CN211313026U - Large-span prestressed cast-in-place concrete floor slab - Google Patents
Large-span prestressed cast-in-place concrete floor slab Download PDFInfo
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- CN211313026U CN211313026U CN201922162765.6U CN201922162765U CN211313026U CN 211313026 U CN211313026 U CN 211313026U CN 201922162765 U CN201922162765 U CN 201922162765U CN 211313026 U CN211313026 U CN 211313026U
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Abstract
The utility model provides a large-span prestressed cast-in-place concrete floor, including station medium plate, steel strand wires stretch-draw groove, steel strand wires anchor end, prestressing steel strand wires, main atress reinforcing bar and longitudinal distribution reinforcing bar, set up prestressing steel strand wires in the station medium plate, be close to the side wall both sides on the station medium plate and be provided with a plurality of prestressing steel strand wires stretch-draw grooves, set up steel strand wires anchor end on the prestressing steel strand wires stretch-draw groove, prestressing steel strand wires connect between the steel strand wires anchor end, be on a parallel with station medium plate minor face direction ligature main atress reinforcing bar, be on a parallel with station medium plate longitudinal binding longitudinal distribution reinforcing bar; the utility model discloses simulate through stretch-draw prestressed anchorage cable messenger floor in concrete floor and produce certain reverse preload for offset the partial load of station floor, realize improving station floor bearing capacity, optimize the cross-section height and floor arrangement of reinforcement, reduce reinforcing bar tensile stress, compromise economic type and security.
Description
Technical Field
The utility model relates to a subway building structure component, concretely relates to large-span prestressing force cast in situ concrete floor.
Background
In order to drive regional economic development and solve the problems of traffic jam and the like, more and more cities begin to develop rail traffic vigorously, and subways enter the golden period of big development and big outbreak. Meanwhile, along with the development strategy of intensification and clustering of regional central cities, the challenges and requirements of subway station design are more and more strict, and open and wide public area pillar-free stations gradually become mainstream design trends and concepts.
The span of the standard subway station middle plate is about 20-23m, the requirements on stress and deflection of the middle plate structure in a public area without columns are stricter, however, the traditional station middle plate is manufactured by adopting a mode of binding reinforcing steel bars on site and pouring concrete, the thickness of the middle plate and the area of reinforcing steel bars need to be increased to ensure the structural safety, the economic great waste is caused, and the improvement on the structural safety is limited.
SUMMERY OF THE UTILITY MODEL
To the not good current situation of current subway station large-span concrete medium plate bearing capacity, amount of deflection performance, the utility model provides a large-span prestressing force cast in situ concrete floor through applying prestressing force for optimize floor arrangement of reinforcement and cross-sectional height when the floor bearing capacity promotes, compromise economic type and security. The utility model discloses be applicable to open cut/undercut station roof, bottom plate and all field large-span structural slab projects simultaneously.
The utility model discloses a following technical scheme realizes:
the utility model provides a large-span prestressing force cast in situ concrete floor, includes station medium plate, steel strand wires stretch-draw groove, steel strand wires anchor end, prestressing force steel strand wires, main atress reinforcing bar and longitudinal distribution reinforcing bar, sets up prestressing force steel strand wires in the station medium plate, be close to the side wall both sides on the station medium plate and be provided with a plurality of prestressing force steel strand wires stretch-draw grooves, set up steel strand wires anchor end on the prestressing force steel strand wires stretch-draw groove, prestressing force steel strand wires connect between steel strand wires anchor end, are on a parallel with station medium plate minor face direction ligature main atress reinforcing bar, are on a parallel with the longitudinal distribution reinforcing.
Preferably, an anchorage device is arranged at the anchoring end of the steel strand, and the prestressed steel strand is tensioned through the anchorage device.
The utility model discloses simulate through stretch-draw prestressed anchorage cable messenger floor in concrete floor and produce certain reverse preload for offset the partial load of station floor, realize improving station floor bearing capacity, optimize the cross-section height and floor arrangement of reinforcement, reduce reinforcing bar tensile stress's purpose.
Drawings
Fig. 1 is a schematic overall appearance diagram of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a schematic view of the operation principle of the present invention;
fig. 4 is an installation schematic diagram of the station middle plate of the present invention;
in the figure: 1-station middle plate, 2-steel strand tensioning groove, 3-steel strand anchoring end, 4-prestressed steel strand, 5-main stress steel bar and 6-longitudinal distribution steel bar.
Detailed Description
The present invention will be further described with reference to the following examples, which are only exemplary and illustrative, and should not be construed as limiting the scope of the present invention.
The embodiment of the utility model provides a as shown in following fig. 1-4, a large-span prestressing force cast in situ concrete floor, including members such as station medium plate 1, steel strand wires stretch-draw groove 2, steel strand wires anchor end 3, prestressing force steel strand wires 4, main atress reinforcing bar 5 and longitudinal distribution reinforcing bar 6.
Set up prestressing force steel strand 4 in station medium plate 1, be close to the side wall both sides on the station medium plate and be provided with a plurality of ways prestressing force steel strand stretching groove 2, set up steel strand anchoring end 3 on the steel strand stretching groove, prestressing force steel strand 4 connects between steel strand anchoring end, is on a parallel with station medium plate minor face direction ligature main atress reinforcing bar 5, is on a parallel with the vertical ligature longitudinal distribution reinforcing bar 6 of station medium plate.
