC steel bar in core area of space node of reinforced concrete cylindrical frame bracing means, is characterized in that: described node He Xin district (1) is for being intersected the cylindrical region forming by post (2), beam (3) and floor (4); Described PC rod iron bracing means comprises arc anchoring fastener (6), PC rod iron (7), nut (8) and sealing cap (9), the both sides of described arc anchoring fastener (6) are provided with two vertical with beam (3) respectively limbs, and the inner side arcwall face in the middle of described arc anchoring fastener (6) and the arc bight in node He Xin district fit tightly; Two limbs of described arc anchoring fastener (6) have through hole, in through hole, be provided with PC rod iron (7), the two ends of described PC rod iron (7) are provided with external screw thread, on external screw thread, be provided with nut (8), described sealing cap (9) is arranged on nut (8) outside, every PC rod iron (7) passes a limb of the arc anchoring fastener (6) of beam (3) and beam (3) both sides, thereby two arc anchoring fasteners (6) of beam (3) both sides are connected and fixed; Four arc anchoring fasteners (6) and four PC rod irons (7) form by nut (8) the circular PC rod iron cuff (10) that a circle retrains described node He Xin district (1).
2. PC steel bar in core area of space node of reinforced concrete cylindrical frame bracing means according to claim 1, is characterized in that: grinding process is carried out in four arc bights in described node He Xin district (1).
3. PC steel bar in core area of space node of reinforced concrete cylindrical frame bracing means according to claim 1, is characterized in that: described PC rod iron (7) diameter is 10mm～20mm.
4. PC steel bar in core area of space node of reinforced concrete cylindrical frame bracing means according to claim 1, is characterized in that: the height of described nut (8) is 1.5～2.0 times of described PC rod iron (7) diameter.
5. PC steel bar in core area of space node of reinforced concrete cylindrical frame bracing means according to claim 1, it is characterized in that: described PC rod iron cuff (10) is one or more layers, and during for multilayer, the spacing of adjacent PC rod iron cuff (10) is 100mm～300mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210041320.2A CN102587686B (en) | 2012-02-21 | 2012-02-21 | Device for strengthening PC steel bar in core area of space node of reinforced concrete cylindrical frame |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210041320.2A CN102587686B (en) | 2012-02-21 | 2012-02-21 | Device for strengthening PC steel bar in core area of space node of reinforced concrete cylindrical frame |
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| CN102587686A CN102587686A (en) | 2012-07-18 |
| CN102587686B true CN102587686B (en) | 2014-01-22 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6215552B2 (en) * | 2013-03-27 | 2017-10-18 | 株式会社フジタ | Hybrid structure and construction method thereof |
| TWI554667B (en) * | 2014-11-28 | 2016-10-21 | 江文財 | Assembly buckling restrained brace using steel bar |
| CN104863268A (en) * | 2015-05-27 | 2015-08-26 | 浙江工业大学 | PC steel rod reinforcing method for improving anti-seismic property of special-shaped column joint |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10152996A (en) * | 1996-11-26 | 1998-06-09 | Shimizu Corp | Reinforcing method of column-beam connecting section of existing building |
| CN2723551Y (en) * | 2004-07-13 | 2005-09-07 | 建研科技股份有限公司 | Frame beam and pole node reinforcing device |
| JP3771105B2 (en) * | 2000-03-16 | 2006-04-26 | 高周波熱錬株式会社 | Reinforcing apparatus and reinforcing method for concrete rod-like structure |
| JP3772247B2 (en) * | 1997-06-11 | 2006-05-10 | 株式会社竹中工務店 | Seismic reinforcement method for bending of existing large beams |
| JP3856745B2 (en) * | 2002-09-17 | 2006-12-13 | 株式会社竹中工務店 | Bending reinforcement method for joints between existing columns and beams or slabs |
| JP3884751B2 (en) * | 2004-11-26 | 2007-02-21 | 高周波熱錬株式会社 | Mounting member for shear reinforcement |
| CN201588411U (en) * | 2009-12-10 | 2010-09-22 | 华侨大学 | Strengthening device of beam column node of reinforced concrete |
| CN202509791U (en) * | 2012-02-21 | 2012-10-31 | 北京工业大学 | Steel bar for prestressed concrete (PC steel bar) reinforcing device for reinforced concrete cylindrical frame space node core region |
-
2012
- 2012-02-21 CN CN201210041320.2A patent/CN102587686B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10152996A (en) * | 1996-11-26 | 1998-06-09 | Shimizu Corp | Reinforcing method of column-beam connecting section of existing building |
| JP3608137B2 (en) * | 1996-11-26 | 2005-01-05 | 清水建設株式会社 | Reinforcement method for pillars and beam joints of existing buildings |
| JP3772247B2 (en) * | 1997-06-11 | 2006-05-10 | 株式会社竹中工務店 | Seismic reinforcement method for bending of existing large beams |
| JP3771105B2 (en) * | 2000-03-16 | 2006-04-26 | 高周波熱錬株式会社 | Reinforcing apparatus and reinforcing method for concrete rod-like structure |
| JP3856745B2 (en) * | 2002-09-17 | 2006-12-13 | 株式会社竹中工務店 | Bending reinforcement method for joints between existing columns and beams or slabs |
| CN2723551Y (en) * | 2004-07-13 | 2005-09-07 | 建研科技股份有限公司 | Frame beam and pole node reinforcing device |
| JP3884751B2 (en) * | 2004-11-26 | 2007-02-21 | 高周波熱錬株式会社 | Mounting member for shear reinforcement |
| CN201588411U (en) * | 2009-12-10 | 2010-09-22 | 华侨大学 | Strengthening device of beam column node of reinforced concrete |
| CN202509791U (en) * | 2012-02-21 | 2012-10-31 | 北京工业大学 | Steel bar for prestressed concrete (PC steel bar) reinforcing device for reinforced concrete cylindrical frame space node core region |
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