CN-121976628-A - Two-way prestressing force subtracts superimposed sheet

Abstract

The invention discloses a bidirectional prestress overlap-reducing plywood and a manufacturing method thereof, comprising the following steps: precast concrete bottom plate, subtract pouring weight, vertical atress reinforcing bar, transversely distributed reinforcing bar, stiffening rib, horizontal pipeline. Longitudinal prestressed reinforcement and transverse reinforcement are arranged in the precast concrete base plate, mixed reinforcing ribs are arranged on the concrete base plate, and weight reducing blocks are paved on the precast concrete base plate and are separated by a certain distance. In the device, the transverse pipelines are connected into a straight line through the plurality of precast concrete base plates which are assembled together, and the pipelines are internally penetrated with the post-tensioned prestressed steel bars and tensioned to form the bidirectional prestressed floor slab, so that the bidirectional rigidity of the floor slab is consistent, the bidirectional force transmission performance is realized, the bidirectional cracking resistance effect is better, the integrity of the floor slab is better, and steel is saved.

Inventors

• ZHAO HONGBO
• ZHOU XUHONG
• ZHANG BO

Assignees

• 江苏万斯达建筑科技有限公司

Dates

Publication Date

20260505

Application Date

20231124

Claims (17)

1. 1. The bidirectional prestress overlap-reducing plywood is characterized by comprising a precast concrete base plate (1), weight reducing blocks (2), reinforcing ribs (3), longitudinal stress steel bars (4), transverse distribution steel bars (6) and transverse pipelines (5). Pretensioned prestressed longitudinal stress steel bars (4) and transverse distribution steel bars (6) are arranged in the precast concrete base plate (1), reinforcing ribs (3) and transverse pipelines (5) are arranged on the precast concrete base plate (1), and the transverse pipelines (5) transversely penetrate through the reinforcing ribs (3).
2. 2. The bidirectional prestress reduction and overlapping plywood according to claim 1, wherein the precast concrete base plate (1) is 45-70 mm thick.
3. 3. The bidirectional prestress reduction and overlapping plywood according to claim 1, wherein the reinforcing ribs (3) are concrete ribs which are formed by casting with a precast concrete base plate at one time.
4. 4. A bi-directional prestressing force subtracting superimposed panel according to claim 3, characterized in that the concrete rib is provided with stirrups (7).
5. 5. A bi-directional prestress reducing superimposed sheet as defined in claim 3, wherein said concrete ribs are provided with continuously bent wavy ribs (8).
6. 6. A bi-directional prestress reducing superimposed sheet as defined in claim 1, wherein the reinforcing ribs (3) are steel pipe truss or steel bar truss or steel pipe web truss or concrete truss ribs.
7. 7. A bi-directional prestress reducing superimposed sheet as set forth in claim 1, wherein said reinforcing rib (3) is a corrugated steel plate and concrete composite rib, the corrugated steel plate being a web, and concrete or steel bars or pipes being an upper flange.
8. 8.A two-way prestressed reduced overlap plywood according to claim 1, characterized in that said longitudinal stressed reinforcing bars (4) are pretensioned prestressed reinforcing bars.
9. 9. A bi-directional prestress reducing superimposed sheet as defined in claim 1, wherein said transverse duct (5) is a metal bellows.
10. 10. The bidirectional prestress reduction and overlapping plywood according to claim 1, wherein the bottom surface of the transverse pipeline (5) is lower than the upper surface of the precast concrete base plate (1) by 5 mm-20 mm, and the transverse pipeline is partially embedded in the precast concrete base plate.
11. 11. A bi-directional prestress reducing superimposed sheet according to claim 1, characterized in that the transverse pipe (5) rests on the surface of the precast concrete deck (1) and is fixed to the precast concrete deck.
12. 12. A bi-directional prestress reducing superimposed sheet as set forth in claim 1, wherein said transverse pipes (5) are arranged perpendicularly to the longitudinal stress bars (4) with a spacing of not less than 500mm.
13. 13. A bi-directional prestress overlap-reducing plywood according to claim 1, characterized in that said weight-reducing element (2) is a steel cage or a lightweight membrane shell or foam plate.
14. 14. A bi-directional prestress overlap-reducing plywood according to claim 1, characterized in that said weight-reducing element (2) is cast integrally with the precast concrete floor panel (1).
15. 15. A bi-directional prestress reducing superimposed sheet according to claim 1, characterized in that said weight reducing block (2) rests on and is fixed with the precast concrete deck (1).
16. 16. A bi-directional prestress reducing superimposed sheet according to claim 1, characterized in that said weight reducing blocks (2) are arranged in the area enclosed by the stiffening ribs (3) and the transverse duct (5).
17. 17. The manufacturing method of the bidirectional prestress overlap-reducing plywood is characterized by comprising the following steps of: Step 1, cleaning a die table; step 2, assembling a die according to a design drawing; Step 3, brushing a release agent; Step 4, arranging longitudinal stress steel bars and transverse distribution steel bars; Step 5, stretching the longitudinal stressed steel bars; Step 6, fixing the transverse distribution ribs, the transverse pipelines and the reinforcing ribs; Step7, pouring concrete and vibrating and leveling; step 8, placing weight reducing blocks and inserting stirrups on concrete ribs before the concrete is set up; Step 9, maintenance; and 10, lifting the plate after the concrete reaches the strength.

