CN103470036A - Overhanging structure construction method - Google Patents
Overhanging structure construction method Download PDFInfo
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- CN103470036A CN103470036A CN2013103962564A CN201310396256A CN103470036A CN 103470036 A CN103470036 A CN 103470036A CN 2013103962564 A CN2013103962564 A CN 2013103962564A CN 201310396256 A CN201310396256 A CN 201310396256A CN 103470036 A CN103470036 A CN 103470036A
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Abstract
The invention provides an overhanging structure construction method. The overhanging structure method includes the steps: 1), analyzing before construction so as to determine a load condition and analyzing three aspects of mode states, stable stress ratio of components and ultimate bearing capacity; 2), designing a support system; 3), mounting the support system; 4), mounting an overhanging structure, a steel reinforced column on the inner side of the overhanging structure and a major structure, a cantilever beam and a diagonal bracing of the overhanging structure; 5), demounting the support system. The overhanging structure construction method is simple in design, convenient to construct and low in cost. In addition, the condition is analyzed before the construction to determine maximum structural displacement and stress position under the most unfavorable condition combination, so that security status during the construction can be pre-controlled and security of the construction can be guaranteed.
Description
Technical field
The present invention relates to building field, relate in particular to a kind of outer job practices of choosing structure.
Background technology
Along with expanding economy, people are more and more higher to the requirement of building, not only require multiple functionally, and focus on the appearance and modeling of building.So, produced some large spans thereupon, encorbelmented greatly, the building of large space, the curved surface opposite sex etc.Cantilevered structure can be used for the change structure appearance and modeling, and it is divided into, and individual layer is encorbelmented and multilayer is encorbelmented.Usually, cantilevered structure adopts the measures such as whole lower support or top oblique pull to be installed, and after overall structure has been constructed, then cantilevered structure is carried out to the integral body unloading.The measure cost that this technique often drops into is huge, is unfavorable for the 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 simple in structure, cost is low, and the outer job practices of choosing structure of construction safety.
The present invention solves the problems of the technologies described above taked technical scheme to be:
A kind of outer job practices of choosing structure, this outer job practices of choosing structure comprises the steps:
Step 1: analyze before the construction work, to determine load case, and mode and component stability stress ratio, three aspects of ultimate bearing capacity are analyzed;
Step 2: design support system;
Step 3: support system is installed;
Step 4: the outer structure of choosing is installed, and it comprises installs outer reinforced concrete column and agent structure of choosing the structure inboard, and outer Cantilever Beams and the diagonal brace of choosing structure is installed;
Step 5: remove support system;
Wherein, structure is chosen in the installation in described step 4 outward Cantilever Beams and diagonal brace step also specifically comprise the steps:
Step a: the reinforced concrete column of choosing the structure inboard outward is mounted to 2 layers, 2 layers and 2 layers of following agent structure concrete strength reach designing requirement, first install and fix the temporary supporting moulding bed below 1 layer of top-hung outrigger end position, the outer Cantilever Beams of choosing 1 layer of top of structure is installed;
Step b: the diagonal brace on the Cantilever Beams of choosing 1 layer of top of structure outward is installed, outer 3～4 layers of reinforced concrete column choosing the structure inboard are installed simultaneously;
Step c: build the outer 3 layer main body structural concretes of choosing the structure inboard, after concrete strength reaches designing requirement, outer the choose structural element of 2 layers, structure and the Cantilever Beams on 2 layers of top are installed;
Steps d: the diagonal brace on the Cantilever Beams of choosing 2 layers of top of structure outward is installed, is built the outer 4 layer main body structural concretes of choosing the structure inboard;
Step e: choose structure outside keeping and constructed than the speed of the slow one deck of agent structure, choose structure outside making and be mounted to 4 layers.
In such scheme, choose that structure is welded below 4 layers and 4 layers outward and acceptance(check) after, remove support system.
