Fabricated floor frame and fabricated trussed floor

Abstract

The application provides a fabricated floor frame and a fabricated truss floor, wherein the fabricated floor frame comprises a top chord and a plurality of hollow web members; adjacent top portions of the hollow web members are connected to form flat connections, and the connections are fixedly connected to the top chord; and adjacent bottom portions of the hollow web members are connected to form flat fixed portions, and the flat fixed portions are fixed to a bottom chord structure.

Description

Technical Field

[0001] This invention relates to the field of building materials and structures, and particularly to a frame for prefabricated floor slabs and a prefabricated truss floor slab. Background Technology

[0002] A truss is a building component consisting of a top chord, a bottom chord, and web members. It is commonly used as a structural element in buildings, such as in floor slabs and large-span structures. When applied to floor slabs, the bottom chord is replaced with a concrete base slab (precast layer), forming a structure of top chord, web members, and a concrete base slab. The web members are welded to the top chord, and their bottoms are embedded in the concrete base slab. In current applications, web members are typically steel reinforcement. In thick hollow structures, due to slenderness ratio limitations, thicker steel reinforcement is required for the web members, resulting in higher costs. Furthermore, in concrete base slabs, the large diameter of the steel reinforcement necessitates a thicker base slab to meet the requirements for the concrete cover, preventing ultra-thin slab construction. Even in thinner floor slab structures, when the web member diameter is large, if the web members are not flattened at the connection between the web member and the top chord, the limited height between the top chord and the concrete layer makes it difficult to run conduits through the cast-in-place layer, and the reliability of the connection between the web member and the top chord is also affected. Another challenge is the limited out-of-plane stiffness of the reinforcing bar web members. This necessitates a spatial three-dimensional triangular truss, requiring two sets of angled web members, further increasing the amount of steel used in the floor slab truss. Since the web members contribute almost no stress after the slab is formed, this is quite wasteful. However, using steel pipes can achieve greater out-of-plane stiffness with the same amount of material, allowing for the use of a single row of diagonal web members. Therefore, this invention was developed to address this issue. Summary of the Invention

[0003] One objective of this invention is to provide a truss structure or a prefabricated composite floor slab with the truss, which solves the problems of excessive cost due to excessively thick steel bars and the fit between the web members and the top chord.

[0004] Another objective of this invention is to provide a truss structure or a building structure with the truss to solve the problem of excessively thick web members embedded in the base slab and to reduce the weight of the precast concrete layer.

[0005] Another objective of this invention is to provide a truss structure with a single web member or a prefabricated composite floor slab with such a truss, thereby solving the problem of excessive steel consumption in triangular trusses.

[0006] Another objective of this invention is to provide a truss structure or a building structure with the truss, which solves the problem that traditional truss compression web members often have to use thicker steel bars because the slenderness ratio of the steel bars is insufficient, thus needlessly increasing the amount of steel used in the steel truss web members.

[0007] Another objective of this invention is to provide a single truss structure with a concrete rib on the upper chord or a precast composite slab with such a structure, to solve the problem of insufficient stiffness of the floor slab with a precast reinforced steel upper chord.

[0008] To address one of the aforementioned objectives, the present invention first provides a frame for prefabricated floor slabs, characterized in that it comprises: an upper chord and a plurality of hollow web members; a flat connection is formed between the tops of adjacent hollow web members, the connection being fixedly connected to the upper chord; and a flat fixing point is formed between the bottoms of adjacent hollow web members, the flat fixing point being fixed to the lower chord structure.

[0009] Preferably, the plurality of hollow web members are wavy, the flat connection is implemented at the crest of the wavy hollow web member, and the flat fixing is implemented at the trough of the wavy hollow web member.

[0010] Preferably, the wavy hollow web bar is formed by continuously bending a single bar.

[0011] Preferably, the flat connector has a connecting surface, which is either a plane or a concave surface whose shape adapts to the outer contour of the upper chord.

[0012] Preferably, the upper chord is implemented as a concrete rib upper chord, and the flat connector is fixedly connected to the concrete rib upper chord.

