CN106401208A - Superimposed reinforcement structure and method for additionally arranging column grid on existing long-span structure - Google Patents
Superimposed reinforcement structure and method for additionally arranging column grid on existing long-span structure Download PDFInfo
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- CN106401208A CN106401208A CN201610894428.4A CN201610894428A CN106401208A CN 106401208 A CN106401208 A CN 106401208A CN 201610894428 A CN201610894428 A CN 201610894428A CN 106401208 A CN106401208 A CN 106401208A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0266—Enlarging
Abstract
The invention belongs to the field of constructional engineering and particularly relates to a superimposed reinforcement structure for additionally arranging a column grid on an existing long-span structure. The superimposed reinforcement structure comprises existing structure columns and an existing long-span structure beam which is supported on the existing structure columns. An additional beam superimposed layer is arranged on the existing long-span structure beam, profile steel is arranged inside the additional beam superimposed layer, and the existing long-span structure beam and the additional beam superimposed layer are provided with shear-resistant connection steel bars and junction surface constructional steel bars in the position of an old and new concrete junction surface. By means of the superimposed reinforcement structure, components of the existing structure do not need to be dismantled, the damage to the existing structure is small, and normal functional application of an existing building does not need to be interrupted; the characteristic that the existing structure possesses certain bearing capacity is fully utilized, and temporary construction safety supporting measures are not needed, so that the construction cost is reduced and the construction efficiency is improved; and the shear-resistant bearing capacity of the superimposed structure in the position of the junction surface is guaranteed, and finally, the overall anti-bending bearing capacity of the superimposed structure is guaranteed.
Description
Technical field
A kind of the invention belongs to building engineering field, in particular it relates to overlapping of post net newly-increased on existing large-span structure
Reinforcement means.
Background technology
Required according to current urban planning management, implement city in order and repair and Organic Renewal, Continuity ofhistory literary composition
Arteries and veins, one-tenth is attached most importance to.At present, in a lot of cities generally existing, some due to bankroll problem or are unable to meeting the market requirement and make
Become " incomplete or delayed projects " stopped work, and the transformation of similar engineering and redesign, to vitalizing shut-down project, improving that city image has very much must
Will.Meanwhile, in urbanization process afterwards, the Testing and appraisal of existing building and strengthening reconstruction will put on important schedule.
However, in existing strengthening reconstruction technology, generally existing some such as reinforce after useful life longevity, strengthening construction
During because component removes the provisional measure potential safety hazard causing not in place, reinforce after anti-seismic performance the problems such as reduce.
Content of the invention
For the defect overcoming prior art to exist, a kind of overlapping of post net newly-increased on existing large-span structure of present invention offer
Reinforcement means, the function of need not interrupting existing building uses, and can largely improve the bearing capacity of structure after transformation,
Also have the advantages that construction quality is high and construction cost is low.
For achieving the above object, the present invention employs the following technical solutions：
The overlapping ruggedized construction of newly-increased post net on existing large-span structure, including：Existing structure post, existing large-span structure beam,
Existing it is supported on existing structure post across bearing beam greatly；Wherein：Existing big setting on bearing beam increases beam overlapping layers, newly-increased beam newly
Setting shaped steel in overlapping layers, existing big arranges shear connections across bearing beam and newly-increased beam overlapping layers at New-old concrete interface
Reinforcing bar and Interface Construction reinforcing bar.
Preferably, the interior setting of newly-increased beam overlapping layers newly-increased beam overlapping layers outer ring closed stirrup, the internal U of newly-increased beam overlapping layers
U stirrup, newly-increased beam overlapping layers bottom muscle, newly-increased beam overlapping layers top muscle and newly-increased beam overlapping layers waist muscle, in wherein newly-increased overlapping layers
The internal inverted U-shaped stirrup of the inverted U-shaped stirrup in portion and shear connections reinforcement welding, newly-increased overlapping layers outer ring closed stirrup and newly-increased overlapping layers
Gross sectional area can not be less than existing large-span structure beam stirrup gross sectional area.
Preferably, the position setting capital that newly-increased beam overlapping layers is located on existing structure post connects overlapping layers, existing structure
Post, existing structure plate are connected overlapping layers with capital to be had by arranging capital overlapping layers and bottom post at New-old concrete interface
Effect connects reinforcing bar and capital overlapping layers bottom resistant slide reinforcing bar is reliably connected.
