CN102587684B - Installation underpinning method for existing framed building reinforced by parallel seismic isolation supports - Google Patents
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- 238000002955 isolation Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000009434 installation Methods 0.000 title claims abstract description 24
- 238000009424 underpinning Methods 0.000 title abstract description 11
- 238000010276 construction Methods 0.000 claims abstract description 30
- 239000004567 concrete Substances 0.000 claims abstract description 19
- 230000035939 shock Effects 0.000 claims description 87
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 71
- 230000003014 reinforcing effect Effects 0.000 claims description 25
- 238000013461 design Methods 0.000 claims description 16
- 230000008859 change Effects 0.000 claims description 15
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 10
- 230000010412 perfusion Effects 0.000 claims description 9
- 229920001084 poly(chloroprene) Polymers 0.000 claims description 7
- 238000012546 transfer Methods 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 claims description 6
- 238000011109 contamination Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
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- 230000003068 static effect Effects 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract 2
- 239000011150 reinforced concrete Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 10
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Abstract
The invention relates to an installation underpinning method for an existing framed building reinforced by parallel seismic isolation supports, which belongs to the field of seismic isolation reinforcement. The installation underpinning method includes manufacturing upper brackets and lower brackets between a foundation and a sill of a multilayer frame structure and installing the seismic isolation supports; cutting off reinforced concrete columns among the seismic isolation supports after the concrete strength of the brackets reaches a designed value; safely transferring load on the structure columns onto the seismic isolation supports; and accordingly achieving the designed purpose of seismic isolation of the existing framed building. By the aid of the method, structural safety of underpinning construction is guaranteed, engineering progress is simplified and accelerated, construction devices and underpinning components are saved, accordingly, engineering manufacturing cost is lowered, and the installation underpinning method is extremely practical framed foundation seismic isolation construction technique.
Description
Technical field
The present invention relates to a kind of strengthening reconstruction method, particularly a kind of existing framed building adopts the installation support and change method of Parallel Isolation bearing reinforcing, belongs to aseismatic reinforcement field.
Background technology
Base isolation refers to and arrange shock insulation bed course between superstructure and basis, utilize Seismic Isolation of Isolation Layer to isolate and dissipation seismic energy, avoid and reduce seismic energy to top structural transmission, thus reach a kind of Passive Control technology of superstructure vibration reduction, there is safety good, cheap, to be currently widely used in new building.It is a kind of comparatively ripe structural earthquake control technology.But in existing building strengthening reconstruction, adopt Base Isolation Technology also rare, main cause be shock isolating pedestal insert and underpinning technique complicated, also do not have the technology of the specification of a set of maturation to apply, have impact on the application of seismic isolation technology in this field and development.
Following two kinds are mainly contained about shock isolating pedestal installation underpinning technique and pluses and minuses thereof in prior art:
One, adopt steel pipe to shore the installation of beam method and underpin shock isolating pedestal
This law is base isolation stiffening frame structure, installs the method that shock isolating pedestal is conventional in frame column.The general principle of the method is: utilize steel pipe to shore at framework beam-ends, structure vertical load is passed to steel pipe by framework beam-ends, then passes to grade beam by steel pipe or directly pass to basis.Frame column is freed, then blocks in the appointed part of post, isolation cushion and reinforced column are installed.After installing, reach design strength, lay down supporting steel pipe, vertical load is shifted again, complete the setting of base isolation pad.
The feature of the method is: underpin component few, and easy construction has certain security reliability, is easily accepted by unit in charge of construction, and cost is cheaper.Unit over half is had to adopt this support and change method in current construction.The deficiency of the method is that load transmission passes to steel column by beam, back transfer, and the supporting capacity tackling beam in design reliably checks.Steel pipe column and back tightly only hold out against by hitting wedge-shaped steel plate.Pressure complete by feel and construction experience determine, cannot Quantitatively Selecting be carried out.Add unsafe factor and uncontrollability, control also more difficult to the vertical displacement of structure, therefore this support and change method has the necessity improved further and improve.
Two, post selve support, jack jacking underpins method
The operating principle of the method utilizes the post selve support installing shock isolating pedestal, completed cut off post and underpin installation by the jacking of jack.Generally first use Enlargement of Section reinforced column, and the upper and lower end of coupled columns arrange jack lay bracket (also can according to patten situation, lower prop position arranges jack cushion cap), bracket is arranged symmetrically with, and generally arranges two, bracket is laid synchro system and controls self-locking type hydraulic jack, total vertical load according to post selects jack, by jack top lift will pillared firmly, then cut off post, lay neoprene bearing, complete the work of underpining.
