CN103470036B - A kind of outer construction method of choosing structure - Google Patents
A kind of outer construction method of choosing structure Download PDFInfo
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- CN103470036B CN103470036B CN201310396256.4A CN201310396256A CN103470036B CN 103470036 B CN103470036 B CN 103470036B CN 201310396256 A CN201310396256 A CN 201310396256A CN 103470036 B CN103470036 B CN 103470036B
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Abstract
The invention provides a kind of outer construction method of choosing structure, it comprises the steps: step one: analyze before construction work, to determine load case, and analyzes mode and component stability stress ratio, ultimate bearing capacity three aspects; Step 2: design support system; Step 3: install support system; Step 4: install and outer chooses structure, it comprises installing chooses reinforced concrete column inside structure and agent structure outward, and installs outer Cantilever Beams and the diagonal brace of choosing structure; Step 5: remove support system.Outer construction method simplicity of design of choosing structure provided by the invention, easy construction, cost is lower.Further, before construction, carry out performance analysis, determine structure maximum displacement and stress position under the most unfavorable processing condition combination, pre-control can be carried out to the safe condition in work progress, ensure the safety of construction operation.
Description
Technical field
The present invention relates to building field, particularly relate to a kind of outer construction method of choosing structure.
Background technology
Along with expanding economy, the requirement of people to building is more and more higher, not only requires multiple functional, and focuses on the appearance and modeling of building.So, create the building of some large spans, large cantilever, large space, the curved surface opposite sex etc. thereupon.Cantilevered structure can be used for change structure appearance and modeling, and it is divided into individual layer to encorbelment and multilayer cantilever.Usually, cantilevered structure adopts the measure such as overall lower support or top oblique pull to install, and after overall structure has been constructed, then carries out entirety unloading to cantilevered structure.The measure cost that this technique often drops into is huge, is unfavorable for environmental protection and energy saving construction requirement.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of structure simple, cost is low, and the outer construction method of choosing structure of construction safety.
The present invention for solving the problems of the technologies described above taked technical scheme is:
An outer construction method of choosing structure, this outer construction method of choosing structure comprises the steps:
Step one: analyze before construction work, to determine load case, and analyzes mode and component stability stress ratio, ultimate bearing capacity three aspects;
Step 2: design support system;
Step 3: install support system;
Step 4: install and outer chooses structure, it comprises installing chooses reinforced concrete column inside structure and agent structure outward, and installs outer Cantilever Beams and the diagonal brace of choosing structure;
Step 5: remove support system;
Wherein, Cantilever Beams and the diagonal brace step of choosing structure outside the installation in described step 4 also specifically comprise the steps:
Step a: the reinforced concrete column chosen outward inside structure is mounted to 2 layers, less than 2 layers and 2 layers agent structure concrete strengths reach designing requirement, first install in the below of 1 layer of top-hung outrigger end position and fix temporary support moulding bed, the outer Cantilever Beams choosing 1 layer, structure top is installed;
Step b: install the diagonal brace on the outer Cantilever Beams choosing 1 layer, structure top, installs outer 3 ~ 4 layers of reinforced concrete column chosen inside structure simultaneously;
Step c: build the outer 3 layer main body structural concretes chosen inside structure, after concrete strength reaches designing requirement, installs outer structural element and the 2 layers of Cantilever Beams pushed up of choosing 2 layers, structure;
Steps d: install the diagonal brace on the outer Cantilever Beams choosing 2 layers, structure top, builds the outer 4 layer main body structural concretes chosen inside structure;
Step e: keep outer speed of choosing the slow one deck of structural rate agent structure to construct, choose structure installment to 4 layer outside making.
In such scheme, choose the welding of less than 4 layers and 4 layers, structure outward and after acceptance(check), remove support system.
In such scheme, after removing support system, comprise the step of the superstructure of installing agent structure further.
In such scheme, after the superstructure of agent structure is installed, comprise installation 5 layers and above outer step of choosing structure further.
In such scheme, the computational methods of load FH are: FH=1.2(D+0.5L)+1.3E+0.5EV+0.28W, and wherein, D is dead load, L is mobile load, E is horizontal earthquake load, EV is vertical earthquake loading, W is that wind carries.
In such scheme, support system selects bottom temporary support moulding bed, and the slenderness ratio of bottom temporary support moulding bed controls within 150.