[0013] Preferably, transverse steel bars are provided at the trough bends (i.e., flat fixing points) of the wavy hollow web member.

[0014] Preferably, a reinforcing bar groove is provided at the bottom or top of the upper chord of the concrete rib along the direction perpendicular to the rib length.

[0015] Preferably, a first structural reinforcement is provided inside the upper chord of the concrete rib along the rib length direction, and the first structural reinforcement is connected to or in contact with the flat joint.

[0016] To achieve one of the above objectives, the present invention also provides a prefabricated truss floor slab, characterized in that it comprises: the above-mentioned prefabricated floor slab frame and a base plate, wherein the flat fixing portion of the prefabricated floor slab frame is fixed to the base plate, and a cast-in-place layer is poured on the base plate, wherein the cast-in-place layer fills the prefabricated floor slab frame.

[0017] Preferably, the plurality of hollow web members are connected in a wavy shape, with the crests of the wavy hollow web members being implemented as flat joints, which are connected to the upper chord; the troughs of the wavy hollow web members are implemented as flat fixing points, which are fixed to the base plate.

[0018] Preferably, the base plate is provided with a second structural rib and a third structural rib, which are arranged in a crisscross pattern.

[0019] Preferably, the cross-sections of the upper chord and the hollow web member are circular, elliptical, rectangular, or square.

[0020] The technical effects of the above-mentioned technical solutions of the present invention arise from one or more of the following combinations:

[0021] Because the web members are made of hollow steel pipes, the out-of-plane stiffness of the hollow web members is significantly increased compared to the steel reinforcement, so a planar truss can be used for the hollow web members. Compared with the traditional triangular web member truss, this can greatly save on truss processing costs and truss web member material costs.

[0022] The hollow tubing of the web members is flattened at the crests and troughs. The advantage of flattening is that the thickness of the flattened steel tube is only 1-2 mm, which facilitates connection to the top chord and reduces the thickness of the concrete layer when embedded in it, thus reducing the weight of the precast layer or increasing the effective mechanical height of the truss. Flattening at the troughs helps to increase the interlocking area between the hollow web members and the concrete base slab.

[0023] The top of the hollow web members is flattened to form a flat structure, which can avoid the problem of the intersection of the web members and the upper chord being eccentric in conventional steel truss, and reduce secondary bending moments; the steel pipe section is thicker, which is beneficial to increase the shear resistance of the frame and concrete.

[0024] Since the web members are made of a single truss, the upper chord is prone to out-of-plane instability. Using non-equilateral cross-section steel tubes for the upper chord can significantly increase the out-of-plane stiffness. Furthermore, under the same cross-sectional area, it is beneficial for the neutral axis of the upper chord to rise, increasing the equivalent radius of inertia of the entire truss and improving its bending resistance.

[0025] When a concrete rib is used for the top chord, compared to using steel bars or steel pipes for the top chord, the bending stiffness of the precast composite truss is greatly increased, and the bottom support-free span during floor slab pouring is increased.

[0026] The groove for the upper chord reinforcement of the concrete rib is used to lay the upper layer of reinforcement perpendicular to the rib direction, which can increase the cross-sectional height of the reinforcement and increase the section modulus.

[0027] The reinforcing bars are placed in the trench and are positioned relative to the bottom of the upper chord of the concrete rib. The reinforcing bars are closer to the upper surface, resulting in better mechanical properties and also helping to prevent cracking of the upper layer of the cast-in-place concrete. Attached Figure Description

[0028] Figure 1 This diagram shows the front structural view of the prefabricated floor slab frame of the present invention.

[0029] Figure 2 The diagram shows a side view of a structure for a prefabricated floor slab frame according to the present invention.

[0030] Figure 3The side view shows another structure of the prefabricated floor slab frame of the present invention.

[0031] Figure 4 This diagram shows the front structural view of the prefabricated truss floor slab of the present invention.

[0032] Figure 5 The image shows a side view of one structure of the prefabricated truss floor slab of the present invention.

[0033] Figure 6 The side view shows another structure of the prefabricated truss floor slab of the present invention.

