CN105569263A - Full-assembly-type steel-prefabricated concrete floor slab combination beam and installing method thereof - Google Patents
Full-assembly-type steel-prefabricated concrete floor slab combination beam and installing method thereof Download PDFInfo
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- CN105569263A CN105569263A CN201610076467.3A CN201610076467A CN105569263A CN 105569263 A CN105569263 A CN 105569263A CN 201610076467 A CN201610076467 A CN 201610076467A CN 105569263 A CN105569263 A CN 105569263A
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- steel
- concrete floor
- prefabricated concrete
- guide groove
- compound beam
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Classifications
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- 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
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
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- 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
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
Abstract
The invention discloses a full-assembly-type steel-prefabricated concrete floor slab combination beam and an installing method thereof, and belongs to the field of buildings. The full-assembly-type steel-prefabricated concrete floor slab combination beam comprises a steel beam with an upper wing edge, a prefabricated concrete floor slab which is provided with a guide groove in an embedded mode, J-shaped fixtures and T-shaped fastening parts; the prefabricated concrete floor slab is arranged on the upper surface of the upper wing edge of the steel beam; each J-shaped fixture comprises a top cap, wherein the top cap is connected with a vertical connecting rod which is connected with a horizontal connecting rod, a sleeve with an inner thread is arranged at the tail end of the horizontal connecting rod, and the top cap stretches into the guide groove; each T-shaped fastening part comprises a frictional steel plate and a fastening screw arranged on the lower side of the frictional steel plate, wherein the fastening screw is screwed into the corresponding sleeve, and the frictional steel plate is closely attached to the lower surface of the upper wing edge of the steel beam. According to the full-assembly-type steel-prefabricated concrete floor slab combination beam and the installing method thereof, the construction efficiency is high, the cost is low, the environment cannot be polluted, installing is convenient, disassembly can be achieved, and floor slab replacing and recycling can be achieved.
Description
Technical field
The present invention relates to building field, refer to a kind of full assembled steel-prefabricated concrete floor compound beam and mounting method thereof especially.
Background technology
Steel-concrete composite beam is a kind of new structure pattern grown up on steel work and concrete structure basis.It mainly through arranging shear connector (peg, channel-section steel, curved muscle etc.) between girder steel and concrete floor, and both opposings start and Relative sliding interface place, makes it into as a whole and co-operation.
At present, conventional steel-concrete composite beam is steel-cast-in-place concrete floor compound beam and steel-superimposed integral concrete floor compound beam.
Steel-cast-in-place concrete floor compound beam is made up of girder steel, cast-in-place concrete floor and shear stud, has the advantages such as integral rigidity is large, compound action is remarkable, is applicable to the flooring of layout complexity.But there is following shortcoming: 1. wet trade amount is very large, causes efficiency of construction low, the high and contaminated environment of cost; 2. template and on-the-spot support many, reduce further efficiency of construction, improve cost; 3. namely girder steel and cast-in-place concrete floor are integrated after building, and cannot dismantle, and cause when the load of floor of existing structure increases, thick floor cannot be changed, when floor damages, the floor that cannot more renew, and floor can not recycle, and is not suitable for industrialization of construction industry.
Steel-superimposed integral concrete floor compound beam is made up of girder steel, superimposed integral concrete floor and shear stud, there is the advantages such as integral rigidity is large, compound action is remarkable equally, and scene saves template and portion support, increase compared to steel-cast-in-place concrete floor compound beam efficiency of construction.But still Shortcomings, be mainly manifested in: 1. scene still needs concreting to realize compound action, and wet trade is more, causes efficiency of construction low, the high and contaminated environment of cost; 2. composite deck slabs and steel bar girder concrete combined floor need install support when span is larger, and need prevent fires and preservative treatment at the bottom of plate, cost is higher; Prestressed concrete overlapped slab (flat board) and steel bar girder concrete folding plate need install support when span is greater than 1.8m, prestressed concrete overlapped slab with ribbing need install support when span is greater than 3.6m, reduce further efficiency of construction, improve cost; 3. namely girder steel and superimposed integral concrete floor are integrated after building, and cannot dismantle, and cause when the load of floor of existing structure increases, thick floor cannot be changed, when floor damages, the floor that cannot more renew, and floor can not recycle, and is not suitable for industrialization of construction industry.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of full assembled steel-prefabricated concrete floor compound beam and mounting method thereof, and efficiency of construction of the present invention is high, and cost is low, does not pollute the environment; Easy for installation, detachably, the replacing of floor can be realized and recycle.
