Composite structural beam and composite structural floor

Abstract

The present application provides a composite structure beam and a composite structure floor, wherein the two ends of the composite structure beam are solid concrete beam sections and the middle part is a hollow section. For a continuous beam or a frame beam, the lower chord of the solid concrete beam section is in compression and the upper chord is in tension, and the hollow section is in tension in the lower chord and in compression in the upper chord. In this way, the compression zone of the composite structure beam is all concrete, which is low in cost and high in efficiency, and the hollow section in the middle part facilitates the installation of pipelines and greatly reduces the weight of the prefabricated beam.

Description

Technical Field

[0001] This invention relates to the field of prefabricated buildings, and more particularly to composite structural beams and composite structural floor slabs. Background Technology

[0002] Currently, steel beams used to connect steel frame structures and columns require a large amount of steel and are expensive, which hinders the promotion of steel structures. In addition, the prefabricated parts of beams used in precast concrete structures are too heavy, making hoisting difficult and expensive. Summary of the Invention

[0003] One objective of this invention is to save steel consumption and facilitate assembly installation;

[0004] Another objective of this invention is to provide a prefabricated structure that facilitates the installation of pipelines during subsequent decoration and saves overall floor height space.

[0005] To achieve any of the above objectives, the present invention provides a composite structural beam, characterized in that it comprises a truss beam body and two solid concrete beam segments, wherein the two solid concrete beam segments are respectively formed by casting a section of solid concrete at each end of the truss beam body.

[0006] A preferred embodiment of the present invention is that the truss beam includes an upper chord, a lower chord, and an intermediate web member; the intermediate web member is arranged in a wave-like shape between the upper chord and the lower chord.

[0007] In a preferred embodiment of the present invention, the intermediate web member is a steel pipe, the crests and troughs of the intermediate web member are flat, the crests are connected to the upper chord, and the troughs are connected to the lower chord.

[0008] In a preferred embodiment of the present invention, the upper chord is an upper chord bar, and the crest of the middle web bar is fixedly connected to the upper chord bar.

[0009] In a preferred embodiment of the present invention, the upper chord is an upper chord concrete rib, and the crest of the intermediate web member is embedded and fixed to the upper chord concrete rib.

[0010] In a preferred embodiment of the present invention, the lower chord is a lower chord concrete slab, and the troughs of the intermediate web members are embedded and fixed in the lower chord concrete slab.

[0011] In a preferred embodiment of the present invention, the lower chord is a lower chord concrete rod, and the trough of the intermediate web member is fixed to the lower chord concrete rod.

[0012] In a preferred embodiment of the present invention, the lower chord is connected between the two solid concrete beam segments.

[0013] In a preferred embodiment of the present invention, the portion between the two solid concrete beam segments of the truss beam is a hollow section.

[0014] The present invention also provides a composite structural floor slab, characterized in that it includes at least a non-removable base slab, a cast-in-place layer, and a composite structural beam, wherein a support plate is provided on the intermediate web member of the composite structural beam, the non-removable base slab is provided on the support plate, the cast-in-place layer is cast on the non-removable base slab, and the crests of the upper chord and the intermediate web member are located in the cast-in-place layer.

[0015] The beneficial effects of this invention are as follows:

[0016] 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.

[0017] Traditional beams have never used steel pipe web members before, and the truss form is also being used for the first time.

[0018] The hollow tubes of the web members are flattened at the crests and troughs. The advantage of flattening is that the thickness of the flattened steel tube is only 1-3mm, which facilitates connection with the upper chord and reduces the thickness of the concrete when embedded in it, thereby reducing the weight of the precast layer or increasing the effective mechanical height of the truss.

[0019] Flattening the troughs helps to increase the interlocking area between the hollow web members and the lower chord concrete slab. Flattening the top of the hollow web members to form a flattened structure can avoid the problem of the intersection of the web members and the upper chord being eccentric in conventional steel truss structures, and reduce secondary bending moments. The thicker steel pipe section helps to increase the shear resistance of the frame and concrete.

