A connecting structure of a post-cast strip of a laminated slab

Abstract

This utility model discloses a post-cast strip connection structure for composite slabs. The post-cast strip connection structure includes two interconnected precast base slabs. Each precast base slab includes a rigid layer and a thermal insulation and sound insulation layer. A base slab reinforcement bar extends from one side of the rigid layer. The thermal insulation and sound insulation layer is located on the bottom side of the rigid layer, with one side flush with the rigid layer and the other side flush with the end of the base slab reinforcement bar. When the two precast base slabs are connected, the corresponding thermal insulation and sound insulation layers of the two precast base slabs abut against each other, forming a groove structure between the two precast base slabs. The corresponding base slab reinforcement bars of the two precast base slabs are connected to each other in the groove structure via additional lap reinforcement bars, and a post-cast concrete structure is poured into the groove structure. Through the structural design of this post-cast strip connection structure for composite slabs, the base slab reinforcement bars are protected, and formwork is no longer required during the pouring of the post-cast strip.

Description

Technical Field

[0001] This utility model belongs to the field of prefabricated building technology, and in particular relates to a post-cast strip connection structure for composite slabs. Background Technology

[0002] Building energy consumption accounts for more than 40% of total energy consumption, ranking first among all energy consumption categories. Consequently, the country's requirements for green buildings are constantly increasing. Prefabricated buildings meet the development requirements of energy conservation, emission reduction, and green construction, and vigorously developing prefabricated buildings is a strategic measure for my country to promote green development. Against this backdrop, various regions are actively promoting green buildings and prefabricated buildings.

[0003] Current standard specifications for composite slab connection construction:

[0004] Prefabricated buildings can be classified by the materials of their main structural components, including prefabricated concrete buildings, prefabricated steel structure buildings, and prefabricated wood structure buildings. Among them, prefabricated concrete buildings are currently the dominant development technology system in my country, accounting for more than 65%.

[0005] Most current prefabricated concrete structures are based on the principle of equivalent cast-in-place design, where precast components are connected to form a whole through post-cast concrete, i.e., prefabricated monolithic structures. For floor slabs, composite floor slabs are required. Current standards specify the joint type (straight-line extended reinforcement) for monolithic joints in two-way composite floor slabs as follows: Figure 1 As shown, its corresponding precast base plate is as follows: Figure 2 As shown.

[0006] This type of joint construction has the following problems:

[0007] 1) The ribs 4 on the side bottom plate at the joint are too long, which are easily damaged and deformed during transportation, storage and hoisting, and affect the construction operation when assembling the floor slab.

[0008] 2) When constructing the post-construction concrete composite layer, the precast base slab does not completely replace the on-site formwork. On-site formwork is still required at the joints before the post-construction strip can be poured, thus reducing the degree of prefabrication. Because it is difficult to tightly connect the formwork and the precast base slab at the joints, grout leakage and formwork bursting are prone to occur, affecting the construction quality of the floor slab. Utility Model Content

[0009] The purpose of this utility model is to overcome the problems of the prior art by disclosing a post-cast strip connection structure for composite slabs. Through the structural design of this post-cast strip connection structure for composite slabs, the reinforcing bars of the bottom plate are protected, and no formwork is required when the post-cast strip is poured.

[0010] The objective of this utility model is achieved through the following technical solution:

[0011] A post-cast strip connection structure for composite slabs, the post-cast strip connection structure comprising two interconnected precast base plates;

[0012] The precast base slab includes a rigid layer and a thermal insulation and sound insulation layer. A base slab extension rib extends from one side of the rigid layer. The thermal insulation and sound insulation layer is disposed on the bottom side of the rigid layer, and one side of the thermal insulation and sound insulation layer is flush with the rigid layer, while the other side is flush with the end of the base slab extension rib.

[0013] When two precast base slabs are connected to each other, the corresponding thermal insulation and sound insulation layers of the two precast base slabs come into contact with each other, forming a groove structure between the two precast base slabs. The corresponding base slab reinforcement bars of the two precast base slabs in the groove structure are connected to each other by additional lap reinforcement bars, and a concrete structure is poured into the groove structure afterward.

[0014] According to a preferred embodiment, the surface of the thermal insulation and sound insulation layer is provided with a protective layer.