For solving the problems of the technologies described above, the invention provides technical scheme as follows:
On the one hand, a kind of full assembled steel-prefabricated concrete floor compound beam is provided, comprises with the girder steel of top flange, the prefabricated concrete floor being embedded with guide groove, J type fixture and T-shaped securing member, wherein:
Described prefabricated concrete floor is arranged on the upper surface of described girder steel top flange;
Described J type fixture comprises top cap, and described top cap is connected with vertical link, and described vertical link is connected with waling stripe, and the end of described waling stripe offers tapped sleeve, and described top cap is stretched in described guide groove;
Described T-shaped securing member comprises friction steel plate and is arranged on the fastening screw on the downside of described friction steel plate, and described fastening screw is screwed in described sleeve, and described friction steel plate fits tightly the soffit in described girder steel top flange.
Further, ball pivot is provided with between described fastening screw and friction steel plate.
Further, described T-shaped securing member also comprises nut, and described fastening screw lower end also comprises the circular hole for inserting spanner.
Further, the plane that described waling stripe determines perpendicular to described top cap and described vertical link, or described waling stripe is positioned at the plane of described top cap and the decision of described vertical link.
Further, described guide groove is C-type steel guide groove, and described C-type steel guide groove and described prefabricated concrete floor pass through anchor connection.
Further, described girder steel is T-steel beam, steel beam with box shape or H profile steel beam, and described prefabricated concrete floor comprises prefabricating common concrete floor, precast prestressed concrete floor or precast prestressed hollow concrete building floor.
Further, described prefabricated concrete floor is multiple, and adjacent two prefabricated concrete floors are connected by tongue and groove mode.
Further, described J type fixture and T-shaped securing member are two, lay respectively at the both sides of described girder steel top flange.
Further, the material of described J type fixture is common iron or high-strength steel, and described T-shaped securing member material is steel.
On the other hand, a kind of mounting method of above-mentioned full assembled steel-prefabricated concrete floor compound beam is provided, comprises:
Step 1: install girder steel;
Step 2: prefabricated concrete floor is shelved on girder steel top flange upper surface;
Step 3: T-shaped securing member is screwed into from top to bottom in the sleeve of J type fixture, and adjust it and highly arrive correct position;
Step 4: the top cap of J type fixture is stretched in the guide groove in prefabricated concrete floor, then half-twist;
Step 5: upwards tightened by T-shaped securing member, makes the soffit of friction steel plate and girder steel top flange fit tightly, and produces reliable frictional force.
The present invention has following beneficial effect:
First, the all parts (especially prefabricated concrete floor) of steel of the present invention-prefabricated concrete floor compound beam is produce in factory and completes, and without the need to poured in place concrete wet trade, makes efficiency of construction high, decrease cost, and do not pollute the environment.
Then, steel of the present invention-prefabricated concrete floor compound beam, when constructing, without the need to template and on-the-spot support, further increases efficiency of construction, reduces cost; Further, inventor also finds, the present invention does not need arranging peg on girder steel, and low further cost, improves efficiency of construction.
Further, steel of the present invention-prefabricated concrete floor compound beam when mounted, only needs fastening screw to be screwed in sleeve, and stretches in guide groove by top cap, finally tighten fastening screw, otherwise during dismounting, make installation and removal fast and easy.And because girder steel and prefabricated concrete floor are detachable, when the load of floor of existing structure is increased, thick floor can be changed, when floor damages, the floor that can more renew, and floor can recycle, and achieves industrialization of construction industry.
