CN102518315A - Device for strengthening prestressed concrete (PC) steel bars in panel point core area in multi-high-rise frame space - Google Patents
Device for strengthening prestressed concrete (PC) steel bars in panel point core area in multi-high-rise frame space Download PDFInfo
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- CN102518315A CN102518315A CN2011103946647A CN201110394664A CN102518315A CN 102518315 A CN102518315 A CN 102518315A CN 2011103946647 A CN2011103946647 A CN 2011103946647A CN 201110394664 A CN201110394664 A CN 201110394664A CN 102518315 A CN102518315 A CN 102518315A
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Abstract
A device for strengthening a prestressed concrete (PC) steel bars of a panel point core area in a multi-high-rise frame space belongs to the field of civil engineering strengthening construction and comprises the panel point core area, L-shaped anchoring fasteners, the PC steel bars, nuts and sealing caps. A through hole is arranged at one end of each L-shaped anchoring fastener, and a bind hole is arranged at the other end of each L-shaped anchoring fastener and provided with inner threads. The panel point core area is a rectangular area formed by intersecting columns, beams and floor slabs, and polishing treatment is performed to four corners of the panel point core. Two ends of each PC steel bar are provided with outer threads. One end of each L-shaped anchoring fastener is connected with one end of each PC steel bar through the reserved blind hole inner threads, the other end of each L-shaped anchoring fastener penetrates through the other end of each PC steel bar with a reserved through hole to be connected with the nuts. The sealing caps are installed outside the nuts. Four L-shaped anchoring fasteners and four PC steel bars form a circle of PC steel bar hoops for restraining the panel point core area through the nuts. The device can directly bear shearing force, provide three-dimensional restraining effect, relieve stress lagging and improve common working conditions of a novel structure and an existing structure and stress conditions of the core area.
Description
Technical field
The present invention relates to a kind of many high-rise frames space nodes nuclear core district PC rod iron bracing means, belong to rc-frame-beam column space node nuclear core district field of reinforcement.
Background technology
In civil engineering construction, reinforced concrete frame structure is used with its superior anti-seismic performance widely.Wherein bean column node is the frame construction important component part, plays a part to transmit and distribution internal force and assurance structural integrity.When geological process, the shearing that receives in the node nuclear core district is a damageable zone in the frame construction more greatly and very complicated; And the brittle shear destruction in node nuclear core 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 the change of seismic damage, structure design and construction error, building function of use and adds layer, the old building factors such as standard raisings, the change of earthquake resistant code clause of setting up defences and all must carry out corresponding seismic hardening to structure, with the anti-seismic performance of raising structure.Large scale construction, newly-built and reinforcing is laid equal stress on and the maintenance and reinforcement three phases has all been experienced in the engineering construction of developed country in the world.The ratio between investments that the U.S., Britain, Germany are used for maintenance and reinforcement has all surpassed 50% of total investment for construction.And existing nearly 7,000,000,000 m of China
2In the town building, existing 50% has got into the old building that the ageing step needs repairing and reinforces.Therefore, for effective earthquake disaster mitigation, also should strengthen research to the existing building Shockproof reinforcing method.
In building structural element is reinforced, all there is corresponding standard to comply with for the reinforcing design and the construction of beam, post, but because the reinforcing in node nuclear core district and repair very difficulty, at present, still immature reinforcement means and construction technology more do not have the standard of maturation and can comply with.
At present, the reinforcing technique about node nuclear core district that has launched both at home and abroad mainly contains:
(1) increasing section method: through increasing node nuclear core district section area, improve the anchoring situation of the vertical muscle of beam, strengthen node nuclear core district force transmission mechanism, thereby improve sloping section shear resistance and rigidity of section, play the effect of reinforcement and strengthening.Construction technology is simple, compliance is strong, and has ripe design and construction experience; But the situ wet operation is long in time limit, and needs the cutter through-flooring.Should be used for the reinforcing in plane and space nodes nuclear core district.
(2) encased steel reinforcing method: around node nuclear core district, wrap up shaped steel and reinforce; Steel plate is through directly bearing shearing, simultaneously node nuclear core district formed effect of contraction, in increasing section size not; Can improve nuclear core district shear-carrying capacity significantly; Dry construction is simple, and price is low, and the on-the-spot duration is short; Wet construction is simple, and price is low, and is on-the-spot long in time limit.But require the shaped steel surface temperature should be lower than 60 ℃, and field Welding, need carry out preservative treatment.The reinforcing of being suitable for plane and space nodes nuclear core district.
(3) affixing steel plate reinforcement method: in node nuclear core district, utilize structure glue that steel plate is sticked on the surface of examining the core district, steel plate can directly bear shearing, simultaneously node nuclear core district is formed effect of contraction, improves the shear-carrying capacity and the rigidity of section in nuclear core district.Construction is simple, and field Welding is long in time limit.But require the shaped steel surface temperature should be lower than 60 ℃, need carry out preservative treatment.The reinforcing of being suitable for plane node nuclear core district.
