CN104032892B - A kind of regeneration concrete segmentation beam and construction method thereof - Google Patents
A kind of regeneration concrete segmentation beam and construction method thereof Download PDFInfo
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Abstract
The invention provides a kind of regeneration concrete segmentation beam construction method, segmentation beam is divided into be dominant section and two shearings of a moment of flexure to be dominant section, two shearings section that is dominant lays respectively at moment of flexure and to be dominant the both sides of section, adopts cast-in-place, the half prefabricated half cast-in-place or half cast-in-place mode that partly reclaims again regeneration concrete segmentation beam sectional to be built.The construction method that the present invention adopts; use regeneration concrete as raw material; reduce structural element cost; promote the development of green building and search out a reliable and approach for large-scale recovery recycling for concrete dead meal; simple, the easy construction of this construction method simultaneously; accelerate construction speed while ensureing workmanship, shorten construction period.And the regeneration concrete segmentation beam that the construction method that the present invention adopts is built, has good stress performance, structure is simple, reliability is high, have very practical value.
Description
Technical field
The present invention relates to housing construction technical field, particularly relate to a kind of regeneration concrete segmentation beam and construction method thereof.
Background technology
Concrete, as one of maximum engineered composite material of use amount, is widely used in the engineering constructions such as house, water conservancy and municipal administration.It makes cementitious material with cement, sand, masonry aggregate, coordinates by a certain percentage, obtain through stirring with water (can contain Admixture and admixture).In concrete composition, coarse-fine aggregate is concrete chief component, and its source is the natural sandstone of the Nature substantially at present.But natural aggregate in process of production, need to cut into a mountain for quarrying or salvage river sea sand in a large number, serious environmental disruption will inevitably be caused to nature.In order to protection of the environment, development green economy, is necessary discarded concrete cycling and reutilization, and prepares regeneration concrete and be applied in practice of construction.
Regeneration concrete refers to discarded concrete block after broken, cleaning, classification, mix by a certain percentage with grating, partly or entirely the natural aggregate (mainly coarse aggregate) such as replacement sandstone, then adds the concrete that cement, water etc. is mixed with.It is as a kind of Novel environment-friendlymaterial material prepared by discarded concrete, have source wide, green circulatory, cost are low, advantages of environment protection, are also one of most suitable methods processing discarded concrete at present.But also there is the defects such as mechanical property discreteness is large, aggregate occlusion is poor in regeneration concrete, can reduce the reliability of structure, thus be used in non-structural element at present, and use amount is less, cannot obtain widely applying and promoting in practice of construction.
Therefore, if regeneration concrete reliably can be used in the huge structural element of consumption, the application and development of regeneration concrete will greatly be promoted.For discarded concrete searches out a reliable and approach for large-scale recovery recycling, being conducive to the progress promoting green circulatory regeneration industry, is a kind of way very with Practical significance.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of regeneration concrete segmentation beam and construction method thereof, for solving in prior art the structural element lacked application after regeneration concrete and natural concrete segmentation by a certain percentage mixing.
For achieving the above object, the invention provides a kind of regeneration concrete segmentation beam construction method, segmentation beam is divided into be dominant section and two shearings of a moment of flexure to be dominant section, described two shearings section that is dominant lays respectively at moment of flexure and to be dominant the both sides of section, adopts cast-in-place, the half prefabricated half cast-in-place or half cast-in-place mode that partly reclaims again regeneration concrete segmentation beam sectional to be built.
Preferably, reinforcing cage is provided with as skeleton in described segmentation beam.
Further, described reinforcing cage comprises elongated reinforcing bar, bearing additional bar, waist muscle and stirrup.
Further, the form of construction work of described reinforcing cage meets the related request of " 11G101-1 concrete structure construction plan integral drawing method cartographic convention and constructional detail (cast-in-situ concrete framework, shear wall, beam, plate) " and " GB50666-2011 concrete structure engineering job specfication ".
Described regeneration concrete refers to by waste and old concrete after processing, fragmentation, classification, the regeneration aggregate be mixed to form by a certain percentage, partly or entirely replaces the new concrete that natural aggregate is formulated.
Preferably, the regeneration concrete of described different mixture ratio refers to the regeneration concrete that recycled coarse aggregate contents is different.Further, the regeneration concrete when recycled coarse aggregate contents is 0% is natural concrete.
Described regeneration aggregate Replacement rate refers to ratio regeneration aggregate partly or entirely being replaced natural aggregate.Regeneration aggregate Replacement rate is higher, and concrete intensity is lower; Regeneration aggregate Replacement rate is lower, and concrete intensity is higher.
Preferably, in described segmentation beam, moment of flexure section, left side shearing the be dominant clear span length ratio of section of section, right side shearing that is dominant that is dominant is 1:1 ~ 2:1 ~ 2.Further, in described segmentation beam, moment of flexure section, left side shearing the be dominant clear span length ratio of section of section, right side shearing that is dominant that is dominant is 1:1:1.
Preferably, the described moment of flexure section that is dominant is the complete house frame beam that reclaims or adopts the regeneration concrete of recycled coarse aggregate contents > 30% to build.Preferably, the described moment of flexure section that is dominant adopts the regeneration concrete of recycled coarse aggregate contents 100% to build.
Preferably, described shearing is dominant the natural concreting that section adopts the regeneration concrete of recycled coarse aggregate contents≤30% or recycled coarse aggregate contents to equal 0%.Preferably, the described shearing section that is dominant adopts the recycled coarse aggregate contents natural concreting that equals 0%.
Preferably, described segmentation beam both sides are provided with frame column.Further, described frame column adopts the natural concreting that recycled coarse aggregate contents equals 0%.
Be dominant section and shearing of described moment of flexure is dominant between section and is provided with interface one, and described shearing is dominant between section and frame column and is provided with interface two.
Preferably, mode of building described in is carried out according to the related request of " GB50666-2011 concrete structure engineering job specfication ".
