CN112761289A - Local steel bar truss prestressed concrete laminated bottom plate and manufacturing method thereof - Google Patents
Local steel bar truss prestressed concrete laminated bottom plate and manufacturing method thereof Download PDFInfo
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- CN112761289A CN112761289A CN202110079962.0A CN202110079962A CN112761289A CN 112761289 A CN112761289 A CN 112761289A CN 202110079962 A CN202110079962 A CN 202110079962A CN 112761289 A CN112761289 A CN 112761289A
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- steel bar
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
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Abstract
The invention discloses a local steel bar truss prestressed concrete superposed bottom plate and a manufacturing method thereof. The prestressed concrete laminated bottom plate comprises a concrete plate and prestressed tendons embedded in the concrete plate along the longitudinal direction; the lower part of the local steel bar truss is embedded in the concrete slab, the upper part of the local steel bar truss is positioned outside the concrete slab, and the local steel bar truss is longitudinally arranged at the midspan construction temporary support position of the prestressed concrete laminated bottom plate. Compared with the prior art, the invention resists the reverse bending moment generated by the support through the local steel bar truss, has simple manufacture and flexible application, achieves the aim of no support or less support in construction under the condition of meeting the requirement of engineering application span, and solves the problem of higher cost of the laminated floor slab caused by the arrangement of the construction support and the full-length steel bar truss at the present stage.
Description
Technical Field
The invention relates to the technical field of prefabricated concrete structures, in particular to a local steel bar truss prestressed concrete superposed bottom plate and a manufacturing method thereof.
Background
In recent years, with the continuous promotion of the building industrialization process, the prefabricated concrete structure is rapidly developed, the prefabricated concrete composite floor slab is widely applied to the prefabricated building, wherein the application of the steel bar truss composite floor slab (including the steel pipe truss composite slab) is the most, the product can reduce the wet operation steps, the construction templates and the use amount of scaffolds in the construction process, reduce the labor consumption, reduce the construction difficulty and improve the construction efficiency, but in the current situation, compared with the existing cast-in-place floor slab, the cost of the existing product is still higher, and the cost of the existing product is mostly directly related to the cost of the steel bar truss (or the steel pipe truss), and the cost of the steel pipe truss is higher than that of the steel bar truss.
The existing steel bar truss composite slab (or steel pipe truss composite slab) is a prefabricated steel bar truss (or steel pipe truss) arranged along the length direction of the concrete composite slab, wherein the steel bar truss (or steel pipe truss) is formed by combining an upper chord member, a web member and a lower chord member, the upper chord member of the steel bar truss is a steel bar, and the upper chord member of the steel pipe truss is a steel pipe. When the bottom plate of the precast concrete composite slab is poured, the lower chord members and part of the web members of the steel bar trusses (or the steel pipe trusses) are embedded into the precast concrete bottom plate, so that the steel bar truss composite slab (or the steel pipe truss composite slab) is formed in a combined mode. The steel bar truss (or steel pipe truss) has little contribution to the rigidity of the precast concrete superposed base plate, the rigidity of the superposed base plate is increased by increasing concrete ribs or the thickness of the base plate through the base plate, the manufacturing difficulty is high, the cost is high, and the precision is difficult to control.
In view of the application condition at the present stage, in order to meet the span requirement of engineering application, the steel bar truss composite slab (or the steel pipe truss composite slab) is generally subjected to support construction, and the construction cost of the composite floor slab is greatly increased due to the existence of construction supports. Through research and analysis, the cost of the unidirectional close-spliced prestressed concrete composite floor slab can be greatly reduced, but because the prestressed concrete composite floor slab does not have a steel bar truss on the upper part or a truss in other forms, the construction stage is difficult to support or less, if the prestressed concrete composite floor slab is unsupported, the application span is limited and is not enough to meet the engineering application requirement, if the prestressed concrete composite floor slab is supported, in order to ensure that the upper part of the prestressed concrete composite floor slab is not pulled to crack, a plurality of supports are required to be arranged to meet the stress requirement of the construction stage, and the cost is increased.
Therefore, the technical staff in the field needs to solve the problem of how to realize the purpose that the prestressed concrete composite slab is not supported or is supported less in the construction stage on the premise of meeting the requirement of the engineering application span, and solve the problem of cost increase caused by the arrangement of multiple supports and the arrangement of the steel bar truss (or steel pipe truss) in the full length.
