Prestressed concrete laminated slab bottom plate

Abstract

According to the prestressed concrete laminated slab bottom plate, by adopting a method of arranging grooves, under the condition of double-layer reinforcement arrangement, the centers of bidirectional prestressed reinforcements are equivalently arranged at the center of the horizontal axis of the cross section of a bidirectional prestressed concrete slab; the axial center of the transverse section of the bidirectional prestressed concrete slab is pressed, and the axial center of the longitudinal section of the groove position is pressed, so that the bottom plate of the prestressed concrete laminated slab can be effectively prevented from warping and cracking. The bottom plate of the bidirectional prestressed concrete laminated slab prepared by the method is simple in process, good in quality, high in efficiency and low in cost.

Description

Technical Field

[0001] This utility model belongs to the field of building construction engineering technology, and relates to concrete components and prefabrication technology, especially to the base plate of prestressed concrete composite slab. Background Technology

[0002] Prestressed concrete composite slabs are widely used due to their excellent stiffness and crack resistance. Currently, most prestressed concrete composite slabs are manufactured using unidirectional prestressing. However, due to the Poisson's ratio of concrete, cracks parallel to the prestressing steel bars easily form in the slab, causing considerable inconvenience to users. To overcome the cracking phenomenon caused by the Poisson's ratio of concrete, the use of bidirectional prestressing technology to prepare prestressed concrete composite slabs has become a trend.

[0003] Utility model patent application CN202310443873.9 discloses a "prestressed concrete composite slab base plate with three layers of reinforcement and its preparation method." The method employs a three-layer reinforcement arrangement, ensuring that the resultant force center of unidirectional or bidirectional prestressing is located on the center plane of the concrete thickness direction of the base plate or has minimal offset, thus preventing warping and cracking of the precast base plate. The concrete composite slab base plate prepared by this utility model can use traditional hooks and concrete protective layer spacers, or it can use a hook assembly that integrates the hook and spacers. The hook assembly improves the anchoring effect and lifting reliability of the hook, facilitates hook binding and fixing, prevents spacer movement causing spacer failure, ensures the spacers perform the function expected of traditional concrete protective layer spacers, and guarantees accurate concrete protective layer thickness. Using this utility model to prepare the concrete composite slab base plate offers a simple and mature process, high quality, high efficiency, low cost, safe and reliable lifting, and requires a large spacing for temporary construction supports, saving on support costs and thus reducing overall construction costs. However, the three-layer reinforcement layout is still too complex and has too many intersections, and the calculated value of the concrete cover thickness is too large in both directions, so it should be improved. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a prestressed concrete composite slab base plate that only requires two layers of reinforcement to achieve bidirectional prestressed steel bars forming compressive prestress at the center of the cross section. The production process is simple, and the composite slab base plate has good quality, low cost, and excellent crack resistance.

[0005] The technical solution of this utility model is as follows: a prestressed concrete composite slab base plate includes: a two-way prestressed concrete slab, longitudinal prestressed steel bars, transverse prestressed steel bars, concrete and a trench. The transverse prestressed steel bars are arranged on the horizontal axis of the longitudinal section of the longitudinal trench of the two-way prestressed concrete slab, and the longitudinal prestressed steel bars are arranged on the horizontal axis of the transverse section of the two-way prestressed concrete slab. The upper surface of the concrete is provided with a longitudinal trench.

[0006] Furthermore, the grooves on the biaxial prestressed concrete slab are set along the longitudinal length of the biaxial prestressed concrete slab.

[0007] Furthermore, the longitudinal and transverse prestressed steel bars of the two-way prestressed concrete slab are interchanged in their upper and lower layer positions. In this case, the trench is set along the transverse length of the two-way prestressed concrete slab.

[0008] The beneficial effects of this utility model are as follows:

[0009] By employing a trenching method, with double-layer reinforcement, the centers of the bidirectional prestressed steel bars are positioned at the center of the horizontal axis of the bidirectional prestressed concrete slab section. This results in axial compression of the transverse section of the bidirectional prestressed concrete slab and axial compression of the longitudinal section at the trench location, effectively preventing warping and cracking of the prestressed concrete composite slab base. The preparation of the bidirectional prestressed concrete composite slab base using this invention is simple, produces high-quality, efficient, and low-cost processes. Attached Figure Description

[0010] Figure 1 This is a top view of the bidirectional prestressed concrete slab in this utility model;

