CN104032892A - Regenerated concrete segmented beam and construction method thereof - Google Patents
Regenerated concrete segmented beam and construction method thereof Download PDFInfo
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- CN104032892A CN104032892A CN201410239781.XA CN201410239781A CN104032892A CN 104032892 A CN104032892 A CN 104032892A CN 201410239781 A CN201410239781 A CN 201410239781A CN 104032892 A CN104032892 A CN 104032892A
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Abstract
The invention provides a construction method for a regenerated concrete segmented beam. The segmented beam is divided into a bending moment dominant section and two shearing force dominant sections, wherein the two shearing force dominant sections are respectively positioned on both sides of the bending moment dominant section, and the regenerated concrete segmented beam is cast in a sectional way by using the method of cast-in-place, semi-prefabrication and semi-cast-in-place, or semi-recycling and semi-cast-in-place. By adoption of the construction method, regenerated concrete is used as raw materials, the construction cost of structural members is reduced, the development of green buildings is promoted, and a reliable and large-scale recycling and reuse way for waste materials of concrete is found. Simultaneously, the construction method has the advantages of simplicity and practicability, and convenience in construction; the project quality is ensured, the construction speed is increased, and the construction period is shortened. Besides, the regenerated concrete segmented beam cast by the construction method has the advantages of good stress performance, simple structure, high reliability and high 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 engineered composite material of use amount maximum, is widely used in the engineering constructions such as house, water conservancy and municipal administration.It is to make cementitious material with cement, and sand, masonry aggregate coordinate by a certain percentage with water (can contain Admixture and admixture), through stirring, obtain.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 is in process of production, need to cut into a mountain for quarrying or salvage in a large number river sea sand, will inevitably cause serious environmental disruption to nature.For 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 fragmentation, cleaning, classification, mixes by a certain percentage with grating, partly or entirely replaces the natural aggregates such as sandstone (being mainly coarse aggregate), then the concrete that adds cement, water etc. to be mixed with.It is as a kind of novel environment friendly material of being prepared by discarded concrete, has that source is wide, green circulatory, cost are low, advantages of environment protection, are also one of most suitable methods of processing at present discarded concrete.But also there is the defects such as mechanical property discreteness is large, aggregate interlock is poor in regeneration concrete, can reduce the reliability of structure, thereby be used at present in non-structural element, and use amount is less, cannot obtain widely applying in practice of construction and promote.
Therefore,, if regeneration concrete can be used reliably in the huge structural element of consumption, will greatly promote the application and development of regeneration concrete.For discarded concrete searches out an approach reliable and large-scale recovery recycles, be conducive to promote the progress of green circulatory regeneration industry, be 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 prior art, lack the structural element of 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 moment of flexure section and two shearings section that is dominant that is dominant, described two shearings section that is dominant lays respectively at the be dominant both sides of section of moment of flexure, adopts cast-in-place, the half prefabricated half cast-in-place or half cast-in-place mode that partly reclaims again to divide section to build on regeneration concrete segmentation beam.
Preferably, in described segmentation beam, be provided with reinforcing cage as skeleton.
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 that by waste and old concrete the regeneration aggregate being mixed to form by a certain percentage, partly or entirely replaces the formulated new concrete of natural aggregate after processing, fragmentation, classification.
Preferably, the regeneration concrete of described different mixture ratio refers to the different regeneration concrete of regenerated coarse aggregate replacement rate.Further, the regeneration concrete when regenerated coarse aggregate replacement rate is 0% is natural concrete.
Described regeneration aggregate replacement rate refers to the ratio that regeneration aggregate is partly or entirely replaced to 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, described moment of flexure is dominant section for the complete house frame beam that reclaims or adopts the regeneration concrete of regenerated coarse aggregate replacement rate > 30% to build.Preferably, the described moment of flexure section that is dominant adopts the regeneration concrete of regenerated coarse aggregate replacement rate 100% to build.