[0020] The composite structural beam has solid concrete beam segments at both ends and a hollow section in the middle. For continuous beams, the mechanical action of the solid concrete beam segments is that the lower chord is under compression and the upper chord is under tension, while the mechanical action of the hollow section is that the lower chord is under tension and the upper chord is under compression. In this way, negative bending moments are formed at both ends of the composite structural beam, and the concrete is under compression, while positive bending moments are formed at the mid-span of the hollow section, and the upper chord concrete rib or upper chord member is under compression. Taking advantage of the fact that the concrete is under compression is relatively more favorable to the steel, the mechanical cost-effectiveness can be greatly increased. Attached Figure Description

[0021] Figure 1 It shows a three-dimensional view of the composite structural beam.

[0022] Figure 2 This diagram illustrates the connection between the solid concrete beam segment and the lower chord concrete slab in a composite beam structure.

[0023] Figure 3 The diagram shows the structure of the truss beam, which is a composite beam structure.

[0024] Figure 4 It shows the floor plan of the composite structure floor slab.

[0025] Figure 5The diagram shows the bending moment of the composite structural floor slab.

[0026] Figure 6 It expresses Figure 4 Cross-sectional view of AA.

[0027] Figure 7 It expresses Figure 6 Another structural form of the structure is shown in the diagram.

[0028] Figure 8 It expresses Figure 6 and Figure 7 The skeleton diagram. Detailed Implementation

[0029] The following description is provided to enable those skilled in the art to implement and use the invention and adapt it to 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Example 1

[0037] Please see Figure 1 , Figure 2 and Figure 3 This embodiment provides a composite structural beam, which includes a truss beam body 2 and two solid concrete beam segments 1; or, in other words, each composite structural beam includes a truss frame body and two solid concrete beam segments 1.

[0038] like Figure 1 As shown, the two solid concrete beam segments 1 are each formed by casting a section of solid concrete at each end of the truss beam body 2. Specifically, the solid concrete beam segment 1 is preferably a right trapezoid with the two hypotenuses facing each other, and the right-angled sides serving as the two ends of the composite structural beam. The two ends of the truss beam body 2 are embedded between the two solid concrete beam segments 1.

[0039] The section between the two solid concrete beam segments 1 is a hollow section. The hollow design at the mid-span allows for the passage of pipelines. When the composite structural beam is used as a floor structural beam, the hollow design significantly saves floor height.

[0040] The truss beam 2 includes an upper chord 21, a lower chord, and an intermediate web member 22. The intermediate web member 22 is arranged in a wave-like shape between the upper chord 21 and the lower chord. The truss beam 2 can be a conventional triangular double-row truss, but in this embodiment, when used as a structural beam, a single-row truss beam 2 is sufficient to meet the strength requirements.

[0041] In a preferred embodiment of this invention, the intermediate web member 22 is a steel pipe, and the crests and troughs of the intermediate web member 22 are flattened, with the crests connected to the upper chord 21 and the troughs connected to the lower chord. The flattened crests and troughs are obtained by flattening the steel pipe.

[0042] Because the web members 22 are made of hollow steel tubes, their out-of-plane stiffness is significantly increased compared to the reinforcing steel, allowing for the use of planar trusses. This significantly reduces truss processing and material costs compared to traditional triangular web member trusses. The hollow tubes of the web members 22 are flattened at the crests and troughs. Flattening reduces the thickness of the tube to only 1-2mm, facilitating connection to the top chord 21 and reducing concrete thickness when embedded, thus decreasing the weight of the precast layer or increasing the effective mechanical height of the truss. Flattening at the troughs increases the interlocking area between the hollow web members 22 and the concrete base slab. The flattened top of the hollow web members 22 avoids the eccentricity between the intersection of the web members 22 and the top chord 21 in conventional steel trusses, reducing secondary bending moments. The thicker steel tube cross-section also increases the shear resistance of the frame and concrete.

[0043] There are several ways to implement the upper chord 21. One way is that the upper chord 21 is an upper chord 21 rod, and the crest of the middle web rod 22 is fixedly connected to the upper chord 21 rod. The two can be fixed by welding.