[0034] Figure 7 This diagram shows the front view of the prefabricated floor slab frame of the present invention when the upper chord is a concrete rib upper chord.

[0035] Figure 8 This is a side view of the prefabricated floor slab frame of the present invention when the upper chord is a concrete rib upper chord.

[0036] Figure 9 This diagram shows the front view of the prefabricated truss floor slab of the present invention when the upper chord is a concrete rib upper chord.

[0037] Figure 10 This diagram illustrates the side structure of the prefabricated truss floor slab of the present invention when the upper chord is a concrete rib upper chord. Detailed Implementation

[0038] The following description is provided to enable those skilled in the art to implement and use the invention and incorporate it into specific application contexts. Various modifications and uses in different applications will be readily apparent to those skilled in the art, and the general principles defined herein are applicable to a wide range of embodiments. Therefore, the invention is not limited to the embodiments given herein, but should be granted the broadest scope consistent with the principles and novel features disclosed herein.

[0039] In the following detailed description, numerous specific details are set forth to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that practice of the invention is not necessarily limited to these specific details. In other words, well-known structures and devices are shown in block diagram form without being depicted in detail to avoid obscuring the invention.

[0040] Readers should note all documents and references submitted concurrently with this specification and open to public inspection, the contents of which are incorporated herein by reference. Unless otherwise expressly stated, all features disclosed in this specification (including any appended claims, abstracts, and drawings) may be replaced by alternative features for the same, equivalent, or similar purposes. Therefore, unless explicitly stated otherwise, each disclosed feature is merely one example of a set of equivalent or similar features.

[0041] Note that, where used, the markings left, right, front, back, top, bottom, front, back, clockwise, and counterclockwise are merely for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative position and / or orientation between different parts of an object. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] Note that, in practice, "further," "preferably," "even further," and "more preferably" are simply starting points for describing another embodiment based on the foregoing embodiments. The combination of the content following "further," "preferably," "even further," or "more preferably" with the foregoing embodiments constitutes the complete configuration of another embodiment. Any combination of several "further," "preferably," "even further," or "more preferably" settings following the same embodiment can form yet another embodiment.

[0044] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0045] Example 1:

[0046] Please refer to Figure 1 , Figure 2 , Figure 3 Combination Figure 7 and Figure 8This embodiment describes a prefabricated floor slab frame, which consists of at least an upper chord 1 and a plurality of hollow web members 2. The tops of adjacent hollow web members 2 are connected to form a flat connection 21, which is fixedly connected to the upper chord 1. The bottoms of adjacent hollow web members 2 are connected to form a flat fixing point 22, which is fixed to the lower chord structure.

[0047] The lower chord structure can be implemented as a concrete slab or other concrete foundation structure, and the specific application of this prefabricated floor slab frame in practice should be referred to.

[0048] The flat fixing part 22 is fixed to the lower chord structure. There are two implementation methods: the flat fixing part 22 can be embedded in the lower chord structure or fixed to the surface of the lower chord structure. The two implementation methods are described in detail later.

[0049] Figure 1 In this structure, multiple hollow web members 2 are wavy, with flat joints 21 applied to the crests of the wavy hollow web members 2, and flat fixing points 22 applied to the troughs of the wavy hollow web members 2. The hollow web members 2 can be continuously combined from W-shaped or V-shaped members to form the wavy shape. In actual construction, the wavy hollow web members 2 are formed by continuously bending a single member. The troughs of the wavy hollow web members 2 are flattened, and after the crests of the wavy hollow web members 2 are flattened, the side facing the upper chord 1 can be either flat or concave. The following description, in conjunction with the structure of the upper chord 1, will provide a detailed explanation.