Finally, steel of the present invention-prefabricated concrete floor compound beam is installed firmly, superior performance.
In sum, steel of the present invention-prefabricated concrete floor compound beam efficiency of construction is high, and cost is low, does not pollute the environment; Easy for installation, detachably, the replacing of floor can be realized and recycle.
Accompanying drawing explanation
Fig. 1 is the front view of an embodiment of full assembled steel-prefabricated concrete floor compound beam of the present invention;
Fig. 2 is the right view of an embodiment of full assembled steel-prefabricated concrete floor compound beam of the present invention;
Fig. 3 is the stereogram of an embodiment of J type fixture in the present invention;
Fig. 4 is the front view of an embodiment of T-shaped securing member in the present invention;
Fig. 5 is the front view of another embodiment of J type fixture in the present invention;
Fig. 6 is the front view of another embodiment of full assembled steel-prefabricated concrete floor compound beam of the present invention.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
On the one hand, the invention provides a kind of full assembled steel-prefabricated concrete floor compound beam, one of them embodiment as shown in Figures 1 to 4, comprises with the girder steel 1 of top flange 101, the prefabricated concrete floor 2 being embedded with guide groove 3, J type fixture 4 and T-shaped securing member 5, wherein:
Prefabricated concrete floor 2 is arranged on the upper surface of girder steel top flange 101;
J type fixture 4 comprises top cap 6, and top cap 6 is connected with vertical link 7, and vertical link 7 is connected with waling stripe 8, and the end of waling stripe 8 offers tapped sleeve 9, and top cap 6 is stretched in guide groove 3;
T-shaped securing member 5 comprises friction steel plate 10 and is arranged on fastening screw 12 on the downside of friction steel plate 10, and fastening screw 12 is screwed in sleeve 9, and friction steel plate 10 fits tightly the soffit in girder steel top flange 101.
The girder steel of the steel-prefabricated concrete floor compound beam of the embodiment of the present invention is connected with T-shaped securing member by J type fixture with prefabricated concrete floor, concrete, the friction steel plate of T-shaped securing member is fitted tightly the soffit in girder steel top flange by J type fixture, by pressure and frictional force, girder steel and prefabricated concrete floor is fixed together.
The present invention has following beneficial effect:
First, the all parts (especially prefabricated concrete floor) of the steel-prefabricated concrete floor compound beam of the embodiment of the present invention is produce in factory and completes, and without the need to poured in place concrete wet trade, makes efficiency of construction high, decrease cost, and do not pollute the environment.
Then, the steel-prefabricated concrete floor compound beam of the embodiment of the present invention, when constructing, without the need to template and on-the-spot support, further increases efficiency of construction, reduces cost; Further, inventor also finds, the present invention does not need arranging peg on girder steel, and low further cost, improves efficiency of construction.
Further, steel-prefabricated concrete floor the compound beam of the embodiment of the present invention when mounted, fastening screw is only needed to be screwed in sleeve, and top cap is stretched in guide groove, finally tighten fastening screw, otherwise it is not during dismounting, make installation and removal fast and easy, and high to the required precision of installing.And because girder steel and prefabricated concrete floor are detachable, when the load of floor of existing structure is increased, thick floor can be changed, when floor damages, the floor that can more renew, and floor can recycle, and achieves industrialization of construction industry.
Finally, the steel-prefabricated concrete floor compound beam of the embodiment of the present invention is installed firmly, superior performance.
In sum, the steel-prefabricated concrete floor compound beam efficiency of construction of the embodiment of the present invention is high, and cost is low, does not pollute the environment; Easy for installation, detachably, the replacing of floor can be realized and recycle.
One as the embodiment of the present invention is improved, and is provided with ball pivot 11 between fastening screw 12 and friction steel plate 10.
Ball pivot can ensure prefabricated concrete floor soffit and girder steel top flange soffit not perfect parallelism (or planeness is undesirable) time, friction steel plate and girder steel top flange soffit still can be adjacent to, and meet required reliable frictional power.