In such scheme, support system is installed and comprises: bottom temporary support moulding bed and ground adopt buried piece to be welded and fixed, and its degree control at H/1000, and is not more than 10mm, and H refers to the height of bottom temporary support moulding bed.
In such scheme, the outer reinforced concrete column chosen inside structure is installed and comprises: reinforced concrete column carries out segmentation according to a two-layer joint, and installing master control object is overhanging steel corbel.
In such scheme, install outer agent structure of choosing inside structure and comprise: the concrete of agent structure adopts placement layer by layer, builds thickness for every layer and is no more than 50cm, concrete wall body has the position of steel column to adopt symmetry to build.
Compared with prior art, the technique effect that the present invention obtains is:
1, simplicity of design of the present invention, easy construction, cost is lower.
2, carry out performance analysis before the present invention's construction, determine structure maximum displacement and stress position under the most unfavorable processing condition combination, pre-control can be carried out to the safe condition in work progress, ensure the safety of construction operation.
Accompanying drawing explanation
Fig. 1 is the outer flow chart choosing the construction method of structure provided by the invention.
Fig. 2 to Fig. 8 is the concrete structure schematic diagram that Fig. 1 China and foreign countries choose the construction method of structure.
In figure: 1-reinforced concrete column, 2-bottom temporary support moulding bed, 3-agent structure, 4-Cantilever Beams, 5-diagonal brace.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described, and certain following embodiment should not be construed as limitation of the present invention.
Outer construction method of choosing structure provided by the invention as shown in Figure 1 to Figure 8 shows the.
This outer construction method of choosing structure comprises the steps.
Step one: analyze before construction work, to determine load case, and analyzes mode and component stability stress ratio, ultimate bearing capacity three aspects.Structure maximum displacement and stress position under the most unfavorable processing condition combination is determined by analyzing, as the design considerations of support system, and the region of work progress priority control.Particularly, the computational methods of load FH are: FH=1.2(D+0.5L)+1.3E+0.5EV+0.28W, and wherein, D is dead load, L is mobile load, E is horizontal earthquake load, EV is vertical earthquake loading, W is that wind carries.
Step 2: design support system.Usually, support system adopts lower support system or portion's oblique pull support system two kinds of forms, and concrete form can be chosen design feature and selects according to folded.The cross section section bar that generally to select main shaft symmetrical etc. steady.When adopting lower support system, generally only needing monolithic stability to check, slenderness ratio is controlled within 150.And top oblique pull support system tension, safety factor controls more than 2, and namely stress checking calculation ratio controls below 0.5.In the present embodiment, support system adopts lower support system, particularly, adopt bottom temporary support moulding bed 2, and the slenderness ratio of bottom temporary support moulding bed 2 controls within 150.
Step 3: prepare before construction.Usually, after design support system, before construction, carry out preparation of construction, as comprised the making of braced structures, component site acceptance etc.
Step 4: install support system.In the present embodiment, before construction, steel embedded part should be buried underground at supporting point position, as the tie point on support system and ground.Bottom temporary support moulding bed 2 and ground adopt buried piece to be welded and fixed, and its degree control at H/1000, and is not more than 10mm, and H refers to the height of bottom temporary support moulding bed.
Step 5: install and outer chooses structure, it comprises installing chooses reinforced concrete column 1 inside structure and agent structure 3 outward, and installs outer Cantilever Beams 4 and the diagonal brace 5 of choosing structure.
In the present embodiment, the outer reinforced concrete column 1 chosen inside structure is installed and comprises: reinforced concrete column 1 carries out segmentation according to a two-layer joint, and installing master control object is overhanging steel corbel.
Install outer agent structure 3 of choosing inside structure to comprise: the concrete of agent structure 3 adopts placement layer by layer, builds thickness for every layer and is no more than 50cm, concrete wall body has the position of steel column to adopt symmetry to build.