[0050] For details, please refer to Figure 4 The flat joint 21 at the crest and the flat fixing joint 22 at the trough are obtained by pressing or hammering the bent parts of the corrugated hollow web member 2. Therefore, hollow steel pipes are used for the hollow web member 2. When the flat fixing joint 22 is embedded in the base plate 4, transverse steel bars 221 are provided on the flat fixing joint 22 to provide the embedding strength of the flat fixing joint 22 in the base plate 4, which helps to prevent the flat fixing joint 22 from being pulled out of the base plate 4. Furthermore, the transverse steel bars 221 can also act as shear studs. This transverse steel bar is only shown in the attached drawings to avoid affecting the overall drawing representation. Figure 4 The figure is shown in the figure, but those skilled in the art should be able to determine its position in other figures based on the position of the flat fixing part 22 and the above description.

[0051] When hollow steel pipes are used for both the hollow web member 2 and the upper chord 1, their cross-sections can be circular, elliptical, rectangular, or square. The upper chord 1 is filled with concrete to enhance its strength and reduce the amount of steel used.

[0052] Please compare and refer to the following: Figure 5 and Figure 6The flat joint 21 of the wavy hollow web member 2 has a connecting surface for fitting with the upper chord 1. When the upper chord 1 is a square tube, the bottom surface of the upper chord 1 is also a plane. The bottom surface of the upper chord 1 is fitted with the connecting surface of the flat joint 21 and then welded. When the outer diameter of the upper chord 1 is not a plane, the connecting surface is a connecting concave surface whose shape is adapted to the outer diameter of the upper chord.

[0053] When the top chord 1 is used as the top chord member, it is welded to the hollow web member 2; when the top chord is implemented as... Figure 8 and Figure 9 When the upper chord of the concrete rib is installed, the flat connector 21 is embedded or fixed to the upper chord of the concrete rib to complete the fixed connection between the two. Preferably, when the flat connector 21 is fixed to the upper chord concrete rib, the flat connector 21 is fixed to the bottom surface of the upper chord concrete rib.

[0054] For a better option, please refer to Figure 7 A reinforcing bar groove 31 is provided at the bottom of the upper chord of the concrete rib along the direction perpendicular to the rib length, and a fourth structural reinforcement bar 33 is provided in the reinforcing bar groove 31. Combined with... Figure 8 and Figure 9 It can be seen that, Figure 8 It's a frontal view. Figure 9 This is a side view. A first structural reinforcement bar 32 is also provided along the length of the rib within the upper chord of the concrete rib. The first structural reinforcement bar 32 is connected to or contacts the flat joint 21. (Combined) Figure 8 and Figure 9 It can be concluded that the fourth structural reinforcement 33 and the first structural reinforcement 32 are arranged in layers in terms of spatial height, and are arranged in multiple longitudinal and transverse directions in terms of breadth. The reinforcement groove 31 of the upper chord of the concrete rib is used to lay the upper layer of reinforcement perpendicular to the rib direction (i.e., the fourth structural reinforcement 33), which can increase the cross-sectional height of the reinforcement and increase the section modulus; at the same time, the reinforcement in the reinforcement groove 31 is closer to the upper surface, which is also conducive to preventing cracking of the upper layer of the cast-in-place concrete after the subsequent floor slab is poured.

[0055] Furthermore, the reinforcing bar groove 31 in the figure is located at the bottom of the upper chord of the concrete rib, or it can be opened at the top of the upper chord of the concrete rib. However, when it is opened at the top, the subsequent floor slab pouring must completely cover the reinforcing bar groove 31 and the fourth structural reinforcement 33.

[0056] In all the embodiments described above, the flat connection 21 and flat fixing point 22 of the hollow web member are made by hammering hollow tubes flat, and the upper chord 1 is made of hollow tube or concrete rib. When the upper chord 1 is made of hollow tube, a grouting space can be reserved inside to fill concrete or grout to enhance the strength and rigidity of the structure.

[0057] Example 2:

[0058] Please refer to Figure 4 , Figure 5 and Figure 6 and combined Figures 1-3 and Figures 9-10 This embodiment describes a prefabricated truss floor slab, including the prefabricated floor slab frame and base plate 4 described in Embodiment 1. The hollow web members 2 of the prefabricated floor slab frame are embedded and fixed in the base plate 4. A cast-in-place layer is poured on the base plate 4, and the cast-in-place layer fills the prefabricated floor slab frame. It should be noted that, in order to prevent the drawings from being unclear, the cast-in-place layer is not shown. However, as a person skilled in the construction field, one can know that the cast-in-place layer is poured on site after the prefabricated floor slab frame and base plate 4 are installed to form a composite floor slab or a non-removable floor slab. The base plate 4 can be a concrete base plate 4 or other high-performance concrete base plate 4, cement fiberboard, etc.

