Large-span prestressed light cast-in-place hollow sandwich panel

Abstract

The utility model discloses a large-span prestressed light cast-in-place hollow sandwich panel, and aims to solve the problems of high cost, large structural height, poor crack resistance and the like of the traditional structure under the conditions of large span and high load. The sandwich panel structure comprises a concrete beam body, the hierarchical structure of the concrete beam body is composed of a top plate, prestressed steel bars and a bottom plate, the prestressed steel bars are arranged along the main axis and filled with foaming material filling boxes, and connecting pieces are arranged on the side faces. The improved part comprises a filling box material, a top plate and bottom plate material, a connecting piece form and the like, so that the structural performance and the construction efficiency are improved. The structure has remarkable advantages in the aspects of heat preservation, heat insulation, crack resistance, construction period and the like, and is suitable for large-span and high-load scenes in various constructional engineering.

Description

Technical Field

[0001] The utility model belongs to the field of construction engineering, and specifically relates to a large-span prestressed lightweight cast-in-place hollow sandwich panel. Background Art

[0002] In the field of construction engineering, the design and construction of large-span structures has always been an important technical challenge. At present, large conference halls, stadiums and other places at home and abroad mostly use steel structure ceilings, but steel structures have many disadvantages, such as poor fire resistance. Once a fire occurs, when the temperature is between 300 and 400 degrees Celsius, the strength of the steel will drop significantly; when the temperature exceeds 600 degrees Celsius, the strength of the steel will be almost zero, causing collapse accidents. Another example is the poor corrosion resistance of steel structures. In humid and high-salt areas such as along rivers, lakes and seas, it is easy to rust, thus affecting the service life.

[0003] In order to solve these problems and improve the bearing capacity and construction efficiency of the building structure, the utility model proposes a novel large-span prestressed lightweight cast-in-place hollow sandwich panel. Summary of the invention

[0004] In order to solve the above problems, the utility model discloses a large-span prestressed lightweight cast-in-place hollow sandwich panel, including a concrete beam body, the concrete beam body is a hierarchical structure, from top to bottom, there are a top plate, prestressed steel bars, and a bottom plate, the prestressed steel bars are arranged along the main axis of the concrete beam body, the hollow part inside the prestressed steel bars is filled with a foam material filling box, and the side of the concrete beam body is also provided with a connecting piece. The present application adopts a large-span prestressed lightweight cast-in-place hollow plate structure, and under the premise of the same span and the same load, its structural height is the lowest compared with any existing structural form. After the hollow plate is prestressed, the structure has better crack resistance. Therefore, it is particularly suitable for harsh environments such as high temperature, high humidity, high salt, and underground large-span structures. The hollow plate is filled with polystyrene foam material, so that the hollow plate has better thermal insulation and sound insulation performance than other structural forms, and has many advantages such as a relatively short construction period and good economy.

[0005] In order to achieve the above object, the technical solution of the utility model is as follows:

[0006] A large-span prestressed lightweight cast-in-place hollow sandwich panel comprises a concrete beam body. The concrete beam body is a hierarchical structure, which comprises a top plate, prestressed steel bars and a bottom plate from top to bottom. The prestressed steel bars are arranged along the main axis of the concrete beam body. The hollow part inside the prestressed steel bars is filled with a foaming material filling box. Connectors are also provided on the sides of the concrete beam body.

[0007] As an improvement of the utility model, the foam material filling box is polystyrene foam formed by mold compression, and the surface density is ≥15kg / m3.

[0008] As an improvement of the utility model, a reinforcement layer is provided on the upper surface of the foam material filling box.

[0009] As an improvement of the utility model, the top plate and the bottom plate are steel plates, and the connecting members are bolts.

[0010] As an improvement of the present utility model, the cross-section of the concrete beam body is rectangular or trapezoidal.

[0011] As an improvement of the utility model, prestressed tendons are provided at the bottom of the concrete beam body, the prestressed tendons are arranged along the longitudinal direction of the concrete beam body, and prestressed anchors are fixed between the concrete beam body and the prestressed tendons.

[0012] As an improvement of the utility model, the prestressed anchor comprises a tensioning end and an anchoring end, the tensioning end is a single-hole clip-type anchor, and the anchoring end is an extrusion anchor.

[0013] The beneficial effects of the utility model are:

[0014] (1) The large-span prestressed lightweight cast-in-place hollow sandwich panel structure provided in this application has a low height, which effectively saves building space. Through the provision of prestressed steel bars and the adoption of the hollow sandwich panel structure, the anti-cracking performance of the structure is enhanced, thereby improving the stability and safety of the structure.

[0015] (2) The large-span prestressed lightweight cast-in-place hollow sandwich panels provided in this application are particularly suitable for harsh environments such as high temperature, high humidity, high salt, and underground large-span structures, and have good applicability and environmental adaptability. The polystyrene foam material filled in the hollow panel has good thermal insulation and sound insulation properties, making the structure outstanding in terms of thermal insulation.

[0016] (3) The large-span prestressed lightweight cast-in-place hollow sandwich panels provided in this application adopt a cast-in-place construction method, combined with the use of lightweight materials, which greatly shortens the construction period and improves the economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] List of Figure Symbols:

[0019] 1. Concrete beam; 2. Top plate; 3. Prestressed steel bars; 4. Bottom plate; 5. Foam material filling box; 6. Connectors; 7. Reinforcement layer; 8. Prestressed tendons; 9. Prestressed anchors. DETAILED DESCRIPTION

[0020] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the accompanying drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0021] As shown in the figure, a large-span prestressed lightweight cast-in-place hollow sandwich panel described in the utility model includes a concrete beam body 1. The concrete beam body 1 is a hierarchical structure, which includes a top plate 2, prestressed steel bars 3, and a bottom plate 4 from top to bottom. The prestressed steel bars 3 are arranged along the main axis of the concrete beam body 1. The hollow part inside the prestressed steel bars 3 is filled with a foam material filling box 5. A connecting piece 6 is also provided on the side of the concrete beam body 1.

