Building warehouse full-assembly type steel truss-concrete composite floor system

Abstract

The invention relates to a fully-fabricated steel truss-concrete composite floor system for a building warehouse. Comprising the steel pipe columns, the main beams, the steel trusses and the prefabricated slabs, the composite floor system structure composed of the steel trusses, the main beams and the prefabricated slabs has the multidirectional large-span high-bearing function, the steel truss and main beam connecting structure is rapid, convenient and high in connecting stability, and the prefabricated slabs and the steel trusses are connected stably and reliably and high in integrity in an inserted connection and post-pouring mode.

Description

Technical Field

[0001] This invention relates to a fully prefabricated steel truss-concrete composite floor system for buildings. Background Technology

[0002] Bulk grain multi-story warehouses, as core facilities of modern grain storage systems, boast advantages such as high space utilization, convenient mechanized operations, and strong structural stability. Leveraging their vertical storage model, they exhibit enormous development potential in densely populated large cities and major grain-producing areas with scarce land resources. Compared to traditional flat warehouses, multi-story warehouses can save 50%-70% of land, making them particularly suitable for land-scarce areas such as first-tier cities and port hubs, aligning with the intensive development concept of "utilizing vertical space." In bulk grain multi-story warehouses, the floor slab, as the core load-bearing and operational component, must meet the following stringent requirements: heavy load-bearing capacity, large span, pipeline integration compatibility, rapid construction, and maintainability. However, current bulk grain warehouse floors are still primarily made of cast-in-place reinforced concrete, whose inherent defects—heavy weight, low construction efficiency, and severe resource consumption—create a sharp contradiction with the demands of multi-story warehouses.

[0003] Therefore, how to solve the problems of large span, heavy load, and ease of construction in multi-story warehouses has become an urgent technical issue. Summary of the Invention

[0004] The purpose of this invention is to provide a fully prefabricated steel truss-concrete composite floor slab for buildings, which improves construction convenience through prefabricated construction and achieves high load-bearing capacity under large spans through a composite floor slab structure of multi-directional load-bearing steel trusses, main beams, and precast slabs.

[0005] The technical solution of the present invention is as follows: A fully prefabricated steel truss-concrete composite floor system for a building includes: There are four steel pipe columns, arranged in a rectangular pattern. There are four main beams located in the same plane, each connected between two adjacent steel pipe columns; The main beam includes an upper beam plate and a lower beam plate arranged in parallel. The upper beam plate and the lower beam plate are connected by two layers of web plates to form a box girder structure. Multiple ribs are arranged at intervals along the length of the upper beam plate and the lower beam plate. The surface of the rib plate is perpendicular to the length of the upper beam plate. The width of the lower beam plate is greater than the width of the upper beam plate. The steel truss includes multiple main trusses and secondary trusses arranged laterally and longitudinally. The main trusses and secondary trusses are vertically connected to form multiple rectangular grids. Both the main trusses and secondary trusses include parallel upper chords and lower chords. The ends of the upper chords and lower chords are connected by vertical web members, and the upper chords and lower chords are connected by diagonal web members. The lower ends of the main trusses and secondary trusses overlap the lower beam plate and are connected by bolts at the overlap. The vertical web members and ribs are connected by L-shaped plates and bolts. Shear studs are spaced apart on the upper beam plate and upper chord. The precast slab consists of multiple pieces, each with embedded reinforcing bars at both ends. The two ends of the precast slab are supported on the upper beam of a pair of main beams by the embedded reinforcing bars, and the embedded reinforcing bars and the shear studs on the upper beam are covered by post-cast concrete. The precast slab has reserved connection holes corresponding to the shear studs on the upper chord. The connection between the precast slab and the steel truss is achieved by post-casting concrete into the reserved connection holes. The upper chord of the steel truss is in contact with the lower surface of the precast slab.