[0059] The prefabricated floor slabs are constructed using prefabricated frames and base plates in the factory, allowing for on-site assembly construction.

[0060] Furthermore, connecting bars 5 are provided between adjacent prefabricated floor slab frames. These connecting bars 5 are located on the bottom plate 4. After the adjacent prefabricated floor slab frames are assembled together, and the cast-in-place layer fills all the prefabricated floor slab frames, the adjacent prefabricated floor slab frames are connected and integrated through the connecting bars 5.

[0061] Similarly, in the prefabricated floor slab frame, multiple hollow web members 2 are connected in a wave-like shape. The crests of the wave-like hollow web members 2 are implemented as flat connection points 21, which are flat and connected to the upper chord 1. The troughs of the wave-like hollow web members 2 are implemented as flat fixing points 22, which are flat and embedded or fixed to the base plate 4.

[0062] Similarly, multiple hollow web members 2 are wavy, with flat joints 21 applied at the crests of the wavy hollow web members 2. The hollow web members 2 can be formed by continuous combination of W-shaped or V-shaped members to create the wavy shape. In actual construction, the wavy hollow web members 2 are formed by continuous bending of a single member. The troughs of the wavy hollow web members 2 are flattened.

[0063] The troughs of the wavy hollow web member 2 are used to connect with the concrete structure. The bends at the troughs of the wavy hollow web member 2 are set as flat fixing points 22, which are embedded in the concrete structure.

[0064] Specifically, the flat connecting part 21 at the crest and the flat fixing part 22 at the trough are obtained by pressing or hammering the bent parts of the corrugated hollow web member 2. Therefore, hollow steel pipes are selected for the hollow web member 2.

[0065] The bottom slab is equipped with a second structural reinforcement 41 and a third structural reinforcement 42 to strengthen the bottom structure, prevent excessive deformation or cracking of the bottom slab during hoisting and on-site concrete pouring, and replace some or all of the bottom reinforcing steel bars under normal use of the floor slab, thereby reducing steel consumption and saving costs. The optimal implementation method is to arrange the second structural reinforcement 41 and the third structural reinforcement 42 in a crisscross mesh.

[0066] Hollow web members 2 and upper chord 1 are both made of hollow steel pipes with circular, elliptical, rectangular or square cross-sections. When upper chord 1 is made of hollow steel pipe, concrete or mortar can be poured inside.

[0067] The flat joint 21 of the wavy hollow web member 2 has a connecting surface for fitting with the upper chord 1. When the upper chord 1 is a square tube, its bottom surface is also flat. The bottom surface of the upper chord 1 is fitted with the connecting surface of the flat joint 21 and then welded. When the upper chord 1 is a circular tube, the connecting surface is concave. Welding is performed at the bottom of the circular tube to form a welding point 211, or resistance welding is used to directly form a welding point at the contact point.

[0068] The trough of the wavy hollow web member 2 is a flat fixing point 22, which is also formed by pressing or hammering the bent part of the hollow web member 2. On the one hand, because the flat fixing point 22 is thinner in space, more of the straight part of the hollow web member 2 can be deeply embedded in the base plate 4, which strengthens the overall connection strength. On the other hand, the structure of the flat fixing point 22 is flatter than the traditional bent part, so the protective layer thickness required in the base plate 4 is thinner, and the overall thickness of the base plate 4 can be made thinner, achieving lightweight and thinner design; and more economical.

[0069] The above two embodiments can achieve the following beneficial effects based on their individual performance:

[0070] Because hollow web members are made of hollow steel pipes, their out-of-plane stiffness relative to the reinforcing steel is greatly increased. Therefore, planar trusses can be used for hollow web members, which can significantly reduce truss processing costs and truss web member material costs compared to traditional triangular web member trusses.

