Composite structure of prefabricated secondary beam and composite floor slab
By setting shear-resistant steel bars on the precast secondary beams and positioning perforations on the composite floor slab, a reliable shear-resistant integral connection between the precast secondary beams and the composite floor slab is achieved, solving the problems of low efficiency and material waste in the existing technology, and improving construction efficiency and material utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2026-03-20
AI Technical Summary
In existing secondary beam and concrete floor slab composite structures, the exposed stirrups at the top of the precast concrete secondary beams prevent the floor slab from crossing them, affecting factory production and on-site installation efficiency. Furthermore, without exposed stirrups at the top, the floor slab and secondary beams cannot form a reliable shear connection, increasing material costs.
The composite structure of precast secondary beams and composite floor slabs is adopted. Shear reinforcement is set on the precast secondary beams, and positioning holes are set at corresponding positions in the composite bottom slab. The shear reinforcement passes through the positioning holes and extends into the cast-in-place floor slab to form an integral structure and realize a T-shaped connection section.
It improves the processing and installation efficiency of composite base plates, increases spanning capacity, reduces the height of precast secondary beams and the amount of steel reinforcement, and forms a reliable shear-resistant integral connection.
Smart Images
Figure CN224016597U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of fabricated building, especially relate to a kind of combination structure of prefabricated secondary beam and composite floor. BACKGROUND
[0002] For the combination structure of existing secondary beam+concrete floor, there are generally two methods:
[0003] I. Since prefabricated concrete secondary beam needs to expose stirrup at top, it leads to that floor cannot span secondary beam, floor is divided into shorter length, which is not conducive to the efficiency improvement of factory production and on-site installation;
[0004] II. For secondary beam without top exposed stirrup, when floor uses continuous plate spanning secondary beam, since floor and secondary beam cannot form reliable shear connection, secondary beam cannot form T-shaped cross-section composite beam with floor, which is higher in cost and is not conducive to material saving.
[0005] Therefore, the present application comes into being. INVENTION CONTENTS
[0006] The utility model aims at providing a kind of combination structure of composite floor spanning secondary beam as a whole and forming reliable shear whole with secondary beam.
[0007] To achieve this object, the utility model provides a kind of combination structure of prefabricated secondary beam and composite floor, characterized by comprising:
[0008] Prefabricated secondary beam, the prefabricated secondary beam includes prefabricated part and composite part, the composite part is located on the prefabricated part, the prefabricated part is provided with shear reinforcement, the shear reinforcement has at least one main body section, and the main body section is arranged along the first direction;
[0009] Composite bottom plate, the composite bottom plate is laid on the prefabricated part of the prefabricated secondary beam, and is at least continuous structure at the composite part, the composite bottom plate position is provided with positioning perforation along the second direction at the shear reinforcement, and at least the main body section of the shear reinforcement is arranged in the positioning perforation and extends above the composite bottom plate;
[0010] Floor cast-in-place layer, the floor cast-in-place layer is formed on the composite bottom plate, and the main body section is bolted in the floor cast-in-place layer and forms integral structure with the prefabricated secondary beam, the composite bottom plate and the floor cast-in-place layer.
[0011] Preferably, the shear reinforcement is implemented as the stirrup of the prefabricated secondary beam;The top part of the stirrup of the prefabricated secondary beam extends in the composite part;The main body section is implemented as the top horizontal section of the stirrup.
[0012] Preferably, the shear steel bar is implemented as a U-shaped steel bar, which includes at least two vertical steel bars and a horizontal steel bar, the vertical steel bars are embedded in the prefabricated part of the prefabricated secondary beam, and the horizontal steel bar is arranged in the positioning hole and located in the cast-in-place layer of the floor.
[0013] Preferably, the positioning hole is a long hole, and a second direction in which the long hole is arranged is the same as a first direction of the main body.
[0014] Preferably, a hole width of the long hole is not more than 100 mm.
[0015] Preferably, the composite floor includes a prefabricated floor and a concrete rib, and the concrete rib is formed on the prefabricated floor.
[0016] Preferably, the shear steel bar is implemented as a hoisting part of the prefabricated secondary beam.
