CN103758347B - Large-span RC girder plated construction late poured band support underpinning construction method - Google Patents
Large-span RC girder plated construction late poured band support underpinning construction method Download PDFInfo
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- CN103758347B CN103758347B CN201410025862.XA CN201410025862A CN103758347B CN 103758347 B CN103758347 B CN 103758347B CN 201410025862 A CN201410025862 A CN 201410025862A CN 103758347 B CN103758347 B CN 103758347B
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Abstract
The invention provides a kind of large-span RC girder plated construction late poured band support underpinning construction method, mainly comprise the following steps: 1. build ater-casting in advance, 2. basic built-in fitting is set, 3. prepares steel lattice column, 4. steel lattice column is installed, 5. removes ater-casting concrete that former steel pipe scaffold support system, 6. clear cutter build in advance, 7. power transmission girder steel is set.The present invention's employing shifts to an earlier date concreting and carries out reinforcement on ater-casting, then carry out removing again to sink after support underpins to position, ater-casting by steel lattice column, the ater-casting steel pipe scaffold support system of the problems such as distortion or distortion, the concrete engineering method that ater-casting is built is cut again after support replacement completes, for large span ater-casting steel pipe scaffold support system sinks, distortion, a kind of economical and convenient is provided during twisted phenomena, safe and reliable and practical solution, effective solution invar pipe scaffold support system sinks, distortion, the unsafe factor that distortion brings.
Description
Technical field
The present invention relates to the construction Technique of Late Poured Band field in building, be specifically related to a kind of large-span RC girder plated construction late poured band support underpinning construction method.
Background technology
In building construction process, often need reserved ater-casting.So-called ater-casting refers to that reserves in the structures such as beam, plate (comprising sole plate), wall has one fixed width and the concrete belt of building again after certain hour for factor impacts such as the variations in temperature that conforms, concrete shrinkage, structure differential settlements.Ater-casting generally includes pouring after settlement, temperature post-cast strip and post-concreted expansion strip: water construction band after arranging and be called pouring after settlement for solving the differential settlement of highrise building main tower and annex; Water construction band for preventing concrete after arranging because of variations in temperature drawing crack and be called temperature post-cast strip; For preventing because building area is excessive, to water constuction joint after arranging because of variations in temperature and concrete shrinkage cracking be post-concreted expansion strip to structure.Must stay during the construction of large-span RC girder plated construction and establish ater-casting, its ater-casting is generally pouring after settlement and temperature post-cast strip.The position, ater-casting of indwelling adopts steel pipe scaffold support system to support usually.But in Construction practices, the phenomenons such as the steel pipe scaffold support system of ater-casting may sink, be out of shape, distortion, position, ater-casting is supported firm not, bring unsafe factor on the one hand, also can have influence on large-span RC girder plated construction on the other hand and sink, be out of shape and cracking.
Summary of the invention
The object of the invention is: for produced problem in practice, provide a kind of economical and convenient, safe and reliable, adopt ater-casting to shift to an earlier date concreting and replace the large-span RC girder plated construction late poured band support underpinning construction method of steel pipe scaffold support system of distortion with steel lattice column.
Technical scheme of the present invention is: large-span RC girder plated construction late poured band support underpinning construction method of the present invention, mainly comprises the following steps:
1. ater-casting is built in advance: first the both sides of the ater-casting that each layer reinforced concrete girder slab beyond top layer ater-casting is reserved are removed to foreign material and carried out dabbing; Then increase by designing requirement under the prerequisite that original reinforcing bar does not cut off on ater-casting and join reinforcing bar; Adopt two degree, neat slurry brush again; Finally build closely knit in time with carrying higher leveled expansive concrete than design strength grade; Carry out maintenance after ater-casting concreting completes, curing time is not less than 14 days;
2. basic built-in fitting is set: be bolted on the floorslab concrete girder of the both sides of ater-casting of the ground base base plate of building and the both sides of the ater-casting except top layer and arrange basic built-in fitting;
3. prepare steel lattice column: according to design height, the on-the-spot standard knot forming steel lattice column that utilizes is connected by stiffener high-strength bolt, assembles each steel lattice column of each floor support replacement;
4. steel lattice column is installed: by the lifting of each steel lattice column, makes each steel lattice column by the basic built-in fitting vertical connection of its lower end and relevant position and weld; By fastening voussoir wedging between the upper end of each steel lattice column and corresponding floorslab concrete girder;
5. remove former steel pipe scaffold support system: after the acceptance(check) of steel lattice column support replacement, remove the steel pipe scaffold support system of original ater-casting;
6. the clear cutter ater-casting concrete of building in advance: after support replacement completes, by the concrete chisel removal that each layer ater-casting is built in advance;
7. power transmission girder steel is set: in the middle of position, ater-casting between the top floor concrete girder of not constructed, pre-buried power transmission girder steel is as force-transmitting block with after forming common stress system, continues the follow-up normal construction carrying out building on top layer.