Preferably, capital connects setting bonding pad compound stirrup in overlapping layers, and bonding pad compound stirrup is arranged in capital and folds
Close layer and bottom post effectively connection reinforcing bar length range, spacing≤100mm and meet styletable stirrup antidetonation security requirements.
Preferably, capital connects the horizontal hoop of setting in overlapping layers, horizontal hoop, longitudinal hoop.
Preferably, newly-increased beam overlapping layers is arranged newly-increased pillar, the bottom that muscle stretches into newly-increased beam overlapping layers indulged by newly-increased pillar,
And rectangular closed hoop is set, muscle indulged by the fixing newly-increased pillar of operative constraint.
Preferably, newly-increased beam overlapping layers orthogonal direction arranges connection beam, and connection beam bottom setting styrofoam replaces template.
Preferably, when described New-old concrete interface is processed, should need to take respective handling method according to using, and full
The process quality requirement that foot design proposes.
Preferably, the shear connections reinforcing bar of setting and Interface Construction reinforcing bar at described New-old concrete interface, should basis
Carry out calculating using needs and determine.
On above-mentioned existing large-span structure, the construction method of the overlapping ruggedized construction of newly-increased post net, comprises the following steps：
(1), overall structure overlapping Design of Reinforcement
(1), according to force request, calculate and determine composite beam global sections height, existing large-span structure beam will be ensured simultaneously
Stirrup and existing large-span structure beam bottom muscle meet calculating and require, and need not carry out reinforcement process；
(2), determine the area of section of shear connections reinforcing bar according to Force Calculation, not less than existing large-span structure beam stirrup
Area of section；
(3), capital overlapping layers and the area of section of bottom post effectively connection reinforcing bar are determined according to Force Calculation, wherein should not
Indulge muscle less than beam-ends capital and calculate area of section；
(4), determine the area of section of newly-increased beam overlapping layers top muscle according to Force Calculation, and determined according to stress size newly-increased
The length of beam overlapping layers extension；
(5), increase overlapping layers outer ring closed stirrup newly and the total cross-sectional area of the internal inverted U-shaped stirrup of newly-increased overlapping layers can not be little
Total cross-sectional area in existing large-span structure beam stirrup；
(6), increase beam overlapping layers bottom muscle newly and need to meet newly-increased beam and overlap the stress of layer cross section and indulge muscle minimum steel ratio and require, newly
Increase beam overlapping layers waist muscle and need to meet specification detailing requiments；
(7), according to capital shear force calculation result, determine that capital connects the planar dimension of overlapping layers；
(2), ensure New-old concrete cooperation
(1), New-old concrete interface is processed：Using artificial chiseling method or high pressure water jet method, remove original concrete and dredge
Pine, damaged and surface carbonation layer, form the matsurface that concavo-convex difference is not less than 6mm；
(2), implant interface distributing bar on the existing structure plate in newly-increased beam overlapping layers region outside existing large-span structure beam；
(3), connect in the outer capital of existing structure post and capital overlapping layers bottom is planted on the existing structure plate in overlapping layers region
Resistant slide reinforcing bar；
(3), increase beam overlapping layers connection newly to process
(1), the existing large-span structure beam of shear connections reinforcing bar implantation meets not less than 15 times of diametric requirements；
(2), Interface Construction reinforcing bar implantation existing structure plate meets not less than 10 times of diametric requirements；
(3), increase the internal inverted U-shaped stirrup of beam overlapping layers newly and shear connections reinforcing bar is welded；
(4), the elongated needs in rear antidetonation encrypted area are increased according to existing large-span structure beam, construct in newly-increased overlapping layers and set
Put shaped steel, increase the anti-earthquake ductility of overall iterative structure；
(4), capital connects overlapping layers connection and processes
(1), capital overlapping layers and bottom post effectively connection reinforcing bar implantation existing structure post meet bar planting anti-drag anchoring depth
Design requirement；
(2), capital overlapping layers bottom resistant slide reinforcing bar implantation existing structure plate meets not less than 10 times of diametric requirements；
(3), calculated according to beam-ends capital and require, connect setting bonding pad compound stirrup in overlapping layers in capital, improve even
The core space shear resistance of socket part position；
(4), according to calculating force analysis and detailing requiments, connect in overlapping layers in capital and horizontal hoop, lateral loops are set
Hoop, longitudinal hoop, improve the overall anti-twisting property that capital connects overlapping layers；
(5), increase bottom of the pillar connection newly to process
(1), increase pillar newly and indulge the bottom that muscle stretches into newly-increased beam overlapping layers, and rectangular closed hoop is set, operative constraint is fixed
Muscle indulged by newly-increased pillar；
(2) it is, to avoid overlapping layers to bear excessive moment of torsion effect, connection beam, the section of connection beam are set in orthogonal direction
Arrangement of reinforcement determines according to post bottom calculation of Bending Moment, and meanwhile, for ensureing independent stressed and the easy construction of connection beam, beam bottom arranges polyphenyl
Plate replaces template, and is separated with existing structure plate；
(6), concrete construction is special requires
(1), after the completion of work of knocking off to be tested, carry out model sheetinstallat work, formwork elevation measuring, position, size should closely conform to set
Meter requires, and supports and template is fixing reliable, formwork edge joint is tight；
(2), casting concrete, vibrates, maintenance.
