CN108775085A - The assembled integral concrete frame structure and its construction method of beam-ends connection - Google Patents
The assembled integral concrete frame structure and its construction method of beam-ends connection Download PDFInfo
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- CN108775085A CN108775085A CN201810742478.XA CN201810742478A CN108775085A CN 108775085 A CN108775085 A CN 108775085A CN 201810742478 A CN201810742478 A CN 201810742478A CN 108775085 A CN108775085 A CN 108775085A
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- prefabricated
- prefabricated post
- closure
- closed
- frame structure
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- 239000004567 concrete Substances 0.000 title claims abstract description 48
- 238000010276 construction Methods 0.000 title claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 61
- 239000010959 steel Substances 0.000 claims abstract description 61
- 210000003205 muscle Anatomy 0.000 claims abstract description 32
- 238000005266 casting Methods 0.000 claims abstract description 11
- 230000003014 reinforcing effect Effects 0.000 claims description 29
- 239000011440 grout Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 238000007596 consolidation process Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000002787 reinforcement Effects 0.000 description 10
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 9
- 244000046052 Phaseolus vulgaris Species 0.000 description 9
- 238000013461 design Methods 0.000 description 7
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
- E04B1/5825—Connections for building structures in general of bar-shaped building elements with a closed cross-section
- E04B1/5831—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially rectangular form
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/32—Columns; Pillars; Struts of metal
Abstract
Shear key and multiple closure reinforced steel bar rings is arranged in the connecting node both sides of prefabricated post in a kind of assembled integral concrete frame structure of beam-ends connection of the present invention, including precast beam and prefabricated post；Precast beam end set anti-shear concrete key, the prefabricated longitudinally disposed multiple closure U-shaped steel muscle of beam end, the closure U-shaped steel muscle of prefabricated beam-ends and closure reinforced steel bar ring cross-lapping or the uniform intervals arrangement of prefabricated post, are arranged the stirrup of precast beam, and in connecting portion casting concrete in connecting portion.The present invention effectively solves the problems, such as of the existing technology by designing position and the construction measure of the connection of prefabricated beam column component, while substantially reducing difficulty of construction.
Description
Technical field
The present invention relates to brick or concrete duct field, the assembled integral concrete frame structure of specifically a kind of beam-ends connection and
Its construction method.
Background technology
China puts into effect multinomial policy to promote the development of building industrialization, to meet the requirement of sustainable development at present.Dress
With formula concrete frame structure as a kind of structure type having a large capacity and a wide range, the large-scale popularization application in Practical Project, according to dress
Requirement with formula bean column node mechanical property the cast-in-place bean column node and the cast-in-place bean column node such as non-such as can be divided into, wait cast-in-place assembly
Formula bean column node is otherwise known as assembled integral bean column node, is received simultaneously gradually by vast design and construction first-line staff and society
It promotes and applies.Making and site operation of the assembly concrete frame structure in order to facilitate prefabricated components, generally respectively by coagulation
Earth pillar and beam are at the construction field (site) taken prefabricated beam column component in beam column node core area domain respectively as prefabricated components by reinforcing bar
It connects and is attached with rear pouring concrete, it is reasonable which splits, easily designed to apply
Work can greatly reduce the template and casting concrete workload of construction site.But this kind of connection type is needed in bean column node
Nucleus arrangement connection reinforcing bar and after-pouring concrete, since the vertical muscle of the both sides precast beam at bean column node core position does not connect
Pass through, and prefabricated post joint core region position there are conjunction old and new concret face, this is by strong influence assembled coagulation
The performance of native bean column node, moreover, because the stress in beam column node core area domain is complicated, undertake moment of flexure and shearing reassignment and
It transmits, especially in the application in middle high-intensity earthquake region, cannot such as meet the design concept of " strong node, weak component ", it will
The overall performance and anti-seismic performance of assembled integral concrete frame structure can be seriously affected, it is serious to hinder assembly concrete knot
Popularization and application of the structure in China.
Invention content
Goal of the invention：In order to overcome the deficiencies in the prior art, it is whole that the present invention provides a kind of assembly of beam-ends connection
Body formula concrete frame structure and its construction method.