(4) paste the carbon fiber reinforcement method: with resin glue carbon fiber or glass fibre sheet are sticked on node nuclear core district and drawn the surface,, improve node nuclear core district's shear-carrying capacity and rigidity of section through directly being cut and retrain nuclear core district concrete.High-strength efficient, corrosion resistance and good endurance do not increase the deadweight and the volume of member, and be widely applicable, is convenient to construction, need not large-scale construction equipment, and speed of application is fast, thereby work efficiency is very high.The reinforcing of being suitable for plane node nuclear core district.
In general, more than several kinds of reinforcement means, be adapted to the reinforcing design in plane node nuclear core district more, have comparatively difficulty and cost is higher, the secondary loading structural strain lags behind, problems such as consolidation effect is not good, site operation inconvenience of structure off-load.And for space nodes, because the existence of orthogonal beam is all around made troubles to the package reinforcing in node nuclear core district, therefore, the reinforcing problem in frame space node nuclear core district is not well solved as yet.
Summary of the invention
The object of the invention is to the problem of existence in said frame space nodes nuclear core district's reinforcing design and the construction a kind of reinforcement means and PC rod iron bracing means to be provided, and can significantly improve the shear-carrying capacity and the anti-seismic performance in node nuclear core district.Have the truss model and barocline rod model according to the stressed of node nuclear core district, this reinforces mainly and realizes with the concrete effect of contraction in reinforcement nuclear core district through directly bearing shearing.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is following:
A kind of many high-rise frames space nodes nuclear core district PC rod iron bracing means; It is characterized in that: comprise node nuclear core district 1, L type anchoring fastener 6, PC rod iron 7, nut 8 and sealing cap 9; One limb of L type anchoring fastener 6 has through hole, and another limb has blind hole, and blind hole is provided with internal thread; The rectangular area that forms is intersected by post 2, beam 3 and floor 4 in said node nuclear core district 1, the processing of polishing in node nuclear four bights, core district;
Said PC rod iron 7 two ends are provided with external screw thread; Described L type anchoring fastener 6 is connected with an end of PC rod iron 7 by the blind hole internal thread of reserving on a limb, and another limb is connected with nut 8 by passing the PC rod iron other end of reserving through hole; Said sealing cap 9 is mounted in nut 8 outsides; Form the rectangle PC rod iron cuff 10 that the said node of a circle constraint is examined core district 1 by four L type anchoring fasteners 6 and four PC rod irons 7 through nut 8.
Further, it is characterized in that: said PC rod iron bolt 7 diameters are 10mm～20mm.
Further, it is characterized in that: said nut 8, it highly is 1.5～2 times of PC rod iron 7 diameters.
Further, it is characterized in that: said PC rod iron cuff 10 is for one or more, and adjacent PC rod iron cuff 10 spacings are 100mm～300mm when a plurality of.
The present invention has the following advantages:
1, consolidation effect is good.The truss model and the rod model that baroclines from node nuclear core district; Adopt prestressing force to be connected to form hoop PC rod iron cuff through PC rod iron and anchoring fastener; Not only can directly bear the shearing in nuclear core district; Also having provides good three-dimensional effect of contraction to nuclear core district, can increase substantially the shear-carrying capacity and the rigidity of section in node nuclear core district, makes it to have better anti.
2, stressed more reasonable.PC rod iron cuff can make node nuclear core district concrete be in the three dimension stress state in advance; Reach good binding effect; The PC rod iron is shared the load of original structure stressed generation for the first time in advance, has alleviated the ess-strain level of original structure, makes that ubiquitous stress delay problem is eased in the reinforcing.Improve the co-operation condition newly add part and original structure, improve the stress performance in nuclear core district greatly.
3, prestressing force applies conveniently.Can apply quantitative prestressing force easily through the PC rod iron, can with rigidity of section different effect of contractions be provided according to the required different shear-carrying capacity of various anti-seismic performances.Sealing cap can provide corrosion-resistanting waterproofing performance preferably, gives follow-uply to apply prestressing force again and repair facilitates.
4, construction is simple, compliance is strong.Have and need not increase to support, need not field Welding, need not heavy-duty machinery, need not unloading, convenient and quick construction, characteristics such as the duration is shorter, and cost is lower.Should in the reinforcing in various planes and space nodes nuclear core district, use.
Member research through the reinforced concrete frame space nodes that adopts apparatus of the present invention to reinforce being examined the core district shows, the crack resistance in node nuclear core district, and shear-carrying capacity all is significantly improved, and ductility can satisfy the anti-seismic performance requirement of frame joint.The present invention in the seismic hardening of existing structure, will have good prospect as a kind of effective bracing means of space nodes.