Compared with prior art, the present invention has the advantages that：
1st, component dismounting need not be carried out to existing structure, existing structure be damaged few, and existing building need not be interrupted
Normal function uses；
2nd, make full use of the feature that existing structure possesses certain bearing capacity, provisional construction safety need not be carried out and support
Measure, not only reduces construction cost, also improves efficiency of construction；
3rd, pass through setting shear connections reinforcing bar at New-old concrete interface it is ensured that iterative structure is anti-at interface
Cut bearing capacity, the final overall anti-bending bearing capacity ensureing iterative structure；
4th, pass through to arrange shaped steel in newly-increased overlapping layers, to improve the shear resistance of overall iterative structure, increase overlapping knot
The anti-earthquake ductility of structure, increases the elongated needs in rear antidetonation encrypted area to meet large-span structure beam section；
5th, pass through to arrange capital overlapping layers and bottom post effectively connection reinforcing bar it is ensured that iterative structure is in capital join domain
Anti-bending bearing capacity, by arranging capital bonding pad compound stirrup, improve the core space shear resistance of capital connecting portion；
6th, processed by New-old concrete interface, and newly-increased beam overlapping layers Interface Construction reinforcing bar and capital overlapping layers are set
Bottom resistant slide reinforcing bar is it is ensured that the level of significance power transmission capacity of iterative structure.
Brief description
Fig. 1 is the overall structure plan of the overlapping ruggedized construction of newly-increased post net on existing large-span structure；
Fig. 2 is the overall structure elevation of the overlapping ruggedized construction of newly-increased post net on existing large-span structure；
Fig. 3 is composite beam sectional detail drawing；
Fig. 4 is that capital connects plane detail drawing；
Fig. 5 is that capital connects sectional detail drawing；
In figure：1st, existing structure post, 2, existing large-span structure beam, 3, newly-increased beam overlapping layers, 4, shaped steel, 5, capital connect folded
Close layer, 6, newly-increased pillar, 7, connection beam, 8, existing structure plate, 9, existing large-span structure beam stirrup, 10, existing large-span structure beam
Bottom muscle, 11, existing large-span structure back muscle, 12, New-old concrete interface, 13, shear connections reinforcing bar, 14, Interface Construction steel
Muscle, 15, newly-increased overlapping layers outer ring closed stirrup, 16, the internal inverted U-shaped stirrup of newly-increased overlapping layers, 17, newly-increased beam overlapping layers bottom muscle,
18th, increase beam overlapping layers top muscle newly, 19, newly-increased beam overlapping layers waist muscle, 20, shaped steel, 21, newly-increased pillar indulge muscle, 22, rectangular closed
Hoop, 23, styrofoam, 24, capital overlapping layers and bottom post effectively connection reinforcing bar, 25, capital overlapping layers bottom resistant slide reinforcing bar,
26th, bonding pad compound stirrup, 27, horizontal hoop, 28, horizontal hoop, 29, longitudinal hoop.