Technical solution：In order to solve the above technical problems, a kind of assembled integral concrete frame of beam-ends connection of the present invention
Shear key and multiple closure reinforced steel bar rings is arranged in the connecting node both sides of prefabricated post in frame structure, including precast beam and prefabricated post；In advance
Beam end setting anti-shear concrete key processed, the prefabricated longitudinally disposed multiple closure U-shaped steel muscle of beam end, the closure of prefabricated beam-ends are U-shaped
The stirrup of precast beam is arranged in connecting portion in reinforcing bar and the closure reinforced steel bar ring cross-lapping or uniform intervals of prefabricated post arrangement, and
In connecting portion casting concrete.
Wherein, prefabricated post is multilayer prefabricated post or single layer prefabricated post.
Wherein, the length for being respectively closed reinforced steel bar ring stretching prefabricated post side is not less than 1.5-2 times of prefabricated deck-molding, is respectively closed reinforcing bar
Ring is bent to form by one whole reinforcing bar, and the overlapping part for being closed reinforced steel bar ring is set in prefabricated post.
Wherein, precast beam is composite beam, and reinforcing bar should be folded upward at by lower rebar and form close ring on beam at this time.
Wherein, the closure U-shaped steel muscle of prefabricated beam end is closed at middle part by the bending of top and the bottom reinforcing bar and forms close ring.
It is including following the present invention also provides a kind of construction method of the assembled integral concrete frame structure of beam-ends connection
Step：
S1：The lifting construction of multilayer prefabricated post is first carried out, prefabricated post is connected using column bottom grout sleeve, and interim branch is arranged
Support；
S2：Hoisting prefabricated beam from top to bottom, by the closure steel of the closure U-shaped steel muscle at precast beam both ends and corresponding prefabricated post
The form of muscle ring arranged crosswise, arrangement is overlap joint or uniform intervals arrangement, is closed U-shaped steel muscle and is closed the transverse end surface of reinforced steel bar ring
With precast beam and prefabricated post side distance 20mm；
S3：Stirrup is set in the join domain for the closure reinforced steel bar ring for being closed U-shaped steel muscle and prefabricated post, stirrup uses open stirrups
The form of muscle is simultaneously done the encryption process, and after the completion of waiting for stirrup arrangement, the scene of prefabricated components is completed in the junction casting concrete
Assembling construction；
S4：It is high by one using intensity in the concrete that the junction for the closure reinforced steel bar ring for being closed U-shaped steel muscle and prefabricated post pours
The pea gravel concreten of grade, vibration compacting in work progress；
S5：Floor slab construction is carried out, floor uses prefabricated superimposed sheet or cast-in-situ floor.
Advantageous effect：The invention has the advantages that：
By designing position and the construction measure of the connection of prefabricated beam column component, effectively solve the problems, such as it is of the existing technology,
Substantially reduce difficulty of construction simultaneously.
Description of the drawings
Fig. 1 is precast beam and prefabricated post connecting portion structural map；
Fig. 2 is the joint structure figure after precast beam is connected with prefabricated post；
Fig. 3 is precast beam lifting construction plan view；
Fig. 4 precast beams and prefabricated post connection structure diagram；
Fig. 5 is precast beam lifting construction stereochemical structure front view；
Fig. 6 precast beams and prefabricated column connected node construct stereochemical structure schematic elevation view；
Fig. 7 precast beams and prefabricated column connected node construct stereochemical structure side view.
In figure：1- prefabricated posts, 2- precast beams, 3- closure reinforced steel bar rings, 4- shear keies, 5- shear keies, 6- are closed U-shaped steel muscle,
7- precast beams and prefabricated post join domain, 8- precast beam overlapping layers, 9- stirrups, 10- precast beam lifting constructions direction.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.
As shown in figs. 1-7, the assembled integral concrete frame structure of a kind of beam-ends of the invention connection, including prefabricated post
1 and precast beam 2, at the precast concrete position of the beam column nucleus of prefabricated post 1, shear key 4,1 joint core of prefabricated post are set
The closure reinforced steel bar ring 3 of connection is stretched out in region；Precast beam 2 can be overlapping beam, 2 end set anti-shear concrete key of precast beam
5, the end levels arrangement of reinforcement of precast beam 2 is configured according to design requirement, and is docked to be formed after the reinforcing bar of levels is bent and be closed U
Steel bar 6, the connection reinforcing bar as prefabricated beam-ends connecting portion；In construction, the lifting construction from top to bottom of precast beam 2 will be pre-
3 cross-lapping of closure reinforced steel bar ring or the uniform intervals arrangement for being closed U-shaped reinforcing bar 6 and prefabricated post 1 of beam 2 processed, then in interconnecting piece
Position site setup stirrup 9, then casting concrete completion construction.Prefabricated post 1 can be multilayer prefabricated post or single layer prefabricated post, it is prefabricated
1 full casting concrete of column.