Preferably, adopt cast-in-place mode to build the construction method of regeneration concrete segmentation beam, specifically comprise the following steps:
1) reinforcing cage in segmentation beam is set;
2) be dominant between section adopt little plank to separate at be dominant section and shearing of moment of flexure, being dominant between section and frame column at shearing adopts little plank to separate, and described little plank timber wedge is fixed;
3) adopt regeneration concrete first to build moment of flexure to be dominant section;
4) in step 3) after operation builds, to terminate and after maintenance at least one week before final set or in final set after initial set, be dominant little plank between section and timber wedge of moment of flexure be dominant section and shearing removes, and builds shearing and to be dominant section; To be dominant after section initial set before final set building shearing, be dominant by shearing little plank between section and frame column and timber wedge remove, and adopt natural concreting frame column.
Further, described after initial set before final set or final set terminate and maintenance at least one week after, be dominant little plank between section and the timber wedge of section and shearing that moment of flexure be dominant removes, build shearing be dominant section time, need to brush concrete interface agent at the moment of flexure section two ends that are dominant.
Further, in step 4) work progress in, after initial set before final set, using vibrating spear to punish the natural concrete that belongs to different section or regeneration concrete vibrates integral by being positioned at interface one or interface two, not forming obvious plane of weakness.
Further, the regeneration concrete segmentation beam clear span length >=1500mm adopting cast-in-place mode to build, can ensure construction quality and stress performance.
Preferably, the half prefabricated half cast-in-place mode of employing builds the construction method of regeneration concrete segmentation beam, specifically comprises the following steps:
A) pre-set moment of flexure to be dominant the reinforcing cage of section;
Further, pre-set the be dominant reinforcing cage of section of moment of flexure described in can carry out in the factory.
Further, as steps A) as described in reinforcing cage when arranging, longitudinal reinforcement and waist muscle two ends are stretched out, and reserved connecting length, length in reserve meets " GB50010-2010 Code for design of concrete structures " 8.4 sections of relevant regulations.
B) adopt regeneration concrete to build moment of flexure to be dominant section, terminate and the demoulding after maintenance at least one week in final set;
Further, as step B) as described in the moment of flexure section demoulding that is dominant be transported to job site.
C) section that prefabricated moment of flexure is dominant is located, and brushes concrete interface agent at the moment of flexure section two ends that are dominant;
D) arrange shearing to be dominant the reinforcing cage of section, and be connected with the be dominant reinforcing cage of section of moment of flexure; Being dominant between section and frame column at shearing adopts little plank to separate, and described little plank timber wedge is fixed;
Further, described shearing be dominant section reinforcing cage in longitudinal reinforcement and waist muscle to reserve longitudinal reinforcement and be connected with waist muscle with the moment of flexure section that is dominant.
E) build shearing to be dominant section; After building, after initial set before final set, little plank and timber wedge are removed, adopt natural concreting frame column.
Further, in step e) work progress in, after initial set before final set, use vibrating spear to be punished by interface two to belong to the natural concrete of different section or regeneration concrete vibrates integral, do not form obvious plane of weakness.
Further, adopt the half prefabricated half cast-in-place mode regeneration concrete segmentation beam clear span length of building to be 1500 ~ 9000mm, ensure that prefabricated moment of flexure is dominant section convenient transportation.
Preferably, adopt and partly reclaim the construction method that half cast-in-place mode builds regeneration concrete segmentation beam again, specifically comprise the following steps:
I) used as the moment of flexure of the segmentation beam section that is dominant by the complete house frame beam reclaimed, location also brushes concrete interface agent at the moment of flexure section two ends that are dominant;
II) arrange shearing to be dominant the reinforcing cage of section, be dominant between section and frame column at shearing and adopt little plank to separate, described little plank timber wedge is fixed;
Further, described shearing is dominant the form of construction work of longitudinal reinforcement in reinforcing cage that section arranges should according to code requirement, adopts the modes such as colligation to be connected with the moment of flexure section longitudinal reinforcement that is dominant.
III) build shearing to be dominant section; After building, after initial set before final set, little plank and timber wedge are removed, adopt natural concreting frame column.
Further, in step III) work progress in, after initial set before final set, use vibrating spear to be punished by interface two to belong to the natural concrete of different section or regeneration concrete vibrates integral, do not form obvious plane of weakness.
Further, adopting and partly reclaiming the regeneration concrete segmentation beam clear span length that half cast-in-place mode builds again is 1500 ~ 9000mm, ensures that prefabricated moment of flexure is dominant section convenient transportation.
Adopt cast-in-place, half prefabricated half cast-in-place or the half cast-in-place mode that partly reclaims again is built time, the concrete interface agent of use is conventional concrete interfacial agents, is a kind of bonding adhesive, has superpower bonding force, excellent water resistance, resistance to ag(e)ing.Preferably, described concrete interface agent is made up of vinyl acetate-ethene.
The principle that little plank is placed specifically refers to: in field of civil engineering, the horizontal length direction of beam is called the longitudinal direction of beam, and the cross section obtained after vertically longitudinally blocking beam is the cross section of beam.General beam is rectangle, and on cross section, the length of vertical direction is called deck-molding, and on cross section, the length of horizontal direction is called deck-siding.When concreting, template has been propped up all in advance in both sides and the bottom surface of beam, adopts wooden form more.But during disturbing concrete, for preventing the concrete in segmentation beam from mutually adulterating, therefore the interfacial place between each section separates with little plank.Little plank needs the longitudinal reinforcement avoiding back portion of interface place, otherwise cannot put into beam.And the interval of top longitudinal reinforcement minimum be 30mm, therefore adopt deck-siding direction be 28mm, deck-molding direction is identical with deck-molding, and thickness is the little plank of 3mm ~ 20mm.Actual interval according to back portion longitudinal direction places little plank, and little plank adopts timber wedge to fix after placing.
The described object arranging the separation of little plank is: prevent concrete from toppling over time image side during construction and spill.