Originally the advantage underpining method directly utilizes post self to carry out jacking to underpin, and the transmission of power directly, reliably.Avoid carrying out transmission by beam and add safety factor.Apply top lift with jack, can accurately control the step that exerts a force and size by designing requirement, this point is that steel pipe is shored corbel to change method incomparable.The shortcoming of this method is construction slightly complicated, must purchase necessary equipment, and should grasp correlation technique.Generally mostly be technical force, the stabilization works company that financial capability is stronger adopts.
Above-mentioned two kinds of shock isolating pedestals install support and change method, common feature: be first shifted by steel pipe or jack by the load on post, then cut off post, underpin arrangement shock isolating pedestal.All to carry out load intermediate transfer and just can complete installation task, virtually add construction sequence, the complexity of structural load conversion component and construction and unsafe factor.
Summary of the invention
In order to overcome above-mentioned defect, the present invention proposes the installation support and change method that a kind of existing framed building adopts Parallel Isolation bearing to reinforce, its mode that have employed Parallel Isolation first carries out strengthening reconstruction to existing framework, simplify implantation and the support and change method of isolation cushion, eliminating Lifting Equipment, is a kind of installation support and change method of more direct, safer, easier shock isolating pedestal.
To achieve these goals, this invention takes following technical scheme:
The installation support and change method that existing framed building adopts Parallel Isolation bearing to reinforce, is characterized in that: comprise the steps:
Step one: carry out base isolation Parallel Isolation reinforcing design according to existing framed building, and the shock isolating pedestal layout plan of foundation Parallel Isolation reinforcing design, shock isolating pedestal combining form, shock isolating pedestal kind, shock isolating pedestal size and parameters combination verification shock isolating pedestal are (namely by repeatedly checking, continuous adjustment above-mentioned parameter, finally determine type and the arrangement of optimal shock isolating pedestal, thus reach optimum isolating affection, this is the design usually adopted in shock design);
Step 2: reinforce the basis of existing framed building and the post between basis and upper frame bottom girder, the upper of layout design construction shock isolating pedestal is pressed around described post, lower bracket, wherein, on every root post, between lower bracket, same level position arranges 2 ~ 4 shock isolating pedestals, comprise at least one neoprene bearing and at least one friction slipper, these shock isolating pedestals are parallel with one another, and along framework bottom girder direction in "-" type, T-shape or "+" type are arranged, thus form Parallel Isolation bearing, on, the magnitude setting of lower bracket and setting position should be corresponding with the quantity of shock isolating pedestal and position, on, lower bracket construction should be laid to arrange with shock isolating pedestal and be carried out simultaneously, its concrete steps are:
(1): lower bracket reinforcing bar and installation form are reinforced in colligation, at lower bracket reinforcing bar top, shock isolating pedestal lower support plate is set, and shock isolating pedestal is laid by bottom pad plate and bolt sleeve be fixed in lower bracket reinforcing bar and lower support plate, after calibrating the planeness of shock isolating pedestal, verticality and horizontal level deviation, bracket concrete under overall perfusion;
(2): shock isolating pedestal upper padding plate and bolt sleeve are installed, on upper padding plate, bracket reinforcing bar and installation form are reinforced in colligation, and upper bracket plate is set bottom upper bracket reinforcing bar, shock isolating pedestal is fixedly installed on upper bracket reinforcing bar and upper bracket plate by upper padding plate and bolt sleeve, after all in place, bracket concrete on overall perfusion, during perfusion, should ensure not stay gap between shock isolating pedestal and upper bracket, prevent vertical displacement from exceeding standard;
Step 3: reach after design strength until concrete, cuts off the post between upper and lower bracket, and load on post is directly passed to shock isolating pedestal, then passes to lower prop and basis, thus forms framework Seismic Isolation of Isolation Layer; Displacement structure, distortion complete monitoring and record should be carried out when cutting post, cut off post and answer interleaved segmentation to carry out, allow load transfer progressively complete, ensure smooth transition and the structural safety of load;
Step 4: after having constructed, according to drawing requirement, carries out anticorrosion flameproof protection to shock isolating pedestal;
Step 5: by enclosed beam, the plate of drawing construction framework Seismic Isolation of Isolation Layer upper end, meanwhile, reserves access path and reserved maintenance according to drawing, changes manhole, ensures the inspection of Seismic Isolation of Isolation Layer, component maintenance and changes.