The length for being closed 1 side of the stretching prefabricated post of reinforced steel bar ring 3 is high not less than 1.5 times of precast beams 2, when prefabricated beam span is larger
When, i.e., span-depth radio is larger, and when being more than 1/12,3 length of closure reinforced steel bar ring of stretching is not less than 2 times of prefabricated deck-moldings；It is closed reinforced steel bar ring 3
It is bent to form by one whole reinforcing bar, and the overlapping part of reinforcing bar close ring, is arranged in the position of joint core region, is set to pre-
In column 1 processed.When the required connection area of reinforcement is larger to use the double-deck arrangement of reinforcement, inside and outside two traps can be set and close reinforced steel bar ring, at this point,
The length for being closed reinforced steel bar ring should be by the length computation of inner ring reinforcing bar.
For convenience of the construction of floor, precast beam 2 is designed as overlapping beam, and U-shaped steel muscle 6 is closed on precast beam 2 at this time answers
It is folded upward at by lower rebar and forms close ring, if you do not need to using composite beam, top and the bottom reinforcing bar can be bent to form and be closed U
Steel bar 6.The top and the bottom reinforcing bar of 2 end of precast beam should meet the design requirement of bearing capacity, when the area of reinforcement of top and the bottom reinforcing bar
When close, the form of symmetric reinforcement is preferably used, when the area of reinforcement difference of top and the bottom reinforcing bar is larger, should adjust and select reinforcing bar
Diameter ensures that the radical of top and the bottom reinforcing bar is identical.When the top and the bottom reinforcing bar area of reinforcement is larger, the form of boundling arrangement of reinforcement is preferably used
To facilitate the lifting construction of prefabricated components.When top and the bottom number of steel bars is more, when precast beam 2 is using the double-deck arrangement of reinforcement, inside and outside setting
The reinforced steel bar ring that two traps are closed, at this point, the length for being closed U-shaped steel muscle should be the length by inner ring reinforcing bar.
It is lifted when precast beam 2 and prefabricated post 1 need to be transported to construction site after prefabricated components complete according to design,
The lifting construction and setting temporary support of prefabricated post 1 are first carried out, then hoisting prefabricated beam 2 from top to bottom, by 2 end of precast beam
The closure reinforced steel bar ring 3 for being closed U-shaped steel muscle 6 and prefabricated post 1 is arranged in a crossed manner, and the form of arrangement can be the two overlap joint or uniform intervals cloth
It sets, the lateral ends for being closed U-shaped steel muscle 6 and closure reinforced steel bar ring 3 should be respectively at 3 lateral distance 20mm of prefabricated post 1 and precast beam.It closes
It closes U-shaped steel muscle 6 and is closed the junction setting stirrup 9 of reinforced steel bar ring 3, stirrup 9 is using the form of U-stirrups, the hoop of connecting portion
Muscle should be done the encryption process, and after the completion of waiting for stirrup arrangement, the connecting portion casting concrete in 2 end of precast beam completes prefabricated components
On-site consolidation construction.Cast-in-place concrete should use the pea gravel concreten of the high grade of intensity in work progress, in work progress
At the shear key for needing vibration compacting, especially 2 end of precast beam and the setting of 1 nucleus of prefabricated post, meanwhile, it should be specifically noted that
It is not disturbed during poured in place concrete and is closed U-shaped steel muscle 6 and closure reinforced steel bar ring 3.