Specific embodiment
As shown in Figures 1 to 5, existing large-span structure increases the overlapping ruggedized construction of post net newly, including：Existing structure post 1,
Existing large-span structure beam 2, existing is supported on existing structure post 1 across bearing beam 2 greatly；Existing big setting on bearing beam 2 increases newly
Beam overlapping layers 3, to increase beam effective cross-section height；Setting shaped steel 20 in newly-increased beam overlapping layers 3, to improve overall iterative structure
Shear resistance, increases the anti-earthquake ductility of iterative structure, meets and increases the elongated needs in rear antidetonation encrypted area across bearing beam greatly；Existing
Greatly shear connections reinforcing bar 13 and Interface Construction are set at New-old concrete interface 12 across bearing beam 2 and newly-increased beam overlapping layers 3
Reinforcing bar 14, to carry out effectively connection.
Setting newly-increased beam overlapping layers outer ring closed stirrup 15, the internal inverted U-shaped hoop of newly-increased beam overlapping layers in newly-increased beam overlapping layers 3
Muscle 16, newly-increased beam overlapping layers bottom muscle 17, newly-increased beam overlapping layers top muscle 18 and newly-increased beam overlapping layers waist muscle 19, wherein newly-increased overlapping
The internal inverted U-shaped stirrup 16 of layer is welded with shear connections reinforcing bar 13, in newly-increased overlapping layers outer ring closed stirrup 15 and newly-increased overlapping layers
The gross sectional area of the inverted U-shaped stirrup in portion 16 can not be less than the gross sectional area of existing large-span structure beam stirrup 9.
The position setting capital connection overlapping layers 5 that newly-increased beam overlapping layers 3 is located on existing structure post 1, existing structure post 1,
Existing structure plate 8 is connected overlapping layers 5 with capital to be passed through to arrange capital overlapping layers and bottom post at New-old concrete interface 12
Effectively connection reinforcing bar 24 and capital overlapping layers bottom resistant slide reinforcing bar 25 are reliably connected.
Capital connects setting bonding pad compound stirrup 26 in overlapping layers 5, and bonding pad compound stirrup 26 is arranged in capital overlapping
Layer and bottom post effectively connection reinforcing bar 24 length range, spacing≤100mm and meet styletable stirrup antidetonation security requirements, purpose is
Improve the core space shear resistance of capital connecting portion, increase the anti-earthquake ductility of capital connecting portion, thus improve overlapping reinforcing
The overall shock resistance of structure.
Capital connects the horizontal hoop 27 of setting in overlapping layers 5, horizontal hoop 28, longitudinal hoop 29, to improve capital connection
The anti-twisting property of overlapping layers 5.
Newly-increased pillar 6 is arranged on newly-increased beam overlapping layers 3, newly-increased pillar 6 can be arranged using needs according to top-out,
There is larger freedom.The bottom that muscle 21 stretches into newly-increased beam overlapping layers 3 indulged by newly-increased pillar, and arranges rectangular closed hoop 22, has
Muscle 21 indulged by the fixing newly-increased pillar of effect constraint.
Newly-increased beam overlapping layers 3 orthogonal direction arranges connection beam 7, to avoid overlapping layers to bear excessive moment of torsion effect.Contact
Beam 7 bottom setting styrofoam 23 replaces template, to ensure independent stressed and the easy construction of connection beam 7.
When described New-old concrete interface is processed, should need to take respective handling method according to using, and meet design
The process quality requirement proposing.
The shear connections reinforcing bar of setting and Interface Construction reinforcing bar at described New-old concrete interface, should be according to using needs
Carry out calculating and determine.
On above-mentioned existing large-span structure, the construction method of the overlapping ruggedized construction of newly-increased post net, comprises the following steps：
(1), overall structure overlapping Design of Reinforcement
(1), according to force request, calculate and determine composite beam global sections height, existing large-span structure beam will be ensured simultaneously
Stirrup 9 and existing large-span structure beam bottom muscle 10 meet calculating and require, and need not carry out reinforcement process；
(2), determine the area of section of shear connections reinforcing bar 13 according to Force Calculation, not less than existing large-span structure beam hoop
The area of section of muscle 9；
(3), capital overlapping layers and the area of section of bottom post effectively connection reinforcing bar 24 are determined according to Force Calculation, wherein should
Indulge muscle not less than beam-ends capital and calculate area of section；
(4), determine the area of section of newly-increased beam overlapping layers top muscle 18 according to Force Calculation, and determined according to stress size new
Increase the length of beam overlapping layers extension 4；
(5), increase the total cross-sectional area of the inverted U-shaped stirrup 16 of overlapping layers outer ring closed stirrup 15 and newly-increased overlapping layers inside newly not
Can be less than the total cross-sectional area of existing large-span structure beam stirrup 9；
(6), increase newly beam overlapping layers bottom muscle 17 need to meet newly-increased beam overlapping layers 3 section stress indulge muscle minimum steel ratio will
Ask, newly-increased beam overlapping layers waist muscle 19 need to meet specification detailing requiments.
