Prefabricated bottom plate wet method rigid connection structure of assembled laminated slab and assembled building

Abstract

The utility model provides a kind of wet method rigid joint connecting structure and assembled building of fabricated composite slab prefabricated bottom plate, and the wet method rigid joint connecting structure of this fabricated composite slab prefabricated bottom plate includes two fabricated composite slab prefabricated bottom plates, connecting piece, cast-in-place concrete connecting section and fabricated composite slab whole pouring layer, connecting piece includes steel bottom plate and fastener, steel bottom plate is below two fabricated composite slab prefabricated bottom plates, fastener passes through two fabricated composite slab prefabricated bottom plates and head is located inside fabricated composite slab whole pouring layer to connect two fabricated composite slab prefabricated bottom plates, present cast-in-place concrete connecting section is equipped between two fabricated composite slab prefabricated bottom plates, present cast-in-place concrete connecting section is above steel bottom plate.This connecting structure, using the prefabricated bottom plate of existing ordinary span fabricated composite slab is spliced, so as to increase the span of composite slab, relative to existing pure cast-in-place floor slab, can reduce cast-in-place workload, reduce the amount of on-site construction, with the advantage that on-site construction is fast.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building structure technology, and in particular to a wet rigid connection structure for prefabricated composite slab base plates and prefabricated buildings. Background Technology

[0002] With the increasing demand for "good houses," people's needs for spaciousness and personalization in residences have grown. For example, there is a need for living and dining rooms with large spans (over 6m) or more, or flexible partitions between adjacent rooms (such as two adjacent bedrooms): some floor users need to be divided into two rooms, some floor users need to be combined into one room, or the location of room partitions needs to be inconsistent. This kind of flexibility requirement also requires the span to be over 6m.

[0003] Due to cost control for transportation and hoisting, the span of prefabricated ordinary composite slabs on the market is generally no more than 5m, which limits the development and application of prefabricated buildings. Currently, floor slabs with such requirements are all cast-in-place, and excessive pouring volume seriously affects on-site construction efficiency. Utility Model Content

[0004] The main purpose of this utility model is to provide a prefabricated composite slab wet rigid connection structure and prefabricated building, which aims to meet the needs of large-span floor slabs while reducing the amount of on-site pouring.

[0005] To achieve the above objectives, this utility model provides a wet-method rigid connection structure for precast composite slab base plates, comprising two precast composite slab base plates, a connector connecting the two precast composite slab base plates, a cast-in-place concrete connection section located between the two precast composite slab base plates, and a monolithic precast composite slab layer located above the two precast composite slab base plates.

[0006] The connector includes a steel base plate and multiple fasteners fixed to the top surface of the steel base plate. The steel base plate is located below the two precast composite slab base plates. The fasteners pass through the two precast composite slab base plates and their heads are located inside the integral cast-in-place layer of the precast composite slab to connect the two precast composite slab base plates. A cast-in-place concrete connection section is provided between the two precast composite slab base plates, and the cast-in-place concrete connection section is located above the steel base plate.

[0007] Preferably, the two precast composite slab base plates have reinforcing bars extending outward at their ends that are close to each other, and the reinforcing bars of the two precast composite slab base plates are fixedly connected and located inside the cast-in-place concrete connection section.

[0008] Preferably, after the reinforcing bars extending outward from the two precast base plates of the assembled composite slab are connected by a mechanical connection joint, the mechanical connection joint is located inside the cast-in-place concrete connection section.

[0009] Preferably, the fasteners include multiple bolts welded to the steel base plate, and both prefabricated base plates of the assembled composite slabs are provided with bolt holes for the bolts to pass through.

[0010] Preferably, the prefabricated composite slab base plate wet rigid connection structure further includes a steel cover plate located above the prefabricated composite slab base plate. Bolts pass through the prefabricated composite slab base plate and the steel cover plate in sequence and are then tightened by nuts. The steel cover plate and nuts are located inside the integral casting layer of the prefabricated composite slab.

[0011] Preferably, the top and bottom surfaces of the two prefabricated composite slab base plates at their respective ends are provided with grooves to accommodate the steel cover plate and the steel base plate, respectively.

[0012] Preferably, the top surface of the steel base plate is coated with an epoxy resin structural adhesive layer; the gap between the steel cover plate and the fasteners is filled with epoxy resin structural adhesive.

[0013] Preferably, the cast-in-place concrete connection section is densely filled with cement grout or fine aggregate concrete of a grade one grade higher than that of the precast composite slab base plate.

