Anti-cracking assembly type laminated slab structure

Abstract

The utility model discloses an anti-cracking assembly type laminated slab structure which comprises a prefabricated bottom plate, the prefabricated bottom plate is of a concrete structure, and a two-way steel bar set is arranged in the prefabricated bottom plate. A distribution steel bar group is arranged in the post-pouring layer, and one end of the distribution steel bar group is pre-connected to the interior of the prefabricated bottom plate; the buffer layer is located between the prefabricated bottom plate and the post-pouring layer, and relates to the technical field of assembly type laminated slabs, the buffer layer is located between the prefabricated bottom plate and the post-pouring layer and made of elastic materials, the buffer layer can absorb stress generated by concrete shrinkage and temperature change, constraint between the prefabricated bottom plate and the post-pouring layer is reduced, and the prefabricated bottom plate and the post-pouring layer are prevented from being damaged. Therefore, the possibility of crack generation is reduced.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated composite slab technology, specifically a crack-resistant prefabricated composite slab structure. Background Technology

[0002] Prefabricated composite slabs, commonly used floor components in prefabricated buildings, offer advantages such as fast construction speed and easy quality control. However, in practical engineering applications, composite slabs are prone to cracking, which not only affects the appearance quality of the structure but may also reduce its durability and safety.

[0003] The main causes of cracking in composite slabs include: during concrete pouring and curing, factors such as temperature stress generated by cement hydration heat and concrete shrinkage deformation can easily lead to tensile stress inside the composite slab. When the tensile stress exceeds the tensile strength of the concrete, cracks will appear. In addition, if the connection points are not properly handled during the splicing and installation of prefabricated composite slabs, stress concentration can occur, which can also easily cause cracks. At the same time, when the composite slab is subjected to load, uneven stress in different parts may also cause local cracking.

[0004] Existing crack prevention measures, such as increasing the steel reinforcement ratio and setting expansion joints, can alleviate cracking problems to some extent, but the effect is not ideal and may increase construction costs and difficulties. Utility Model Content

[0005] The purpose of this utility model is to provide a crack-resistant prefabricated composite panel structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A crack-resistant prefabricated composite slab structure, including

[0008] A precast base slab, wherein the precast base slab is a concrete structure and the interior of the precast base slab is provided with bidirectional steel reinforcement.

[0009] The post-cast layer is provided with distributed steel reinforcement groups inside the post-cast layer, and one end of the distributed steel reinforcement groups is pre-connected to the inside of the precast base slab.

[0010] A buffer layer is located between the precast base slab and the post-cast layer.

[0011] In a preferred embodiment of this utility model, the precast base plate is made of high-strength concrete, and the bidirectional steel reinforcement group includes a first U-shaped steel, which is provided in several parts, and a second U-shaped steel is snapped onto the bottom end of the first U-shaped steel.

[0012] In a preferred embodiment of this utility model, the top outer wall of the second U-shaped steel is uniformly welded with a vertical pole, which is engaged and positioned with the first U-shaped steel. The first U-shaped steel and the second U-shaped steel are two layers symmetrically distributed vertically.

[0013] In a preferred embodiment of this utility model, the top of the precast base plate and the surfaces of the first U-shaped steel and the second U-shaped steel are all rough surfaces.

[0014] In a preferred embodiment of this utility model, the distributed steel reinforcement group includes a first transverse reinforcement, which has a plurality of first transverse reinforcements, and a first longitudinal reinforcement is welded to the top of the first transverse reinforcement, which also has a plurality of first longitudinal reinforcements.

[0015] In a preferred embodiment of this utility model, the first horizontal rib and the first vertical rib are distributed in a cross shape, and the top of the first vertical rib is uniformly welded to the second upright.

[0016] In a preferred embodiment of this utility model, the bottom of the second upright is welded to a first horizontal rib, and the top of the second upright is welded to a second longitudinal rib.

[0017] In a preferred embodiment of this utility model, the post-cast layer is provided with a crack-resistant steel wire mesh, and the crack-resistant steel wire mesh is provided in two layers above and below.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0019] 1. By adopting measures such as micro-expansion concrete post-cast layer, crack-resistant mesh and buffer layer, the shrinkage deformation of concrete is effectively compensated, stress is dispersed, crack propagation is prevented, and the crack resistance of composite slab is significantly improved.