(7), according to capital shear force calculation result, determine that capital connects the planar dimension of overlapping layers 5.
(2), ensure New-old concrete cooperation
(1), New-old concrete interface is processed：Using artificial chiseling method or high pressure water jet method, remove original concrete and dredge
Pine, damaged and surface carbonation layer, form the matsurface that concavo-convex difference is not less than 6mm；
(2), implant interface construction steel on the existing structure plate 8 in outer newly-increased beam overlapping layers 3 region of existing large-span structure beam 2
Muscle 14；
(3) plant capital overlapping layers bottom on the existing structure plate 8, connecting overlapping layers 5 region in the outer capital of existing structure post 1
Portion's resistant slide reinforcing bar 15.
(3), increase beam overlapping layers connection newly to process
(1), shear connections reinforcing bar 13 is implanted existing large-span structure beam 2 and is met not less than 15 times of diametric requirements；
(2), Interface Construction reinforcing bar 14 implantation existing structure plate 8 meets not less than 10 times of diametric requirements；
(3), increase the internal inverted U-shaped stirrup 16 of beam overlapping layers newly to be welded with shear connections reinforcing bar 13；
(4), the elongated needs in rear antidetonation encrypted area are increased according to existing large-span structure beam, construct in newly-increased overlapping layers and set
Put shaped steel 20, increase the anti-earthquake ductility of overall iterative structure.
(4), capital connects overlapping layers connection and processes
(1), capital overlapping layers and bottom post effectively connection reinforcing bar 24 implantation existing structure post 1 meet bar planting anti-drag anchoring deeply
Degree design requirement；
(2), capital overlapping layers bottom resistant slide reinforcing bar 25 implantation existing structure plate 8 meets not less than 10 times of diametric requirements；
(3), calculated according to beam-ends capital and require, connect setting bonding pad compound stirrup 26 in overlapping layers 5 in capital, improve
The core space shear resistance of connecting portion；
(4), according to calculating force analysis and detailing requiments, connect in capital and horizontal hoop 27, horizontal is set in overlapping layers 5
Hoop 28, longitudinal hoop 29, improve the overall anti-twisting property that capital connects overlapping layers 5；
(5), increase bottom of the pillar connection newly to process
(1), increase pillar newly and indulge the bottom that muscle 21 stretches into newly-increased beam overlapping layers 3, and rectangular closed hoop 22, operative constraint are set
Muscle 21 indulged by fixing newly-increased pillar；
(2) it is, to avoid overlapping layers to bear excessive moment of torsion effect, connection beam 7, the section of connection beam are set in orthogonal direction
Arrangement of reinforcement determines according to post bottom calculation of Bending Moment, and meanwhile, for ensureing independent stressed and the easy construction of connection beam, beam bottom arranges polyphenyl
Plate 23 replaces template, and wants to depart from existing structure plate 8.
(6), concrete construction is special requires
(1), after the completion of work of knocking off to be tested, carry out model sheetinstallat work, formwork elevation measuring, position, size should closely conform to set
Meter requires, and supports and template is fixing reliable, formwork edge joint is tight；
(2), casting concrete, answers continuous placing one-shot forming, such as must interval, the intermittent time tries one's best and shortens, and under
Before layer concrete initial set, upper strata concreting is finished；When vibrating, vibrating head collision slab should be avoided, such as template, support are sent out
Stop immediately pouring during the shape that changes displacement, and it is intact to rest and reorganize before the concrete coagulation having poured.Concreting finishes treats end
Maintenance of sprinkling water should be started when solidifying, specifically can comprehensive according to situations such as slump, temperature determine.
Strengthening reconstruction is carried out to existing structure using the method, existing structure can be made full use of and possess certain bearing capacity
Feature, need not carry out provisional construction safety strutting means, not only reduce construction cost, also improve efficiency of construction；Right
Existing structure damages less, and need not interrupt the normal usage function of existing building；After transformation, structural-load-carrying capacity lifting effect is bright
Aobvious, and can meet using safety, durability and anti-earthquake ductility requirement, applied widely.