The concrete principle removing little plank and timber wedge is: when concreting, and initial set is called the making phase to final set ending phase, within one week after the making phase terminates, is called curing time.Build in work actual, after initial set before final set, remove the little plank between different section and timber wedge, concrete interface agent is used without the need to the interface place between different section, little plank and timber wedge also can not with the coagulation soil phase adhesion at interface place, the natural concrete of the different section of interface punishment genus or regeneration concrete vibrate integral by vibrating spear easy to use simultaneously, do not form obvious plane of weakness.And between expiring to maintenance after final set, remove little plank and timber wedge, little plank and timber wedge can with the coagulation soil phase adhesion at interface place, thus make the concrete surface at interface place be cellular, affect attractive in appearance, and can not at its surface brush concrete interface agent.Terminate in final set and after maintenance at least one week, remove little plank and timber wedge, little plank and timber wedge can not with the coagulation soil phase adhesion at interface place, the surface condensation of interface place is smooth, but need brush concrete interface agent to connect at interface place.
Acting as of described concrete interface agent ensures that follow-up concreting is connected with the reliable of first concreting.
A kind of regeneration concrete segmentation beam construction method, the Vierendeel girder in structural element or the application on secondary beam.
Preferably, described segmentation beam is not suitable for coupling beam or Cantilever Beams.
A kind of regeneration concrete segmentation beam, comprise be dominant section and two shearings of a moment of flexure to be dominant section, described two shearings section that is dominant lays respectively at moment of flexure and to be dominant the both sides of section, the described shearing section that is dominant is dominant between section with moment of flexure and is connected by interface, the described moment of flexure section that is dominant adopts regeneration concrete to build, and the described shearing section that is dominant adopts natural concrete or regeneration concrete to build.
Described interface one is located at be dominant section and shearing of moment of flexure and is dominant between section, and described interface two is located at shearing and is dominant between section and frame column.
Preferably, the shearing section other end that is dominant in described both sides is connected with frame column by interface two.
Preferably, the strength grade of described natural concrete or regeneration concrete is identical with designing requirement, and the described shearing section strength grade of concrete used that is dominant can not be less than moment of flexure and to be dominant section strength grade of concrete used.Further, the strength grade of described natural concrete or regeneration concrete reaches C20 ~ C45.Preferably, the strength grade of described natural concrete or regeneration concrete is C30.
Preferably, the strength grade of described regeneration concrete is by agitator timing signal, and accepted standard difference is not less than 3Mpa.Further, the strength grade of described regeneration concrete is by agitator timing signal, and accepted standard difference is 5Mpa.
The segmentation beam that construction method of the present invention is built has good stress performance, wherein, moment of flexure is dominant, and to compare to the be dominant shearing of section of shearing obvious much little for the moment of flexure of section, although the aggregate occlusion of regeneration concrete is poor, but the good and Compressive Strength of Recycled Concrete of reliable construction quality of mix-design still can be guaranteed, regeneration concrete higher for recycled coarse aggregate contents is used for moment of flexure to be dominant section, obviously can not reduces the ability of beam resist torque.For Vierendeel girder and secondary beam, the be dominant bend-carrying capacity of section of moment of flexure is guaranteed, and the be dominant aggregate occlusion ability of section of shearing is guaranteed and hooping bars layout is good, and its bearing capacity also can be guaranteed.
And, segmentation beam in the present invention, both can be built by cast-in-place mode, first adopt and meet regeneration concrete that the identical recycled coarse aggregate contents of the strength grade of technical requirements is greater than 30% and build moment of flexure and to be dominant section, then the regeneration concrete adopting the natural concrete that meets the strength grade of technical requirements or recycled coarse aggregate contents to be less than 30% is built shearing and to be dominant section; Also can be built by the half prefabricated half cast-in-place or half cast-in-place mode that partly reclaims again, first arrange reinforcing cage by designing requirement and the regeneration concrete adopting the recycled coarse aggregate contents meeting the strength grade of technical requirements to be greater than 30% is in advance built moment of flexure and to be dominant section in factory, or select existing used Vierendeel girder to be that moment of flexure is dominant section, the more natural concrete adopting the strength grade that meets technical requirements identical at the construction field (site) or the recycled coarse aggregate contents regeneration concrete that is not more than 30% shearing of building is dominant section.Construction method of the present invention is simple, easy construction, particularly adopts half prefabricated half cast-in-place or partly reclaim the mode of half cast-in-place structural again, accelerates construction speed, shorten construction period while guarantee workmanship.
As can be seen here; the construction method of a kind of regeneration concrete segmentation beam provided by the invention; use regeneration concrete as raw material; reduce structural element cost; promote the development of green building, environmental friendliness; and search out a reliable and approach for large-scale recovery recycling for concrete dead meal, there is very practical value.The regeneration concrete segmentation beam of being built by construction method of the present invention, is had good stress performance, structure is simple, reliability is high.
Accompanying drawing explanation
Fig. 1 is shown as the overall stepwise schematic views of a kind of regeneration concrete segmentation beam of the present invention
Fig. 2 is shown as the concrete arrangement of reinforcement schematic diagram of reinforcing cage in a kind of regeneration concrete segmentation beam longitudinal section of the present invention
Fig. 3 is shown as a kind of regeneration concrete segmentation beam length stepwise schematic views of the present invention
Fig. 4 is shown as the relation schematic diagram of the medium and small plank of a kind of regeneration concrete segmentation beam cross section of the present invention, timber wedge and longitudinal reinforcement
Reference numeral
1. regeneration concrete segmentation beam
2. moment of flexure is dominant section
3. shearing is dominant section
4. little plank
5. timber wedge
6. interface one
7. elongated reinforcing bar
8. bearing additional bar
9. stirrup
10. waist muscle
11. interfaces two
Detailed description of the invention
Set forth the present invention further below in conjunction with specific embodiment, should be understood that these embodiments are only not used in for illustration of the present invention and limit the scope of the invention.