Preferably, the described shearing section that is dominant adopts the regeneration concrete of regenerated coarse aggregate replacement rate≤30% or the natural concreting that regenerated coarse aggregate replacement rate equals 0%.Preferably, the described shearing natural concreting that section adopts regenerated coarse aggregate replacement rate to equal 0% that is dominant.
Preferably, described segmentation beam both sides are provided with frame column.Further, described frame column adopts the natural concreting that regenerated coarse aggregate replacement rate equals 0%.
Be dominant section and shearing of described moment of flexure is dominant and between section, is provided with interface one, and described shearing is dominant and between section and frame column, is provided with interface two.
Preferably, the 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) at be dominant section and shearing of moment of flexure, be dominant and adopt little plank to separate between section, at shearing, be dominant and adopt little plank to separate between section and frame column, described little plank is fixed with timber wedge;
3) adopt regeneration concrete first to build the moment of flexure section that is dominant;
4) in step 3) after operation builds, after initial set, before final set or in final set, finish and after at least one week of maintenance, moment of flexure little plank and the timber wedge that section and shearing be dominant between section that be dominant removed, build the shearing section that is dominant; Be dominant after section initial set before final set building shearing, little plank and timber wedge that shearing is dominant between section and frame column remove, and adopt natural concreting frame column.
Further, described after initial set before final set or final set finish and at least one week of maintenance after, moment of flexure little plank and the timber wedge that section and shearing be dominant between section that be dominant removed, build shearing while being dominant section, 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, use vibrating spear to belong to the natural concrete of different sections or regeneration concrete and vibrate and be integral being positioned at interface one or interface two punishment, do not form obvious plane of weakness.
Further, the regeneration concrete segmentation beam clear span length >=1500mm that adopts cast-in-place mode to build, can guarantee construction quality and stress performance.
Preferably, the half prefabricated half cast-in-place mode of employing is built the construction method of regeneration concrete segmentation beam, specifically comprises the following steps:
A) set in advance the be dominant reinforcing cage of section of moment of flexure;
Further, described in, setting in advance moment of flexure is dominant in the reinforcing cage Ke factory of section and carries out.
Further, as steps A) as described in reinforcing cage while arranging, stretch out at longitudinal reinforcement and waist muscle two ends, reserved connecting length, length in reserve meets 8.4 sections of relevant regulations of < < GB50010-2010 Code for design of concrete structures > >.
B) adopt regeneration concrete to build the moment of flexure section that is dominant, in final set, finish and the demoulding after at least one week of maintenance;
Further, as step B) as described in the moment of flexure section demoulding that is dominant be transported to job site.
C) prefabricated moment of flexure is dominant section location, brushes concrete interface agent at the moment of flexure section two ends that are dominant;
D) the be dominant reinforcing cage of section of shearing is set, and is connected with the be dominant reinforcing cage of section of moment of flexure; At shearing, be dominant and adopt little plank to separate between section and frame column, described little plank is fixed with timber wedge;
Further, be dominant in the reinforcing cage of section longitudinal reinforcement and waist muscle of described shearing will be connected with waist muscle with the moment of flexure reserved longitudinal reinforcement of section that is dominant.
E) build the shearing section that is dominant; 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 that interface two punishment are belonged to the natural concrete of different sections or regeneration concrete and vibrate and be integral, do not form obvious plane of weakness.
Further, adopting the regeneration concrete segmentation beam clear span length that half prefabricated half cast-in-place mode is built is 1500～9000mm, guarantees the prefabricated moment of flexure section convenient transportation that is dominant.
Preferably, adopt and partly reclaim again the construction method that half cast-in-place mode is built regeneration concrete segmentation beam, specifically comprise the following steps:
I) section that is dominant of the moment of flexure using the complete house frame beam reclaiming as segmentation beam is used, and location also brushes concrete interface agent at the moment of flexure section two ends that are dominant;
II) the be dominant reinforcing cage of section of shearing is set, at shearing, is dominant and adopts little plank to separate between section and frame column, described little plank is fixed with timber wedge;
Further, described shearing is dominant the form of construction work of longitudinal reinforcement in the reinforcing cage that section arranges should be 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 the shearing section that is dominant; 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 that interface two punishment are belonged to the natural concrete of different sections or regeneration concrete and vibrate and be 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 is again 1500～9000mm, guarantees the prefabricated moment of flexure section convenient transportation that is dominant.