Further, T-shaped securing member 4 also comprises nut 15, and nut is screwed in fastening screw lower end, prevents T-shaped securing member from loosening; Fastening screw 12 lower end also comprises the circular hole 13 for inserting spanner 14, can insert spanner easily, rotates fastening screw.
The structure of T-shaped securing member can have multiple, provides two embodiments here:
Embodiment 1:
The plane that waling stripe 8 determines perpendicular to top cap 6 and vertical link 7, as shown in Figure 3, now, the length direction of guide groove perpendicular to the length direction of girder steel, namely along prefabricated concrete floor length direction, can along the elongated layout of floor, also can step-by-step arrangement.
Embodiment 2:
Waling stripe 8 ' is positioned at the plane that top cap 6 ' determines with vertical link 7 ', and as shown in Figure 5, now, the length direction of guide groove is parallel to the length direction of girder steel, namely along prefabricated concrete floor width.
Another kind as the embodiment of the present invention improves, in the full assembled steel-prefabricated concrete floor compound beam of the embodiment of the present invention, guide groove can have numerous embodiments, preferably, as shown in Figure 2, guide groove 3 is C-type steel guide groove, and C-type steel guide barrel construction is simple, in order to make C-type steel guide groove and prefabricated concrete floor be connected firmly, C-type steel guide groove and prefabricated concrete floor pass through anchor connection.
Further, in the full assembled steel-prefabricated concrete floor compound beam of the embodiment of the present invention, girder steel can have numerous embodiments, and such as, girder steel 1 can be T-steel beam, comprises top flange and web; Or girder steel 1 can be steel beam with box shape, comprises overhanging top flange, web and bottom flange; Or girder steel 1 can be H profile steel beam, as shown in Figure 1, comprise top flange 101, web 102 and bottom flange 103; Prefabricated concrete floor can realize multispan arrange and without the need to disconnect, produce in factory is simple, install more quick, manufacture and installation cost is low, and prefabricated concrete floor includes but not limited to prefabricating common concrete floor, precast prestressed concrete floor or precast prestressed hollow concrete building floor.
Preferably, prefabricated concrete floor can be multiple, and adjacent two prefabricated concrete floors are connected by tongue and groove mode.The width of prefabricated concrete floor and span can modularizations, and take into account the demand of transport aspect, connected between prefabricated concrete floor by tongue and groove mode.If desired, laterally can apply horizontal prestressing force along prefabricated concrete floor, increase the keying strength at tongue and groove place between prefabricated concrete floor and frictional force.
To be J type fixture and T-shaped securing member the be situation of 1 of above-mentioned introduction, J type fixture and T-shaped securing member can be two, as shown in Figure 6, lay respectively at the both sides of girder steel top flange, increase pressure and frictional force, install more firm.
In order to meet the intensity of all parts, the material of J type fixture is common iron or high-strength steel, and T-shaped securing member material is steel.
On the other hand, the invention provides a kind of mounting method of above-mentioned full assembled steel-prefabricated concrete floor compound beam, one of them embodiment comprises:
Step 1: install girder steel; Concrete, install the girder steel (containing overhanging top flange) of H profile steel beam, T-steel beam, steel beam with box shape or other cross section type, wherein top flange is above web.
Step 2: prefabricated concrete floor is shelved on girder steel top flange upper surface.
Step 3: the fastening screw of T-shaped securing member is screwed into from top to bottom in the sleeve of J type fixture, and adjust it and highly arrive correct position.
Step 4: the top cap of J type fixture is stretched into (preferred C-type steel guide groove) in the guide groove in prefabricated concrete floor, then half-twist.
Step 5: upwards tightened by T-shaped securing member, makes the soffit of friction steel plate and girder steel top flange fit tightly, and produces reliable frictional force.
Further, when T-shaped securing member comprises ball pivot and circular hole, this step is preferably: spanner is inserted circular hole, rotary spanner, upwards tightened by fastening screw, period constantly adjusts ball pivot and friction steel plate, and the soffit of friction steel plate and girder steel top flange is fitted tightly, and produce reliable frictional force, become an entirety.