Disclosure of Invention
The invention aims to provide a local steel bar truss prestressed concrete laminated bottom plate and a manufacturing method thereof, wherein 1-3 temporary supports are determined to be arranged at a midspan position according to the requirement of an application span and the thickness of the laminated bottom plate in a construction stage, and a local steel bar truss is arranged in a certain range at the support position to resist reverse bending moment generated by the support.
In order to achieve the purpose, the invention provides the following scheme:
the invention discloses a local steel bar truss prestressed concrete superposed bottom plate, comprising:
the prestressed concrete laminated bottom plate comprises a concrete plate and prestressed tendons longitudinally embedded in the concrete plate;
the lower portion of the local steel bar truss is embedded in the concrete slab, the upper portion of the local steel bar truss is located outside the concrete slab, the local steel bar truss is longitudinally arranged at a midspan construction temporary supporting position of the prestressed concrete laminated bottom plate, the length of the local steel bar truss covers a reverse bending moment range generated at the temporary supporting position, and the length of the local steel bar truss is smaller than the longitudinal length of the prestressed concrete laminated bottom plate.
Preferably, the prestressed concrete laminated bottom plate is a smooth surface prestressed concrete laminated bottom plate, and the upper surface of the smooth surface prestressed concrete laminated bottom plate is a natural rough surface.
Preferably, the prestressed concrete laminated bottom plate is a ribbed prestressed concrete laminated bottom plate, and the upper surface of the ribbed prestressed concrete laminated bottom plate is a ribbed surface.
Preferably, the local steel bar truss comprises an upper chord rib, two web ribs and two lower chord ribs, the upper chord rib and the lower chord ribs are longitudinally arranged, one upper chord rib is located in the middle position of the upper sides of the two lower chord ribs, the two web ribs are respectively located on two sides of the upper chord rib, the lower portions of the two web ribs are respectively welded with one lower chord rib, and the upper portions of the two web ribs are welded with the same upper chord rib.
Preferably, the prestressed concrete laminated bottom plate further comprises transverse steel bars, the transverse steel bars are embedded in the concrete slab along the transverse direction, and the transverse steel bars are located on the lower sides of the prestressed steel bars.
Preferably, the diameter of the tendon is 4.8mm-16 mm.
Preferably, the thickness of the prestressed concrete laminated base plate is not less than 30 mm.
Preferably, the upper chord rib and the lower chord rib are hot-rolled ribbed steel bars with the diameter of 8mm or 10mm, and the web rib is cold-rolled smooth round steel bar with the diameter of 6 mm.
The invention also discloses a manufacturing method of the local steel bar truss prestressed concrete superposed base plate, which comprises the following steps:
s1, placing a plurality of prestressed tendons in the concrete mould or the mould platform side by side along the longitudinal direction;
s2, applying tension on two ends of each prestressed tendon by using a steel bar tensioning machine, wherein the tension value applied on each prestressed tendon is 0.4-0.8 times of the tensile strength of the prestressed tendon;
s3, placing a local steel bar truss longitudinally at a determined position in the concrete mould or the mould platform, wherein the local steel bar truss comprises an upper chord steel bar, web reinforcements on two sides and a lower chord steel bar, so that the lower chord steel bar and the lower parts of the web reinforcements are positioned in the concrete mould or the mould platform, and the upper parts of the web reinforcements and the upper chord steel bar of the truss are positioned outside the concrete mould or the mould platform;
s4, placing transverse steel bars into the concrete mould or the mould platform, wherein the transverse steel bars are positioned at the lower sides of the prestressed tendons;
s5, pouring concrete into the concrete mould or mould platform and completing maintenance, so that the prestressed concrete superposed bottom plate and the local steel bar truss are combined to form a whole;
s6, cutting off the prestressed tendons at the two ends of the prestressed concrete laminated bottom plate;
and S7, using lifting equipment to lift the prestressed concrete laminated bottom plate and the local steel bar truss out of the concrete mold or the mold table together, thus obtaining the prestressed concrete laminated bottom plate of the local steel bar truss.
