Steel grid embedded assembly type composite floor slab
By setting steel truss floor decks in steel grid embedded prefabricated composite floor slabs, the shrinkage cracking and shrinkage stress problems of concrete in large-span spatial structures are solved, steel-concrete synergistic force is achieved, and the overall performance and construction accuracy of the structure are improved.
Patent Information
- Application Number
- CN202422609100.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-10-29
AI Technical Summary
The existing steel-concrete composite grid structure has problems with long-term concrete shrinkage cracking and large shrinkage stress in large-span spatial structures. It is also difficult to construct and position the structure, and has large design and analysis errors.
Steel grid embedded prefabricated composite floor slabs are adopted. By fixing the steel truss floor deck between the steel grid chords, the concrete slab and the steel components are subjected to the force synergistically to form discrete units, avoiding the overall pouring of large-volume concrete and reducing shrinkage stress.
It effectively avoids long-term shrinkage and cracking of concrete, improves the coordinated deformation capacity of steel and concrete, reduces structural height and weight, and improves the overall performance and construction accuracy of the composite structure.
Smart Images
Figure CN223330070U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of space structures, in particular to a steel grid embedded assembled composite floor slab. Background Art
[0002] Realizing the ecological utilization of building roofs through roof greening is an effective means of improving the urban environment. In recent years, an increasing number of large-span spatial structures have been designed with earth-covered structures such as sky gardens, sports fields, and plant cultivation. These projects are characterized by large roof loads and high requirements for comfort, corrosion resistance, and durability. The truss structures and grid structures commonly used in current projects are not well adapted to these needs. To meet the above requirements, steel-concrete composite grid structures are increasingly being used in similar projects. This structure consists of an upper chord, an upper chord concrete slab, web members, and a lower chord. The upper chord concrete slab is laid above the upper chord, giving full play to the advantages of the upper chord concrete slab being in compression and the lower chord steel structure being in tension. It has the characteristics of high rigidity, high bearing capacity, good durability, and excellent economy.
[0003] However, the composite grid structure also has inevitable disadvantages: 1. Since the concrete slab is connected to the upper chord through connecting bolts, a detailed finite element analysis is required to obtain the local bending moment of the slab in each connection area and the shear force between the connection surface of the concrete slab and the upper chord, and the corresponding connecting bolts and steel bars are set. In addition, the shear deformation of the bolts will cause relative displacement between the concrete slab and the upper chord of the steel grid. Therefore, the design calculation will overestimate the stiffness of the composite structure, resulting in large design analysis errors; 2. Since the concrete slab is placed on the upper part of the upper chord, and the spatial grid structure is mostly a spatial curved surface, the construction positioning of the concrete structure is difficult, and the accuracy of steel bar laying and concrete pouring is poor; 3. The integral pouring of large-volume concrete has the problem of long-term shrinkage cracking, and the concrete shrinkage causes inconsistent steel-concrete deformation, which generates large shrinkage stress inside the structure. Utility Model Content
[0004] The purpose of the utility model is to provide a steel grid embedded assembled composite floor slab to solve the problems of long-term shrinkage cracking of concrete and large shrinkage stress in the above-mentioned prior art.
[0005] To achieve the above purpose, the present invention provides the following solutions:
[0006] The utility model provides a steel grid embedded assembled composite floor slab, comprising a plurality of steel grid chords arranged in a grid shape, wherein accommodating spaces are formed between the steel grid chords, and a steel bar truss floor deck is fixedly arranged in each of the accommodating spaces.
[0007] Preferably, the cross section of the steel grid chord is in an inverted T shape.
[0008] Preferably, the steel grid chord includes a flange and a web fixedly arranged on the flange, and the flange and the web are both fixedly connected to the steel bar truss floor deck.
[0009] Preferably, a plurality of connecting lugs are provided between the flange and the web, and the connecting lugs are evenly arranged along the extension direction of the steel grid chord.
[0010] Preferably, the connecting ear plate is rectangular or trapezoidal.
[0011] Preferably, the steel truss floor deck includes a steel truss formwork, a concrete slab cast on the steel truss formwork, and in-slab steel bars arranged inside the concrete slab.
[0012] Preferably, the steel truss formwork and the concrete slab are both fixedly connected to the flange by bolts.
[0013] Preferably, the concrete slab and the web are fixedly connected by bolts.
[0014] Compared with the prior art, the utility model has achieved the following technical effects:
[0015] The utility model provides a steel grid embedded assembled composite floor slab, in which the steel grid chords are arranged in a grid pattern, and a plurality of accommodating spaces are formed between the steel grid chords. The steel truss floor decking can be fixed in the accommodating spaces and distributed in the form of discrete units. Compared with the traditional large-volume concrete integral casting, it can avoid the problem of long-term shrinkage cracking and reduce the concrete shrinkage stress. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 This is a structural diagram of the steel grid embedded assembled composite floor provided by the utility model;
[0018] Figure 2 An exploded view of the steel grid embedded assembled composite floor provided by the utility model;
[0019] Figure 3 Detailed connection diagram of each component in the steel grid embedded assembled composite floor provided by the utility model;
[0020] In the figure: 1- steel grid chord; 2- connecting ear plate; 3- stud; 4- steel truss floor deck; 41- steel truss formwork; 42- steel bars in the slab. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0022] The purpose of the utility model is to provide a steel grid embedded assembled composite floor slab to solve the problems of long-term shrinkage cracking and large shrinkage stress of concrete in the prior art.