[0015] According to a preferred embodiment, the protective layer is a fiber polymer mortar protective layer.

[0016] According to a preferred embodiment, the thermal insulation and sound insulation layer is made of foamed cement.

[0017] According to a preferred embodiment, the thermal insulation and sound insulation layer has a built-in fiberglass mesh.

[0018] According to a preferred embodiment, the rigid layer is precast by concrete pouring.

[0019] According to a preferred embodiment, the two ends of the additional lap bar are connected to the bottom plate reinforcing bar by binding wire or welding.

[0020] According to a preferred embodiment, an overlapping layer is also cast on the top sides of the two precast base plates.

[0021] According to a preferred embodiment, the composite layer is poured simultaneously with the concrete structure in the groove structure between the two precast base plates.

[0022] The aforementioned main solution of this utility model and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted by this utility model and for which protection is sought. Those skilled in the art, after understanding the solution of this utility model, will realize, based on existing technology and common knowledge, that there are many combinations, all of which are technical solutions to be protected by this utility model; therefore, they are not exhaustively listed here.

[0023] The beneficial effects of this utility model are:

[0024] a) Eliminate on-site construction formwork at the joints of post-cast concrete in composite floor slabs, and achieve complete replacement of on-site construction formwork by precast base slabs;

[0025] b) The connecting steel bars of the precast base slab do not protrude from the base slab components, which protects them from deformation during transportation, storage and hoisting, and also facilitates construction operations during floor slab assembly.

[0026] c) Since the floor slab construction does not require formwork, the post-cast concrete at the joints can be included in the calculation of the single-unit assembly rate index, which widens the width of the post-cast strip of the precast base slab and is beneficial to the integrity of the composite floor slab. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a traditional composite slab structure;

[0028] Figure 2 This is a structural diagram of the precast base plate in a traditional composite slab.

[0029] Figure 3 This is a schematic diagram of the post-cast strip connection structure of the composite slab in this application;

[0030] Figure 4 This is a structural schematic diagram of the precast base plate of this application;

[0031] Among them, 1-precast base slab, 2-post-pouring strip, 3-overlapping layer, 4-base slab reinforcement, 10-precast base slab, 11-rigid layer, 12-base slab reinforcement, 13-thermal insulation and sound insulation layer, 14-protective layer, 20-overlapping layer, 30-additional lap reinforcement. Detailed Implementation

[0032] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] Furthermore, it should be noted that unless otherwise specified, the specific structures, connections, positions, power sources, etc. involved in this utility model are all things that a person skilled in the art can know without creative effort based on the prior art.

[0038] Example 1

[0039] refer to Figure 3 and Figure 4 As shown, this application discloses a post-cast strip connection structure for composite slabs, which includes two interconnected precast base plates 10 and a composite layer 20 cast on the top side of the two precast base plates.

[0040] Preferably, the precast base plate 10 includes a rigid layer 11 and a thermal insulation and sound insulation layer 13. A base plate rib 12 extends out from one side of the rigid layer 11. The thermal insulation and sound insulation layer 13 is disposed on the bottom side of the rigid layer 11, and one side of the thermal insulation and sound insulation layer 13 is flush with the rigid layer 11, while the other side is flush with the end of the base plate rib 12.

[0041] Preferably, the surface of the thermal insulation and sound insulation layer 13 is provided with a protective layer 14. In this embodiment, the protective layer 14 is a fiber polymer mortar protective layer.

[0042] Preferably, the thermal insulation and sound insulation layer 13 is made of foamed cement. Further, the foamed cement of the thermal insulation and sound insulation layer 13 contains embedded fiberglass mesh. The rigid layer 11 is precast by concrete pouring.

[0043] Because the thermal insulation and sound insulation layer 13 of the precast base slab 10 (a reinforced surface structure consisting of cement foam insulation board, polymer fiber mortar, and built-in alkali-resistant fiberglass mesh) has high strength, it extends out of the concrete base slab (i.e., rigid layer 11) with the same extension length as the base slab reinforcement 12. This ensures that the connecting reinforcement of the precast base slab 10 does not extend out of the base slab component, thus protecting it from deformation during transportation, storage, and hoisting, and facilitating construction operations during floor slab assembly.