When adopting cast-in-place, the half prefabricated half cast-in-place or half cast-in-place mode that partly reclaims again to build, the concrete interface agent of use is conventional concrete interface agent, is a kind of bonding adhesive, has superpower bonding force, good water resistance, resistance to ag(e)ing.Preferably, described concrete interface agent is made by vinyl acetate-ethene.
The principle that little plank is placed specifically refers to: in field of civil engineering, the horizontal length direction of beam be called beam longitudinally, the cross section that vertically longitudinally to block the cross section that obtains after beam be 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, the both sides of beam and bottom surface have all been propped up template in advance, adopt wooden form more.But during disturbing concrete, for preventing that the concrete in segmentation beam from adulterating mutually, therefore the interfacial place between each section separates with little plank.Little plank need to be avoided the longitudinal reinforcement of interface place back portion, otherwise cannot put into beam.And the interval of top longitudinal reinforcement minimum is 30mm, therefore adopt deck-siding direction, be 28mm, deck-molding direction is identical with deck-molding, the little plank that thickness is 3mm～20mm.According to back portion longitudinally actual interval place little plank, little plank adopts timber wedge to fix after placing.
Describedly the object that little plank separates is set is: during construction, prevent that concrete from toppling over time image side and spilling.
The concrete principle that removes little plank and timber wedge is: when concreting, initial set to final set ending phase is called to the making phase, after the making phase finishes, within one week, is called curing time.Actual, build in work, after initial set before final set, remove little plank and timber wedge between different sections, without the interface place between different sections, use concrete interface agent, little plank and timber wedge also not can with the coagulation soil phase adhesion at interface place, simultaneously vibrating spear easy to use belongs to the natural concrete of different sections or regeneration concrete by interface punishment and vibrates and be integral, and does not form obvious plane of weakness.And between expiring to maintenance, remove little plank and timber wedge after final set, little plank and timber wedge can with the coagulation soil phase adhesion at interface place, thereby make the concrete surface at interface place be cellular, affect attractive in appearance, and can not be at its surface brush concrete interface agent.In final set, finish and after at least one week of maintenance, remove little plank and timber wedge, little plank and timber wedge not can with the coagulation soil phase adhesion at interface place, the surface condensation of interface place is smooth, but need brush concrete interface agent at interface place to connect.
Acting as of described concrete interface agent guarantees that follow-up concreting is connected with the reliable of first concreting.
A 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 moment of flexure section and two shearings section that is dominant that is dominant, described two shearings section that is dominant lays respectively at the be dominant both sides of section of moment of flexure, the described shearing section that is dominant is dominant and by interface, is connected between section with moment of flexure, 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 the moment of flexure section strength grade of concrete used that is dominant.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, the poor 3Mpa that is not less than of accepted standard.Further, the strength grade of described regeneration concrete is by agitator timing signal, and accepted standard is poor 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 obviously little a lot of for the moment of flexure of section, although the aggregate interlock of regeneration concrete is poor, but mix-design Compressive Strength of Recycled Concrete good and reliable construction quality still can be guaranteed, regenerated coarse aggregate is replaced to regeneration concrete that rate is higher for the moment of flexure section that is dominant, can obviously not reduce the ability of beam opposing moment of flexure.For Vierendeel girder and secondary beam, the be dominant curved bearing capacity that is subject to of section of moment of flexure is guaranteed, and shearing is dominant, and the aggregate interlock ability of section is guaranteed and stirrup configuration is good, and its bearing capacity also can be guaranteed.