[0044] Another option is that the upper chord 21 is an upper chord concrete rib, and the crests of the intermediate web members 22 are embedded and fixed to the upper chord concrete rib. The upper chord concrete rib is a concrete rib. After the crests are flattened, they can better interlock with the ribs, and the thickness requirement of the upper chord concrete rib is lower.

[0045] In addition, the upper chord 21 can also be made of steel pipe, trapezoidal steel and C-shaped steel, etc.

[0046] In this embodiment, the lower chord is a lower chord concrete slab 23, and the troughs of the intermediate web members 22 are embedded and fixed in the lower chord concrete slab 23. And as... Figure 2 As shown, the lower chord concrete slab 23 connects to the two solid concrete beam segments 1 to form an integral structure. In the specific implementation process, when the composite structural beam is prefabricated in the factory, the lower chord concrete slab 23 and the solid concrete beam segment 1 are cast integrally.

[0047] Alternatively, the lower chord is a lower chord member, and the troughs of the middle web members are fixed to the lower chord member. Preferably, the lower chord member is a lower chord steel pipe or a lower chord metal rod, and the troughs of the middle web members are flattened and welded to the lower chord member.

[0048] Please combine Figure 5From a force perspective, as a continuous beam, the composite structural beam has a core concrete beam segment 1 where the lower chord is under compression and the upper chord 21 is under tension, while the open web segment has a lower chord under tension and the upper chord 21 under compression. This results in negative bending moments at both ends of the composite structural beam, while the open web segment experiences a positive bending moment at mid-span, and the upper chord 21 is under compression, thus saving materials.

[0049] The beneficial effects of this invention are as follows:

[0050] 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.

[0051] Traditional beams have never used steel pipe web members before, and the truss form is also being used for the first time.

[0052] The hollow tubes of the web members are flattened at the crests and troughs. The advantage of flattening is that the thickness of the flattened steel tube is only 1-3mm, which facilitates connection with the upper chord and reduces the thickness of the concrete when embedded in it, thereby reducing the weight of the precast layer or increasing the effective mechanical height of the truss.

[0053] Flattening the troughs helps to increase the interlocking area between the hollow web members and the lower chord concrete slab. Flattening the top of the hollow web members to form a flattened structure can avoid the problem of the intersection of the web members and the upper chord being eccentric in conventional steel truss structures, and reduce secondary bending moments. The thicker steel pipe section helps to increase the shear resistance of the frame and concrete.

[0054] The composite structural beam has solid concrete beam segments at both ends and a hollow section in the middle. For continuous beams, the mechanical action of the solid concrete beam segments is that the lower chord is under compression and the upper chord is under tension, while the mechanical action of the hollow section is that the lower chord is under tension and the upper chord is under compression. In this way, negative bending moments are formed at both ends of the composite structural beam, and the concrete is under compression, while positive bending moments are formed at the mid-span of the hollow section, and the upper chord concrete rib or upper chord member is under compression. Taking advantage of the fact that the concrete is under compression is relatively more favorable to the steel, the mechanical cost-effectiveness can be greatly increased.

[0055] Example 2

[0056] This embodiment provides a composite structural floor slab, comprising at least a non-removable base slab 6 (or a precast layer of a composite slab), a cast-in-place layer 7, and a composite structural beam. The composite structural beam has a support plate 5 on its intermediate web member 22, the non-removable base slab 6 is mounted on the support plate 5, floor slab components are mounted on the non-removable base slab 6, and the cast-in-place layer 7 is cast onto the floor slab components on the non-removable base slab 6. The upper chord 21 and the crests of the intermediate web member 22 of the composite structural beam are located within the cast-in-place layer 7.

[0057] The floor slab components are the steel reinforcement layers of the floor slab, which are preferably steel pipe trusses. Figure 6Figure 7 shows the position of the upper chord 8 of the steel pipe truss, while the rest is not shown. The installation of a steel pipe truss in the floor slab pouring layer 7 is a necessary means of pouring the floor slab. Although specific illustrations of the steel pipe web members of the steel pipe truss are not given here, those skilled in the art should be able to deduce them from the description.