The present invention also provides a kind of construction methods, specifically include following steps：
S1：The lifting construction of multilayer prefabricated post is carried out first, and the connection of prefabricated post 1 is connected using column bottom grout sleeve, hung
Check whether basis or lower floor's post reinforcing bar positioning to be connected are accurate, should adjust reinforcing bar when there is deviation before construction before dress construction
The connecting portion of position, the multilayer prefabricated post in addition to bottom column is arranged at the inflection point of column, also can be as needed in column bottom
It is attached, reliable temporary support is set after the completion of the construction of prefabricated post 1, is applied when meeting hoisting prefabricated beam 2 and floor slab construction
The requirement of work load；
S2：After waiting for 1 installation of prefabricated post, check whether the construction quality of prefabricated post 1 and positioning are accurate, wait for prefabricated
Column 1 connects the lifting that grouting material intensity in grout sleeve reaches beginning precast beam 2 after requirement.The lifting of precast beam 2 should be with layer
Unit, lifting direction are from top to down, as shown in figure 3, precast beam lifting construction direction 10, beam bottom after the completion of precast beam 2 lifts
Scaffold should be built as support, consider that bean column node needs cast-in-place concrete and floor slab construction etc., need to meet simultaneously and laterally apply
The requirement of work load.When 2 lifting construction of precast beam, the closure steel for ensuring that 1 node region of prefabricated post stretches out should be especially gone through
Muscle ring 3 and 2 closed end U-shaped steel 6 crossover locations of muscle of precast beam are accurate, and the lap of splice meets the requirement of regulation and bearing capacity, together
Shi Erzhe reinforcing bars should be overlapped mutually, if occurred without the case where overlap joint due to factors such as design and construction, should be protected between the two reinforcing bar
Gauge is from uniform, due to that should adjust reinforcement location in time when reinforcing bar is caused to deform for construction；
S3：After the completion of waiting for 2 lifting construction of precast beam, it is being closed reinforced steel bar ring 3 and 2 closed end U-shaped steel muscle 6 of precast beam intersection
Location arrangements stirrup 9 needs to carry out stirrup encryption herein, and stirrup encryption length should meet current design criteria to beam-ends hoop simultaneously
Muscle encrypts the requirement of length and the length of cast-in-place join domain；
S4：After the completion of the stirrup construction of construction site, in connecting portion casting concrete, the coagulation local product poured uses intensity
The pea gravel concreten of a grade grade higher than the concrete strength of precast beam 2 and prefabricated post 1, and the concrete poured should use nothing
The concrete of contraction or microdilatancy should ensure that when casting concrete vibrates and not disturb closure reinforced steel bar ring 3 and be closed U-shaped steel muscle 6, pours
It builds concrete and needs vibration compacting, at especially prefabricated Column border node and at beam-ends at shear key；
S5：After the completion of waiting for that precast beam 2 is constructed, floor slab construction is carried out, prefabricated superimposed sheet or cast-in-situ floor can be used in floor, complete
At the construction of assembly concrete frame.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of assembled integral concrete frame structure of beam-ends connection, it is characterised in that：Including precast beam and prefabricated post,
The connecting node both sides setting spill shear key of prefabricated post and multiple closure reinforced steel bar rings；Precast beam end set concrete spill is anti-
Cut key, the prefabricated longitudinally disposed multiple closure U-shaped steel muscle of beam end, the closure U-shaped steel muscle of prefabricated beam-ends and the closure steel of prefabricated post
The stirrup of precast beam is arranged in connecting portion in muscle ring cross-lapping or uniform intervals arrangement, and in connecting portion casting concrete.
2. the assembled integral concrete frame structure of beam-ends connection according to claim 1, it is characterised in that：Prefabricated post
For multilayer prefabricated post or single layer prefabricated post.
3. the assembled integral concrete frame structure of beam-ends connection according to claim 1, it is characterised in that：It is each to be closed
The length that reinforced steel bar ring stretches out prefabricated post side is not less than 1.5-2 times of prefabricated deck-molding, and each reinforced steel bar ring that is closed is bent by one whole reinforcing bar
It is formed, the overlapping part for being closed reinforced steel bar ring is set in prefabricated post.
4. the assembled integral concrete frame structure of beam-ends connection according to claim 1, it is characterised in that：Prefabricated post
The shear key of the side of node region and beam end setting spill, rear pouring concrete is convex, and node region is poured after can improving
Shear-carrying capacity.
5. the assembled integral concrete frame structure of beam-ends connection according to claim 1, it is characterised in that：Precast beam
For composite beam, reinforcing bar should be folded upward at by lower rebar and form close ring on beam at this time.
6. the assembled integral concrete frame structure of beam-ends connection according to claim 1, it is characterised in that：Precast beam
The closure U-shaped steel muscle of end is closed at middle part by the bending of top and the bottom reinforcing bar and forms close ring.