And, segmentation beam in the present invention, both can build by cast-in-place mode, first adopt the identical regenerated coarse aggregate replacement rate of strength grade meet technical requirements to be greater than 30% regeneration concrete and build the moment of flexure section that is dominant, then adopt the natural concrete of the strength grade that meets technical requirements or regenerated coarse aggregate replacement rate to be less than 30% regeneration concrete to build the shearing section that is dominant; Also can build by the half prefabricated half cast-in-place or half cast-in-place mode that partly reclaims again, Xian factory arranges reinforcing cage by designing requirement and adopts in advance the regenerated coarse aggregate replacement rate of the strength grade meet technical requirements to be greater than 30% regeneration concrete and builds the moment of flexure section that is dominant, or to select existing used Vierendeel girder be the moment of flexure section that is dominant, then adopt at the construction field (site) and meet natural concrete that the strength grade of technical requirements is identical or regenerated coarse aggregate replacement rate and be not more than shearing that 30% regeneration concrete the builds section that is dominant.Construction method of the present invention is simple, easy construction, particularly adopts half prefabricated half cast-in-placely or partly reclaim the mode of half cast-in-place structural again, when guaranteeing workmanship, has accelerated construction speed, shortens construction period.
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 development, the environmental friendliness of green building; and for concrete dead meal searches out an approach reliable and large-scale recovery recycles, there is very practical value.The regeneration concrete segmentation beam of building by construction method of the present invention, has good stress performance, simple in structure, reliability is high.
Accompanying drawing explanation
Fig. 1 is shown as the whole segmentation schematic diagram 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 of the present invention longitudinal section
Fig. 3 is shown as a kind of regeneration concrete segmentation beam length segmentation schematic diagram of the present invention
Fig. 4 is shown as the schematic diagram that is related to 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. the moment of flexure section that is dominant
3. the shearing section that is dominant
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
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention, should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.
In the present embodiment, select raw material and equipment as follows:
Cement, medium sand, how series high-efficiency water-reducing agent, the natural fine aggregate of particle size range 0.075～5mm, reinforcing bar, vibrating spear (Tongji University's civil engineering Ministry of Education major test chamber unification provides); 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 chamber unification provides, on request processing dimension); The natural coarse aggregate of particle size range 5～31.5mm (Tongji University's civil engineering Ministry of Education major test chamber unification provides); The regenerated coarse aggregate of particle size range 5～31.5mm (Shanghai urban construction Materials Company).
Embodiment 1
1 method
By cast-in-place mode, the be dominant impact of section concrete mix of more different shearings, 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 moment of flexure section and two shearings section that is dominant that is dominant, two shearings section that is dominant lays respectively at the be dominant both sides of section of moment of flexure, adopts cast-in-place mode to build.Interface one and interface two are set, and 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 or the secondary beam in structural element, 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, the segmentation beam is here Vierendeel girder, as shown in Figure 2, sectional dimension is 250mm * 500mm, the elongated reinforcing bar in top, cross section is 2 φ 16, and bearing longitudinal reinforcement is 5 φ 16, and bottom, cross section longitudinal reinforcement is 5 φ 18, waist muscle is 4 φ 12, and stirrup is φ 8@100/200 (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, adopt little plank to separate between different sections, little plank is fixed with timber wedge.Little plank lateral length is 500mm, and longitudinal thickness is 20mm, with the interval height of longitudinal reinforcement be 28mm;
3) as shown in table 1, adopt regenerated coarse aggregate replacement rate to equal 100% regeneration concrete and first build the moment of flexure section 1 that is dominant;
4) in step 3) after operation builds, after initial set before final set or final set finish and at least one week of maintenance after, moment of flexure little plank and the timber wedge that section and shearing be dominant between section that be dominant removed, as shown in table 1, adopt respectively regenerated coarse aggregate replacement rate equal 0% and regenerated coarse aggregate replacement rate equal 30% concreting shearing section 1 and the shearing section 2 that is dominant that is dominant, 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 is poor is between 3～5Mpa.
In work progress, the 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 that interface one or interface two punishment are belonged to the natural concrete of different sections or regeneration concrete and vibrate and be 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, in construction, use natural concrete and regeneration concrete match ratio as shown in table 1.