Select in the present embodiment raw material and equipment as follows:
The natural fine aggregate of cement, medium sand, how series high-efficiency water-reducing agent, particle size range 0.075 ~ 5mm, reinforcing bar, vibrating spear (Tongji University's civil engineering Ministry of Education major test room is unified to be provided); Mixing water (ordinary tap water); Concrete interface agent (West Asia Chemical Co., Ltd.); Little plank (Tongji University's civil engineering Ministry of Education major test room is unified to be provided, processing dimension on request); The natural coarse aggregate (Tongji University's civil engineering Ministry of Education major test room is unified to be provided) of particle size range 5 ~ 31.5mm; The regenerated coarse aggregate (Shanghai urban construction Materials Company) of particle size range 5 ~ 31.5mm.
Embodiment 1
1 method
By cast-in-place mode, more different shearing is dominant the impact of section concrete mix, and segmentation beam 1, segmentation beam 2 and frame-generic beam 1 are built in design.
As shown in Figure 1, segmentation beam is divided into be dominant section and two shearings of a moment of flexure and is dominant section, two shearings section that is dominant lays respectively at moment of flexure and to be dominant the both sides of section, adopts cast-in-place mode to build.Arrange interface one and interface two, interface one is located at be dominant section and shearing of moment of flexure and is dominant between section, and interface two is located at shearing and is dominant between section and frame column.Reinforcing cage comprises elongated reinforcing bar, bearing additional bar, waist muscle and stirrup, is built in segmentation beam as skeleton.Segmentation beam is applicable to Vierendeel girder in structural element or secondary beam, is not suitable for coupling beam or Cantilever Beams.
The concrete steps of cast-in-place mode are as follows:
1) reinforcing cage in segmentation beam is set, here segmentation beam is Vierendeel girder, as shown in Figure 2, sectional dimension is 250mm × 500mm, the elongated reinforcing bar of section-top is 2 φ 16, and bearing longitudinal reinforcement is 5 φ 16, and section-bottom longitudinal reinforcement is 5 φ 18, waist muscle is 4 φ 12, and stirrup is φ 8100/200 (2); The form of construction work of reinforcing cage meets the related request of " 11G101-1 concrete structure construction plan integral drawing method cartographic convention and constructional detail (cast-in-situ concrete framework, shear wall, beam, plate) " and " GB50666-2011 concrete structure engineering job specfication ".
2) as shown in Figure 3, clear span length is 3000mm, and moment of flexure section and the shearing section that is dominant that is dominant is all 1000mm, and moment of flexure section, left side shearing the be dominant clear span length ratio of section of section, right side shearing that is dominant that is dominant is 1:1:1.As shown in Figure 4, between different section, adopt little plank to separate, little plank timber wedge is fixed.Little plank lateral length is 500mm, and longitudinal thickness is 20mm, is 28mm with the interval height of longitudinal reinforcement;
3) as shown in table 1, adopt recycled coarse aggregate contents to equal 100% regeneration concrete and first build moment of flexure and to be dominant section 1;
4) in step 3) after operation builds, after initial set before final set or final set terminate and maintenance at least one week after, be dominant little plank between section and the timber wedge of section and shearing that moment of flexure be dominant removes, as shown in table 1, adopt respectively recycled coarse aggregate contents equal 0% and be dominant section 1 and shearing of the recycled coarse aggregate contents concreting shearing that equals 30% to be dominant section 2, after initial set before final set, adopt natural concreting frame column.Step 3) and 4) strength grade of described natural concrete or regeneration concrete is C30.The strength grade of regeneration concrete is by agitator timing signal, and accepted standard difference is between 3 ~ 5Mpa.
In work progress, mode of building is carried out according to the related request of " GB50666-2011 concrete structure engineering job specfication ", after initial set before final set, use vibrating spear interface one or interface two to be punished to belong to the natural concrete of different section or regeneration concrete vibrates integral, do not form obvious plane of weakness.Meanwhile, adopt natural concrete directly build clear span length be 3000mm and with the frame-generic beam 1 of segmentation beam same size and size, use in construction natural concrete and regeneration concrete match ratio as shown in table 1.
The natural concrete that table 1 uses in constructing and regeneration concrete match ratio
2 results and discussion
Adopt cast-in-place mode, more different shearing is dominant the impact of section concrete mix, be be dominant section 1 and recycled coarse aggregate contents of the shearing of 0% concreting by adopting recycled coarse aggregate contents being that the shearing of 30% concreting is dominant section 2, is that the 100% concrete moment of flexure section 1 that is dominant is combined the segmentation beam 1 and segmentation beam 2 of building preparation respectively with recycled coarse aggregate contents.Measure the ultimate bending moment of segmentation beam 1 and segmentation beam 2 and corresponding amount of deflection respectively, compare with frame-generic beam 1, concrete data are in table 2.
As shown in Table 2, compare with frame-generic beam 1, the ultimate bending moment of segmentation beam 1 and segmentation beam 2 is suitable with it, and corresponding amount of deflection is also roughly the same, can be used for the natural concrete that alternative frame-generic beam 1 uses.Simultaneously, relatively segmentation beam 1 and segmentation beam 2 data known, recycled coarse aggregate contents is adopted to be that 0% concrete shearing is dominant that to compare recycled coarse aggregate contents be that 30% concrete shearing is dominant the segmentation beam 2 of section 2 for the segmentation beam 1 of section 1, the moment of flexure of its ultimate bending moment is better, corresponding amount of deflection is better, therefore, in preferably segmented beam shearing be dominant section adopt recycled coarse aggregate contents be 0% concrete.Segmentation beam 1 differs within 5% with the ultimate bending moment of segmentation beam 2, and visible shearing is dominant section when using the regeneration concrete of recycled coarse aggregate contents between 0% ~ 30%, does not affect the Ultimate Bearing Capacity of segmentation beam and normally uses.