[0017] Preferably, the positioning hole is a long hole, and a second direction in which the long hole is arranged is the same as a first direction of the main body.
[0018] Preferably, a hole width of the long hole is not more than 100 mm.
[0019] The technical effects of the above technical scheme of the utility model are achieved by one or more of the following combinations:
[0020] The utility model discloses a composite floor is used as the whole board to cross the prefabricated secondary beam and is laid, and does not need to be discontinuous like traditional mode and is laid in the two sides of the prefabricated secondary beam, but is bolted with the shear steel bar on the top of the prefabricated secondary beam, and also can form the T-shaped connection section, so that the prefabricated secondary beam, the composite floor and the cast-in-place layer of the floor of the composite floor form a shear whole, and installation is more convenient.
[0021] The composite floor can be made into a longer board, and the processing and installation efficiency of the composite floor is improved.
[0022] The composite floor can be a continuous board in the construction stage, and the spanning capacity of the composite floor is increased.
[0023] The prefabricated secondary beam can form a whole with the composite floor, and the height of the prefabricated secondary beam and the amount of steel are effectively reduced. ACCURACY OF DRAWINGS
[0024] Figure 1 The structure diagram of the utility model is expressed.
[0025] Figure 2 The structure diagram of the prefabricated secondary beam and the composite floor in the utility model is expressed.
[0026] Figure 3 The structure diagram of the prefabricated part of the prefabricated secondary beam in the utility model is expressed.
[0027] Figure 4 The reinforcement layout of the prefabricated secondary beam in the utility model is expressed.
[0028] Figure 5 The top view of the utility model is expressed.
[0029] Figure 6 The front view of the utility model is expressed.
[0030] 1, prefabricated secondary beam; 11, prefabricated part; 111, longitudinal reinforcement; 112, stirrup; 12, shear reinforcement; 121, main body section; 2, composite bottom plate; 20, positioning perforation; 21, prefabricated bottom plate; 22, concrete rib; 3, floor cast-in-place layer. DETAILED DESCRIPTION
[0031] The following description is presented to enable any person skilled in the art to practice and use the utility and to incorporate it into specific applications. Various modifications, and applications in different environments will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to a wide range of embodiments. Thus, the utility is not to be limited to the embodiments presented, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
[0032] In the following detailed description, numerous specific details are set forth in order to provide a more thorough understanding of the utility. However, it will be apparent to one skilled in the art that the utility can be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring the utility.
[0033] The reader's attention is directed to all papers and documents which are filed concurrently with this specification and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference. All the features disclosed in this specification, (including any accompanying claims, abstract and drawings) can be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed in this specification is one example only of a generic series of equivalent or similar features.
[0034] It is noted that, where used, the terms left, right, front, back, top, bottom, normal, reverse, clockwise, and counterclockwise are used for convenience only and do not imply any particular fixed direction. Indeed, they are used to reflect the relative position and / or orientation between various parts of the object. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
[0035] In the description of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0036] It is noted that, where used, further, preferably, further and more preferably are simple beginnings of another embodiment based on the foregoing embodiment, and the contents after the further, preferably, further or more preferably are combined with the foregoing embodiment as the complete structure of another embodiment. The further, preferably, further or more preferably after the same embodiment can be arbitrarily combined to constitute another embodiment.
[0037] The present application will be described in detail below in conjunction with the drawings and specific embodiments. It is noted that the aspects described below in conjunction with the drawings and specific embodiments are only exemplary and should not be understood as limiting the scope of protection of the present application.