The present invention has positive effect: (1) large-span RC girder plated construction of the present invention late poured band support underpinning construction method, adopt the sedimentation reserved in large-span RC girder plated construction, in temperature post-cast strip, concreting carries out reinforcement in advance, then carry out removing again to sink after support underpins to position, ater-casting by steel lattice column, the ater-casting steel pipe scaffold support system of the problems such as distortion or distortion, the concrete engineering method that ater-casting is built is cut again after support replacement completes, for large span ater-casting steel pipe scaffold support system sinks, distortion, a kind of economical and convenient is provided during twisted phenomena, safe and reliable and practical solution.(2) large-span RC girder plated construction late poured band support underpinning construction method of the present invention, effectively can solve that invar pipe scaffold support system sinks, is out of shape, distortion time position, ater-casting support the harmful effect such as the unsafe factor not firmly brought and the sinking that reinforced concrete beam and plate is brought, distortion and cracking, ensure the complete and safety of building structure.
Accompanying drawing explanation
Fig. 1 is that steel lattice column of the present invention supports facade layout schematic diagram;
Fig. 2 is that steel lattice column supporting plane of the present invention arranges schematic diagram, also show the steel pipe scaffold support system not yet removed in figure;
Fig. 3 is the flow chart of construction method of the present invention.
Reference numeral in above-mentioned accompanying drawing is as follows:
Ground base base plate 1,
Basis built-in fitting 2,
Steel lattice column 3,
Fastening voussoir 4,
Floorslab concrete girder 5,
Top floor concrete girder 6,
Power transmission girder steel 7,
Ater-casting 8,
Steel pipe scaffold support system 9.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
(embodiment 1)
The large-span RC girder plated construction late poured band support underpinning construction method of the present embodiment, be applicable to the steel pipe scaffold support system sinking of large-span concrete beam and slab structure ater-casting, distortion, the concrete structure of distortion in controlled range, concrete beam and plate sinks distortion without obvious crack, distortion, there is no obvious differential settlement, if should before prestressing force does not have stretch-draw during prestress concrete girder slab structure, other similar structures also can refer to the construction of this engineering method.
The large-span RC girder plated construction late poured band support underpinning construction method of the present embodiment, large-span concrete beam and slab structure is utilized to stay the ater-casting of establishing to shift to an earlier date concreting enclosed beam plated construction in advance, make beam slab concrete structure form primary structure member, the load of deadweight and top transmission can be born; After ater-casting concreting completes and reaches design strength, adopt steel lattice column to carry out position, ater-casting support replacement, remove steel pipe scaffold support system.
See Fig. 1 and Fig. 2, section form is adopted to be that the lattice column standard knot of 800 × 800mm that 4 Φ 159 × 7mm steel columns are formed with chord member web member L63 × 5mm is connected and forms in steel lattice column 3 the present embodiment, each standard knot, at the stiffener adding Φ 319 diameter 10*125*80 up and down respectively of its steel column Φ 159 × 7, adopts 8M20 × 75 high-strength bolt to connect by its stiffener between each standard knot.The high computational of the beam slab that the quantity of the standard knot of steel lattice column 3 supports required for it is determined.
The girder steel of H300 × 300 × 10 × 15mm model is adopted in built-in fitting 2 the present embodiment of basis.
Steel plate wedge is adopted in fastening voussoir 4 the present embodiment.H profile steel is adopted in power transmission girder steel 7 the present embodiment.
See Fig. 3, the large-span RC girder plated construction late poured band support underpinning construction method of the present embodiment, mainly comprises the following steps:
1. ater-casting is built in advance: first the both sides of the ater-casting 8 that each layer reinforced concrete girder slab beyond top layer ater-casting is reserved are removed to foreign material and carried out dabbing; Then increase by designing requirement under the prerequisite that original reinforcing bar does not cut off on ater-casting 8 and join reinforcing bar; Adopt two degree, neat slurry brush again; Finally build closely knit in time with carrying higher leveled expansive concrete than design strength grade; Carry out maintenance after ater-casting concreting completes, curing time is not less than 14 days;
2. basic built-in fitting is set: be bolted on the floorslab concrete girder 5 of the both sides of the both sides of the ater-casting 8 of the ground base base plate 1 of building and the ater-casting 8 except top layer and arrange basic built-in fitting 2;
3. prepare steel lattice column: according to design height, the on-the-spot standard knot forming steel lattice column that utilizes is connected by stiffener high-strength bolt, assembles each steel lattice column 3 of each floor support replacement;
4. steel lattice column is installed: lifted by each steel lattice column 3, each steel lattice column 3 is welded with corresponding basic built-in fitting 2 vertical connection by its lower end; By the wedging of fastening voussoir 4 between the upper end and corresponding floorslab concrete girder 5 of each steel lattice column 3;
5. former steel pipe scaffold support system is removed: after the acceptance(check) of each steel lattice column 3 support replacement, remove the steel pipe scaffold support system 9 of original ater-casting 8;
6. the clear cutter ater-casting concrete of building in advance: after support replacement completes, by the concrete chisel removal that each layer ater-casting 8 is built in advance.