Natural concrete and the regeneration concrete match ratio in table 1 construction, used
2 results and discussion
Adopt cast-in-place mode, the be dominant impact of section concrete mix of more different shearings, by adopting regenerated coarse aggregate replacement rate, being that be dominant section 1 and regenerated coarse aggregate replacement rate of the shearing of 0% concreting is the shearing of the 30% concreting section 2 that is dominant, is that 100% concrete moment of flexure is dominant section 1 in conjunction with segmentation beam 1 and the segmentation beam 2 of building preparation with regenerated coarse aggregate replacement rate respectively.Measure respectively the ultimate bending moment and corresponding amount of deflection of segmentation beam 1 and segmentation beam 2, 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 substituting the natural concrete that frame-generic beam 1 is used.Simultaneously, relatively segmentation beam 1 and segmentation beam 2 data are known, adopting regenerated coarse aggregate replacement rate is that 0% concrete shearing is dominant that to compare regenerated coarse aggregate replacement rate be the be dominant segmentation beam 2 of section 2 of 30% concrete shearing 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 is dominant, and to adopt regenerated coarse aggregate replacement rate be 0% concrete to section.Segmentation beam 1 differs within 5% with the ultimate bending moment of segmentation beam 2, and visible shearing is dominant section while using the regeneration concrete of regenerated coarse aggregate replacement rate between 0%～30%, does not affect the Ultimate Bearing Capacity of segmentation beam and normally uses.
Table 2 segmentation beam and the comparison of 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
Natural concrete and the regeneration concrete match ratio in table 3 construction, used
By cast-in-place mode, the be dominant impact of section concrete mix of more different moments of flexure, segmentation beam 1,3,4 and frame-generic beam 1 are built in design.As shown in Figure 1, segmentation beam is divided into moment of flexure section and two shearings section that is dominant that is dominant, two shearings section that is dominant lays respectively at the be dominant both sides of section of moment of flexure, adopts cast-in-place mode to build.Interface one and interface two are set, and 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, selecting regenerated coarse aggregate replacement rate is the moment of flexure of 50%, 70%, the 100% concreting section 2,3,1 that is dominant, and being 0% concreting with regenerated coarse aggregate replacement rate respectively, shearing is dominant section 1 in conjunction with the segmentation beam of building preparation.
In work progress, the 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 that interface two punishment are belonged to the natural concrete of different sections or regeneration concrete and vibrate and be 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, in construction, use natural concrete and regeneration concrete match ratio as shown in table 3.
2 results and discussion
Adopt cast-in-place mode, the be dominant impact of section concrete mix of more different moments of flexure is that the moment of flexure of 50%, 70%, the 100% concreting section 2,3,1 that is dominant is 0% concreting with regenerated coarse aggregate replacement rate respectively shearing is dominant section 1 in conjunction with the segmentation beam 3,4,1 of building preparation by adopting regenerated coarse aggregate replacement rate.Measure respectively ultimate bending moment and the corresponding amount of deflection of segmentation beam 3,4,1, compare with frame-generic beam 1, concrete data are in Table 4.
Table 4 segmentation beam and the comparison of 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 substituting the natural concrete that frame-generic beam 1 is used.Simultaneously, relatively the data of segmentation beam 3,4,1 are known, adopting regenerated coarse aggregate replacement rate is that the be dominant segmentation beam 1 of section 1 of the moment of flexure of 100% concreting is compared segmentation beam 3,4, its ultimate bending moment and corresponding amount of deflection are roughly the same, but the Cost of Concrete that regenerated coarse aggregate replacement rate is high is lower, better economic benefit, therefore, in segmentation beam, the moment of flexure regeneration concrete that the preferred regenerated coarse aggregate replacement of section rate is 100% that is dominant is built.
Embodiment 3
1 method
By cast-in-place mode, the impact of the more different section length ratios that are dominant, segmentation beam 1,5 and frame-generic beam 1 are built in design.
As shown in Figure 1, segmentation beam is divided into moment of flexure section and two shearings section that is dominant that is dominant, two shearings section that is dominant lays respectively at the be dominant both sides of section of moment of flexure, adopts cast-in-place mode to build.Interface one and interface two are set, and 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, selecting regenerated coarse aggregate replacement rate is the moment of flexure of the 100% concreting section 1,4 that is dominant, and being 0% concreting with regenerated coarse aggregate replacement rate respectively, shearing is dominant section 1,3 in conjunction with the segmentation beam of building preparation.