Table 2 segmentation beam compares with frame-generic beam performance indications
| Numbering | Ultimate bending moment (kN.m) | Corresponding amount of deflection (mm) |
| Segmentation beam 1 | 311 | 42 |
| Segmentation beam 2 | 301 | 39 |
| Frame-generic beam 1 | 322 | 37 |
Embodiment 2
1 method
The natural concrete that table 3 uses in constructing and regeneration concrete match ratio
By cast-in-place mode, more different moment of flexure is dominant the impact of section concrete mix, and segmentation beam 1,3,4 and frame-generic beam 1 are built in design.As shown in Figure 1, segmentation beam is divided into be dominant section and two shearings of a moment of flexure and is dominant section, two shearings section that is dominant lays respectively at moment of flexure and to be dominant the both sides of section, adopts cast-in-place mode to build.Arrange interface one and interface two, interface one is located at be dominant section and shearing of moment of flexure and is dominant between section, and interface two is located at shearing and is dominant between section and frame column.Reinforcing cage comprises elongated reinforcing bar, bearing additional bar, waist muscle and stirrup, is built in segmentation beam as skeleton.Cast-in-place mode to build step consistent with embodiment 1.Wherein, select recycled coarse aggregate contents to be that the moment of flexure of 50%, 70%, 100% concreting is dominant section 2,3,1, and be that the shearing of the 0% concreting section 1 that is dominant is combined the segmentation beam of building preparation respectively with recycled coarse aggregate contents.
In work progress, mode of building is carried out according to the related request of " GB50666-2011 concrete structure engineering job specfication ", after initial set before final set, use vibrating spear to be punished by interface two to belong to the natural concrete of different section or regeneration concrete vibrates integral, do not form obvious plane of weakness.Meanwhile, adopt natural concrete directly build clear span length be 3000mm and with the frame-generic beam 1 of segmentation beam same size and size, use in construction natural concrete and regeneration concrete match ratio as shown in table 3.
2 results and discussion
Adopt cast-in-place mode, more different moment of flexure is dominant the impact of section concrete mix, be the moment of flexure of 50%, 70%, the 100% concreting section 2,3,1 that is dominant is that the shearing of the 0% concreting section 1 that is dominant is combined the segmentation beam 3,4,1 of building preparation respectively with recycled coarse aggregate contents by adopting recycled coarse aggregate contents.Measure the ultimate bending moment of segmentation beam 3,4,1 and corresponding amount of deflection respectively, compare with frame-generic beam 1, concrete data are in table 4.
Table 4 segmentation beam compares with frame-generic beam performance indications
| Numbering | Ultimate bending moment (kN.m) | Corresponding amount of deflection (mm) |
| Segmentation beam 3 | 309 | 44 |
| Segmentation beam 4 | 314 | 38 |
| Segmentation beam 1 | 311 | 39 |
| Frame-generic beam 1 | 322 | 37 |
As shown in Table 4, compare with frame-generic beam 1, the ultimate bending moment of segmentation beam 3,4,1 is suitable with it, and corresponding amount of deflection is good, can be used for the natural concrete that alternative frame-generic beam 1 uses.Simultaneously, relatively the data of segmentation beam 3,4,1 are known, recycled coarse aggregate contents is adopted to be that the be dominant segmentation beam 1 of section 1 of the moment of flexure of 100% concreting compares segmentation beam 3,4, its ultimate bending moment is roughly the same with corresponding amount of deflection, but the Cost of Concrete that recycled coarse aggregate contents is high is lower, better economic benefit, therefore, in segmentation beam moment of flexure be dominant the preferred recycled coarse aggregate contents of section be 100% regeneration concrete build.
Embodiment 3
1 method
By cast-in-place mode, the impact of the more different section length ratio that is dominant, segmentation beam 1,5 and frame-generic beam 1 are built in design.
As shown in Figure 1, segmentation beam is divided into be dominant section and two shearings of a moment of flexure and is dominant section, two shearings section that is dominant lays respectively at moment of flexure and to be dominant the both sides of section, adopts cast-in-place mode to build.Arrange interface one and interface two, interface one is located at be dominant section and shearing of moment of flexure and is dominant between section, and interface two is located at shearing and is dominant between section and frame column.Reinforcing cage comprises elongated reinforcing bar, bearing additional bar, waist muscle and stirrup, is built in segmentation beam as skeleton.
Cast-in-place mode to build step consistent with embodiment 1.Wherein, select recycled coarse aggregate contents to be that the moment of flexure of 100% concreting is dominant section 1,4, and be that the shearing of the 0% concreting section 1,3 that is dominant is combined the segmentation beam of building preparation respectively with recycled coarse aggregate contents.
The natural concrete that table 5 uses in constructing and regeneration concrete match ratio
In work progress, mode of building is carried out according to the related request of " GB50666-2011 concrete structure engineering job specfication ", after initial set before final set, use vibrating spear to be punished by interface two to belong to the natural concrete of different section or regeneration concrete vibrates integral, do not form obvious plane of weakness.Meanwhile, adopt natural concrete directly build clear span length be 3000mm and with the frame-generic beam 1 of segmentation beam same size and size, use in construction natural concrete and regeneration concrete match ratio as shown in table 5.
2 results and discussion
Adopt cast-in-place mode, the impact of the more different section length ratio that is dominant, build the segmentation beam 1,5 that clear span length is 3000mm.Wherein, in segmentation beam 5, moment of flexure section 4 length that is dominant is decided to be 600mm, and shearing section 3 length that is dominant is 1200mm, and moment of flexure section, left side shearing the be dominant clear span length ratio of section of section, right side shearing that is dominant that is dominant is 1:2:2; In segmentation beam 1, moment of flexure section 1 length that is dominant is decided to be 1000mm, and shearing section 1 length that is dominant is 1000mm, and moment of flexure section, left side shearing the be dominant clear span length ratio of section of section, right side shearing that is dominant that is dominant is 1:1:1.Measure the ultimate bending moment of segmentation beam 1,5 and corresponding amount of deflection respectively, compare with frame-generic beam 1, concrete data are in table 6.