[0006] The beneficial effects of this technical solution: During the construction of the fully prefabricated steel truss-concrete composite floor slab for the warehouse, the main beam is first connected to the steel pipe column, and then the steel truss is spliced ​​and connected to the main beam. The connection process is all done with quick bolt connections. Then, each precast slab is spliced ​​in sequence and connected to the main beam, steel truss, and precast slab. After connection, post-cast concrete is used to achieve the final connection and sealing, thus completing the floor slab construction. Compared with the existing on-site casting construction method, this technical solution has the advantages of fast and efficient construction and strong load-bearing capacity. Moreover, the space of the steel truss can be used to install cable trays to lay equipment cables, pipelines, etc., saving equipment layer height and increasing the net height of the warehouse space. The combined connection load-bearing structure of steel truss, main beam, and precast slab utilizes the multi-directional load of the steel truss to directly act on the main beam, and the main beam acts on the steel pipe column, thereby achieving heavy load-bearing capacity under large span. The connection structure between the steel truss and the main beam not only has strong load-bearing capacity and effectively suppresses in-plane shear deformation to meet the requirements of bulk grain stacking and equipment dynamic load, but also makes the connection process convenient and fast.

[0007] Based on the above scheme, the following improvements are made: the upper surface of the upper chord is flush with the upper surface of the upper beam plate.

[0008] Based on the above scheme, further improvements are made as follows: the length of the top chord of the main truss is the same as the distance between the two corresponding main beams; the length of the bottom chord of the main truss is greater than the distance between the two corresponding main beams; and the lengths of the top and bottom chords of the secondary truss are the same as the distance between the two adjacent main trusses they contact. Since the top and bottom chords of the main truss span the entire length between the two main beams, they have strong load-bearing capacity and therefore serve as the primary load-bearing units. The secondary trusses, connected between the main trusses by bolts and lap joints with connecting plates, serve as auxiliary load-bearing units.

[0009] Based on the above scheme, further improvements are made as follows: the upper and lower chords of the main truss are vertically connected to the corresponding connection points of the secondary truss, and the upper and lower chords of the secondary truss are respectively connected to the corresponding connectors. The upper and lower chords of the secondary truss are connected to the corresponding connectors by means of lap plates and bolts.

[0010] Based on the above scheme, the following improvements are made: the web is a corrugated web, which has a higher load-bearing capacity in all directions.

[0011] Based on the above scheme, the following improvements are made: the cross-sections of the upper chord, lower chord, vertical web members, and diagonal web members of the steel truss are all I-shaped.

[0012] Based on the above scheme, further improvements are made as follows: the reserved connection holes include cross holes and straight holes, with the cross holes corresponding to the connection between the main truss and the secondary truss. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a specific embodiment of a fully prefabricated steel truss-concrete composite floor slab for a building according to the present invention. Figure 2 for Figure 1 Top view; Figure 3 for Figure 2 Sectional view at point AA; Figure 4 Side view of the main beam; Figure 5 A 3D view before assembling the precast panels; Figure 6 for Figure 5 A magnified view of a portion of point a; Figure 7 for Figure 5 A magnified view of a section at point b in the middle; Figure 8 This is a 3D view of the connection process between the precast slab and the main beam and steel truss; Figure 9 A three-dimensional view of the precast slabs, the steel truss, and the connection structure between the precast slabs; Figure 10 for Figure 9 The main view; Figure 11 for Figure 10 Sectional view at point BB; Figure 12 for Figure 11 A magnified view of a section at point D; Figure 13 for Figure 12 The corresponding 3D image; Figure 14 for Figure 11 A magnified view of a section at point E in the middle; Figure 15 for Figure 14 The corresponding 3D image; Figure 16 for Figure 10 Sectional view at CC; Figure 17 for Figure 16 A magnified view of a section at point F in the middle; Figure 18 for Figure 17 A three-dimensional view of the pre-embedded connector on one side of the corresponding structure; Figure 19 for Figure 17 The corresponding 3D image; Figure 20 A 3D view of the slotted opening between the precast slab and the steel truss; In the diagram: 1-Steel pipe column, 2-Main beam, 21-Upper beam plate, 22-Lower beam plate, 23-Web plate, 24-Rib plate, 3-Steel truss, 31-Main truss, 311-Upper chord of the main truss, 312-Lower chord of the main truss, 313-Vertical web members of the main truss, 314-Diagonal web members of the main truss, 32-Secondary truss, 321-Upper chord of the secondary truss, 322-Lower chord of the secondary truss, 323-Vertical web members of the secondary truss, 324-Diagonal web members of the secondary truss, 33-Connector, 34-Layer plate, 4-Threaded bolt 5-Shear stud group, 6-L-shaped plate, 7-Precast slab, 71-Embedded reinforcing bar, 72-Reserved connection hole, 721-Cross hole, 722-Straight hole, 73-First connecting component, 731-Reserved reinforcing bar head, 732-Lap groove, 733-Joint groove, 734-Lap reinforcing bar, 74-Second connecting component, 741-Embedded upper steel plate, 742-Embedded lower steel plate, 743-Embedded connecting bar, 744-Butt groove, 745-Lap steel plate, 746-Stress hole, 8-Post-cast concrete. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0016] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0017] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0018] A specific embodiment of the fully prefabricated steel truss-concrete composite floor slab of the present invention is as follows: Figure 1-8 As shown, the prefabricated steel truss-concrete composite floor slab and its precast slab connection structure serve as the floor slab structure for each floor of the building warehouse. It has the requirements of large span and heavy load. The composite floor slab of each floor includes an overall load-bearing system composed of main beam 2, steel truss 3 and precast slab 7. The floor slabs of each floor can share four steel pipe columns 1. That is, the steel pipe columns 1 are perpendicular to the ground and connected to each floor slab, serving as the main vertical load-bearing structure of each floor slab.