[0022] The foam material filling box 5 described in the utility model is polystyrene foam formed by mold compression, and the surface density is ≥15kg / m3.

[0023] The upper surface of the foam material filling box 5 of the utility model is provided with a reinforcement layer 7 to enhance the structural strength and stability of the filling box.

[0024] The top plate 2 and the bottom plate 4 described in the utility model are steel plates, and the connecting member 6 is a bolt.

[0025] The cross section of the concrete beam body 1 of the utility model is rectangular or trapezoidal.

[0026] The bottom of the concrete beam body 1 described in the utility model is provided with prestressed tendons 8, and the prestressed tendons 8 are arranged along the longitudinal direction of the concrete beam body 1, and a prestressed anchor 9 is fixed between the concrete beam body 1 and the prestressed tendons 8.

[0027] The prestressed anchor 9 described in the utility model includes a tensioning end and an anchoring end. The tensioning end is a single-hole clip-type anchor, which is composed of a single-hole anchor, an anchor plate, a hole mold, and spiral reinforcement. The anchoring end is an extrusion anchor, which is composed of an extrusion anchor, a pressure plate, and spiral reinforcement.

[0028] Specifically, the working principle of the utility model is as follows:

[0029] First, prestressed steel bars 3 are arranged on the main axis of the concrete beam 1 according to the design requirements. These steel bars are arranged along the length of the beam and are evenly distributed on the cross section of the beam to provide the prestressed support required for the structure. Foam filling boxes 5 are installed in the hollow parts between the prestressed steel bars 3. These filling boxes are polystyrene foams pressed by molds, with a surface density of 15kg / m or more. 3They are inserted inside the prestressed steel bars 3, filling the gaps between the steel bars and providing additional support and structural stability.

[0030] Steel plates are installed on the top and bottom of the concrete beam 1 as the top plate 2 and the bottom plate 4. These steel plates provide the upper and lower closed structures of the sandwich panel and can bear the loads from the top and the bottom, while protecting the filling box and the prestressed steel bars 3. Connectors 6 are installed on the sides of the concrete beam 1, usually connected by bolts. These connectors 6 are used to fix the connection between the sandwich panel and other structural elements, increasing the overall stability and bearing capacity of the structure.

[0031] Finally, concrete is poured between the prestressed steel bars 3 and the filling box to form a concrete beam body 1. During the pouring process, the concrete fully fills the gap between the steel bars and the filling box to ensure the integrity and stability of the entire structure.

[0032] Prestressed tendons 8 are arranged at the bottom of the concrete beam body 1 and arranged along the longitudinal direction of the beam body. The prestressed tendons 8 are fixed to the concrete beam body 1 by prestressed anchors 9 to ensure that the prestressed state of the prestressed steel bars 3 is maintained.

[0033] The prestressed anchor 9 includes a tensioning end and an anchoring end. The tensioning end adopts a single-hole clip-type anchor, which is composed of a single-hole anchor, an anchor plate, a hole mold, and a spiral rib, and is used to tension the prestressed rib 8. The anchoring end adopts an extrusion anchor, which is composed of an extrusion anchor, a pressure plate, and a spiral rib, and is used to fix the anchoring position of the prestressed rib 8.

[0034] Through the above work flow, the production of large-span prestressed lightweight cast-in-place hollow sandwich panels was realized. This structure has the advantages of good crack resistance, low structural height, and excellent thermal insulation performance. It is suitable for large-span and high-load scenarios in various construction projects.

[0035] It should be noted that the accompanying drawings only illustrate the technical idea of ​​the utility model, and the protection scope of the utility model cannot be limited by this shape. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model. These improvements and modifications all fall within the protection scope of the claims of the utility model.

Claims

1. A large-span prestressed lightweight cast-in-place hollow sandwich panel, comprising a concrete beam body, wherein the concrete beam body is a hierarchical structure, which comprises a top plate, prestressed steel bars, and a bottom plate from top to bottom, and is characterized in that: The prestressed steel bars are arranged along the main axis of the concrete beam body, the hollow parts inside the prestressed steel bars are filled with foam material filling boxes, and the sides of the concrete beam body are also provided with connecting pieces.

2. The large-span prestressed lightweight cast-in-place hollow sandwich panel according to claim 1 is characterized in that: The foaming material filling box is a polystyrene foam formed by mold compression, with a surface density of ≥15kg / m 3 .

3. The large-span prestressed lightweight cast-in-place hollow sandwich panel according to claim 1 is characterized in that: A reinforcement layer is provided on the upper surface of the foam material filling box.

4. The large-span prestressed lightweight cast-in-place hollow sandwich panel according to claim 1 is characterized in that: The top plate and the bottom plate are steel plates, and the connecting members are bolts.

5. The large-span prestressed lightweight cast-in-place hollow sandwich panel according to claim 1 is characterized in that: The cross section of the concrete beam body is rectangular or trapezoidal.

6. The large-span prestressed lightweight cast-in-place hollow sandwich panel according to claim 1 is characterized in that: Prestressed tendons are arranged at the bottom of the concrete beam body, and the prestressed tendons are arranged along the longitudinal direction of the concrete beam body. Prestressed anchors are fixed between the concrete beam body and the prestressed tendons.

7. The large-span prestressed lightweight cast-in-place hollow sandwich panel according to claim 6 is characterized in that: The prestressed anchor comprises a tensioning end and an anchoring end, the tensioning end is a single-hole clip-type anchor, and the anchoring end is an extrusion anchor.

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