[0071] The hollow tubing of the web members is flattened at the crests and troughs. The advantage of flattening is that the thickness of the flattened steel tube is only 1-2mm, which facilitates connection to the top chord and saves on concrete thickness when embedded in concrete, reducing the weight of the precast layer or increasing the effective mechanical height of the truss. Flattening at the troughs helps to increase the interlocking area between the hollow web members and the concrete base slab.

[0072] The top of the hollow web members is flattened to form a flat structure, which can avoid the problem of the intersection of the web members and the upper chord being eccentric in conventional steel truss, and reduce secondary bending moments; the steel pipe section is thicker, which is beneficial to increase the shear resistance of the frame and concrete.

[0073] The upper chord uses a non-equilateral section steel tube. Due to the use of a non-triangular truss, the upper chord is prone to out-of-plane instability. Using a non-equilateral section steel tube for the upper chord can significantly increase the out-of-plane stiffness. Furthermore, under the same cross-sectional area, it is beneficial for the neutral axis of the upper chord to rise, increasing the equivalent radius of inertia of the entire truss and improving the bending resistance.

[0074] When the upper chord is made of concrete ribs, compared with the upper chord made of steel bars or steel pipes, the bending stiffness of the prefabricated floor slab frame is greatly increased, and the bottom support-free span is increased when the floor slab is poured.

[0075] The groove for the upper chord reinforcement of the concrete rib is used to lay the upper layer of reinforcement perpendicular to the rib direction, which can increase the cross-sectional height of the reinforcement and increase the section modulus.

[0076] The steel bars in the steel bar groove are closer to the upper surface, which also helps to prevent cracking of the upper layer of the cast-in-place concrete.

[0077] Furthermore, the present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A frame for prefabricated floor slabs, characterized in that, include: Top chord and multiple hollow webs; A flat connection is formed between the tops of adjacent hollow web members, and the flat connection is fixedly connected to the upper chord; A flat fixing point is formed between the bottoms of adjacent hollow web members, and the flat fixing point is fixed to the lower chord structure; the upper chord is implemented as a concrete rib upper chord, and the flat connecting point is fixedly connected to the concrete rib upper chord.

2. The prefabricated floor slab frame as described in claim 1, characterized in that: The plurality of hollow web members are wavy, the flat joints are applied to the crests of the wavy hollow web members, and the flat fixings are applied to the troughs of the wavy hollow web members.

3. The prefabricated floor slab frame as described in claim 2, characterized in that: The wavy hollow web bar is formed by continuously bending a single bar.

4. The prefabricated floor slab frame as described in claim 1, characterized in that: The flat connector has a connecting surface, which is either a plane or a concave surface whose shape adapts to the outer contour of the upper chord.

5. The prefabricated floor slab frame as described in claim 1, characterized in that: The bottom or top of the upper chord of the concrete rib is provided with a reinforcing bar groove along the direction perpendicular to the rib length.

6. The prefabricated floor slab frame as described in claim 5, characterized in that: The upper chord of the concrete rib is provided with a first structural reinforcement along the length of the rib, and the first structural reinforcement is connected to or in contact with the flat joint.

7. A prefabricated truss floor slab, characterized in that, include: The prefabricated floor slab frame and base plate according to any one of claims 1-6, wherein the flat fixing part of the prefabricated floor slab frame is fixed to the base plate, and a cast-in-place layer is poured on the base plate, the cast-in-place layer filling the prefabricated floor slab frame.

8. The prefabricated truss floor slab as described in claim 7, characterized in that: The multiple hollow web members are connected in a wave-like shape. The crests of the wave-like hollow web members are made into flat joints, which are connected to the upper chord. The troughs of the wave-like hollow web members are made into flat fixing points, which are fixed to the base plate.

9. The prefabricated truss floor slab as described in claim 7, characterized in that: The base plate is provided with a second structural rib and a third structural rib, which are arranged in a crisscross pattern.

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