As shown in Table 6, compare with frame-generic beam 1, the ultimate bending moment of segmentation beam 1,5 is suitable with it, and corresponding amount of deflection is good, can be used for the natural concrete that alternative frame-generic beam uses.Meanwhile, the data comparing segmentation beam 1,5 are known, when moment of flexure be dominant section, left side shearing be dominant section, right side shearing be dominant the clear span length ratio of section be 1:1:1 time, regenerated coarse aggregate use amount is larger, better economic benefit, the ultimate bending moment of segmentation beam is constant, and corresponding amount of deflection is relatively low.When moment of flexure be dominant section, left side shearing be dominant section, right side shearing be dominant the clear span length ratio of section be 1:2:2 time, regenerated coarse aggregate use amount is less, and economic benefit is poor, and the ultimate bending moment of segmentation beam is constant, and corresponding amount of deflection is relatively high.Therefore, the anti-bending bearing capacity of the comparison segmentation beam of the section length that is respectively dominant of segmentation beam and amount of deflection do not affect.Comprehensive, preferred moment of flexure section, left side shearing the be dominant clear span length ratio of section of section, right side shearing that is dominant that is dominant is that the segmentation beam of 1:1:1 is better.
Table 6 segmentation beam compares with frame-generic beam performance indications
| Numbering | Ultimate bending moment (kN.m) | Corresponding amount of deflection (mm) |
| Segmentation beam 1 | 311 | 39 |
| Segmentation beam 5 | 314 | 38 |
| Frame-generic beam 1 | 322 | 37 |
Embodiment 4
1 method
The impact of more different forms of construction work, segmentation beam 1,6,7 and frame-generic beam 1 are built in design.
As shown in Figure 1, segmentation beam is divided into be dominant section and two shearings of a moment of flexure and is dominant section, two shearings section that is dominant lays respectively at moment of flexure and to be dominant the both sides of section.Arrange interface one and interface two, interface one is located at be dominant section and shearing of moment of flexure and is dominant between section, and interface two is located at shearing and is dominant between section and frame column.Reinforcing cage comprises elongated reinforcing bar, bearing additional bar, waist muscle and stirrup, is built in segmentation beam as skeleton.Segmentation beam is applicable to Vierendeel girder in structural element or secondary beam, is not suitable for coupling beam or Cantilever Beams.
Segmentation beam 1 adopts cast-in-place mode to build, and step is consistent with embodiment 1.
Segmentation beam 6 adopts half prefabricated half cast-in-place mode to build, and concrete steps are as follows:
1) pre-set moment of flexure in factory to be dominant the reinforcing cage of section, as shown in Figure 2, sectional dimension is 250mm × 500mm, the moment of flexure section length that is dominant is 1000mm, the elongated reinforcing bar of section-top is 2 φ 16, section-bottom longitudinal reinforcement is 5 φ 18, and waist muscle is 4 φ 12, and stirrup is φ 8100/200 (2); The form of construction work of reinforcing cage meets the related request of " 11G101-1 concrete structure construction plan integral drawing method cartographic convention and constructional detail (cast-in-situ concrete framework, shear wall, beam, plate) " and " GB50666-2011 concrete structure engineering job specfication ".Place longitudinal reinforcement and waist muscle two ends are stretched out, reserved connecting length, length in reserve meets " GB50010-2010 Code for design of concrete structures " 8.4 sections of relevant regulations.
2) adopt the regeneration concrete of recycled coarse aggregate contents 100% to build moment of flexure to be dominant section 1, to terminate and after maintenance at least one week, the demoulding is transported to job site in final set; Prefabricated moment of flexure is dominant section 1 according to designing requirement location, brushes concrete interface agent at the moment of flexure section two ends that are dominant.
3) arrange shearing to be dominant the reinforcing cage of section 1, segmentation beam clear span length is 3000mm, moment of flexure section and the shearing section that is dominant that is dominant is all 1000mm, and moment of flexure section, left side shearing the be dominant clear span length ratio of section of section, right side shearing that is dominant that is dominant is 1:1:1.As shown in Figure 2, sectional dimension is 250mm × 500mm, and longitudinal reinforcement is 5 φ 16, and section-bottom longitudinal reinforcement is 5 φ 18, and waist muscle is 4 φ 12, and stirrup is φ 8100 (2); Connect be dominant section 2 reserved steel bar and shearing of moment of flexure to be dominant the longitudinal reinforcement of section 3 and waist muscle, the form of construction work of described reinforcing cage meets step 1) described relevant regulations.As shown in Figure 4, be dominant between section and frame column at shearing and adopt little plank to separate, described little plank timber wedge is fixed; Little plank lateral length is 500mm, and longitudinal thickness is 20mm, is 28mm with the interval height of longitudinal reinforcement.
4) as shown in table 1, the natural concreting shearing adopting recycled coarse aggregate contents to equal 0% is dominant section 1; After building, after initial set before final set, little plank and timber wedge are removed, adopt natural concreting frame column.Step 2) and 4) strength grade of described natural concrete or regeneration concrete is C30.The strength grade of regeneration concrete is by agitator timing signal, and accepted standard difference is between 3 ~ 5Mpa.
Segmentation beam 7 adopts and partly reclaims half cast-in-place mode again and prepare, and concrete steps are as follows:
1) the complete house frame beam that will reclaim, is transported to scene, and the moment of flexure as segmentation beam is dominant section 1, location, and its length is defined as 1000mm respectively, brushes concrete interface agent at moment of flexure section 1 two ends that are dominant.