[0044] When the two precast base plates 10 are connected to each other, the thermal insulation and sound insulation layers 13 corresponding to the two precast base plates 10 abut against each other, forming a groove structure between the two precast base plates 10. In the groove structure, the base plate reinforcing bars 12 corresponding to the two precast base plates 10 are connected to each other by additional lap bars 30, and a concrete structure (i.e., a post-cast strip) is poured into the groove structure.

[0045] That is, during the on-site splicing construction of composite floor slabs, the extended thermal insulation and sound insulation layer 13 can replace the construction formwork of the post-poured concrete part, and only one support is needed to carry out the post-pouring operation.

[0046] Preferably, the composite layer 20 is poured simultaneously with the concrete structure in the groove structure between the two precast base plates 10, so that the composite layer 20 and the post-cast strip form an integral structure, which helps to improve the structural stability of the post-cast strip connection structure of the composite slab.

[0047] Preferably, the two ends of the additional lap joint 30 are connected to the bottom plate reinforcing bar 12 by binding wire or welding.

[0048] The post-cast strip connection structure of the composite slab in this application utilizes the inherent rigidity of the thermal insulation and sound insulation layer 13 in the precast base slab 10 and the properties of the formwork to extend it into a concrete slab as a construction formwork for the post-cast strip. This simplifies the installation and construction process, facilitates production and transportation, optimizes the structure of the prefabricated floor slab, and reduces the overall cost of the floor slab.

[0049] In other words, through the structural design of this application, the on-site construction formwork at the joint of the post-cast concrete of the composite floor slab is eliminated, and the precast base slab completely replaces the on-site construction formwork; the connecting steel bars of the precast base slab do not protrude from the base slab components, are protected during transportation, storage and hoisting, are not easily deformed, and are also convenient for construction operations during floor slab assembly; since the floor slab construction does not require formwork, the post-cast concrete at the joint can be included in the calculation of the single assembly rate index, which widens the post-cast strip of the precast base slab and is beneficial to the integrity of the composite floor slab.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A connecting structure of a post-cast strip of a laminated slab, characterized by, The post-cast strip connection structure of the composite slab includes two interconnected precast base plates (10); The precast base plate (10) includes a rigid layer (11) and a thermal insulation and sound insulation layer (13). A base plate rib (12) extends out from one side of the rigid layer (11). The thermal insulation and sound insulation layer (13) is disposed on the bottom side of the rigid layer (11), and one side of the thermal insulation and sound insulation layer (13) is flush with the rigid layer (11), and the other side is flush with the end of the base plate rib (12). When the two precast base plates (10) are connected to each other, the corresponding thermal insulation and sound insulation layers (13) of the two precast base plates (10) abut against each other and form a groove structure between the two precast base plates (10). The corresponding base plate reinforcing bars (12) of the two precast base plates (10) in the groove structure are connected to each other by additional lap bars (30), and a concrete structure is poured into the groove structure.

2. The post-cast strip connection structure of the composite slab as described in claim 1, characterized in that, The surface of the thermal insulation and sound insulation layer (13) is provided with a protective layer.

3. The connecting structure of the post-cast strip of the composite slab according to claim 2, wherein The protective layer is a fiber polymer mortar protective layer.

4. The connected structure of the composite slab post-cast strip according to claim 1, wherein The thermal insulation and sound insulation layer (13) is made of foamed cement.

5. The connected construction of the composite slab post-cast strip according to claim 4, characterized in that, The thermal insulation and sound insulation layer (13) has a fiberglass mesh inside.

6. The connected construction of the composite slab post-cast strip according to claim 1, characterized in that, The rigid layer (11) is obtained by precast concrete pouring.

7. The connected construction of the composite slab post-cast strip according to claim 1, characterized in that, The two ends of the additional lap bar (30) are connected to the bottom plate reinforcing bar (12) by binding wire or welding.

8. The post-cast strip connection structure of the composite slab as described in claim 1, characterized in that, The top sides of the two precast base slabs (10) are also filled with composite layers (20).

9. The connected construction of the composite slab post-cast strip according to claim 8, characterized in that, The concrete structure in the groove structure between the composite layer (20) and the two precast base plates (10) is poured simultaneously.

Images