Wherein, during step 2 construction, the whole process protection to shock isolating pedestal should be noted, prevent shock isolating pedestal by Concrete contamination.
In described step 3, boring is adopted to add the pneumatic pick manual process of chopping, the concrete cutting machine process of chopping, the hydraulic splitting machine process of chopping or nuisanceless static blasting method when cutting off post.
In described step 3, quincunx interval when cutting off post, is specifically adopted to cut off construction.
In described step 4, the material selected by anticorrosion flameproof protection must not hinder structure along the displacement of Seismic Isolation of Isolation Layer horizontal direction and vertical displacement.
Beneficial effect
Though vibration-isolating system has plurality of advantages, laminated rubber vibration isolation technology does not almost have function of shock insulation for vertical seismic action, and can not avoid mesomerism completely.Sliding base-isolation technology can not automatically reset, and generally separately should establish resetting system, and slippage is excessive easily occurs slippage unstability.In order to the performance improving shock isolation system proposes composite shock insulation thought.
The parallel composite isolator adopts laminated rubber bearing and friction slipper parallel connection to be composited.In system, laminated rubber bearing provides system centripetal reset force, can automatically reset, friction support hysteretic energy, has good energy dissipation capacity, has merged the advantage of two kinds of bearings above, improve the shortcoming of single bearing, greatly improve the shock resistance of building structure, be a kind of simple, economical, effective, there is the base isolation support style of application prospect.
Adopt the parallel composite isolator, the gravity load of superstructure can by laminated rubber bearing and friction slipper shared, the size of so obvious reduction neoprene bearing, quantity.Add the natural vibration period of structure, reduce yield shear force, add damping force, reduce cost.For existing frame construction, select Parallel Isolation combined isolator, meaning is great especially, simplify installation and the underpinning technique of bearing, load can be made directly to transfer on shock isolating pedestal from post, then going down, eliminate load transfer step, add the safety of system.Meanwhile, engineering practice calculates and also shows, when bearing in parallel bears vertical load change, Seismic Isolation of Isolation Layer maximum horizontal displacement declines to some extent, is favourable to overall structure.System has adaptive guard characteristic
The feature of method of the present invention non-single shock isolating pedestal under taking full advantage of each fulcrum, complete the arrangement underpinning construction of shock isolating pedestal, greatly simplify and accelerate programming, ensure that the structural safety of underpinning construction, save construction equipment and underpin component, thus reducing construction costs, for the application of base isolation reinforcement on existing frame engineering, opening wide prospect, is the main cutting point of our research and innovation, is also the effective method of the existing framed building of base isolation reinforcement from now on.
Accompanying drawing explanation
Fig. 1 is that Parallel Isolation bearing of the present invention and bracket reinforce layout schematic diagram;
Fig. 2 is that shock isolating pedestal of the present invention is in "-" type arrangement one schematic diagram;
Fig. 3 is that shock isolating pedestal of the present invention is in "-" type arrangement two schematic diagram;
Fig. 4 is shock isolating pedestal of the present invention is that T-shape arranges schematic diagram;
Fig. 5 is that shock isolating pedestal of the present invention is in "+" type arrangement one schematic diagram;
Fig. 6 is that shock isolating pedestal of the present invention is in "+" type arrangement two schematic diagram;
In figure, 1-basis; 2-shock isolating pedestal; Bracket under 3-; The upper bracket of 4-; 5-bolt sleeve; 6-framework bottom girder; The shut of 7-Seismic Isolation of Isolation Layer upper end; The enclosed beam of 8-Seismic Isolation of Isolation Layer upper end; 9-upper box trestle; 10-post (finally will cut off).