[0011] Figure 2 This is a schematic diagram of the transverse cross-section of the bidirectional prestressed concrete slab in this utility model;

[0012] Figure 3 This is a schematic diagram of the longitudinal section of the bidirectional prestressed concrete slab at the longitudinal groove in this utility model;

[0013] In the diagram, 1-two-way prestressed concrete slab, 2-longitudinal prestressed steel bar, 3-transverse prestressed steel bar, 4-concrete, 5-trench. Detailed Implementation

[0014] It should be noted that in the description of this utility model, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0015] In this utility model, unless otherwise explicitly specified and limited, the terms "setting," "installing," "connecting," and "joining" should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; a connection can be a mechanical connection or an electrical connection; a joint can be a direct connection or an indirect connection through an intermediate medium, and can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0016] A prestressed concrete composite slab base includes a bidirectional prestressed concrete slab 1, longitudinal prestressed steel bars 2, transverse prestressed steel bars 3, concrete 4, and a trench 5. The bidirectional prestressed concrete slab 1 is composed of the longitudinal prestressed steel bars 2, the transverse prestressed steel bars 3, the concrete 4, and the trench 5. The longitudinal prestressed steel bars 2 are arranged along the horizontal axis of the transverse section of the bidirectional prestressed concrete slab 1, extending or not extending from the end of the bidirectional prestressed concrete slab 1. The transverse prestressed steel bars 3 are arranged along the horizontal axis of the longitudinal section of the longitudinal trench of the bidirectional prestressed concrete slab 1, extending or not extending from the end of the bidirectional prestressed concrete slab 1. The upper surface of the concrete 4 is provided with the trench 5. The trench 5 is arranged along the longitudinal length of the bidirectional prestressed concrete slab 1.

[0017] The longitudinal prestressed steel bars 2 and transverse prestressed steel bars 3 in the bidirectional prestressed concrete slab 1 can be interchanged in their upper and lower layer positions. In this case, the trench 5 is set along the transverse length of the bidirectional prestressed concrete slab 1.

[0018] A prestressed concrete composite slab base plate and its preparation method are disclosed. The method for preparing the prestressed concrete composite slab base plate includes the following steps, which are performed sequentially:

[0019] Step 1: Arranging and tensioning prestressed steel bars

[0020] After cleaning the formwork and installing the side formwork, the prestressed steel bars are arranged. First, the transverse prestressed steel bars 3 are arranged at the horizontal axis of the longitudinal section of the longitudinal groove on the two-way prestressed concrete slab 1. Then, the longitudinal prestressed steel bars 2 are arranged at the horizontal axis of the transverse section of the two-way prestressed concrete slab 1. The longitudinal prestressed steel bars 2 and the transverse prestressed steel bars 3 are tensioned and locked.

[0021] Step 2: Pour concrete, cure, and demold.

[0022] Pour concrete 4, make longitudinal grooves on the surface of concrete 4, cure concrete 4, and after concrete 4 reaches the design strength, release the prestress of longitudinal prestressed steel bars 2 and transverse prestressed steel bars 3, remove the side formwork, and demold the two-way prestressed concrete slab 1 to complete the preparation of the prestressed concrete composite slab bottom plate.

[0023] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in this utility model, and within the spirit and principles of this utility model, should be included within the protection scope of this utility model. Furthermore, all content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims

1. A prestressed concrete composite slab base plate, characterized in that, include: The bidirectional prestressed concrete slab (1), longitudinal prestressed steel bars (2), transverse prestressed steel bars (3), concrete (4) and trench (5) are provided. The transverse prestressed steel bars (3) are arranged on the horizontal axis of the longitudinal section of the longitudinal trench of the bidirectional prestressed concrete slab (1), and the longitudinal prestressed steel bars (2) are arranged on the horizontal axis of the transverse section of the bidirectional prestressed concrete slab (1). The upper surface of the concrete (4) is provided with trench (5).

2. The prestressed concrete composite slab bottom plate according to claim 1, characterized in that, The trench (5) is set along the longitudinal length of the bidirectional prestressed concrete slab (1).

3. The prestressed concrete composite slab base plate according to claim 1, characterized in that, The longitudinal prestressed steel bars (2) and the transverse prestressed steel bars (3) are interchanged in the upper and lower layers. At this time, the trench (5) is set along the transverse length of the two-way prestressed concrete slab (1).

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