Claims (10)
1. the overlapping ruggedized construction of post net is increased newly on a kind of existing large-span structure, including：Existing structure post, existing large-span structure
Beam, existing is supported on existing structure post across bearing beam greatly；It is characterized in that：Existing big setting on bearing beam increases beam overlapping newly
Layer, setting shaped steel in newly-increased beam overlapping layers, existing set at New-old concrete interface with newly-increased beam overlapping layers across bearing beam greatly
Put shear connections reinforcing bar and Interface Construction reinforcing bar.
2. on existing large-span structure according to claim 1 newly-increased post net overlapping ruggedized construction it is characterised in that：Newly-increased
Setting newly-increased beam overlapping layers outer ring closed stirrup, the internal inverted U-shaped stirrup of newly-increased beam overlapping layers, newly-increased beam overlapping layers in beam overlapping layers
Bottom muscle, newly-increased beam overlapping layers top muscle and newly-increased beam overlapping layers waist muscle, wherein increase the internal inverted U-shaped stirrup of overlapping layers newly with shearing resistance even
Connect reinforcement welding, the gross sectional area of newly-increased overlapping layers outer ring closed stirrup and the internal inverted U-shaped stirrup of newly-increased overlapping layers can not be little
Gross sectional area in existing large-span structure beam stirrup.
3. on the existing large-span structure according to claim 1-2 newly-increased post net overlapping ruggedized construction it is characterised in that：Newly
Increase the position setting capital connection overlapping layers that beam overlapping layers is located on existing structure post, existing structure post, existing structure plate and post
Top connects overlapping layers and passes through to arrange capital overlapping layers and bottom post effectively connection reinforcing bar and capital at New-old concrete interface
Overlapping layers bottom resistant slide reinforcing bar is reliably connected.
4. on the existing large-span structure according to claim 1-3 newly-increased post net overlapping ruggedized construction it is characterised in that：Post
Top connects setting bonding pad compound stirrup in overlapping layers, and bonding pad compound stirrup is arranged in capital overlapping layers and is effectively connected with bottom post
Connect reinforcing bar length range, spacing≤100mm and meet styletable stirrup antidetonation security requirements.
5. on the existing large-span structure according to claim 1-4 newly-increased post net overlapping ruggedized construction it is characterised in that：Post
Top connects the horizontal hoop of setting in overlapping layers, horizontal hoop, longitudinal hoop.
6. on the existing large-span structure according to claim 1-5 newly-increased post net overlapping ruggedized construction it is characterised in that：Newly
Increase the newly-increased pillar of setting on beam overlapping layers, the bottom that muscle stretches into newly-increased beam overlapping layers indulged by newly-increased pillar, and arranges rectangular closed hoop,
Muscle indulged by the fixing newly-increased pillar of operative constraint.
7. on the existing large-span structure according to claim 1-6 newly-increased post net overlapping ruggedized construction it is characterised in that：Newly
Increase beam overlapping layers orthogonal direction setting connection beam, connection beam bottom setting styrofoam replaces template.
8. on the existing large-span structure according to claim 1-7 newly-increased post net overlapping ruggedized construction it is characterised in that：Institute
When stating the process of New-old concrete interface, should need to take respective handling method according to using, and meet the process that design proposes
Quality requirement.
9. on the existing large-span structure according to claim 1-8 newly-increased post net overlapping ruggedized construction it is characterised in that：Institute
State the shear connections reinforcing bar of setting and Interface Construction reinforcing bar at New-old concrete interface, should carry out calculating really according to using needs
Fixed.