The concrete mounting method of the Cantilever Beams 4 and diagonal brace 5 of choosing structure outside the installation in the present embodiment comprises the steps:
Step a: the reinforced concrete column 1 chosen outward inside structure is mounted to 2 layers, less than 2 layers and 2 layers agent structure 3 concrete strengths reach designing requirement, first install in the below of 1 layer of top-hung outrigger end position and fix temporary support moulding bed 2, the outer Cantilever Beams choosing 1 layer, structure top is installed;
Step b: install the diagonal brace 5 on the outer Cantilever Beams choosing 1 layer, structure top, installs outer 3 ~ 4 layers of reinforced concrete column 1 chosen inside structure simultaneously;
Step c: build outer 3 layer main body structure 3 concrete chosen inside structure, after concrete strength reaches designing requirement, installs outer structural element and the 2 layers of Cantilever Beams pushed up of choosing 2 layers, structure;
Steps d: install the diagonal brace 5 on the outer Cantilever Beams choosing 2 layers, structure top, builds the outer 4 layer main body structural concretes chosen inside structure;
Step e: keep outer speed of choosing the slow one deck of structural rate agent structure to construct, choose structure installment to 4 layer outside making.
Step 6: remove support system: choose the welding of less than 4 layers and 4 layers, structure outward and after acceptance(check), remove bottom temporary support moulding bed 2.
Step 7: the superstructure of installing agent structure.
Step 8: install 5 layers and above choose structure outward, its concrete way and step 5 are substantially identical, do not repeat them here.All outer choose structure installment after, carry out an acceptance inspection.
In the present embodiment, choose outside in the work progress of structure, measurement monitoring be carried out.Particularly, for cantilevered structure, the control of springing quantum is the dominant item measured.Every layer of cantilevered structure arranges a measuring control point, for monitoring the distortion of end of encorbelmenting.Measuring control point is selected in the agent structure floor of root of encorbelmenting, and avoids because foundation settlement causes measure error.Choosing after structure installment completes outward, in time self-adhesive type reflector plate being set in termination of encorbelmenting, for detecting welding deformation and lower flexure strain for every layer.Monitoring frequency is each before and after changing according to construction operating mode to be surveyed once.When survey data is undergone mutation, site operation should be stopped and by notify items portion.
Choose outward structure construction complete after, welding for steel structure be entered.Particularly, welding situation is divided into following several situation: in plane, pointwise is welded from inside to outside; Steel column after first diagonal brace on facade, avoid same rod part two ends to weld simultaneously; Node location welds according to first bottom flange, rear top flange; Position while welding, according to multi-pass welding, is often soldered together and should clears up welding slag and surface splashing in time, when finding to affect the defect of welding quality, can weld after should removing again.Usually, welded after 24 hours and carried out Ultrasonic Nondestructive, that cannot detect for ultrasonic wave carries out radiographic inspection again.
Outer construction method simplicity of design of choosing structure provided by the invention, easy construction, cost is lower.Further, before construction, carry out performance analysis, determine structure maximum displacement and stress position under the most unfavorable processing condition combination, pre-control can be carried out to the safe condition in work progress, ensure the safety of construction operation.
It should be noted that, those of ordinary skill in the art should be appreciated that and can modify to technical scheme of the present invention or equivalent replacement, and does not depart from aim and the scope of technical solution of the present invention, and it all should be encompassed in the middle of right of the present invention.
Claims (9)
1. choose a construction method for structure outward, it is characterized in that, described construction method comprises the steps:
Step one: analyze before construction work, to determine load case, and analyzes mode and component stability stress ratio, ultimate bearing capacity three aspects;
Step 2: design support system;
Step 3: install support system;
Step 4: install and outer chooses structure, it comprises installing chooses reinforced concrete column inside structure and agent structure outward, and installs outer Cantilever Beams and the diagonal brace of choosing structure;
Step 5: remove support system;
Wherein, Cantilever Beams and the diagonal brace step of choosing structure outside the installation in described step 4 also specifically comprise the steps:
Step a: the reinforced concrete column chosen outward inside structure is mounted to 2 layers, less than 2 layers and 2 layers agent structure concrete strengths reach designing requirement, first install in the below of 1 layer of top-hung outrigger end position and fix temporary support moulding bed, the outer Cantilever Beams choosing 1 layer, structure top is installed;
Step b: install the diagonal brace on the outer Cantilever Beams choosing 1 layer, structure top, installs outer 3 ~ 4 layers of reinforced concrete column chosen inside structure simultaneously;
Step c: build the outer 3 layer main body structural concretes chosen inside structure, after concrete strength reaches designing requirement, installs outer structural element and the 2 layers of Cantilever Beams pushed up of choosing 2 layers, structure;
Steps d: install the diagonal brace on the outer Cantilever Beams choosing 2 layers, structure top, builds the outer 4 layer main body structural concretes chosen inside structure;
Step e: keep outer speed of choosing the slow one deck of structural rate agent structure to construct, choose structure installment to 4 layer outside making.