7. power transmission girder steel is set: in the middle of position, ater-casting 8 between the top floor concrete girder 6 of not constructed, pre-buried power transmission girder steel 7 is as force-transmitting block with after forming common stress system, continues the follow-up normal construction carrying out building on top layer.
Above embodiment is the explanation to the specific embodiment of the present invention; but not limitation of the present invention; person skilled in the relevant technique without departing from the spirit and scope of the present invention; can also make various conversion and change and obtain corresponding equivalent technical scheme, therefore all equivalent technical schemes all should be included into scope of patent protection of the present invention.
Claims (1)
1. a large-span RC girder plated construction late poured band support underpinning construction method, is characterized in that: comprise the following steps:
1. ater-casting is built in advance: first the both sides of the ater-casting (8) that each layer reinforced concrete girder slab beyond top layer ater-casting is reserved are removed to foreign material and carried out dabbing; Then under ater-casting (8) prerequisite that above original reinforcing bar does not cut off, reinforcing bar is joined by designing requirement increasing; Adopt two degree, neat slurry brush again; Finally build closely knit in time with carrying higher leveled expansive concrete than design strength grade; Carry out maintenance after ater-casting concreting completes, curing time is not less than 14 days;
2. basic built-in fitting is set: be bolted on the floorslab concrete girder (5) of the both sides of the both sides of the ater-casting (8) of the ground base base plate (1) of building and the ater-casting (8) except top layer and arrange basic built-in fitting (2);
3. prepare steel lattice column: according to design height, the on-the-spot standard knot forming steel lattice column that utilizes is connected by stiffener high-strength bolt, assembles each steel lattice column (3) of each floor support replacement;
4. steel lattice column is installed: by the lifting of each steel lattice column (3), makes each steel lattice column (3) by basic built-in fitting (2) vertical connection of its lower end and relevant position and weld; By fastening voussoir (4) wedging between the upper end of each steel lattice column (3) and corresponding floorslab concrete girder (5);
5. remove former steel pipe scaffold support system: after steel lattice column (3) support replacement acceptance(check), remove the steel pipe scaffold support system (9) of original ater-casting (8);
6. the clear cutter ater-casting concrete of building in advance: after support replacement completes, by the concrete chisel removal that each layer ater-casting (8) is built in advance;
7. power transmission girder steel is set: in the middle of ater-casting (8) position between the top floor concrete girder (6) of not constructed, pre-buried power transmission girder steel (7) is as force-transmitting block with after forming common stress system, continues the follow-up normal construction carrying out building on top layer.
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| CN201410025862.XA CN103758347B (en) | 2014-01-20 | 2014-01-20 | Large-span RC girder plated construction late poured band support underpinning construction method |
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| CN201410025862.XA CN103758347B (en) | 2014-01-20 | 2014-01-20 | Large-span RC girder plated construction late poured band support underpinning construction method |
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| CN106284845A (en) * | 2015-05-26 | 2017-01-04 | 五冶集团上海有限公司 | A kind of post-cast strip reinforced concrete structural column independence support system construction method |
| CN107558729B (en) * | 2017-09-11 | 2019-07-23 | 上海市城市建设设计研究总院（集团）有限公司 | The rear pouring tape construction method that girder is built by the big area roof of post-cast strip |
| CN110002350B (en) * | 2019-05-14 | 2024-03-22 | 中交一航局第二工程有限公司 | Tower section replacement device, tower crane comprising tower section replacement device and floor penetrating construction method of tower crane |
| CN110409806A (en) * | 2019-08-08 | 2019-11-05 | 泰博混凝土模板与支撑（陕西）有限公司 | A kind of early dismantling head and form bracing system |
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| GR1000174B (en) * | 1989-10-20 | 1991-12-10 | Minas Iosifidis | Surfaces for the stucco application |
| US20030131544A1 (en) * | 2000-08-08 | 2003-07-17 | Miller Philip Glen | Precast concrete beam element and methods of making and installing same |
| CN102235091A (en) * | 2010-04-22 | 2011-11-09 | 上海市第七建筑有限公司 | Construction method for ultralong concrete structure |
| CN102561690A (en) * | 2012-03-12 | 2012-07-11 | 中天建设集团有限公司 | Construction method for supporting structures on two sides of post-cast strip by use of brick column |
| CN203174645U (en) * | 2013-03-14 | 2013-09-04 | 中建三局第二建设工程有限责任公司 | Basement post-cast strip force transmission device |
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