Natural concrete and the regeneration concrete match ratio in table 5 construction, used
In work progress, the 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 that interface two punishment are belonged to the natural concrete of different sections or regeneration concrete and vibrate and be 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, in construction, use 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 ratios that are dominant, building clear span length is the segmentation beam 1,5 of 3000mm.Wherein, in segmentation beam 5, moment of flexure section 4 length that are dominant are decided to be 600mm, and shearing section 3 length that are dominant are 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 respectively ultimate bending moment and the corresponding amount of deflection of segmentation beam 1,5, 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 substituting the natural concrete that frame-generic beam is used.Meanwhile, relatively the data of segmentation beam 1,5 are known, when moment of flexure the be dominant section, right side shearing of section, left side shearing that be dominant is dominant the clear span length ratio of section while being 1:1:1, 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 the be dominant section, right side shearing of section, left side shearing that be dominant is dominant the clear span length ratio of section while being 1:2:2, 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, not impact of 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.Comprehensive, preferably moment of flexure section, left side shearing section, the right side shearing segmentation beam that the clear span length ratio of section is 1:1:1 that is dominant that is dominant that is dominant is better.
Table 6 segmentation beam and the comparison of 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 moment of flexure section and two shearings section that is dominant that is dominant, two shearings section that is dominant lays respectively at the be dominant both sides of section of moment of flexure.Interface one and interface two are set, and 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 or the secondary beam in structural element, 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) in factory, set in advance the be dominant reinforcing cage of section of moment of flexure, 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 in top, cross section is 2 φ 16, bottom, cross section longitudinal reinforcement is 5 φ 18, and waist muscle is 4 φ 12, and stirrup is φ 8@100/200 (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 > >.The longitudinal reinforcement of placing and waist muscle two ends stretch out, reserved connecting length, length in reserve meets 8.4 sections of relevant regulations of < < GB50010-2010 Code for design of concrete structures > >.
2) adopt the regeneration concrete of regenerated coarse aggregate replacement rate 100% to build the moment of flexure section 1 that is dominant, final set finish and after at least one week of maintenance the demoulding be transported to job site; Prefabricated moment of flexure is dominant to section 1 according to designing requirement location, at the moment of flexure section two ends that are dominant, brushes concrete interface agent.
3) the be dominant reinforcing cage of section 1 of shearing is set, 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 bottom, cross section longitudinal reinforcement is 5 φ 18, and waist muscle is 4 φ 12, and stirrup is φ 8@100 (2); Connect moment of flexure be dominant section 2 reserved steel bars and shearing be dominant longitudinal reinforcement and the waist muscle of section 3, the form of construction work of described reinforcing cage meets step 1) described relevant regulations.As shown in Figure 4, at shearing, be dominant and adopt little plank to separate between section and frame column, described little plank is fixed with timber wedge; Little plank lateral length is 500mm, and longitudinal thickness is 20mm, with the interval height of longitudinal reinforcement be 28mm.
4) as shown in table 1, adopt regenerated coarse aggregate replacement rate to equal 0% the natural concreting shearing section 1 that is dominant; 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 is poor 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) by the complete house frame beam reclaiming, be transported to scene, as the moment of flexure of the segmentation beam section 1 that is dominant, location, its length is defined as respectively 1000mm, at moment of flexure section 1 two ends that are dominant, brushes concrete interface agent.
2) the be dominant reinforcing cage of section of shearing is set, 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 bottom, cross section longitudinal reinforcement is 5 φ 18, and waist muscle is 4 φ 12, and stirrup is φ 8@100 (2); Connect moment of flexure be dominant section reserved steel bar and shearing be dominant longitudinal reinforcement and the waist muscle of section, the form of construction work of described reinforcing cage meets relevant regulations.As shown in Figure 4, at shearing, be dominant and adopt little plank to separate between section and frame column, described little plank is fixed with timber wedge; Little plank lateral length is 500mm, and longitudinal thickness is 20mm, with the interval height of longitudinal reinforcement be 28mm.