7. a kind of construction method of the assembled integral concrete frame structure of beam-ends connection, includes the following steps：
S1：The lifting construction of multilayer prefabricated post is first carried out, prefabricated post is connected using column bottom grout sleeve, and temporary support is arranged；
S2：Hoisting prefabricated beam from top to bottom, by the closure reinforced steel bar ring of the closure U-shaped steel muscle at precast beam both ends and corresponding prefabricated post
Arranged crosswise, the form of arrangement are overlap joint or uniform intervals arrangement, be closed U-shaped steel muscle and be closed the transverse end surface of reinforced steel bar ring in advance
The distance 20mm of beam processed and prefabricated post side；
S3：Stirrup is set in the join domain for the closure reinforced steel bar ring for being closed U-shaped steel muscle and prefabricated post, stirrup is using U-stirrups
Form is simultaneously done the encryption process, and after the completion of waiting for stirrup arrangement, the on-site consolidation of prefabricated components is completed in the junction casting concrete
Construction；
S4：The high grade of intensity is used in the concrete that the junction for the closure reinforced steel bar ring for being closed U-shaped steel muscle and prefabricated post pours
Pea gravel concreten, vibration compacting in work progress；
S5：Floor slab construction is carried out, floor uses prefabricated superimposed sheet or cast-in-situ floor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810742478.XA CN108775085A (en) | 2018-07-09 | 2018-07-09 | The assembled integral concrete frame structure and its construction method of beam-ends connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810742478.XA CN108775085A (en) | 2018-07-09 | 2018-07-09 | The assembled integral concrete frame structure and its construction method of beam-ends connection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108775085A true CN108775085A (en) | 2018-11-09 |
Family
ID=64029734
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| CN201810742478.XA Pending CN108775085A (en) | 2018-07-09 | 2018-07-09 | The assembled integral concrete frame structure and its construction method of beam-ends connection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109339226A (en) * | 2018-11-16 | 2019-02-15 | 华侨大学 | A kind of prefabricated assembling type reinforced concrete beam-column connection structure |
| CN109881777A (en) * | 2019-03-05 | 2019-06-14 | 山东建筑大学 | A kind of assembled high tenacity cement-base composite material bean column node |
| CN115404980A (en) * | 2022-08-09 | 2022-11-29 | 四川宇砼建材有限公司 | Novel UHPC-based precast concrete frame structure system and construction method thereof |
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| JP2010037911A (en) * | 2008-08-08 | 2010-02-18 | Shimizu Corp | Joint structure of concrete member end |
| CN103088920A (en) * | 2013-02-21 | 2013-05-08 | 华汇工程设计集团股份有限公司 | Pre-tensioning prestressed composite beam structural system and construction method thereof |
| CN105155683A (en) * | 2015-08-12 | 2015-12-16 | 四川省建筑设计研究院 | Prefabricated beam-column connection in prefabricated concrete buildings and construction method thereof |
| CN105863047A (en) * | 2016-05-10 | 2016-08-17 | 上海理工大学 | Prefabricated concrete beam column joint and construction method |
| CN208763209U (en) * | 2018-07-09 | 2019-04-19 | 东南大学 | The assembled integral concrete frame structure of beam-ends connection |
-
2018
- 2018-07-09 CN CN201810742478.XA patent/CN108775085A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010037911A (en) * | 2008-08-08 | 2010-02-18 | Shimizu Corp | Joint structure of concrete member end |
| CN103088920A (en) * | 2013-02-21 | 2013-05-08 | 华汇工程设计集团股份有限公司 | Pre-tensioning prestressed composite beam structural system and construction method thereof |
| CN105155683A (en) * | 2015-08-12 | 2015-12-16 | 四川省建筑设计研究院 | Prefabricated beam-column connection in prefabricated concrete buildings and construction method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109339226A (en) * | 2018-11-16 | 2019-02-15 | 华侨大学 | A kind of prefabricated assembling type reinforced concrete beam-column connection structure |
| CN109881777A (en) * | 2019-03-05 | 2019-06-14 | 山东建筑大学 | A kind of assembled high tenacity cement-base composite material bean column node |
| CN109881777B (en) * | 2019-03-05 | 2024-03-22 | 山东建筑大学 | Assembled high-toughness cement-based composite material beam column joint |
| CN115404980A (en) * | 2022-08-09 | 2022-11-29 | 四川宇砼建材有限公司 | Novel UHPC-based precast concrete frame structure system and construction method thereof |
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Application publication date: 20181109 |