Further, when T-shaped securing member comprises nut, also comprise step 6: nut is screwed into fastening screw from the bottom up, and tighten.
The mounting method of the embodiment of the present invention has following advantage:
1., without the need to poured in place concrete wet trade, make efficiency of construction high, decrease cost, and do not pollute the environment.
2., without the need to template and on-the-spot support, further increase efficiency of construction, reduce cost.
3. during construction only need fastening screw to be screwed in sleeve, and top cap is stretched in guide groove, finally tighten fastening screw, otherwise during dismounting, make installation and removal fast and easy, and not high to the required precision of installing.
4. and due to girder steel and prefabricated concrete floor detachable, when the load of floor of existing structure is increased, thick floor can be changed, when floor damages, the floor that can more renew, and floor can recycle, and achieves industrialization of construction industry.
5. the embodiment of the present invention is installed firmly, superior performance.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. full assembled steel-prefabricated concrete floor compound beam, is characterized in that, comprises with the girder steel of top flange, the prefabricated concrete floor being embedded with guide groove, J type fixture and T-shaped securing member, wherein:
Described prefabricated concrete floor is arranged on the upper surface of described girder steel top flange;
Described J type fixture comprises top cap, and described top cap is connected with vertical link, and described vertical link is connected with waling stripe, and the end of described waling stripe offers tapped sleeve, and described top cap is stretched in described guide groove;
Described T-shaped securing member comprises friction steel plate and is arranged on the fastening screw on the downside of described friction steel plate, and described fastening screw is screwed in described sleeve, and described friction steel plate fits tightly the soffit in described girder steel top flange.
2. full assembled steel-prefabricated concrete floor compound beam according to claim 1, is characterized in that, be provided with ball pivot between described fastening screw and friction steel plate.
3. full assembled steel-prefabricated concrete floor compound beam according to claim 2, is characterized in that, described T-shaped securing member also comprises nut, and described fastening screw lower end also comprises the circular hole for inserting spanner.
4. full assembled steel-prefabricated concrete floor compound beam according to claim 1, it is characterized in that, the plane that described waling stripe determines perpendicular to described top cap and described vertical link, or described waling stripe is positioned at the plane of described top cap and the decision of described vertical link.
5. full assembled steel-prefabricated concrete floor compound beam according to claim 1, is characterized in that, described guide groove is C-type steel guide groove, and described C-type steel guide groove and described prefabricated concrete floor pass through anchor connection.
6. full assembled steel-prefabricated concrete floor compound beam according to claim 1, it is characterized in that, described girder steel is T-steel beam, steel beam with box shape or H profile steel beam, and described prefabricated concrete floor comprises prefabricating common concrete floor, precast prestressed concrete floor or precast prestressed hollow concrete building floor.
7. full assembled steel-prefabricated concrete floor compound beam according to claim 6, is characterized in that, described prefabricated concrete floor is multiple, and adjacent two prefabricated concrete floors are connected by tongue and groove mode.
8., according to the arbitrary described full assembled steel-prefabricated concrete floor compound beam of claim 1-7, it is characterized in that, described J type fixture and T-shaped securing member are two, lay respectively at the both sides of described girder steel top flange.
9. full assembled steel-prefabricated concrete floor compound beam according to claim 8, is characterized in that, the material of described J type fixture is common iron or high-strength steel, and described T-shaped securing member material is steel.
10. the mounting method of the full assembled steel-prefabricated concrete floor compound beam described in claim 1-9, is characterized in that, comprising:
Step 1: install girder steel;
Step 2: prefabricated concrete floor is shelved on girder steel top flange upper surface;
Step 3: T-shaped securing member is screwed into from top to bottom in the sleeve of J type fixture, and adjust it and highly arrive correct position;
Step 4: the top cap of J type fixture is stretched in the guide groove in prefabricated concrete floor, then half-twist;
Step 5: upwards tightened by T-shaped securing member, makes the soffit of friction steel plate and girder steel top flange fit tightly, and produces reliable frictional force.