3) as shown in table 7, adopt regenerated coarse aggregate replacement rate to equal 0% the natural concreting shearing section 1 that is dominant; 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 is poor is between 3～5Mpa.
Adopt respectively cast-in-place mode, half prefabricated half cast-in-place mode, the half cast-in-place mode that partly reclaims is again built segmentation beam 1, 6, 7, the moment of flexure that wherein adopts the regeneration concrete of regenerated coarse aggregate replacement rate 100% to build segmentation beam 1 and segmentation beam 6 section 1 that is dominant, the shearing that adopts regenerated coarse aggregate replacement rate to equal three beams of natural concreting of 0% section 1 that is dominant, 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, the moment of flexure section that is dominant, the left side shearing section that is dominant, 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, in construction, use natural concrete and regeneration concrete match ratio as shown in table 7.
Natural concrete and the regeneration concrete match ratio in table 7 construction, used
2 results and discussion
Adopt respectively cast-in-place mode, half prefabricated half cast-in-place mode, partly reclaim again the segmentation beam 1,6,7 that half cast-in-place mode is built preparation.Measure respectively ultimate bending moment and the corresponding amount of deflection of segmentation beam 1,6,7, compare with frame-generic beam 1, concrete data are in Table 8.
Table 8 segmentation beam and the comparison of 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 substituting the natural concrete that frame-generic beam is used.Meanwhile, relatively the data of segmentation beam 1,6,7 are known, the segmentation beam 1 that adopts cast-in-place mode to build, 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.The segmentation beam 6 that adopts half prefabricated half cast-in-place mode to build, its ultimate bending moment with corresponding amount of deflection with all slightly good than common beam.Adopt and partly to reclaim the segmentation beam that half cast-in-place mode is built again, its ultimate bending strength depends on be dominant original bearing capacity of section beam of the moment of flexure of re-using, and the supporting capacity in this embodiment weakens to some extent than common beam.Therefore, set as the case may be optimal conditions, 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
Natural concrete and the regeneration concrete match ratio in table 9 construction, used
As shown in Figure 1, segmentation beam is divided into moment of flexure section and two shearings section that is dominant that is dominant, two shearings section that is dominant lays respectively at the be dominant both sides of section of moment of flexure, adopts cast-in-place mode to build.Interface one and interface two are set, and 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 or the secondary beam in structural element, is not suitable for coupling beam or Cantilever Beams.
Cast-in-place mode to build step consistent with embodiment 1, wherein, selecting regenerated coarse aggregate replacement rate is the moment of flexure of the 100% concreting section 1 that is dominant, and being 0% concreting with regenerated coarse aggregate replacement rate respectively, shearing is dominant section 1 in conjunction with the segmentation beam 1,8 of building preparation.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, the left side shearing section that is dominant: the moment of flexure section that is dominant: the right side shearing section=1:1:1 that is dominant, the length of three sections that are dominant is 3000mm.
In work progress, the 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 that interface two punishment are belonged to the natural concrete of different sections or regeneration concrete and vibrate and be 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, build afterwards clear span length and be 9000mm and with the frame-generic beam 2 of segmentation beam same size and size, in construction, use 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 the 100% concreting shearing that section 1 and regenerated coarse aggregate replacement rate be 0% concreting that is dominant is dominant section 1 in conjunction with the segmentation beam 1,8 of building preparation by adopting regenerated coarse aggregate replacement rate.Measure respectively ultimate bending moment and the corresponding amount of deflection of segmentation beam 1,8, compare respectively with frame-generic beam 1,2, concrete data are in Table 10.