Detailed description of the invention
The specific embodiment of the present invention is as follows:
Embodiment 1
As Figure 1-3, the installation support and change method that a kind of existing framed building of the present invention adopts Parallel Isolation bearing to reinforce, comprises the steps:
Step one: carry out base isolation Parallel Isolation reinforcing design according to existing framed building, and the shock isolating pedestal layout plan of foundation Parallel Isolation reinforcing design, shock isolating pedestal combining form, shock isolating pedestal kind, shock isolating pedestal size and parameters combination verification shock isolating pedestal 2;
Step 2: reinforce the basis 1 of existing framed building and the post 10 between basis 1 and upper frame bottom girder 6, the upper of layout design construction shock isolating pedestal 2 is pressed around described post 10, lower bracket 4, 3, wherein, on every root post 10, lower bracket 4, between 3, same level position arranges 2 shock isolating pedestals 2, comprise a neoprene bearing and a friction slipper, these shock isolating pedestals 2 are parallel with one another, and arrange along framework bottom girder 6 direction in "-" type, thus form Parallel Isolation bearing, on, lower bracket 4, the magnitude setting of 3 and setting position should be corresponding with the quantity of shock isolating pedestal 2 and position, on, lower bracket 4, 3 constructions should be laid to arrange with shock isolating pedestal 2 and be carried out simultaneously, and during construction, the whole process protection to shock isolating pedestal 2 should be noted, prevent shock isolating pedestal 2 by Concrete contamination, its concrete steps are:
(1): lower bracket 3 reinforcing bar and installation form are reinforced in colligation, at lower bracket 3 reinforcing bar top, shock isolating pedestal lower support plate is set, and shock isolating pedestal 2 is laid by bottom pad plate and bolt sleeve 5 be fixed in lower bracket 3 reinforcing bar and lower support plate, after calibrating the planeness of shock isolating pedestal 2, verticality and horizontal level deviation, bracket 3 concrete under overall perfusion;
(2): shock isolating pedestal 2 upper padding plate and bolt sleeve 5 are installed, on upper padding plate, bracket 4 reinforcing bar and installation form are reinforced in colligation, and upper bracket plate is set bottom upper bracket 4 reinforcing bar, shock isolating pedestal 2 is fixedly installed on upper bracket 4 reinforcing bar and upper bracket plate by upper padding plate and bolt sleeve 5, after all in place, bracket 4 concrete on overall perfusion, during perfusion, should ensure not stay gap between shock isolating pedestal 2 and upper bracket 4, prevent vertical displacement from exceeding standard;
Step 3: reach after design strength until concrete, cuts off the post 10 between upper and lower bracket 4,3, load on post is directly passed to shock isolating pedestal 2, then passes to lower prop and basis 1, thus forms framework Seismic Isolation of Isolation Layer; Displacement structure, distortion complete monitoring and record should be carried out when cutting post 10, adopt quincunx interval to cut off construction when cutting off post 10, allow load transfer progressively complete, ensure smooth transition and the structural safety of load; Cut off post 10 and adopt the concrete cutting machine process of chopping;
Step 4: after having constructed, according to drawing requirement, carries out anticorrosion flameproof protection to shock isolating pedestal 2, and selecting of protective material does not hinder structure along the displacement of Seismic Isolation of Isolation Layer horizontal direction and vertical displacement;
Step 5: by enclosed beam 8, the plate 7 of drawing construction framework Seismic Isolation of Isolation Layer upper end, meanwhile, reserves access path and reserved maintenance according to drawing, changes manhole, ensures the inspection of Seismic Isolation of Isolation Layer, component maintenance and changes.
Embodiment 2
As shown in Figure 4, the installation support and change method that a kind of existing framed building of the present invention adopts Parallel Isolation bearing to reinforce, wherein between every upper and lower bracket 4,3 of root post 10, same level position arranges 3 shock isolating pedestals 2, comprise two neoprene bearings and a friction slipper, these shock isolating pedestals 2 are parallel with one another, and are that T-shape is arranged along framework bottom girder 6 direction.Other step, with embodiment 1, no longer describes in detail herein.
Embodiment 3
As seen in figs. 5-6, the installation support and change method that a kind of existing framed building of the present invention adopts Parallel Isolation bearing to reinforce, wherein between every upper and lower bracket 4,3 of root post 10, same level position arranges 4 shock isolating pedestals 2, comprise two neoprene bearings and two friction slippers, these shock isolating pedestals 2 are parallel with one another, and arrange along framework bottom girder 6 direction in "+" type.Other step, with embodiment 1, no longer describes in detail herein.
Be more than several exemplary embodiments of the present invention, enforcement of the present invention is not limited thereto.