[0014] Preferably, the thickness of both the steel cover plate and the steel base plate does not exceed 10 mm.

[0015] This utility model also proposes a prefabricated building, including the above-mentioned prefabricated composite slab precast base plate wet rigid connection structure.

[0016] The prefabricated composite slab wet rigid connection structure for precast base plate proposed in this utility model has the following advantages:

[0017] 1. The precast base plate of the existing ordinary span prefabricated composite slab is spliced ​​to increase the span of the composite slab, which can meet the large span requirements of some prefabricated buildings. Compared with the existing pure cast-in-place floor slab, it can reduce the amount of cast-in-place work and reduce the amount of on-site construction, and has the advantage of rapid on-site construction.

[0018] 2. This connection structure adopts steel plate and steel bar mechanical connection joints and fasteners in an assembled manner. It utilizes the shear resistance of the fasteners and the tensile resistance of the mechanical connection joints to bear the axial tension and compression in the plane of the precast composite slab, thereby improving the overall structural stability.

[0019] 3. The bending moment of this connection structure is achieved by the steel base plate: the steel base plate is connected to the prefabricated composite slab base plate using bolts and epoxy resin structural adhesive, and the tensile strength of the steel base plate is used to achieve a rigid connection at the joint. Moreover, the tensile strength of the steel plate is much greater than that of concrete, resulting in higher joint strength.

[0020] 4. Bolts and nuts form shear keys within the floor slab to ensure that the contact surface between the precast base plate of the prefabricated composite slab and the integral cast-in-place layer at the connection does not slip or fail;

[0021] 5. This connection structure utilizes high-strength steel and adopts a fully prefabricated connection concept, featuring high node strength, greenness, low carbon emissions, and high efficiency. At the same time, it does not increase transportation and hoisting costs, and is convenient to construct with a high degree of industrialization.

[0022] 6. This connection structure has the advantages of convenient material procurement, no need for special irregular processing, convenient installation, reliable stress, and low cost. Attached Figure Description

[0023] Figure 1 This is a cross-sectional structural schematic diagram of the wet rigid connection structure of the prefabricated base plate of the assembled composite slab of this utility model.

[0024] Figure 2 This is a schematic diagram of the planar structure of the connecting parts in the wet rigid connection structure of the prefabricated composite slab base plate of this utility model.

[0025] In the figure, 1: Precast base plate of prefabricated composite slab; 2: Bottom reinforcing steel of precast base plate 1 of prefabricated composite slab; 3: Integral layer of prefabricated composite slab; 4: Top reinforcing steel of integral layer of prefabricated composite slab; 5: Mechanical connection joint; 6: Steel base plate; 7: Bolt; 8: Nut; 9: Steel cover plate; 10: Cast-in-place concrete connection section.

[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0028] It should be noted that in the description of this utility model, the terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] This invention proposes a wet rigid connection structure for prefabricated composite slab base plates.

[0030] Reference Figure 1and Figure 2 In this preferred embodiment, a wet-method rigid connection structure for prefabricated composite slab base plates includes two prefabricated composite slab base plates 1, a connector connecting the two prefabricated composite slab base plates 1, a cast-in-place concrete connection section 10 located between the two prefabricated composite slab base plates 1, and a prefabricated composite slab monolithic layer 3 located above the two prefabricated composite slab base plates 1.

[0031] The connector includes a steel base plate 6 and multiple fasteners fixed to the top surface of the steel base plate 6. The steel base plate 6 is located below the two precast composite slab base plates 1. The fasteners pass through the two precast composite slab base plates 1 and their heads are located inside the integral cast-in-place layer 3 of the precast composite slab to connect the two precast composite slab base plates 1. A cast-in-place concrete connection section 10 is provided between the two precast composite slab base plates 1, and the cast-in-place concrete connection section 10 is located above the steel base plate 6.

[0032] Furthermore, referring to Figure 1 The two precast composite slab base plates 1 have reinforcing bars extending outwards at their adjacent ends. These reinforcing bars are fixedly connected and located inside the cast-in-place concrete connection section 10. The two precast composite slab base plates 1 are connected by the outward-extending reinforcing bars and the cast-in-place concrete connection section 10, thereby improving the structural stability of the entire connection node.

[0033] In this embodiment, the reinforcing bars extending outward from the two precast composite slab base plates 1 are connected by mechanical connection joints 5, which are located inside the cast-in-place concrete connection section 10. Mechanical connection joints 5 are Class I mechanical connection joints. Because lapped and welded connections have relatively long joint lengths and require that the percentage of connected reinforcing bar area not exceed 50%, lapped and welded connections are not recommended.