Description

Two-way prestressing force subtracts superimposed sheet The invention relates to the technical field of constructional engineering, in particular to a bidirectional prestress overlap-reducing plywood which can be widely applied to floors of various buildings. Background The existing pretensioned prestressed laminated slab mainly comprises a concrete rib laminated slab. The prior art adopts a concrete bottom plate provided with reinforcing ribs, and gaps or holes for inserting reinforcing steel bars are reserved at the joint of the ribs and the concrete bottom plate. During construction, the prefabricated components are assembled first, and then steel bars are penetrated on the surface of the precast concrete base plate and perpendicular to the reinforcing ribs to form the bidirectional stress component. Because the thickness of the concrete bottom plate is larger, the thickness of the protective layer of the rear inserted steel bar is larger, the stress performance of the rear inserted steel bar is seriously affected, and the later cracking risk of the member is also increased. This contradiction is particularly pronounced when the slab span is large, the slab with weight loss is thick, and the precast concrete floor panels are thick. In addition, common steel bars are inserted in the prior art, the member joints are easy to crack, and the usage amount of the steel bars is increased. In particular, when the existing concrete rib is provided with the weight reducing block, the contact surface between the prefabricated bottom plate and the cast-in-place concrete is smaller, the concrete reinforcing rib and the bottom plate are poured twice, the bonding strength between the bottom plate and the reinforcing rib is weaker, and the bonding between the cast-in-place concrete and the bottom plate is weaker. As spans and loads increase, existing techniques fail to meet structural load-bearing requirements. In addition, holes are reserved on the concrete ribs, so that when factory processing is easy to occur, the positions of the holes are not on the same line, the processing difficulty is high, and the later quality is difficult to control. Disclosure of Invention Therefore, the invention provides a bidirectional prestress overlap-reducing plywood which solves the problems in the prior art. The invention discloses a bidirectional prestress overlap-reducing plywood which comprises a precast concrete bottom plate, weight reducing blocks, reinforcing ribs, longitudinal stress reinforcing steel bars, transverse distribution reinforcing steel bars and transverse pipelines. The precast concrete bottom plate is internally provided with pretensioned prestressed longitudinal stress steel bars and transverse distribution steel bars, the precast concrete bottom plate is provided with reinforcing ribs and transverse pipelines, and the transverse pipelines cross the reinforcing ribs. In the device, the concrete bottom plate with the reinforcing ribs, the weight reducing blocks and the transverse pipelines for post-tensioning prestressed reinforcement are integrated on one component, after the floor slab is assembled, the transverse pipelines between the components are connected with a reinforcement penetrating pipeline, the post-tensioning prestressed reinforcement is penetrated, and the reinforcement is tensioned, so that the bidirectional prestressed overlap-reducing composite floor slab can be finally formed. The large-span heavy-load bidirectional homopolar floor slab can be realized, the integrity of the floor slab is better, the crack resistance of the floor slab is better, and the bidirectional force transmission of the floor slab is better. The two-way prestress is used, the floor slab reinforcement is greatly reduced relatively, and the construction is more convenient. Further, preferably, the thickness of the precast concrete base plate is 45 mm-70 mm. Further, preferably, the reinforcing rib is a concrete rib, and the concrete rib and the precast concrete base plate are cast and formed at one time. Further, preferably, the concrete rib is provided with stirrups. Further, preferably, the concrete rib is provided with a continuously bent wavy rib. Further preferably, the reinforcing rib is a steel pipe truss or a steel bar truss or a steel pipe web truss or a concrete truss rib. Further, preferably, the reinforcing rib is a corrugated steel plate and concrete composite rib, the corrugated steel plate is used as a web, and the concrete or steel bar or steel pipe is used as an upper flange. Further preferably, the longitudinal stress steel bar is a pretensioned prestressed steel bar. Further preferably, the transverse pipe is a metal bellows. Further, preferably, the bottom surface of the transverse pipeline is 5 mm-20 mm lower than the upper surface of the precast concrete base plate, and part of the transverse pipeline is embedded in the precast concrete base plate. Further preferably, the transverse duct rests on the s