Table 10 segmentation beam and the comparison of 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 substituting the natural concrete that frame-generic beam 1 is used.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, can fully guarantee the transmission in the beam of shearing and moment of flexure.And, this construction method is at the moment of flexure regeneration concrete that regenerated coarse aggregate replacement rate that section adopts is greater than 30% that is dominant, regenerated coarse aggregate all adopts from discarded concrete the product through techniques such as crushing and water washings, can effectively solve the handling problems of discarded concrete, reduce structural cost, promote the development of green building; At the shearing section that is dominant, adopt natural concrete or regenerated coarse aggregate replacement rate to be not more than 30% regeneration concrete, can guarantee that the aggregate interlock of beam shearing maximum is good.So the present invention has effectively overcome 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 can, under spirit of the present invention and category, modify or change above-described embodiment.Therefore, such as in affiliated technical field, have and conventionally know that the knowledgeable, not departing from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (9)
1. a regeneration concrete segmentation beam construction method, it is characterized in that, segmentation beam is divided into moment of flexure section and two shearings section that is dominant that is dominant, described two shearings section that is dominant lays respectively at the be dominant both sides of section of moment of flexure, adopts cast-in-place, the half prefabricated half cast-in-place or half cast-in-place mode that partly reclaims again to divide section to build on regeneration concrete segmentation beam.
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, described moment of flexure is dominant section for the complete house frame beam that reclaims or adopts the regeneration concrete of regenerated coarse aggregate replacement rate > 30% to build; Described shearing is dominant that section adopts the regeneration concrete of regenerated coarse aggregate replacement rate≤30% or without the natural concreting of 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, adopts cast-in-place mode to build the construction method of regeneration concrete segmentation beam, specifically comprises the following steps:
1) reinforcing cage in segmentation beam is set;
2) at be dominant section and shearing of moment of flexure, be dominant and adopt little plank to separate between section, at shearing, be dominant and adopt little plank to separate between section and frame column, described little plank is fixed with timber wedge;
3) adopt regeneration concrete first to build the moment of flexure section that is dominant;
4) in step 3) after operation builds, after initial set, before final set or in final set, finish and after at least one week of maintenance, moment of flexure little plank and the timber wedge that section and shearing be dominant between section that be dominant removed, build the shearing section that is dominant; Be dominant after section initial set before final set building shearing, little plank and timber wedge that shearing is dominant between section and frame column remove, and adopt natural concreting frame column.
6. a kind of regeneration concrete segmentation beam construction method according to claim 1, is characterized in that, the half prefabricated half cast-in-place mode of employing is built the construction method of regeneration concrete segmentation beam, specifically comprises the following steps:
A) set in advance the be dominant reinforcing cage of section of moment of flexure;
B) adopt regeneration concrete to build the moment of flexure section that is dominant, in final set, finish and the demoulding after at least one week of maintenance;
C) prefabricated moment of flexure is dominant section location, brushes concrete interface agent at the moment of flexure section two ends that are dominant;
D) the be dominant reinforcing cage of section of shearing is set, and is connected with the be dominant reinforcing cage of section of moment of flexure; At shearing, be dominant and adopt little plank to separate between section and frame column, described little plank is fixed with timber wedge;
E) build the shearing section that is dominant; After building, after initial set, before final set, little plank and timber wedge are removed, adopt natural concreting frame column.
7. a kind of regeneration concrete segmentation beam construction method according to claim 1, is characterized in that, adopts and partly reclaims the construction method that half cast-in-place mode is built regeneration concrete segmentation beam again, specifically comprises the following steps:
I) section that is dominant of the moment of flexure using the complete house frame beam reclaiming as segmentation beam is used, and location also brushes concrete interface agent at the moment of flexure section two ends that are dominant;
II) the be dominant reinforcing cage of section of shearing is set, at shearing, is dominant and adopts little plank to separate between section and frame column, described little plank is fixed with timber wedge;
III) build the shearing section that is dominant; After building, after initial set, before final set, little plank and timber wedge are removed, adopt natural concreting frame column.
8. according to the arbitrary described a kind of regeneration concrete segmentation beam construction method of claim 5-7, it is characterized in that the regeneration concrete segmentation beam clear span length >=1500mm that adopts cast-in-place mode to build; Adopting half prefabricated half regeneration concrete segmentation beam clear span length cast-in-place or that the half cast-in-place mode that partly reclaims is again built is 1500～9000mm.
9. 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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