[0038] Please refer to Figures 1-6 The embodiment provides a prefabricated secondary beam and composite floor combined structure, which comprises a prefabricated secondary beam 1, a composite bottom plate 2 and a floor cast-in-place layer 3. Wherein, the prefabricated secondary beam 1 comprises a prefabricated part 11 and a composite part (not shown), the composite part is located on the prefabricated part 11, the prefabricated part 11 is provided with a shear steel bar 12, the shear steel bar 12 has at least one main body segment 121, and the main body segment 121 is arranged along a first direction; the composite bottom plate 2 is laid on the prefabricated part 11 of the prefabricated secondary beam 1, and is at least a continuous structure (region A) at the composite part, the composite bottom plate 2 is provided with a positioning perforation 20 arranged along a second direction at a position corresponding to the shear steel bar 12, at least the main body segment 121 of the shear steel bar 12 is arranged in the positioning perforation 20 and extends above the composite bottom plate 2; the floor cast-in-place layer 3 is cast and formed on the composite bottom plate 2, the main body segment 121 is bolted in the floor cast-in-place layer 3 and forms an integral structure of the prefabricated secondary beam 1, the composite bottom plate 2 and the floor cast-in-place layer 3. Figure 5
[0039] In this embodiment, "continuous structure" is interpreted as follows: Figure 5 The area shown is region A. When the composite base slab 2 crosses the precast secondary beam 1, it is a whole slab structure, that is, the composite base slab 2 crosses the precast secondary beam 1 as a whole slab structure, which is not the discontinuous structure or spliced structure of the existing technology where the composite base slab 2 is placed on the side of the precast secondary beam 1.
[0040] In a preferred embodiment of this invention, the precast portion 11 of the precast secondary beam 1 is a concrete segment precast in a factory, encasing a reinforcing cage. This reinforcing cage includes longitudinal bars 111 and stirrups 112, which is prior art and will not be explained further. Furthermore, the shear reinforcement 12 is integrally formed with the precast portion 11 during the factory prefabrication stage.
[0041] Specifically, the shear reinforcement 12 can be implemented as the stirrup 112 of the precast secondary beam 1; the top part of the stirrup 112 of the precast secondary beam 1 extends into the overlapping part; the main body section 121 is implemented as the top horizontal section of the stirrup 112.
[0042] Or, such as Figure 4 As shown, the shear reinforcement 12 is implemented as an additional U-shaped reinforcement, which includes at least two vertical bars and one horizontal bar. The vertical bars are embedded in the precast portion 11 of the precast secondary beam 1, and the horizontal bar passes through the positioning holes 20 and is located in the cast-in-place floor slab 3. The main body section 121 is implemented as a horizontal bar. The U-shaped reinforcement is implemented as the basic structure of this embodiment, in which one horizontal bar is connected to the top of the two vertical bars to form a U-shape. Furthermore, a horizontal bar can also be connected to the bottom of the two vertical bars to form a stirrup structure based on the U-shaped reinforcement.
[0043] As a preferred embodiment of this embodiment, the positioning perforation 20 in this embodiment is an elongated hole, and the second direction in which the elongated hole is defined is the same as the first direction of the main body segment 121.
[0044] As mentioned above, regardless of whether the main section 121 of the shear reinforcement 12 is implemented as the top horizontal section of the stirrup 112 or the transverse reinforcement of the U-shaped bar, its first direction is the same as the direction of the elongated hole, which facilitates the installation and positioning of the composite base plate 2. Specifically, the first direction is perpendicular to the beam length direction of the precast secondary beam 1, and the second direction is also perpendicular to the beam length direction of the precast secondary beam 1.
[0045] In this embodiment, in order to achieve effective connection between the precast secondary beam, the composite base slab 2 and the cast-in-place floor layer 3 of the composite base slab 2, the number of positioning holes 20 is multiple, and they are set at intervals along the beam length direction. The distance between adjacent positioning holes 20 is 100~600mm, preferably 300mm; the width of the elongated holes does not exceed 100mm.
[0046] Please combine Figure 6, the floor cast-in-place layer 3 is poured and formed on the composite floor slab 2, and enters the composite part of the prefabricated secondary beam 1 through the positioning perforation 20, so as to be engaged and connected by the shear steel bar 12, so that each positioning perforation 20 forms a T-shaped connection to form an integral structure, wherein the T-shaped connection is explained as pouring grouting material on the composite floor slab to form the floor cast-in-place layer 3 and the part of the positioning perforation and the shear steel bar 12 engaged.
[0047] It should be noted that the embodiment does not make any limitation on the structure of the composite floor slab 2, which can adopt a steel bar truss type composite floor slab 2, or the preferred concrete rib composite slab in the embodiment. Specifically, please refer to Figure 2 The composite floor slab 2 comprises a prefabricated floor slab 21 and a concrete rib 22, and the concrete rib 22 is formed on the prefabricated floor slab 21, and the position of the positioning perforation 20 is avoided from the concrete rib 22 after the structure of the concrete rib 22 is formed.