[0034] In this embodiment, refer to Figure 2 The fasteners include multiple bolts 7 welded to the steel base plate 6. Both prefabricated base plates 1 of the prefabricated composite slabs are provided with bolt holes for the bolts 7 to pass through. The spacing, number, and diameter of the bolts 7 need to be calculated and determined according to the stress conditions at the connection point and in accordance with current specifications.

[0035] Furthermore, the wet rigid connection structure of this precast composite slab base plate also includes a steel cover plate 9 located above the precast composite slab base plate 1. Bolts 7 pass through the precast composite slab base plate 1 and the steel cover plate 9 in sequence and are then tightened by nuts 8. The steel cover plate 9 and nuts 8 are located inside the monolithic cast-in-place layer 3 of the precast composite slab. The shear force of the joint is jointly borne by the steel base plate 6, the steel cover plate 9, and the monolithic cast-in-place layer 3 of the precast composite slab, thereby improving the shear resistance of the joint.

[0036] In this embodiment, grooves are provided on the top and bottom surfaces of the two prefabricated composite slab base plates 1 at their adjacent ends to accommodate the steel cover plate 9 and the steel base plate 6, respectively. The grooves facilitate the positioning of the steel cover plate 9 and the steel base plate 6, reducing installation difficulty. Both the steel cover plate 9 and the steel base plate 6 are distributed relative to the centerline of the cast-in-place concrete connection section 10.

[0037] Furthermore, the top surface of the steel base plate 6 is coated with an epoxy resin structural adhesive layer, which facilitates the bonding of the steel base plate 6 to the prefabricated composite slab base plate 1. In addition, the gaps between the steel cover plate 9 and the fasteners are filled with epoxy resin structural adhesive, thereby improving the overall structural stability.

[0038] In this embodiment, the cast-in-place concrete connection section 10 is filled with cement grout or fine aggregate concrete of a grade one grade higher than that of the precast composite slab base plate 1. The thickness of both the steel cover plate 9 and the steel base plate 6 does not exceed 10mm. The bolt hole positions of the steel base plate 6, the steel cover plate 9, and the precast composite slab base plate 1 must match each other.

[0039] The wet rigid connection structure of this prefabricated composite slab base plate is manufactured in the factory as follows:

[0040] 1. Fabricate the prefabricated base plate 1 of the prefabricated composite slab, and expose a certain length of steel bars at the end of the prefabricated base plate 1. Protect the finished product during transportation. Reserve bolt holes near the end of the prefabricated base plate 1.

[0041] 2. The steel base plate 6 and bolts 7 are welded together in the factory to form a connector.

[0042] The installation process of this prefabricated composite slab with wet rigid connection structure on the assembly site is as follows:

[0043] 1. Hoist the connector into place and apply epoxy resin structural adhesive to its upper surface.

[0044] 2. Hoist the two prefabricated composite slab base plates 1 that need to be connected into place, and use connectors to initially connect the two prefabricated composite slab base plates 1 to be connected. Specifically, insert the bolts 7 of the connectors into the reserved bolt holes of the prefabricated composite slab base plates 1 at the same time.

[0045] 3. After connecting the exposed steel bars at the ends of the two precast composite slab base plates 1 using mechanical connection joints 5, the exposed steel bars are then filled with cement grout or fine stone concrete of a grade higher than that of the precast composite slab base plates 1 to form a cast-in-place concrete connection section 10. The steel base plate 6 also serves as the formwork for the cast-in-place concrete connection section 10.

[0046] 4. Install the steel cover plate 9, insert the bolts 7 into the pre-drilled bolt holes on it, tighten the nuts 8, and seal the gap between the bolts 7 and the steel cover plate 9 by injecting epoxy resin structural adhesive under pressure, thereby completing the connection of the prefabricated base plate 1 of the prefabricated composite slab.

[0047] The prefabricated composite slab wet rigid connection structure for precast base plate proposed in this embodiment has the following advantages:

[0048] 1. The precast base plate of the existing ordinary span prefabricated composite slab is spliced ​​to increase the span of the composite slab, which can meet the large span requirements of some prefabricated buildings. Compared with the existing pure cast-in-place floor slab, it can reduce the amount of cast-in-place work and reduce the amount of on-site construction, and has the advantage of rapid on-site construction.

[0049] 2. This connection structure adopts steel plate and steel bar mechanical connection joint 5 and fasteners in an assembled connection. The shear resistance of the fasteners and the tensile resistance of the mechanical connection joint 5 are used to bear the axial tension and compression in the plane of the precast base plate 1 of the assembled composite slab, thereby improving the overall structural stability.