[0058] In this embodiment, the non-removable bottom slab 6 is interpreted as a structural component of various floor slabs, including the bottom precast layer of the composite slab, which is a precast concrete slab, and the composite slab is formed after concrete is poured on the precast layer; or the non-removable bottom formwork, which serves as the bottom formwork template for the structural floor pouring, and directly serves as part of the floor structure after pouring without demolding.

[0059] Please combine Figures 4-8 , Figure 4 This is an elevation diagram of a composite structural floor slab, where the two sides are the main building structure, which can be the building's columns or walls, etc., and its main function is to provide installation points for the composite structural beams.

[0060] Figure 3 A support plate 5 is provided on the web member 22 to facilitate the installation of the non-removable base plate 6, which rests on the support plate 5. Specifically, each floor slab has multiple composite structural beams, and the non-removable base plate 6 rests on the support plates 5 of these composite structural beams. Simultaneously, the support plate 5 also prevents grout leakage between the non-removable base plates 6. Because there are non-removable base plates 6 on both sides of the composite structural beams, resting them on the support plate 5 prevents grout from leaking through the gaps between the non-removable base plates 6 during the pouring of the concrete layer 7.

[0061] Furthermore, temporary supports 4 can be installed at the bottom of the support plate 5 during pouring, and can be removed after the poured layer 7 has completely solidified. The temporary supports 4 are located on both sides of the web member 22 and are installed on the lower chord concrete slab 23, as shown in the diagram. Figure 6 A small pouring space 41 is created in the middle, allowing the grout of the pouring layer 7 to be poured within the pouring space 41, thus protecting the web member 22. Alternatively, as... Figure 7 As shown, it is closely attached to the web member 22.

[0062] The beneficial effects of this invention are as follows:

[0063] The composite structural beam has solid concrete beam segments at both ends and a hollow section in the middle. For continuous beams, the mechanical action of the solid concrete beam segments is that the lower chord is under compression and the upper chord is under tension, while the mechanical action of the hollow section is that the lower chord is under tension and the upper chord is under compression. In this way, negative bending moments are formed at both ends of the composite structural beam, and the concrete is under compression, while positive bending moments are formed at the mid-span of the hollow section, and the upper chord concrete rib or upper chord member is under compression. Taking advantage of the fact that the concrete is under compression is relatively more favorable to the steel, the mechanical cost-effectiveness can be greatly increased.

[0064] 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 composite structural beam, characterized in that, The structure comprises a truss beam and two solid concrete beam segments, each formed by casting a section of solid concrete at each end of the truss beam. The truss beam includes an upper chord, a lower chord, and an intermediate web member. The intermediate web member is wavy and positioned between the upper and lower chords. The lower chord connects the two solid concrete beam segments. The composite beam is constructed such that, as a continuous beam, the solid concrete beam segments are in a negative bending moment region, with the lower chord under compression and the upper chord under tension; the truss beam is in a positive bending moment region, with the lower chord under tension and the upper chord under compression, thus concentrating the concrete material in the compression region of the structure. The intermediate web member is a steel pipe, with flat crests and troughs. The crests connect to the upper chord, and the troughs connect to the lower chord. The upper chord is a concrete rib, and the crests of the intermediate web member are embedded and fixed to the upper chord concrete rib.

2. The composite structural beam as described in claim 1, characterized in that: The lower chord is a lower chord concrete slab, and the troughs of the intermediate web members are embedded and fixed in the lower chord concrete slab.

3. The composite structural beam as described in claim 1, characterized in that: The lower chord is the lower chord bar, and the trough of the middle web bar is fixed to the lower chord bar.

4. The composite structural beam as described in claim 1, characterized in that: The portion between the two solid concrete beam segments of the truss beam is a hollow section.

5. A composite structural floor slab, characterized in that, It includes at least a non-removable base plate, a casting layer, and a composite structural beam as described in claim 2, 3, or 4. The intermediate web members of the composite structural beam are provided with support plates, the non-removable base plate is provided on the support plates, the casting layer is cast on the non-removable base plate, and the crests of the upper chord and the intermediate web members are located in the casting layer.

Images