Compared with the prior art, the invention has the following technical effects:
1. because the steel bar truss is only arranged at the local position of the temporary construction support, the production is simplified, the operation is flexible, the product quality is easier to control, workers in a construction field can more easily understand the effect of the steel bar truss, and the construction quality is easier to control;
2. the local steel frame truss is suitable for a smooth surface prestressed concrete superposed bottom plate and is also suitable for a ribbed prestressed concrete superposed bottom plate, and the selection of the prestressed concrete bottom plate is not limited and the application is flexible;
3. the requirement of engineering application on span is met, the aim of less support in the construction stage is fulfilled, the engineering cost is reduced, the construction efficiency is improved, and the forward guide of the unidirectional close-spliced and overlapped floor system in the application of the fabricated building is enhanced;
4. because the local arrangement of steel bar truss, compare in the steel bar truss superimposed sheet (or steel pipe truss superimposed sheet) at present stage, its steel bar truss quantity significantly reduces, and the cost sharply descends, and economic nature is better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a top view of a partially reinforced truss prestressed concrete laminated bottom plate according to this embodiment when a smooth surface prestressed concrete laminated bottom plate is used;
fig. 2 is a cross-sectional view of the partially reinforced truss prestressed concrete laminated bottom plate of the embodiment when a smooth surface prestressed concrete laminated bottom plate is used;
FIG. 3 is a longitudinal cross-sectional view of the partially reinforced truss prestressed concrete laminated bottom plate of the present embodiment when a smooth prestressed concrete laminated bottom plate is used;
FIG. 4 is a top view of the partially reinforced truss prestressed concrete laminated bottom plate of this embodiment when using a ribbed prestressed concrete laminated bottom plate;
FIG. 5 is a cross-sectional view of the partially reinforced truss prestressed concrete laminated bottom plate of this embodiment when using a ribbed prestressed concrete laminated bottom plate;
FIG. 6 is a longitudinal sectional view of the partially reinforced truss prestressed concrete laminated bottom plate according to the embodiment of the present invention, when a ribbed prestressed concrete laminated bottom plate is used;
description of reference numerals: 1-laminating a smooth surface prestressed concrete base plate; 2-ribbed prestressed concrete superposed bottom plate; 3-local steel bar trusses; 4-upper chord tendon; 5-abdominal muscle; 6-lower chord rib; 7-upper surface; 8-prestressed tendons; 9-transverse reinforcing steel bars.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a local steel bar truss prestressed concrete laminated bottom plate and a manufacturing method thereof, wherein 1-3 temporary supports are determined to be arranged at a midspan position according to the requirement of an application span and the thickness of the laminated bottom plate in a construction stage, and a local steel bar truss is arranged in a certain range at the support position to resist reverse bending moment generated by the support.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 6, the present embodiment provides a partial steel truss prestressed concrete laminated bottom plate, which includes a prestressed concrete laminated bottom plate and a partial steel truss 3.
The prestressed concrete laminated bottom plate comprises a concrete plate and prestressed tendons 8 embedded in the concrete plate along the longitudinal direction; the lower part of the local steel bar truss 3 is embedded in the concrete slab, and the upper part of the local steel bar truss 3 is positioned outside the concrete slab. The local steel bar truss 3 is longitudinally arranged at the midspan construction temporary support position of the prestressed concrete laminated bottom plate, the length of the local steel bar truss 3 covers the range of the bending moment generated at the temporary support position, and the length of the local steel bar truss 3 is smaller than the longitudinal length of the prestressed concrete laminated bottom plate.
Because the existence of the local steel bar truss 3 can effectively resist the reverse bending moment at the construction supporting position and the periphery, the problem that the upper part of the precast concrete bottom plate is cracked when a small amount of temporary supports are arranged in the construction stage is solved. Meanwhile, due to the existence of the local steel bar truss 3, 1-3 temporary supports can be transversely arranged in the middle of the bottom plate span in the construction stage, and the problem that the span is limited due to the fact that the bearing capacity of the laminated bottom plate cannot meet the requirement is solved.
In this embodiment, the prestressed concrete laminated bottom plate may be a smooth surface prestressed concrete laminated bottom plate 1 (as shown in fig. 1-3), and the upper surface 7 of the smooth surface prestressed concrete laminated bottom plate 1 is a natural rough surface; the prestressed concrete laminated floor can also be a ribbed prestressed concrete laminated floor 2 (as shown in fig. 4-6), and the upper surface 7 of the ribbed prestressed concrete laminated floor 2 is a ribbed surface.