[0019] like Figure 1 As shown, there are four steel pipe columns 1, arranged in a rectangular shape. The steel pipe columns 1 can be made of steel-concrete structure and are embedded in the concrete foundation of the ground.

[0020] like Figure 1As shown, each floor slab has four main beams 2 located in the same plane, connected between two adjacent steel pipe columns 1. The main beams 2 include parallel upper beam plates 21 and lower beam plates 22, which are connected by two layers of web plates 23 to form a box girder structure. This connection can be achieved by welding or bolting. Both the upper beam plates 21 and lower beam plates 22 are steel plates with stiffeners. Multiple ribs 24 are spaced apart along the length of the upper beam plates 21 and 22. The surface of the ribs 24 is perpendicular to the length of the upper beam plates 21. The width of the lower beam plates 22 is greater than the width of the upper beam plates 21. The ribs 24 are thickened steel plates with a central opening, welded to the upper beam plates 21, lower beam plates 22, and the web plates 23 on both sides. The web plates 23 can be corrugated or flat.

[0021] like Figure 5 As shown, the steel truss 3 includes multiple main trusses 31 and secondary trusses 32 arranged laterally and longitudinally. The main trusses 31 and secondary trusses 32 are vertically connected to form multiple rectangular grids. Both the main trusses 31 and secondary trusses 32 include parallel upper chords and lower chords. The ends of the upper chords and lower chords are connected by vertical web members, and the upper chords and lower chords are connected by diagonal web members. The lower ends of the main trusses 31 and secondary trusses 32 overlap on the lower beam plate 22, and are connected by bolts at the overlap. The vertical web members and the rib plate 24 are connected by L-shaped plates 6 and bolts. Shear studs 5 are spaced apart on the upper beam plate 21 and the upper chord.

[0022] like Figure 8 As shown, there are multiple precast slabs 7, each with pre-embedded reinforcing bars 71 at both ends. For the two outermost precast slabs 7, pre-embedded reinforcing bars 71 are also provided at their contact points with the main beam 2. The two ends of the precast slabs 7 are supported on the upper beam slabs 21 of a pair of main beams 2 by the pre-embedded reinforcing bars 71, and the pre-embedded reinforcing bars 71 and the shear stud group 5 on the upper beam slab 21 are covered by post-poured concrete. The precast slabs 7 have reserved connection holes 72 corresponding to the shear stud group 5 on the upper chord. The connection between the precast slabs 7 and the steel truss 3 is achieved by post-pouring concrete into the reserved connection holes 72. The upper chord of the steel truss 3 is in contact with the lower surface of the precast slabs 7.