Claims (1)
1. existing framed building adopts the installation support and change method that Parallel Isolation bearing is reinforced, and it is characterized in that: comprise the steps:
Step one: carry out base isolation Parallel Isolation reinforcing design according to existing framed building, and the shock isolating pedestal layout plan of foundation Parallel Isolation reinforcing design, shock isolating pedestal combining form, shock isolating pedestal kind, shock isolating pedestal size and parameters combination verification shock isolating pedestal;
Step 2: reinforce the basis of existing framed building and the post between basis and upper frame bottom girder, the upper of layout design construction shock isolating pedestal is pressed around described post, lower bracket, wherein, on every root post, between lower bracket, same level position arranges 2 ~ 4 shock isolating pedestals, comprise at least one neoprene bearing and at least one friction slipper, these shock isolating pedestals are parallel with one another, and along framework bottom girder direction in "-" type, T-shape or "+" type are arranged, thus form Parallel Isolation bearing, on, the magnitude setting of lower bracket and setting position should be corresponding with the quantity of shock isolating pedestal and position, on, lower bracket construction should be laid to arrange with shock isolating pedestal and be carried out simultaneously, its concrete steps are:
(1): lower bracket reinforcing bar and installation form are reinforced in colligation, at lower bracket reinforcing bar top, shock isolating pedestal lower support plate is set, and shock isolating pedestal is laid by bottom pad plate and bolt sleeve be fixed in lower bracket reinforcing bar and lower support plate, after calibrating the planeness of shock isolating pedestal, verticality and horizontal level deviation, bracket concrete under overall perfusion;
(2): shock isolating pedestal upper padding plate and bolt sleeve are installed, on upper padding plate, bracket reinforcing bar and installation form are reinforced in colligation, and upper bracket plate is set bottom upper bracket reinforcing bar, shock isolating pedestal is fixedly installed on upper bracket reinforcing bar and upper bracket plate by upper padding plate and bolt sleeve, after all in place, bracket concrete on overall perfusion, during perfusion, should ensure not stay gap between shock isolating pedestal and upper bracket, prevent vertical displacement from exceeding standard;
During step 2 construction, the whole process protection to shock isolating pedestal should be noted, prevent shock isolating pedestal by Concrete contamination;
Step 3: reach after design strength until concrete, adopt boring to add the pneumatic pick manual process of chopping, the concrete cutting machine process of chopping, the hydraulic splitting machine process of chopping or nuisanceless static blasting method and cut off post between upper and lower bracket, load on post is directly passed to shock isolating pedestal, pass to lower prop and basis again, thus form framework Seismic Isolation of Isolation Layer; Should carry out displacement structure, distortion complete monitoring and record when cutting post, cut off post and specifically adopt quincunx interval to cut off construction, interleaved segmentation is carried out, and allows load transfer progressively complete, and ensures smooth transition and the structural safety of load;
Step 4: after having constructed, according to drawing requirement, carries out anticorrosion flameproof protection to shock isolating pedestal, and the material selected by anticorrosion flameproof protection must not hinder structure along the displacement of Seismic Isolation of Isolation Layer horizontal direction and vertical displacement;
Step 5: by enclosed beam, the plate of drawing construction framework Seismic Isolation of Isolation Layer upper end, meanwhile, reserves access path and reserved maintenance according to drawing, changes manhole, ensures the inspection of Seismic Isolation of Isolation Layer, component maintenance and changes.
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| CN102767238B (en) * | 2012-07-27 | 2015-04-22 | 中铁十六局集团有限公司 | Construction method of shock-isolation rubber support |
| CN102864943B (en) * | 2012-10-11 | 2016-08-03 | 北京筑福国际工程技术有限责任公司 | Shock isolating pedestal brick is mixed fixing structure and installs support and change method |
| CN103075024B (en) * | 2012-11-09 | 2015-04-15 | 河南省建设集团有限公司 | Space truss underpinning structure with combination of steel and prestressed concrete and construction method thereof |
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| CN103741832B (en) * | 2014-01-26 | 2016-03-16 | 昆明天矫力加固技术工程有限公司 | A kind of building truncated cylinder displacement shock isolating pedestal construction method and bracing or strutting arrangement |
| CN105332460A (en) * | 2015-10-19 | 2016-02-17 | 长沙新气象自动化技术有限公司 | Environment-friendly seismic-isolation building block |
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| CN106869569B (en) * | 2017-04-09 | 2019-04-30 | 北京工业大学 | A kind of core-added laminated column improving underground frame structure system anti-seismic performance |
| CN107724559B (en) * | 2017-10-23 | 2019-07-05 | 南京百西思建筑科技有限公司 | Existing building base isolation reinforcement construction process |
| CN107795144A (en) * | 2017-10-23 | 2018-03-13 | 南京百西思建筑科技有限公司 | The underpinning structure and underpinning construction method of existing building base isolation reinforcement |
| CN109594833B (en) * | 2018-11-28 | 2020-09-08 | 浙江理工大学 | Interlayer shock insulation method for prefabricated concrete structure |
| CN109930854A (en) * | 2019-03-12 | 2019-06-25 | 北京筑福建筑科学研究院有限责任公司 | A kind of toughness building structure and its construction method that existing frame structure uses shock insulation to underpin |
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