In such scheme, further comprise the step of the superstructure that agent structure is installed after the dismounting support system.
In such scheme, after the superstructure of installation agent structure, further comprise 5 layers and above outer step of choosing structure are installed.
In such scheme, the computational methods of load FH are: FH=1.2(D+0.5L)+1.3E+0.5EV+0.28W, wherein, D is that dead load, L are that mobile load, E are that horizontal earthquake load, EV are that vertical seismic load, W are that wind carries.
In such scheme, support system is selected bottom temporary supporting moulding bed, and the slenderness ratio of bottom temporary supporting moulding bed is controlled in 150.
In such scheme, support system is installed and is comprised: bottom temporary supporting moulding bed and ground adopt buried piece to be welded and fixed, and its verticality is controlled at H/1000, and is not more than 10mm.
In such scheme, the outer reinforced concrete column of choosing the structure inboard is installed and is comprised: reinforced concrete column carries out segmentation according to a two-layer joint, and it is overhanging steel corbel that the master control object is installed.
In such scheme, outer agent structure of choosing the structure inboard is installed and comprises: the concrete of agent structure adopts placement layer by layer, builds thickness for every layer and is no more than 50cm, and the 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, can carry out pre-control to the safe condition in work progress, ensure the safety of construction operation.
The accompanying drawing explanation
Fig. 1 is the outer flow chart of choosing the job practices of structure provided by the invention.
The concrete structure schematic diagram that Fig. 2 to Fig. 8 is Fig. 1 job practices of choosing structure at home and abroad.
In figure: 1-reinforced concrete column, 2-bottom temporary supporting moulding bed, 3-agent structure, 4-Cantilever Beams, 5-diagonal brace.
The specific embodiment
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 job practices of choosing structure provided by the invention as shown in Figure 1 to Figure 8 shows the.
The job practices that should outer choose structure comprises the steps.
Step 1: analyze before the construction work, to determine load case, and mode and component stability stress ratio, three aspects of ultimate bearing capacity are analyzed.By Analysis deterrmination structure maximum displacement and stress position under the most unfavorable processing condition combination, as the design considerations of support system, and the zone 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, wherein, D is that dead load, L are that mobile load, E are that horizontal earthquake load, EV are that vertical seismic load, W are that wind carries.
Step 2: design support system.Usually, support system adopts lower support system or two kinds of forms of section's oblique pull support system, and concrete form can be chosen design feature and selected according to folded.The steady section bars such as main shaft symmetry are generally selected in cross section.When adopting the lower support system, generally only need the monolithic stability checking computations, slenderness ratio is controlled in 150.And top oblique pull support system tension, safety factor is controlled at more than 2, and the stress checking calculation ratio is controlled at below 0.5.In the present embodiment, support system adopts the lower support system, particularly, adopt bottom temporary supporting moulding bed 2, and the slenderness ratio of bottom temporary supporting moulding bed 2 is controlled in 150.
Step 3: prepare before construction.Usually, after the design support system, before construction, carry out preparation of construction, as comprise the making of braced structures, member site acceptance etc.
Step 4: support system is installed.In the present embodiment, should bury the steel embedded part underground at supporting point position before construction, as the tie point on support system and ground.Bottom temporary supporting moulding bed 2 adopts buried piece to be welded and fixed with ground, and its verticality is controlled at H/1000, and is not more than 10mm.
Step 5: the outer structure of choosing is installed, and it comprises installs outer reinforced concrete column 1 and agent structure 3 of choosing the structure inboard, and outer Cantilever Beams 4 and the diagonal brace 5 of choosing structure is installed.
In the present embodiment, the outer reinforced concrete column 1 of choosing the structure inboard is installed and is comprised: reinforced concrete column 1 carries out segmentation according to a two-layer joint, and it is overhanging steel corbel that the master control object is installed.