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Cited By (11)
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| CN106968180A (en) * | 2017-04-20 | 2017-07-21 | 崔冰 | A kind of dry type connection method of the concrete slab and girder steel of steel reinforced concrete combination beam |
| CN109296209A (en) * | 2018-11-10 | 2019-02-01 | 河北建设集团股份有限公司 | A kind of steel bar truss floor support plate fitting fastening |
| CN109296210A (en) * | 2018-11-10 | 2019-02-01 | 河北建设集团股份有限公司 | A kind of bed die detachable reinforcing steel truss floor support plate fitting fastening |
| CN109306758A (en) * | 2018-11-01 | 2019-02-05 | 沈阳建筑大学 | Prefabricated plate superposed type floor connector and preparation method thereof and construction method |
| CN109487941A (en) * | 2018-11-10 | 2019-03-19 | 河北建设集团股份有限公司 | A kind of steel bar truss floor support plate |
| CN110469052A (en) * | 2019-08-20 | 2019-11-19 | 北京市政路桥管理养护集团有限公司 | Steel-concrete composite beam connector, steel-concrete composite beam and manufacturing method |
| CN110741125A (en) * | 2017-06-01 | 2020-01-31 | 艾迪奇股份公司 | Flat building element, in particular for producing a horizontal building structure |
| CN112411877A (en) * | 2020-11-04 | 2021-02-26 | 上海市建筑科学研究院有限公司 | Steel-concrete combined structure shear connector, construction method and shear combined structure |
| CN113007451A (en) * | 2021-03-23 | 2021-06-22 | 中国五冶集团有限公司 | Conversion connecting buckle for I-shaped steel structure beam |
| CN114482374A (en) * | 2022-04-15 | 2022-05-13 | 中冶建筑研究总院有限公司 | Integrally-assembled steel-concrete composite beam connecting joint |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106968180A (en) * | 2017-04-20 | 2017-07-21 | 崔冰 | A kind of dry type connection method of the concrete slab and girder steel of steel reinforced concrete combination beam |
| CN106968180B (en) * | 2017-04-20 | 2019-03-22 | 崔冰 | A kind of dry type connection method of the concrete slab and girder steel of the mixed combination beam of steel- |
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| CN109306758A (en) * | 2018-11-01 | 2019-02-05 | 沈阳建筑大学 | Prefabricated plate superposed type floor connector and preparation method thereof and construction method |
| CN109296209A (en) * | 2018-11-10 | 2019-02-01 | 河北建设集团股份有限公司 | A kind of steel bar truss floor support plate fitting fastening |
| CN109296210A (en) * | 2018-11-10 | 2019-02-01 | 河北建设集团股份有限公司 | A kind of bed die detachable reinforcing steel truss floor support plate fitting fastening |
| CN109487941A (en) * | 2018-11-10 | 2019-03-19 | 河北建设集团股份有限公司 | A kind of steel bar truss floor support plate |
| CN110469052A (en) * | 2019-08-20 | 2019-11-19 | 北京市政路桥管理养护集团有限公司 | Steel-concrete composite beam connector, steel-concrete composite beam and manufacturing method |
| CN112411877A (en) * | 2020-11-04 | 2021-02-26 | 上海市建筑科学研究院有限公司 | Steel-concrete combined structure shear connector, construction method and shear combined structure |
| CN113007451A (en) * | 2021-03-23 | 2021-06-22 | 中国五冶集团有限公司 | Conversion connecting buckle for I-shaped steel structure beam |
| CN114482374A (en) * | 2022-04-15 | 2022-05-13 | 中冶建筑研究总院有限公司 | Integrally-assembled steel-concrete composite beam connecting joint |
| CN114809282A (en) * | 2022-04-29 | 2022-07-29 | 中国建筑第八工程局有限公司 | I-shaped steel and concrete constructional column connecting joint and construction method thereof |
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| CN105569263B (en) | 2017-07-14 |
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