2. outer construction method of choosing structure according to claim 1, is characterized in that, chooses the welding of less than 4 layers and 4 layers, structure outward and after acceptance(check), removes support system.
3. outer construction method of choosing structure according to claim 2, is characterized in that, comprise the step of the superstructure of installing agent structure after removing support system further.
4. outer construction method of choosing structure according to claim 3, is characterized in that, comprise installation 5 layers and above outer step of choosing structure further after installing the superstructure of agent structure.
5. outer construction method of choosing structure according to claim 1, it is characterized in that, the computational methods of load FH are: FH=1.2(D+0.5L)+1.3E+0.5EV+0.28W, and wherein, D is dead load, L is mobile load, E is horizontal earthquake load, EV is vertical earthquake loading, W is that wind carries.
6. outer construction method of choosing structure according to claim 1, it is characterized in that, support system selects bottom temporary support moulding bed, and the slenderness ratio of bottom temporary support moulding bed controls within 150.
7. outer construction method of choosing structure according to claim 6, it is characterized in that, support system is installed and comprises: bottom temporary support moulding bed and ground adopt buried piece to be welded and fixed, and its degree control is at H/1000, and being not more than 10mm, H refers to the height of bottom temporary support moulding bed.
8. outer construction method of choosing structure according to claim 1, is characterized in that, installs the outer reinforced concrete column chosen inside structure and comprises: reinforced concrete column carries out segmentation according to a two-layer joint, and installing master control object is overhanging steel corbel.
9. outer construction method of choosing structure according to claim 1, it is characterized in that, install outer agent structure of choosing inside structure to comprise: the concrete of agent structure adopts placement layer by layer, builds thickness for every layer and is no more than 50cm, concrete wall body has the position of steel column to adopt symmetry to build.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111236554B (en) * | 2020-01-20 | 2022-02-11 | 湖南宝信云建筑综合服务平台股份有限公司 | One-step forming pouring method for cornice |
| CN111550060A (en) * | 2020-05-14 | 2020-08-18 | 广东粤能工程管理有限公司 | Construction method of overhanging steel pipe column |
| CN112065041B (en) * | 2020-09-08 | 2022-03-11 | 安徽工业大学 | Force and displacement double control-based large cantilever safe and intelligent construction system and method |
| CN115199031A (en) * | 2022-07-25 | 2022-10-18 | 江苏镇淮建设集团有限公司 | Method for supporting construction of large-span multilayer overhanging structure connecting column |
| CN115450314B (en) * | 2022-11-11 | 2023-03-24 | 中国建筑设计研究院有限公司 | Hollow cantilever structure |
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| GB566120A (en) * | 1943-05-11 | 1944-12-14 | Alexander Matheson Robertson | Improvements in and relating to the construction of houses and other buildings |
| CN101538896A (en) * | 2009-04-03 | 2009-09-23 | 标力建设集团有限公司 | Construction method for jettied structure at high attitude of high-rise building |
| CN102535845A (en) * | 2012-02-14 | 2012-07-04 | 浙江省建工集团有限责任公司 | Construction method of bearing frame of corridor structure |
| CN102966240A (en) * | 2012-11-30 | 2013-03-13 | 福建省第五建筑工程公司 | Construction method for high-altitude reinforced concrete outer cantilevered structure |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB566120A (en) * | 1943-05-11 | 1944-12-14 | Alexander Matheson Robertson | Improvements in and relating to the construction of houses and other buildings |
| CN101538896A (en) * | 2009-04-03 | 2009-09-23 | 标力建设集团有限公司 | Construction method for jettied structure at high attitude of high-rise building |
| CN102535845A (en) * | 2012-02-14 | 2012-07-04 | 浙江省建工集团有限责任公司 | Construction method of bearing frame of corridor structure |
| CN102966240A (en) * | 2012-11-30 | 2013-03-13 | 福建省第五建筑工程公司 | Construction method for high-altitude reinforced concrete outer cantilevered structure |
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