Through accompanying drawing and embodiment the present invention program is done further detailed description below.
Description of drawings
Fig. 1 uses sketch map for the present invention in frame space node nuclear core district;
Fig. 2 is an A-A sectional drawing among Fig. 1;
Fig. 3 (a) is PC rod iron cuff of the present invention (a 10) modular construction sketch map;
Fig. 3 (b) is L type anchoring fastener of the present invention (6) front projection figure;
Fig. 3 (c) is L type anchoring fastener of the present invention (6) side projection figure;
Fig. 3 (d) is L type anchoring fastener of the present invention (a 6) horizontal projection;
Fig. 3 (e) is L type anchoring fastener of the present invention (a 6) three-view diagram.
Description of reference numerals
1, node nuclear core district, 2, post, 3, beam, 4, floor, 5, the beam pore-forming, 6, L type anchoring fastener, 7, the PC rod iron, 8, nut, 9, sealing cap, 10, PC rod iron cuff.
The specific embodiment
A kind of many high-rise frames space nodes nuclear core district PC rod iron bracing means; It is characterized in that: comprise node nuclear core district 1, L type anchoring fastener 6, PC rod iron 7, nut 8 and sealing cap 9; One limb of L type anchoring fastener 6 has through hole, and another limb has blind hole, and blind hole is provided with internal thread; The rectangular area that forms is intersected by post 2, beam 3 and floor 4 in said node nuclear core district 1, the processing of polishing in node nuclear four bights, core district;
Said PC rod iron 7 two ends are provided with external screw thread; Described L type anchoring fastener 6 is connected with an end of PC rod iron 7 by the blind hole internal thread of reserving on a limb, and another limb is connected with nut 8 by passing the PC rod iron other end of reserving through hole; Said sealing cap 9 is mounted in nut 8 outsides; Form the rectangle PC rod iron cuff 10 that the said node of a circle constraint is examined core district 1 by four L type anchoring fasteners 6 and four PC rod irons 7 through nut 8.
Said PC rod iron cuff 10 is one or more, and adjacent PC rod iron cuff 10 spacings are 100mm～300mm when a plurality of.
1, basic demand
1.1, the concrete on-the-spot strength grade that detects in the frame joint that is reinforced nuclear core district should not be lower than C25.
1.2, should to adopt diameter be 10mm～20mm to the PC rod iron, the height of nut is answered 1.5～2 times of the diameter of bolt.
1.3, the long-term environment temperature of using should not surpass 60 ℃, relative humidity should and not have chemical attack and high humidity high temperature greater than 70%.
2, preparation of construction
2.1, the study design drawing, establishment detailed construction scheme and reinforce thin portion drawing etc.
2.2, PC rod iron, L type anchoring fastener, nut, sealing cap, acetone etc.
2.3, water is drilled to hole 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 → clear up, repair former member → anchoring fastener and fix → PC rod iron installation → prestressed stretch-draw → go along with sb. to guard him.
4, key points for operation
4.1, the beam-ends pore-forming: at the beam-ends depth of section place of required reinforcing, water bores or the Churn drill pore-forming, and removes the floating ash of internal surface of hole clean with compressed air.
4.2, corner surface handles: the node nuclear concrete surface position, four bights, core district to fixing anchoring fastener is smooth with grinder buffing, until spilling the new interface of concrete structure fully, and with compressed air the surface floating ash is removed totally.
4.3, L type anchoring fastener fixes: the anchoring fastener is fixed to polishing position, node nuclear bight, core district, can directly processes by factory, and carry out preservative treatment.
4.4, the PC rod iron installs: the boring of the PC rod iron being passed beam-ends is connected through bolt with the anchoring fastener in bight.And the position through preparatory stretch-draw adjustment PC rod iron cuff, guarantee the precision of installing.It is 10mm～20mm that the PC rod iron adopts diameter, and carries out preservative treatment.PC rod iron cuff can be one or more, for a plurality of time interval S are 100mm～300mm.
4.5, PC rod iron prestressing force applies: utilize torque wrench that the PC rod iron is applied certain prestressing force.The stretch-draw prestressing force that applies for this PC rod iron tensile strength 20%～70%.
4.6, surface protection: because the PC rod iron is through antiseptic,, be need not do anticorrosive work for the joint reinforcing device that is in the general environment; But the concrete component for being in particular surroundings (like high temperature, high humidity, burn into radioactivity etc.) should adopt special safeguard procedures.
The above is merely wherein a kind of embodiment of invention, also can be used for other structural element and reinforce.Can after factory's medium quantity batch processing, directly be applied in the practical structures for PC rod iron cuff.Every any modification that technical spirit is made above embodiment according to the present invention, change or equivalent structure change, and all should belong to the protection domain of technical scheme of the present invention.