[0050] 3. The bending moment of this connection structure is achieved by the steel base plate 6: The steel base plate 6 is connected to the prefabricated composite slab base plate 1 by bolts 7 and epoxy resin structural adhesive, and the rigid connection of the node is achieved by utilizing the tension of the steel base plate 6. Moreover, the tensile strength of the steel plate is much greater than that of concrete, resulting in higher node strength;

[0051] 4. Bolts 7 and nuts 8 form shear keys in the floor slab to ensure that the contact surface between the precast base plate 1 of the prefabricated composite slab and the integral cast layer at the connection does not slip or fail.

[0052] 5. This connection structure utilizes high-strength steel and adopts a fully prefabricated connection concept, featuring high node strength, greenness, low carbon emissions, and high efficiency. At the same time, it does not increase transportation and hoisting costs, and is convenient to construct with a high degree of industrialization.

[0053] 6. This connection structure has the advantages of convenient material procurement, no need for special irregular processing, convenient installation, reliable stress, and low cost.

[0054] This utility model also proposes a prefabricated building.

[0055] In this preferred embodiment, a prefabricated building includes a prefabricated composite slab precast base plate wet rigid connection structure. The structure and beneficial effects of this prefabricated composite slab precast base plate wet rigid connection structure are the same as those in the above embodiments, and will not be repeated here.

[0056] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A wet-method rigid connection structure for prefabricated composite slab base plates, characterized in that, It includes two precast composite slab base plates, connectors connecting the two precast composite slab base plates, a cast-in-place concrete connection section located between the two precast composite slab base plates, and a monolithic precast composite slab layer located above the two precast composite slab base plates, wherein... The connector includes a steel base plate and multiple fasteners fixed to the top surface of the steel base plate. The steel base plate is located below the two precast composite slab base plates. The fasteners pass through the two precast composite slab base plates and their heads are located inside the integral cast-in-place layer of the precast composite slab to connect the two precast composite slab base plates. A cast-in-place concrete connection section is provided between the two precast composite slab base plates, and the cast-in-place concrete connection section is located above the steel base plate.

2. The prefabricated composite slab wet rigid connection structure as described in claim 1, characterized in that, Both precast composite slab base plates have reinforcing bars extending outwards at their ends that are close to each other. The reinforcing bars of the two precast composite slab base plates are fixedly connected and located inside the cast-in-place concrete connection section.

3. The prefabricated composite slab wet rigid connection structure as described in claim 2, characterized in that, After the reinforcing bars extending outward from the precast base plate of the two prefabricated composite slabs are connected by mechanical connection joints, the mechanical connection joints are located inside the cast-in-place concrete connection section.

4. The prefabricated composite slab wet rigid connection structure as described in claim 1, characterized in that, The fasteners include multiple bolts welded to the steel base plate, and both prefabricated base plates of the assembled composite slabs are provided with bolt holes for the bolts to pass through.

5. The prefabricated composite slab wet rigid connection structure as described in claim 1, characterized in that, It also includes a steel cover plate located above the precast base plate of the prefabricated composite slab. Bolts pass through the precast base plate and the steel cover plate in sequence and are then tightened by nuts. The steel cover plate and nuts are located inside the integral cast layer of the prefabricated composite slab.

6. The prefabricated composite slab precast base plate wet rigid connection structure as described in claim 5, characterized in that, The top and bottom surfaces of the two prefabricated composite slab base plates, which are close to each other, are provided with grooves to accommodate the steel cover plate and the steel base plate, respectively.

7. The prefabricated composite slab wet rigid connection structure as described in claim 5, characterized in that, The top surface of the steel base plate is coated with an epoxy resin structural adhesive layer; the gap between the steel cover plate and the fasteners is filled with epoxy resin structural adhesive.

8. The prefabricated composite slab precast base plate wet rigid connection structure as described in any one of claims 1 to 7, characterized in that, The cast-in-place concrete connection section is densely filled with cement grout or fine aggregate concrete of a grade one grade higher than that of the precast base plate of the prefabricated composite slab.

9. The prefabricated composite slab wet rigid connection structure as described in claim 5, characterized in that, The thickness of both the steel cover plate and the steel base plate does not exceed 10 mm.

10. A prefabricated building, characterized in that, Includes the wet rigid connection structure of the prefabricated base plate of the assembled composite slab as described in any one of claims 1 to 9.

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