[0048] The shear steel bar 12 and the prefabricated part 11 of the prefabricated secondary beam are integrally formed in the factory, and the structural integrity of the shear steel bar 12 enables the shear steel bar 12 to be implemented as a hoisting piece of the prefabricated secondary beam 1. Further, in order to improve the engagement capacity of the shear steel bar 12 in the floor cast-in-place layer 3, the main section 121 of the shear steel bar 12 is preferably implemented to be not less than 70mm beyond the height of the prefabricated part 11.
[0049] The beneficial effects of the technical solution are as follows:
[0050] The utility model discloses a composite floor slab 2 as a whole plate across the prefabricated secondary beam and does not need to be discontinuously laid on the two sides of the prefabricated secondary beam as in the traditional way, but is bolted with the shear steel bar 12 on the top of the prefabricated secondary beam through the hole in the composite floor slab 2, and also can form a T-shaped connection section, so that the prefabricated secondary beam, the composite floor slab 2 and the floor cast-in-place layer 3 of the composite floor slab 2 form a shear integral body, and the installation is more convenient.
[0051] The composite floor slab 2 can be made into a longer plate, and the processing and installation efficiency of the composite floor slab 2 is improved.
[0052] The composite floor slab 2 can become a continuous plate in the construction stage, and the spanning capacity of the composite floor slab 2 is increased.
[0053] The prefabricated secondary beam 1 can form an integral body with the composite floor slab 2, and the height of the prefabricated secondary beam 1 and the amount of steel bars are effectively reduced.
[0054] Further, the utility model is described in detail in combination with the embodiment of the drawings, and various change examples of the utility model can be made by the ordinary skilled in the art according to the above description. Therefore, some details in the embodiment should not constitute the limitation on the utility model, and the protection scope of the utility model will be defined as the range of the appended claims.
Claims
1. A combined structure of precast secondary beams and composite floor slabs, characterized in that, include: A precast secondary beam, comprising a precast portion and a composite portion, wherein the composite portion is located on the precast portion, and shear reinforcement is provided on the precast portion, wherein the shear reinforcement has at least one main segment, and the main segment is arranged along a first direction; A composite base plate is laid on the precast portion of the precast secondary beam and is a continuous structure at least at the composite portion. The composite base plate is provided with positioning holes arranged in a second direction at the position corresponding to the shear reinforcement. At least the main body section of the shear reinforcement passes through the positioning holes and extends above the composite base plate. The cast-in-place floor slab is cast on the composite base slab, and the main body section is bolted to the cast-in-place floor slab, forming an integral structure with the precast secondary beam, the composite base slab, and the cast-in-place floor slab.
2. The combined structure as described in claim 1, characterized in that: The shear reinforcement is implemented as the stirrups of the precast secondary beam; the top portion of the stirrups of the precast secondary beam extends into the overlapping portion; the main body segment is implemented as the top horizontal segment of the stirrups.
3. The combined structure as described in claim 1, characterized in that: The shear reinforcement is implemented as U-shaped bars, which include at least two vertical bars and one horizontal bar. The vertical bars are embedded in the precast portion of the precast secondary beam, and the horizontal bar passes through the positioning holes and is located in the cast-in-place floor slab. The main body section is implemented as the horizontal bar.
4. The combined structure as described in claim 1, characterized in that: The positioning perforation is an elongated hole, and the second direction of the elongated hole is defined to be the same as the first direction of the main body segment.
5. The combined structure as described in claim 4, characterized in that: The width of the elongated hole shall not exceed 100mm.
6. The combined structure as described in claim 1, characterized in that: The composite base plate includes a precast base plate and concrete ribs, with the concrete ribs formed on the precast base plate.
7. The combined structure as described in claim 1, characterized in that: The shear reinforcement is implemented as a lifting component of the precast secondary beam.
8. The combined structure as described in claim 1, characterized in that: The number of positioning perforations is multiple, and the distance between adjacent positioning perforations is 100~600mm.
9. The combined structure as described in claim 1, characterized in that: The main section of the shear-resistant steel bar extends at least 70 mm beyond the height of the precast portion.