The Cantilever Beams 4 of structure is chosen in installation in the present embodiment outward and the concrete mounting method of diagonal brace 5 comprises the steps:
Step a: the reinforced concrete column 1 of choosing the structure inboard outward is mounted to 2 layers, 2 layers and 2 layers of following agent structure 3 concrete strength reach designing requirement, first install and fix temporary supporting moulding bed 2 below 1 layer of top-hung outrigger end position, the outer Cantilever Beams of choosing 1 layer of top of structure is installed;
Step b: the diagonal brace 5 on the Cantilever Beams of choosing 1 layer of top of structure outward is installed, outer 3～4 layers of reinforced concrete column 1 choosing the structure inboard are installed simultaneously;
Step c: build outer 3 layer main body structure 3 concrete of choosing the structure inboard, after concrete strength reaches designing requirement, outer the choose structural element of 2 layers, structure and the Cantilever Beams on 2 layers of top are installed;
Steps d: the diagonal brace 5 on the Cantilever Beams of choosing 2 layers of top of structure outward is installed, is built the outer 4 layer main body structural concretes of choosing the structure inboard;
Step e: choose structure outside keeping and constructed than the speed of the slow one deck of agent structure, choose structure outside making and be mounted to 4 layers.
Step 6: remove support system: choose that structure weld below 4 layers and 4 layers outward and acceptance(check) after, dismounting bottom temporary supporting moulding bed 2.
Step 7: the superstructure that agent structure is installed.
Step 8: 5 layers and the above outer structure of choosing are installed, and its concrete way and step 5 are basic identical, do not repeat them here.All outer choosing after structure installs, carry out an acceptance inspection.
In the present embodiment, choose outside in the work progress of structure, measure monitoring.Particularly, for cantilevered structure, the control of arch camber value is the dominant item of measuring.Every layer of cantilevered structure arranges a measuring control point, the distortion of for monitoring, encorbelmenting and holding.Measuring control point is chosen in the agent structure floor of the root of encorbelmenting, and avoids causing measure error because of foundation settlement.Every layer choose the structure installation outward after, in the termination of encorbelmenting, the self-adhesive type reflector plate is set in time, for detection of welding deformation and lower flexure strain.Before and after monitoring frequency changes according to the construction operating mode, each is surveyed once.When survey data is undergone mutation, should stop site operation and by notify items section.
Choose outward structure construction complete after, advance during welding for steel structure.Particularly, welding situation is divided into following several situation: on plane from inside to outside pointwise welded; Steel column after first diagonal brace on facade, avoid same rod part two ends to weld simultaneously; Node location is welded according to ,Hou top flange, first bottom flange; Position while welding is according to multi-pass welding, should clear up welding slag in time after often being soldered together and splash in surface, while finding to affect the defect of welding quality, after should removing, can weld again.Usually, welded after 24 hours and carried out Ultrasonic Nondestructive, that for ultrasonic wave, can't detect carries out radiographic inspection again.