[0020] 2. The connecting steel bars tightly connect the precast base slab and the post-cast layer together to form an integral structure, which improves the load-bearing capacity and integrity of the composite slab;

[0021] 3. By setting a buffer layer between the precast base slab and the post-cast layer, and making it of elastic material, the buffer layer can absorb the stress generated by concrete shrinkage and temperature changes, reduce the constraint between the precast base slab and the post-cast layer, and thus reduce the possibility of cracks. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the main structure of a crack-resistant prefabricated composite slab structure.

[0024] Figure 2 This is a schematic diagram of the exploded structure in a crack-resistant prefabricated composite slab structure.

[0025] Figure 3 This is a schematic diagram of a bidirectional steel reinforcement assembly in a crack-resistant prefabricated composite slab structure.

[0026] Figure 4 This is a schematic diagram of a distributed steel reinforcement group structure in a crack-resistant prefabricated composite slab structure.

[0027] Figure 5 This is a schematic diagram of the crack-resistant mesh structure in a crack-resistant prefabricated composite slab structure.

[0028] In the figure: precast base plate 100, first U-shaped steel 110, second U-shaped steel 120, upright 121, buffer layer 200, first horizontal rib 210, first longitudinal rib 211, second upright 212, second longitudinal rib 213, post-cast layer 300, crack-resistant wire mesh 310. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] Example 1: As Figures 1-5 ,include

[0031] The precast base slab 100 is a concrete structure and has bidirectional steel reinforcement bars inside.

[0032] The post-cast layer 300 has a distribution steel reinforcement group inside, and one end of the distribution steel reinforcement group is pre-connected to the inside of the precast base slab 100.

[0033] Buffer layer 200 is located between precast base plate 100 and post-cast layer 300.

[0034] The specific application scenario of this embodiment is as follows: The upper surface of the precast base plate is provided with a rough surface to enhance the bonding force between the precast base plate and the post-cast layer. The post-cast layer 300 is located above the precast base plate and is poured with micro-expansion concrete. During the hardening process, the micro-expansion concrete will generate a certain expansion stress, which can compensate for the shrinkage deformation of the concrete and reduce the generation of cracks. The buffer layer 200 is set between the precast base plate 100 and the post-cast layer 300 and is made of elastic material, such as rubber pads or foam plastic boards. The buffer 200 can absorb the stress generated by concrete shrinkage and temperature changes, reduce the constraint between the precast base plate and the post-cast layer, and thus reduce the possibility of crack generation.

[0035] Example 2: As Figures 1-3 The precast base plate 100 is made of high-strength concrete. The bidirectional steel reinforcement includes a first U-shaped steel 110, which is provided in several parts. The bottom end of the first U-shaped steel 110 is snapped with a second U-shaped steel 120. The top outer wall of the second U-shaped steel 120 is uniformly welded with uprights 121. The uprights 121 are engaged with the first U-shaped steel 110 for positioning. The first U-shaped steel 110 and the second U-shaped steel 120 are distributed in two symmetrical layers. The top of the precast base plate 100 and the surfaces of the first U-shaped steel 110 and the second U-shaped steel 120 are rough surfaces.

[0036] The specific application scenario of this embodiment is as follows: the standard value of the compressive strength of high-strength concrete reaches 80MPa. By setting up bidirectional steel reinforcement groups, the structural strength of the precast base plate 100 is comprehensively improved, the compressive strength and crack prevention effect are enhanced, and the internal structure of the precast base plate 100 is made more compact. By setting up the first U-shaped steel 110 and the second U-shaped steel 120 that are staggered vertically, the crack resistance effect is effectively enhanced.

[0037] Example 3: As Figure 4 The distributed steel reinforcement group includes a first horizontal bar 210, and there are several first horizontal bars 210. The top of the first horizontal bar 210 is welded with a first longitudinal bar 211, and there are several first longitudinal bars 211. The first horizontal bars 210 and the first longitudinal bars 211 are distributed in a cross shape. The top of the first longitudinal bars 211 is uniformly welded to a second upright bar 212. The bottom of the second upright bar 212 is welded to a first horizontal bar 210. The top of the second upright bar 212 is welded to a second longitudinal bar 213. The second upright bar 212 extends through the buffer layer 200 into the interior of the post-cast layer 300.