The specific form of the local steel bar truss 3 is various, and in this embodiment, the local steel bar truss 3 includes an upper chord 4, two web bars 5, and two lower chord 6. The upper chord tendons 4 and the lower chord tendons 6 are longitudinally arranged, one upper chord tendon 4 is positioned in the middle of the upper sides of the two lower chord tendons 6, and the two web tendons 5 are respectively positioned on two sides of the upper chord tendon 4. The lower parts of the two web ribs 5 are respectively welded with a lower chord rib 6, and the upper parts of the two web ribs 5 are welded with the same upper chord rib 4. Because local steel bar truss 3 wholly is triangle-shaped support, bearing capacity is stronger.
In order to further improve the bearing capacity, the prestressed concrete laminated bottom plate of the embodiment further comprises transverse steel bars 9, the transverse steel bars 9 are embedded in the concrete slab along the transverse direction, and the transverse steel bars 9 are located on the lower sides of the prestressed steel bars 8.
In the embodiment, the diameter of the prestressed tendon 8 is preferably 4.8mm-16 mm; the thickness of the prestressed concrete laminated bottom plate is preferably not less than 30 mm; the upper chord ribs 4 and the lower chord ribs 6 are both preferably hot-rolled ribbed steel bars with the diameter of 8mm or 10mm, and the web ribs 5 are preferably cold-rolled smooth round steel bars with the diameter of 6 mm.
The embodiment also provides a manufacturing method of the local steel bar truss prestressed concrete laminated bottom plate, which comprises the following steps:
s1, placing a plurality of prestressed tendons 8 in the concrete mould or the mould platform side by side along the longitudinal direction;
s2, applying tension on two ends of each prestressed tendon 8 by using a steel bar tensioning machine, wherein the tension value applied on each prestressed tendon 8 is 0.4-0.8 times of the tensile strength of the prestressed tendon;
s3, placing a local steel bar truss 3 at a determined position in the concrete mould or the mould platform along the longitudinal direction, wherein the local steel bar truss 3 comprises an upper chord rib 4, web ribs 5 at two sides and a lower chord rib 6, so that the lower parts of the lower chord rib 6 and the web ribs 5 are positioned in the concrete mould or the mould platform, and the upper parts of the web ribs 5 and the upper chord ribs 4 of the truss are positioned outside the concrete mould or the mould platform;
s4, placing transverse steel bars 9 into the concrete mould or the mould platform, wherein the transverse steel bars 9 are positioned at the lower sides of the prestressed tendons 8;
s5, pouring concrete into the concrete mould or the mould platform and finishing maintenance to enable the prestressed concrete superposed bottom plate to be combined with the local steel bar truss 3 to form a whole;
s6, cutting off the prestressed tendons 8 at the two ends of the prestressed concrete laminated bottom plate;
and S7, using lifting equipment to lift the prestressed concrete laminated bottom plate and the local steel bar truss 3 out of the concrete mould or the mould platform together, thus obtaining the prestressed concrete laminated bottom plate of the local steel bar truss.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. The utility model provides a local steel bar truss prestressed concrete coincide bottom plate which characterized in that includes:
the prestressed concrete laminated bottom plate comprises a concrete plate and prestressed tendons longitudinally embedded in the concrete plate;
the lower portion of the local steel bar truss is embedded in the concrete slab, the upper portion of the local steel bar truss is located outside the concrete slab, the local steel bar truss is longitudinally arranged at a midspan construction temporary supporting position of the prestressed concrete laminated bottom plate, the length of the local steel bar truss covers a reverse bending moment range generated at the temporary supporting position, and the length of the local steel bar truss is smaller than the longitudinal length of the prestressed concrete laminated bottom plate.
2. The partial steel truss prestressed concrete laminated bottom plate according to claim 1, wherein said prestressed concrete laminated bottom plate is a smooth surface prestressed concrete laminated bottom plate, and an upper surface of said smooth surface prestressed concrete laminated bottom plate is a natural rough surface.