10. the construction method of the overlapping ruggedized construction of post net, its feature are increased newly on the existing large-span structure described in claim 1-9
It is, comprise the following steps：
(1), overall structure overlapping Design of Reinforcement
(1), according to force request, calculate and determine composite beam global sections height, existing large-span structure beam stirrup will be ensured simultaneously
Meet to calculate with existing large-span structure beam bottom muscle and require, and reinforcement process need not be carried out；
(2), determine the area of section of shear connections reinforcing bar according to Force Calculation, the cutting of not less than existing large-span structure beam stirrup
Face area；
(3), capital overlapping layers and the area of section of bottom post effectively connection reinforcing bar are determined according to Force Calculation, wherein should be not less than
Beam-ends capital is indulged muscle and is calculated area of section；
(4), determine the area of section of newly-increased beam overlapping layers top muscle according to Force Calculation, and determine that newly-increased beam is folded according to stress size
Close the length of layer extension；
(5), increase overlapping layers outer ring closed stirrup newly and the total cross-sectional area of the internal inverted U-shaped stirrup of newly-increased overlapping layers can not be less than both
There is the total cross-sectional area of large-span structure beam stirrup；
(6), increase beam overlapping layers bottom muscle newly and need to meet newly-increased beam and overlap the stress of layer cross section and indulge muscle minimum steel ratio and require, newly-increased beam
Overlapping layers waist muscle need to meet specification detailing requiments；
(7), according to capital shear force calculation result, determine that capital connects the planar dimension of overlapping layers；
(2), ensure New-old concrete cooperation
(1), New-old concrete interface is processed：Using artificial chiseling method or high pressure water jet method, remove original loose concrete, break
Undermine surface carbonation layer, form the matsurface that concavo-convex difference is not less than 6mm；
(2), implant interface distributing bar on the existing structure plate in newly-increased beam overlapping layers region outside existing large-span structure beam；
(3), connect in the outer capital of existing structure post and the bottom antiskid of capital overlapping layers is planted on the existing structure plate in overlapping layers region
Move reinforcing bar；
(3), increase beam overlapping layers connection newly to process
(1), the existing large-span structure beam of shear connections reinforcing bar implantation meets not less than 15 times of diametric requirements；
(2), Interface Construction reinforcing bar implantation existing structure plate meets not less than 10 times of diametric requirements；
(3), increase the internal inverted U-shaped stirrup of beam overlapping layers newly and shear connections reinforcing bar is welded；
(4), the elongated needs in rear antidetonation encrypted area are increased according to existing large-span structure beam, construct setting type in newly-increased overlapping layers
Steel, increases the anti-earthquake ductility of overall iterative structure；
(4), capital connects overlapping layers connection and processes
(1), capital overlapping layers and bottom post effectively connection reinforcing bar implantation existing structure post meet bar planting anti-drag anchoring depth design
Require；
(2), capital overlapping layers bottom resistant slide reinforcing bar implantation existing structure plate meets not less than 10 times of diametric requirements；
(3), calculated according to beam-ends capital and require, connect setting bonding pad compound stirrup in overlapping layers in capital, improve connecting portion
The core space shear resistance of position；
(4), according to calculating force analysis and detailing requiments, connect in capital and horizontal hoop, horizontal hoop are set in overlapping layers, indulge
To hoop, improve the overall anti-twisting property that capital connects overlapping layers；
(5), increase bottom of the pillar connection newly to process
(1), increase pillar newly and indulge the bottom that muscle stretches into newly-increased beam overlapping layers, and rectangular closed hoop is set, operative constraint is fixing newly-increased
Muscle indulged by pillar；
(2) it is, to avoid overlapping layers to bear excessive moment of torsion effect, connection beam, the sectional reinforcement of connection beam are set in orthogonal direction
Determined according to post bottom calculation of Bending Moment, meanwhile, for ensureing independent stressed and the easy construction of connection beam, beam bottom arranges styrofoam generation
For template, and it is separated with existing structure plate；
(6), concrete construction is special requires
(1), after the completion of work of knocking off to be tested, carry out model sheetinstallat work, formwork elevation measuring, position, size should closely conform to design and want
Ask, support and template is fixing reliable, formwork edge joint is tight；
(2), casting concrete, vibrates, maintenance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610894428.4A CN106401208B (en) | 2016-10-13 | 2016-10-13 | Increase the construction method of the overlapping ruggedized construction of post net on a kind of existing large-span structure newly |
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| CN201610894428.4A CN106401208B (en) | 2016-10-13 | 2016-10-13 | Increase the construction method of the overlapping ruggedized construction of post net on a kind of existing large-span structure newly |
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| EP3040496A1 (en) * | 2014-12-31 | 2016-07-06 | Fortress Stabilization Systems | Structure reinforcement system and method |
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| CN108678033A (en) * | 2018-08-06 | 2018-10-19 | 浙江绿城建筑设计有限公司 | Resistance to plucking steel tube pile structure and its construction method are augmented on existing structure sole plate |
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