2) arrange shearing to be dominant the reinforcing cage of section, two kinds of segmentation beam clear span length are 3000mm, moment of flexure section 1 length that is dominant is decided to be 1000mm, shearing section 1 length that is dominant is 1000mm, and moment of flexure section 1, left side shearing the be dominant clear span length ratio of section 1 of section 1, right side shearing that is dominant that is dominant is 1:1:1.As shown in Figure 2, the sectional dimension of segmentation beam is 250mm × 500mm, and longitudinal reinforcement is 5 φ 16, and section-bottom longitudinal reinforcement is 5 φ 18, and waist muscle is 4 φ 12, and stirrup is φ 8100 (2); Connect be dominant section reserved steel bar and shearing of moment of flexure to be dominant the longitudinal reinforcement of section and waist muscle, the form of construction work of described reinforcing cage meets relevant regulations.As shown in Figure 4, be dominant between section and frame column at shearing and adopt little plank to separate, described little plank timber wedge is fixed; Little plank lateral length is 500mm, and longitudinal thickness is 20mm, is 28mm with the interval height of longitudinal reinforcement.
3) as shown in table 7, the natural concreting shearing adopting recycled coarse aggregate contents to equal 0% is dominant section 1; After building, after initial set before final set, little plank and timber wedge are removed, adopt natural concreting frame column.Step 2) and 3) strength grade of described natural concrete or regeneration concrete is C30.The strength grade of regeneration concrete is by agitator timing signal, and accepted standard difference is between 3 ~ 5Mpa.
Adopt cast-in-place mode respectively, half prefabricated half cast-in-place mode, the half cast-in-place mode that partly reclaims again builds segmentation beam 1, 6, 7, the moment of flexure wherein adopting the regeneration concrete of recycled coarse aggregate contents 100% to build segmentation beam 1 and segmentation beam 6 is dominant section 1, the shearing adopting recycled coarse aggregate contents to equal natural concreting three beams of 0% is dominant section 1, segmentation beam 1, 6, 7 clear span length are 3000mm, moment of flexure section and the shearing section that is dominant that is dominant is all 1000mm, moment of flexure is dominant section, left side shearing is dominant section, shearing the be dominant clear span length ratio of section in right side is 1:1:1.Meanwhile, adopt natural concrete directly build clear span length be 3000mm and with the frame-generic beam 1 of segmentation beam same size and size, use in construction natural concrete and regeneration concrete match ratio as shown in table 7.
The natural concrete that table 7 uses in constructing and regeneration concrete match ratio
2 results and discussion
Adopt cast-in-place mode, half prefabricated half cast-in-place mode respectively, partly reclaim the segmentation beam 1,6,7 that half cast-in-place mode builds preparation again.Measure the ultimate bending moment of segmentation beam 1,6,7 and corresponding amount of deflection respectively, compare with frame-generic beam 1, concrete data are in table 8.
Table 8 segmentation beam compares with frame-generic beam performance indications
| Numbering | Ultimate bending moment (kN.m) | Corresponding amount of deflection (mm) |
| Segmentation beam 1 | 311 | 39 |
| Segmentation beam 6 | 332 | 35 |
| Segmentation beam 7 | 280 | 50 |
| Frame-generic beam 1 | 322 | 37 |
As shown in Table 8, compare with frame-generic beam 1, the ultimate bending moment of segmentation beam 1,6,7 is suitable with it, and corresponding amount of deflection is good, can be used for the natural concrete that alternative frame-generic beam uses.Meanwhile, the data comparing segmentation beam 1,6,7 are known, adopt the segmentation beam 1 that cast-in-place mode is built, and the ultimate bending moment of beam and the ultimate bending strength of common beam do not have difference, and corresponding amount of deflection is also roughly the same.Adopt the segmentation beam 6 that half prefabricated half cast-in-place mode is built, its ultimate bending moment and corresponding amount of deflection are with all slightly good than common beam.Adopt and partly reclaim the segmentation beam that half cast-in-place mode builds again, its ultimate bending strength depends on that the moment of flexure of re-using is dominant original bearing capacity of section beam, and the supporting capacity in this embodiment weakens to some extent than common beam.Therefore, set optimal conditions as the case may be, these three kinds of pouring construction modes can be applied in practical work, specifically select depending on actual conditions.
Embodiment 5
The impact of more different segmentation beam clear span length, segmentation beam 1,8 and frame-generic beam 1,2 are built in design.
1 method
The natural concrete that table 9 uses in constructing and regeneration concrete match ratio
As shown in Figure 1, segmentation beam is divided into be dominant section and two shearings of a moment of flexure and is dominant section, two shearings section that is dominant lays respectively at moment of flexure and to be dominant the both sides of section, adopts cast-in-place mode to build.Arrange interface one and interface two, interface one is located at be dominant section and shearing of moment of flexure and is dominant between section, and interface two is located at shearing and is dominant between section and frame column.Reinforcing cage comprises elongated reinforcing bar, bearing additional bar, waist muscle and stirrup, is built in segmentation beam as skeleton.Segmentation beam is applicable to Vierendeel girder in structural element or secondary beam, is not suitable for coupling beam or Cantilever Beams.
Cast-in-place mode to build step consistent with embodiment 1, wherein, select recycled coarse aggregate contents to be that the moment of flexure of 100% concreting is dominant section 1, and be that the shearing of the 0% concreting section 1 that is dominant is combined the segmentation beam 1,8 of building preparation respectively with recycled coarse aggregate contents.Segmentation beam 1 is all identical with embodiment 1 with frame-generic beam 1 size, and the clear span length of segmentation beam 1 is 3000mm.The clear span length of segmentation beam 8 is 9000mm, and left side shearing is dominant section: moment of flexure is dominant section: right side shearing is dominant section=1:1:1, and the length of three sections that are dominant is 3000mm.
In work progress, mode of building is carried out according to the related request of " GB50666-2011 concrete structure engineering job specfication ", after initial set before final set, use vibrating spear to be punished by interface two to belong to the natural concrete of different section or regeneration concrete vibrates integral, do not form obvious plane of weakness.Simultaneously, adopt natural concrete directly build clear span length be 3000mm and with the frame-generic beam 1 of segmentation beam same size and size, after-pouring clear span length be 9000mm and with the frame-generic beam 2 of segmentation beam same size and size, use in construction natural concrete and regeneration concrete match ratio as shown in table 9.