3. The partial steel truss prestressed concrete laminated bottom plate according to claim 1, wherein said prestressed concrete laminated bottom plate is a ribbed prestressed concrete laminated bottom plate, and an upper surface of said ribbed prestressed concrete laminated bottom plate is a ribbed surface.
4. The local steel bar truss prestressed concrete superposed base plate according to claim 1, wherein the local steel bar truss comprises an upper chord, two web members and two lower chord, the upper chord and the lower chord are both arranged along a longitudinal direction, one upper chord is located at an upper middle position of the two lower chord, the two web members are respectively located at two sides of the upper chord, lower portions of the two web members are respectively connected with one lower chord by welding, and upper portions of the two web members are connected with the same upper chord by welding.
5. The partial steel truss prestressed concrete laminated bottom plate according to claim 1, further comprising a transverse steel bar embedded in said concrete slab in a transverse direction, said transverse steel bar being located at a lower side of said prestressed steel bar.
6. The laminated partial steel truss prestressed concrete floor as claimed in claim 1, wherein said prestressed reinforcement has a diameter of 4.8mm-16 mm.
7. The partial steel truss prestressed concrete laminated bottom plate according to claim 1, wherein said prestressed concrete laminated bottom plate has a thickness of not less than 30 mm.
8. The local steel bar truss prestressed concrete superposed base plate according to claim 4, wherein the upper chord steel bar and the lower chord steel bar are hot-rolled ribbed steel bars with the diameter of 8mm or 10mm, and the web steel bar is cold-rolled smooth round steel bar with the diameter of 6 mm.
9. A method for manufacturing a partially reinforced truss prestressed concrete laminated bottom plate according to any one of claims 1 to 8, comprising the steps of:
s1, placing a plurality of prestressed tendons in the concrete mould or the mould platform side by side along the longitudinal direction;
s2, applying tension on two ends of each prestressed tendon by using a steel bar tensioning machine, wherein the tension value applied on each prestressed tendon is 0.4-0.8 times of the tensile strength of the prestressed tendon;
s3, placing a local steel bar truss longitudinally at a determined position in the concrete mould or the mould platform, wherein the local steel bar truss comprises an upper chord steel bar, web reinforcements on two sides and a lower chord steel bar, so that the lower chord steel bar and the lower parts of the web reinforcements are positioned in the concrete mould or the mould platform, and the upper parts of the web reinforcements and the upper chord steel bar of the truss are positioned outside the concrete mould or the mould platform;
s4, placing transverse steel bars into the concrete mould or the mould platform, wherein the transverse steel bars are positioned at the lower sides of the prestressed tendons;
s5, pouring concrete into the concrete mould or mould platform and completing maintenance, so that the prestressed concrete superposed bottom plate and the local steel bar truss are combined to form a whole;
s6, cutting off the prestressed tendons at the two ends of the prestressed concrete laminated bottom plate;
and S7, using lifting equipment to lift the prestressed concrete laminated bottom plate and the local steel bar truss out of the concrete mold or the mold table together, thus obtaining the prestressed concrete laminated bottom plate of the local steel bar truss.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110079962.0A CN112761289A (en) | 2021-01-21 | 2021-01-21 | Local steel bar truss prestressed concrete laminated bottom plate and manufacturing method thereof |
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| CN202110079962.0A CN112761289A (en) | 2021-01-21 | 2021-01-21 | Local steel bar truss prestressed concrete laminated bottom plate and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114086709A (en) * | 2021-12-03 | 2022-02-25 | 扬州大学 | Post-tensioned prestressed truss type reinforcement UHPC-foam concrete combined floor slab |
| CN116044073A (en) * | 2023-03-30 | 2023-05-02 | 秦皇岛和信基业建筑科技有限公司 | Prestressed concrete composite floor slab and preparation process thereof |
-
2021
- 2021-01-21 CN CN202110079962.0A patent/CN112761289A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114086709A (en) * | 2021-12-03 | 2022-02-25 | 扬州大学 | Post-tensioned prestressed truss type reinforcement UHPC-foam concrete combined floor slab |
| CN116044073A (en) * | 2023-03-30 | 2023-05-02 | 秦皇岛和信基业建筑科技有限公司 | Prestressed concrete composite floor slab and preparation process thereof |
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