[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.
[0024] The utility model provides a steel grid embedded assembled composite floor slab, such as Figures 1 to 3 As shown, it includes a plurality of steel grid chords 1 arranged in a grid shape, and accommodation spaces are formed between the steel grid chords 1. A steel truss floor deck 4 is fixedly arranged in each accommodation space.
[0025] In some embodiments, the cross section of the steel grid chord 1 is in an inverted T shape.
[0026] In some embodiments, the steel grid chord 1 includes a flange and a web fixedly disposed on the flange, and both the flange and the web are fixedly connected to the steel truss floor deck 4 .
[0027] In some embodiments, a plurality of connecting lugs 2 are provided between the flange and the web. The connecting lugs 2 are evenly arranged at intervals of 500 mm along the extension direction of the steel grid chord 1 to improve the out-of-plane load-bearing capacity of the flange of the steel grid chord 1 .
[0028] In some embodiments, the connecting ear plate 2 is rectangular or trapezoidal.
[0029] In some embodiments, the steel truss floor deck 4 includes a steel truss formwork 41, a concrete slab cast on the steel truss formwork 41, and an inner slab steel bar 42 arranged inside the concrete slab. The steel truss formwork 41 can be made of a 1.5 mm thick galvanized steel plate formwork, a high-strength concrete formwork, or a detachable formwork, such as Figure 3 As shown, when the steel truss floor deck 4 needs to be provided with internal steel bars 42, i.e., negative moment steel bars, at the supports, holes can be opened in the web of the steel grid chord 1 and the negative moment steel bars can be passed through.
[0030] In some embodiments, the steel truss floor deck 4 is embedded between the steel grid chords 1 and is firmly connected to the steel grid chords 1 through the bolts 3, so as to achieve the purpose of coordinated force between the steel bars and the concrete slab.
[0031] In some embodiments, the steel truss formwork 41 and the concrete slab are fixedly connected to the flange through bolts 3. The bolts 3 are evenly arranged on the flange with an interval of 200 mm. The bolts 3 can effectively connect the steel structure and the concrete slab, and evenly transfer the load to each connection position, thereby ensuring the connection performance of the steel-concrete contact surface.
[0032] In some embodiments, the concrete slab and the web are also fixedly connected by bolts 3 , and the bolts 3 are evenly arranged on the web at intervals of 200 mm.
[0033] Compared with the traditional method of laying floor slabs on top of steel grids, the use of prefabricated composite slabs embedded in steel grids has the following advantages: (1) Since the concrete wraps around the T-shaped steel members, the durability of the steel members can be effectively improved; (2) The concrete slabs are tightly embedded in the steel grid, and the steel-concrete collaborative deformation ability is better, which improves the overall performance of the composite structure; (3) The concrete slabs are separated into discrete units by the webs of the T-shaped steel members, which can effectively solve the problem of long-term shrinkage cracking in the integral pouring of large-volume concrete and reduce the shrinkage stress of concrete; (4) The structural height is reduced, making the structure lighter and thinner, and the architectural effect is better.
[0034] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.
Claims
1. A steel grid embedded assembled composite floor slab, characterized by: include: A plurality of steel grid chords are arranged in a grid shape, with accommodation spaces formed between the steel grid chords, and a steel truss floor deck is fixedly arranged in each of the accommodation spaces.
2. The steel grid embedded assembled composite floor slab according to claim 1, characterized in that: The cross section of the steel grid chord is in an inverted T shape.
3. The steel grid embedded assembled composite floor slab according to claim 2, characterized in that: The steel grid chord comprises a flange and a web fixedly arranged on the flange, and both the flange and the web are fixedly connected to the steel bar truss floor deck.
4. The steel grid embedded assembled composite floor slab according to claim 3, characterized in that: A plurality of connecting lugs are provided between the flange and the web, and the connecting lugs are evenly arranged along the extension direction of the steel grid chord.
5. The steel grid embedded assembled composite floor slab according to claim 4, characterized in that: The connecting ear plate is rectangular or trapezoidal.
6. The steel grid embedded assembled composite floor slab according to claim 3, characterized in that: The steel bar truss floor deck comprises a steel bar truss formwork, a concrete slab cast on the steel bar truss formwork, and in-slab steel bars arranged inside the concrete slab.
7. The steel grid embedded assembled composite floor slab according to claim 6, characterized in that: The steel bar truss formwork and the concrete slab are both fixedly connected to the flange via bolts.
8. The steel grid embedded assembled composite floor slab according to claim 6, characterized in that: The concrete slab and the web are fixedly connected by bolts.