[0023] like Figure 6 , 7As shown, the upper surface of the upper chord is flush with the upper surface of the upper beam 21. The length of the upper chord of the main truss 31 is the same as the distance between the two corresponding main beams 2, and the length of the lower chord of the main truss 31 is greater than the distance between the two corresponding main beams 2. The lengths of the upper and lower chords of the secondary truss 32 are the same as the distance between the two adjacent main trusses 31 they are in contact with. Since the upper and lower chords of the main truss 31 are the completed lengths spanning between the two main beams 2, they have a strong load-bearing capacity and therefore serve as the main load-bearing units. The secondary truss 32 is connected between the main trusses 31 by bolts and connecting plates, and plays an auxiliary load-bearing role. The upper and lower chords of the main truss 31 are vertically connected to the corresponding connection points of the secondary truss 32 with connectors 33. The upper and lower chords of the secondary truss 32 are respectively connected to the corresponding connectors 33, and are connected to the corresponding connectors 33 by lap plates 34 and bolts. The web 23 is a corrugated web 23, which has a higher load-bearing capacity in all directions. The cross-sections of the upper chord, lower chord, vertical web members, and diagonal web members of the steel truss 3 are all I-shaped. The reserved connection holes 72 include cross holes 721 and straight holes 722. The cross holes 721 are respectively set at the connection points of the main truss 31 and the secondary truss 32.

[0024] In the construction of the prefabricated steel truss-concrete composite floor slab and its precast slab connection structure, the main beam 2 is first connected to the steel pipe column 1. Then, the steel truss 3 is spliced ​​and connected to the main beam 2. All connections are made using quick bolt connections. Next, the precast slabs 7 are sequentially spliced ​​and connected to the main beam 2, steel truss 3, and precast slabs 7. After connection, post-cast concrete is used to achieve the final connection and sealing, thus completing the floor slab construction. Compared to existing on-site casting construction methods, this technical solution has the advantages of fast and efficient construction and high load-bearing capacity. Furthermore, the space of the steel truss 3 can be used to install cable trays for laying equipment cables and pipelines, saving equipment layer height and increasing the net height of the warehouse space. The combined load-bearing structure of the steel truss 3, main beam 2 and precast slab 7 utilizes the multi-directional load-bearing capacity of the steel truss 3 to directly act on the main beam 2, and the main beam 2 acts on the steel pipe column 1, thereby achieving heavy load-bearing capacity under large span. The connection structure between the steel truss 3 and the main beam 2 not only has a strong load-bearing capacity and effectively suppresses in-plane shear deformation to meet the requirements of bulk grain stacking and equipment dynamic load, but also makes the connection process convenient and quick.

[0025] like Figure 9-20 As shown, the connection structures between the precast slab 7 and the steel truss 3, as well as between the precast slabs 7 themselves, are illustrated. Regarding the connection between the precast slab 7 and the steel truss 3, firstly, the upper surface of the steel truss 3 can contact the lower surface of the precast slab 7, relying on the steel truss 3 to support the precast slab 7. Secondly, as... Figure 9 , 10As shown, the precast slab 7 has a reserved connection hole 72 at the anti-shear nail group at the corresponding steel truss 3. After alignment and insertion, the anti-shear nail group is located in the reserved connection hole 72. Then, concrete or grout is poured into the reserved connection hole 72 to connect the precast slab 7 and the steel truss 3 into one piece. The connection between the corresponding precast slabs 7 also needs to realize the connection between the precast slab 7 and the steel truss 3.

[0026] Specifically, such as Figure 9 As shown, the reserved connection holes 72 include a cross hole 721 and a straight hole 722. The cross hole 721 is correspondingly set at the vertical connection between the main truss 31 and the secondary truss 32. The shear stud groups 5 on the main truss 31 and the secondary truss 32 are all located in the cross hole 721. By pouring concrete or grouting, the connection force between the shear stud groups 5 and the concrete can be used to fix the precast slab 7 to the steel truss 3. The shear stud groups 5 can also bear the horizontal shear force. The structure at the cross hole 721 is shown in the figure. Figure 14 , 15 As shown, the structure of the 722 slotted hole is as follows: Figure 20 As shown.