[0038] The specific application scenario of this embodiment is as follows: by setting up distributed steel reinforcement groups to enhance the tightness of the connection between the precast base slab 100, the buffer layer 200 and the post-cast layer 300, the precast base slab 100, the buffer layer 200 and the post-cast layer 300 are integrated into a single structure, thereby improving the stability of the prefabricated composite slab structure.

[0039] Example 4: Figure 1 and Figure 2 The post-cast layer 300 is equipped with crack-resistant steel wire mesh 310, which has two layers on the top and bottom.

[0040] The specific application scenario of this embodiment is as follows: by setting anti-crack wire mesh 310 inside the post-cast layer 300 to enhance the mechanical strength of the post-cast layer 300, the anti-crack wire mesh 310 is set inside the post-cast layer, above the distributed reinforcing bars. The anti-crack wire mesh 310 is made of high-strength steel wire mesh or fiber mesh, which has good tensile properties. The anti-crack wire mesh 310 can disperse the stress inside the concrete, prevent the expansion of cracks, and improve the crack resistance of the post-cast layer.

[0041] The working principle of this utility model is as follows: When used by those skilled in the art, a precast base slab 100 is poured with high-strength concrete. Bidirectional steel reinforcement groups are evenly distributed inside the precast base slab 100, including a first U-shaped steel 110 and a second U-shaped steel 120 that are intersected, so that the uprights 121 cross on the outer wall of the first U-shaped steel 110. At the same time, the combination formed by the first U-shaped steel 110 and the second U-shaped steel 120 is arranged in two layers, one above the other. After the bottom structure of the precast base slab 100 is poured, the distributed steel reinforcement groups are arranged on the top of the precast base slab 100, and the pouring of the precast base slab 100 is continued. Then, a buffer layer 200 is fixedly connected to the top of the precast base slab 100, so that the second uprights 212 pass through the buffer layer 200. Subsequently, a post-poured layer 300 is poured on the top of the buffer layer 200 with micro-expansion concrete, and a crack-resistant wire mesh 310 is set inside the post-poured layer 300. The crack-resistant wire mesh 310 is arranged in two layers, one above the other.

[0042] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A crack-resistant prefabricated composite slab structure, characterized in that, include A precast base slab (100) is a concrete structure, and the interior of the precast base slab (100) is provided with bidirectional steel reinforcement. Post-cast layer (300), wherein a distribution steel bar group is provided inside the post-cast layer (300), and one end of the distribution steel bar group is pre-connected to the inside of the precast base plate (100); A buffer layer (200) is located between the precast base plate (100) and the post-cast layer (300).

2. The anti-cracking prefabricated composite slab structure according to claim 1, characterized in that, The precast base plate (100) is made of high-strength concrete. The bidirectional steel reinforcement group includes a first U-shaped steel (110). Several first U-shaped steels (110) are provided. The bottom end of the first U-shaped steel (110) is snapped with a second U-shaped steel (120).

3. The anti-cracking prefabricated composite slab structure according to claim 2, characterized in that, The top outer wall of the second U-shaped steel (120) is uniformly welded with uprights (121). The uprights (121) are engaged and positioned with the first U-shaped steel (110). The first U-shaped steel (110) and the second U-shaped steel (120) are two layers symmetrically distributed vertically.

4. The anti-cracking prefabricated composite slab structure according to claim 3, characterized in that, The top of the precast base plate (100), the surface of the first U-shaped steel (110) and the second U-shaped steel (120) are all rough surfaces.

5. The anti-cracking prefabricated composite slab structure according to claim 1, characterized in that, The distributed steel reinforcement group includes a first horizontal bar (210), and there are several first horizontal bars (210). A first longitudinal bar (211) is welded to the top of the first horizontal bar (210), and there are several first longitudinal bars (211).

6. The anti-cracking prefabricated composite slab structure according to claim 5, characterized in that, The first horizontal bar (210) and the first vertical bar (211) are distributed in a cross shape, and the top of the first vertical bar (211) is uniformly welded to the second upright (212).

7. The anti-cracking prefabricated composite slab structure according to claim 6, characterized in that, The bottom of the second upright (212) is welded to the first horizontal rib (210), the top of the second upright (212) is welded to the second longitudinal rib (213), and the second upright (212) extends through the buffer layer (200) into the interior of the post-cast layer (300).

8. The anti-cracking prefabricated composite slab structure according to claim 1, characterized in that, The post-cast layer (300) is provided with crack-resistant wire mesh (310), and the crack-resistant wire mesh (310) has two layers on the top and bottom.

Images