The utility model discloses a construction steps as follows:
(1) erecting a scaffold, and erecting a formwork on the middle plate 1 of the station;
(2) as shown in fig. 2, the main stressed steel bars 5 and the longitudinally distributed steel bars 6 are bound, and simultaneously, the prestressed steel strands 4, the prestressed steel strand sleeves and the anchors are embedded equidistantly, and the steel strand tensioning grooves 2, the steel strand anchoring ends 3, the prestressed steel strand sleeves and the prestressed steel strands 4 can be flexibly arranged according to the actual conditions of a station; the method comprises the following steps that a plurality of prestressed steel strand tensioning grooves 2 are formed in a mold of a station middle plate 1 close to two sides of a side wall, a steel strand anchoring end 3 is arranged on each steel strand tensioning groove 2, a plurality of prestressed steel strands 4, prestressed steel strand sleeves and an anchorage device are embedded in the steel strand anchoring ends 3 at equal intervals, each prestressed steel strand sleeve is sleeved on each prestressed steel strand 4, each anchorage device is connected with each prestressed steel strand 4, a main stress steel bar 5 is bound in a direction parallel to the short side of the station middle plate 1, and a steel bar 6 is longitudinally bound in a direction parallel to the longitudinal direction; as shown in fig. 1, the main stressed steel bars 5 are steel bars parallel to the short side direction of the middle plate in the station, and are linearly expressed in the cross section; the longitudinally distributed reinforcing steel bars 6 are reinforcing steel bars parallel to the longitudinal direction of the middle plate in the station, and are expressed in a dotted manner in a cross section.
(3) Pouring concrete, and after the middle plate 1 and the steel strand tensioning grooves 2 in the station are molded and reach the designated design strength, pulling out the pre-buried prestressed steel strand sleeve to form a reserved hole;
(4) simultaneously tensioning or tensioning the prestressed steel strands 5 at one end by using anchorage devices such as jacks and the like by using the steel strand tensioning grooves 2 at two ends of the station middle plate 1, and applying prestress to the prestressed steel strands 5; the range of the pre-tension value is calculated and determined according to the actual station structure arrangement and is related to factors such as station span, middle plate thickness, load and the like, so that specific values or ranges are not limited in the embodiment;
(5) grouting the reserved hole after the prestressed steel strand 4 reaches the designed prestress value, and anchoring the prestressed steel strand 5 on the wall of the steel strand tensioning groove 2 by using an anchorage device;
(6) as shown in figure 3, the prestressed anchorage is tensioned to generate a vertical upward load q2 to partially offset the upper load q of the floor slab1The bearing capacity of the structure is improved and the deflection performance is optimized;
(7) and repeating the steps and carrying out the next cycle.
The foregoing is merely a preferred embodiment of the present invention, and the technical scope of the present invention should not be limited thereby, and all simple equivalent changes and modifications made by referring to the claims and the contents of the specification should be included in the scope covered by the claims of the present invention, which are hereby incorporated by reference.
Claims (2)
1. The utility model provides a large-span prestressing force cast in situ concrete floor, includes station medium plate (1), steel strand stretching groove (2), steel strand anchoring end (3), prestressing force stranded wire (4), main atress reinforcing bar (5) and longitudinal distribution reinforcing bar (6), its characterized in that, station medium plate (1) in set up prestressing force stranded wire (4) to be close to the side wall both sides on station medium plate (1) and be provided with a plurality of prestressing force stranded wire stretching grooves (2), set up steel strand anchoring end (3) on steel strand stretching groove (2), prestressing force stranded wire (4) are connected between steel strand anchoring end (3), are on a parallel with station medium plate (1) minor face direction ligature main atress reinforcing bar (5), are on a parallel with station medium plate (1) longitudinal distribution reinforcing bar (6).
2. The large-span prestressed cast-in-place concrete floor as claimed in claim 1, wherein said steel strand anchoring end (3) is provided with an anchorage device, and said prestressed steel strand (4) is tensioned by means of the anchorage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922162765.6U CN211313026U (en) | 2019-12-06 | 2019-12-06 | Large-span prestressed cast-in-place concrete floor slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922162765.6U CN211313026U (en) | 2019-12-06 | 2019-12-06 | Large-span prestressed cast-in-place concrete floor slab |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211313026U true CN211313026U (en) | 2020-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922162765.6U Active CN211313026U (en) | 2019-12-06 | 2019-12-06 | Large-span prestressed cast-in-place concrete floor slab |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216290A (en) * | 2021-05-11 | 2021-08-06 | 上海市城市建设设计研究总院（集团）有限公司 | Detachable subway station roof collapse prevention guy cable structure and construction method |
| CN114658154A (en) * | 2022-04-14 | 2022-06-24 | 山东建筑大学 | Prefabricated floor slab |
-
2019
- 2019-12-06 CN CN201922162765.6U patent/CN211313026U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216290A (en) * | 2021-05-11 | 2021-08-06 | 上海市城市建设设计研究总院（集团）有限公司 | Detachable subway station roof collapse prevention guy cable structure and construction method |
| CN114658154A (en) * | 2022-04-14 | 2022-06-24 | 山东建筑大学 | Prefabricated floor slab |
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