2 results and discussion
Adopting cast-in-place mode, is that the moment of flexure of 100% concreting shearing that section 1 and recycled coarse aggregate contents the be 0% concreting section 1 that is dominant that is dominant is combined the segmentation beam 1,8 of building preparation by adopting recycled coarse aggregate contents.Measure the ultimate bending moment of segmentation beam 1,8 and corresponding amount of deflection respectively, compare with frame-generic beam 1,2 respectively, concrete data are in table 10.
Table 10 segmentation beam compares with frame-generic beam performance indications
| Numbering | Ultimate bending moment (kN.m) | Corresponding amount of deflection (mm) |
| Segmentation beam 1 | 311 | 39 |
| Segmentation beam 8 | 310 | 117 |
| Frame-generic beam 1 | 322 | 37 |
| Frame-generic beam 2 | 320 | 111 |
As shown in Table 10, compare with frame-generic beam 1, the ultimate bending moment of segmentation beam 1 is suitable with it, and corresponding amount of deflection is good, can be used for the natural concrete that alternative frame-generic beam 1 uses.Compare with frame-generic beam 2, the ultimate bending moment of segmentation beam 8 is all more or less the same with frame-generic beam 2 with corresponding amount of deflection.Therefore, the clear span size of segmentation beam does not affect the performance of segmentation beam.
In sum, the invention provides a kind of construction method of regeneration concrete segmentation beam, can prepare the segmentation beam with good stress performance, its concrete compressive strength and tensile strength all have good reliability, fully can ensure the transmission in the beam of shearing and moment of flexure.And, the regeneration concrete that the recycled coarse aggregate contents that this construction method is dominant section employing in moment of flexure is greater than 30%, regenerated coarse aggregate all adopts from the product of discarded concrete through techniques such as crushing and water washings, effectively can solve the handling problems of discarded concrete, reduce structural cost, promote the development of green building; Adopt natural concrete or recycled coarse aggregate contents to be not more than the regeneration concrete of 30% at the shearing section that is dominant, can ensure that the aggregate occlusion of beam shearing maximum is good.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (6)
1. a regeneration concrete segmentation beam construction method, it is characterized in that, segmentation beam is divided into be dominant section and two shearings of a moment of flexure to be dominant section, described two shearings section that is dominant lays respectively at moment of flexure and to be dominant the both sides of section, adopts cast-in-place, the half prefabricated half cast-in-place or half cast-in-place mode that partly reclaims again regeneration concrete segmentation beam sectional to be built;
Adopt cast-in-place mode to build the construction method of regeneration concrete segmentation beam, specifically comprise the following steps:
1) reinforcing cage in segmentation beam is set;
2) be dominant between section adopt little plank to separate at be dominant section and shearing of moment of flexure, being dominant between section and frame column at shearing adopts little plank to separate, and described little plank timber wedge is fixed;
3) adopt regeneration concrete first to build moment of flexure to be dominant section;
4) in step 3) after operation builds, to terminate and after maintenance at least one week before final set or in final set after initial set, be dominant little plank between section and timber wedge of moment of flexure be dominant section and shearing removes, and builds shearing and to be dominant section; To be dominant after section initial set before final set building shearing, be dominant by shearing little plank between section and frame column and timber wedge remove, and adopt natural concreting frame column;
Adopt half prefabricated half cast-in-place mode to build the construction method of regeneration concrete segmentation beam, specifically comprise the following steps:
A) pre-set moment of flexure to be dominant the reinforcing cage of section;
B) adopt regeneration concrete to build moment of flexure to be dominant section, terminate and the demoulding after maintenance at least one week in final set;
C) section that prefabricated moment of flexure is dominant is located, and brushes concrete interface agent at the moment of flexure section two ends that are dominant;
D) arrange shearing to be dominant the reinforcing cage of section, and be connected with the be dominant reinforcing cage of section of moment of flexure; Being dominant between section and frame column at shearing adopts little plank to separate, and described little plank timber wedge is fixed;
E) build shearing to be dominant section; After building, after initial set before final set, little plank and timber wedge are removed, adopt natural concreting frame column;
Adopt and partly reclaim the construction method that half cast-in-place mode builds regeneration concrete segmentation beam again, specifically comprise the following steps:
I) used as the moment of flexure of the segmentation beam section that is dominant by the complete house frame beam reclaimed, location also brushes concrete interface agent at the moment of flexure section two ends that are dominant;
II) arrange shearing to be dominant the reinforcing cage of section, be dominant between section and frame column at shearing and adopt little plank to separate, described little plank timber wedge is fixed;
III) build shearing to be dominant section; After building, after initial set before final set, little plank and timber wedge are removed, adopt natural concreting frame column.
2. a kind of regeneration concrete segmentation beam construction method according to claim 1, is characterized in that, in described segmentation beam, moment of flexure section, left side shearing the be dominant clear span length ratio of section of section, right side shearing that is dominant that is dominant is 1:1 ~ 2:1 ~ 2.
3. a kind of regeneration concrete segmentation beam construction method according to claim 1, it is characterized in that, the described moment of flexure section that is dominant is the complete house frame beam that reclaims or adopts the regeneration concrete of recycled coarse aggregate contents > 30% to build; The described shearing section that is dominant adopts the regeneration concrete of recycled coarse aggregate contents≤30% or the natural concreting without regenerated coarse aggregate.
4. a kind of regeneration concrete segmentation beam construction method according to claim 1, is characterized in that, described segmentation beam both sides are provided with frame column; Described frame column adopts the natural concreting without regenerated coarse aggregate.
5. a kind of regeneration concrete segmentation beam construction method according to claim 1, is characterized in that, the regeneration concrete segmentation beam clear span length >=1500mm adopting cast-in-place mode to build; The regeneration concrete segmentation beam clear span length adopting the half prefabricated half cast-in-place or half cast-in-place mode that partly reclaims again to build is 1500 ~ 9000mm.
6. a kind of regeneration concrete segmentation beam construction method according to claim 1, is characterized in that, the Vierendeel girder in structural element or the application on secondary beam.
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