Claims (4)
1. high-rise frame space nodes more than a kind is examined core district PC rod iron bracing means; It is characterized in that: comprise node nuclear core district (1), L type anchoring fastener (6), PC rod iron (7), nut (8) and sealing cap (9); One limb of L type anchoring fastener (6) has through hole; Another limb has blind hole, and blind hole is provided with internal thread; The rectangular area that forms is intersected by post (2), beam (3) and floor (4) in said node nuclear core district (1), the processing of polishing in node nuclear four bights, core district;
Said PC rod iron (7) two ends are provided with external screw thread; Described L type anchoring fastener (6) is connected with an end of PC rod iron (7) by the blind hole internal thread of reserving on a limb, and another limb is connected with nut (8) by passing the PC rod iron other end of reserving through hole; Said sealing cap (9) is installed in nut (8) outside; Form the rectangle PC rod iron cuff (10) in a circle said node nuclear core district of constraint (1) through nut (8) by four L type anchoring fasteners (6) and four PC rod irons (7).
2. many high-rise frames space nodes nuclear core district PC rod iron bracing means according to claim 1, it is characterized in that: said PC rod iron bolt (7) diameter is 10mm～20mm.
3. many high-rise frames space nodes according to claim 1 nuclear core district PC rod iron bracing means is characterized in that: said nut (8), it highly is 1.5～2 times of PC rod iron (7) diameter.
4. many high-rise frames space nodes according to claim 1 nuclear core district PC rod iron bracing means is characterized in that: said PC rod iron cuff (10) is for one or more, and adjacent PC rod iron cuff (10) spacing is 100mm～300mm when a plurality of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110394664.7A CN102518315B (en) | 2011-12-02 | 2011-12-02 | Multistory & high-rise frame space nodes He Xin district PC reinforcement steel bars device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110394664.7A CN102518315B (en) | 2011-12-02 | 2011-12-02 | Multistory & high-rise frame space nodes He Xin district PC reinforcement steel bars device |
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| Publication Number | Publication Date |
|---|---|
| CN102518315A true CN102518315A (en) | 2012-06-27 |
| CN102518315B CN102518315B (en) | 2015-12-09 |
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| CN201110394664.7A Expired - Fee Related CN102518315B (en) | 2011-12-02 | 2011-12-02 | Multistory & high-rise frame space nodes He Xin district PC reinforcement steel bars device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847129A (en) * | 2013-05-27 | 2015-08-19 | 华侨大学 | Method for constructing fastening device of reinforced concrete girder and floor slab |
| CN107587724A (en) * | 2017-09-27 | 2018-01-16 | 华南理工大学 | A kind of reinforcement of concrete post structure and its construction method that precast hole steel plate is set |
| CN112983044A (en) * | 2021-04-22 | 2021-06-18 | 江西汉唐特种工程技术有限公司 | Rectangular concrete member outsourcing shaped steel is consolidated and is used fastener |
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|---|---|---|---|---|
| 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 |
| CN101560837A (en) * | 2009-05-21 | 2009-10-21 | 西安建筑科技大学 | Method for consolidating tilting combination structure |
| CN202509789U (en) * | 2011-12-02 | 2012-10-31 | 北京工业大学 | Steel bar for prestressed concrete (PC steel bar) reinforcing device for multiple high-rise frame space node core regions |
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2011
- 2011-12-02 CN CN201110394664.7A patent/CN102518315B/en not_active Expired - Fee Related
Patent Citations (3)
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|---|---|---|---|---|
| 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 |
| CN101560837A (en) * | 2009-05-21 | 2009-10-21 | 西安建筑科技大学 | Method for consolidating tilting combination structure |
| CN202509789U (en) * | 2011-12-02 | 2012-10-31 | 北京工业大学 | Steel bar for prestressed concrete (PC steel bar) reinforcing device for multiple high-rise frame space node core regions |
Non-Patent Citations (1)
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| 阎石 等: "高强钢筋高强混凝土框架梁柱节点抗震性能试验研究", 《沈阳建筑大学学报（自然科学版）》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847129A (en) * | 2013-05-27 | 2015-08-19 | 华侨大学 | Method for constructing fastening device of reinforced concrete girder and floor slab |
| CN107587724A (en) * | 2017-09-27 | 2018-01-16 | 华南理工大学 | A kind of reinforcement of concrete post structure and its construction method that precast hole steel plate is set |
| CN112983044A (en) * | 2021-04-22 | 2021-06-18 | 江西汉唐特种工程技术有限公司 | Rectangular concrete member outsourcing shaped steel is consolidated and is used fastener |
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| CN102518315B (en) | 2015-12-09 |
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