Outer job practices simplicity of design of choosing structure provided by the invention, easy construction, cost is lower.And, carry out performance analysis before construction, determine structure maximum displacement and stress position under the most unfavorable processing condition combination, can carry out pre-control 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 or be equal to replacement technical scheme of the present invention, and do not break away from aim and the scope of technical solution of the present invention, and it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. a job practices of choosing structure outward, is characterized in that, described job practices comprises the steps:
Step 1: analyze before the construction work, to determine load case, and mode and component stability stress ratio, three aspects of ultimate bearing capacity are analyzed;
Step 2: design support system;
Step 3: support system is installed;
Step 4: the outer structure of choosing is installed, and it comprises installs outer reinforced concrete column and agent structure of choosing the structure inboard, and outer Cantilever Beams and the diagonal brace of choosing structure is installed;
Step 5: remove support system;
Wherein, structure is chosen in the installation in described step 4 outward Cantilever Beams and diagonal brace step also specifically comprise the steps:
Step a: the reinforced concrete column of choosing the structure inboard outward is mounted to 2 layers, 2 layers and 2 layers of following agent structure concrete strength reach designing requirement, first install and fix the temporary supporting moulding bed below 1 layer of top-hung outrigger end position, the outer Cantilever Beams of choosing 1 layer of top of structure is installed;
Step b: the diagonal brace on the Cantilever Beams of choosing 1 layer of top of structure outward is installed, outer 3～4 layers of reinforced concrete column choosing the structure inboard are installed simultaneously;
Step c: build the outer 3 layer main body structural concretes of choosing the structure inboard, after concrete strength reaches designing requirement, outer the choose structural element of 2 layers, structure and the Cantilever Beams on 2 layers of top are installed;
Steps d: the diagonal brace on the Cantilever Beams of choosing 2 layers of top of structure outward is installed, is built the outer 4 layer main body structural concretes of choosing the structure inboard;
Step e: choose structure outside keeping and constructed than the speed of the slow one deck of agent structure, choose structure outside making and be mounted to 4 layers.
2. outer job practices of choosing structure according to claim 1, is characterized in that, choose that structure weld below 4 layers and 4 layers outward and acceptance(check) after, the dismounting support system.
3. outer job practices of choosing structure according to claim 2, is characterized in that, further comprises the step of the superstructure that agent structure is installed after the dismounting support system.
4. outer job practices of choosing structure according to claim 3, is characterized in that, after the superstructure of installation agent structure, further comprises 5 layers and above outer step of choosing structure are installed.
5. outer job practices 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, wherein, D is that dead load, L are that mobile load, E are that horizontal earthquake load, EV are that vertical seismic load, W are that wind carries.
6. outer job practices of choosing structure according to claim 1, is characterized in that, support system is selected bottom temporary supporting moulding bed, and the slenderness ratio of bottom temporary supporting moulding bed is controlled in 150.
7. outer job practices of choosing structure according to claim 6, is characterized in that, support system is installed and comprised: bottom temporary supporting moulding bed and ground adopt buried piece to be welded and fixed, and its verticality is controlled at H/1000, and is not more than 10mm.
8. outer job practices of choosing structure according to claim 1, is characterized in that, the outer reinforced concrete column of choosing the structure inboard is installed and comprised: reinforced concrete column carries out segmentation according to a two-layer joint, and it is overhanging steel corbel that the master control object is installed.
9. outer job practices of choosing structure according to claim 1, it is characterized in that, outer agent structure of choosing the structure inboard is installed to be comprised: the concrete of agent structure adopts placement layer by layer, builds thickness for every layer and is no more than 50cm, and the concrete wall body has the position of steel column to adopt symmetry to build.
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| CN201310396256.4A CN103470036B (en) | 2013-09-04 | 2013-09-04 | A kind of outer construction method of choosing structure |
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| CN201310396256.4A CN103470036B (en) | 2013-09-04 | 2013-09-04 | A kind of outer construction method of choosing structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111236554A (en) * | 2020-01-20 | 2020-06-05 | 湖南宝家云建筑工程管理有限公司 | 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 |
| CN112065041A (en) * | 2020-09-08 | 2020-12-11 | 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 |
| CN115450314A (en) * | 2022-11-11 | 2022-12-09 | 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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2013
- 2013-09-04 CN CN201310396256.4A patent/CN103470036B/en active Active
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 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111236554A (en) * | 2020-01-20 | 2020-06-05 | 湖南宝家云建筑工程管理有限公司 | 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 |
| CN112065041A (en) * | 2020-09-08 | 2020-12-11 | 安徽工业大学 | Force and displacement double control-based large cantilever safe and intelligent construction system and method |
| 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 |
| CN115450314A (en) * | 2022-11-11 | 2022-12-09 | 中国建筑设计研究院有限公司 | Hollow cantilever structure |
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| CN103470036B (en) | 2016-02-03 |
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