[0027] Precast slabs are assembled on top of the steel truss, with joint grooves on both sides of each slab. The joint grooves of adjacent precast slabs are joined together to form a grouting groove with an open top and a closed bottom for grouting. Multiple first connecting components and second connecting components are symmetrically arranged on both sides of the precast slabs. The connection structure between precast slabs 7 is relatively complex. In addition to connecting precast slabs 7 to each other, it also needs to connect with the steel truss 3. A first connecting component is provided at the corresponding position of the steel truss 3, while a second connecting component 74 is provided at other positions. The first connecting component and the second connecting component 74 are distributed along the edge of the precast slab 7, and there is more than one of them. Specifically, the first connecting component is provided below a certain group of shear studs. The first connecting component includes a lap groove on the side of the precast slab and multiple pre-reserved steel bar heads extending horizontally from the lap groove. The lapped steel bars simultaneously lap onto the pre-reserved steel bar heads of two adjacent precast slabs to connect them. The corresponding group of shear studs on the steel truss extends from bottom to top into the lap groove. The upper surface of the steel truss forms the bottom of the lap groove to facilitate grouting into the lap groove. The second connecting component includes pre-reserved steel bar heads extending horizontally from the edge of the precast slab. An upper steel plate and a lower steel plate are embedded. The upper and lower steel plates are connected to the embedded connecting bars in the precast slab. The upper and lower steel plates are located above and below the joint groove, respectively. The extension length of the lower steel plate is greater than that of the upper steel plate, so that after the second connecting components of adjacent precast slabs are connected, there is a certain distance between the two upper steel plates and between the two lower steel plates. The two adjacent upper steel plates and the two adjacent lower steel plates are fixedly connected by overlapping steel plates.

[0028] Among them, such as Figure 11 , 12 As shown in Figure 13, the first connecting component includes lap grooves 732 respectively disposed at the edges of the precast slabs 7. Multiple pre-reserved steel bar heads 731, in two groups of two each, extend horizontally from the lap grooves 732. The pre-reserved steel bar heads 731 of adjacent precast slabs 7 are coaxially connected and then welded together by lapped steel bars 734 that overlap with the pre-reserved steel bar heads 731. This allows the pre-reserved steel bar heads 731 of adjacent precast slabs 7 to form an integral load-bearing structure through the connection of the lapped steel bars 734, capable of withstanding axial tensile force and vertical shear force. The shear stud group 5 extending from the lower steel truss 3 extends into the lap grooves 732. Subsequent pouring of concrete and grouting into the lap grooves 732 and joint grooves 733 connects the steel truss 3 to the two precast slabs 7 into an integral structure.

[0029] like Figure 16-19 As shown, the second connecting assembly 74 includes embedded connectors respectively disposed at the edges of the precast slab 7. The precast slab 7 is joined together through the embedded connectors and then cast to form an integral structure. A butt joint groove is provided on the precast slab at the corresponding overlapping steel plate to accommodate the overlapping steel plate. The butt joint groove facilitates the casting of concrete to connect the overlapping steel plate to the concrete for coordinated load-bearing. The embedded connectors include an upper embedded steel plate 741, a lower embedded steel plate 742, a connecting rib 743, and a butt joint groove 744. The lower embedded steel plate 742 extends beyond the upper embedded steel plate 741, and the outer ends of the lower embedded steel plates 742 of two adjacent precast slabs 7 can contact and fit together. A certain gap is reserved in the middle of the upper embedded steel plates 741 during splicing to facilitate the pouring of concrete into the butt joint groove 744. An overlapping steel plate 745 is also used between the two upper embedded steel plates 741, and they are welded together to achieve a fixed connection. The two lower embedded steel plates 742 also require overlapping steel plates 745 for splicing and welding fixation. The upper overlapping steel plate 745 has a stress hole 746 in the middle, so that in the event of an earthquake, the plate will be damaged first through the stress hole 746 to protect the safety of the precast slab 7. Subsequent repair only requires replacing the overlapping steel plate 745. The lap steel plate 745 is made of high-strength composite material. The upper embedded steel plate 741 and the lower embedded steel plate 742 are connected by four embedded connecting ribs 743, and then connected to the precast slab 7 by four horizontally set embedded connecting ribs 743.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. Fully prefabricated steel truss-concrete composite floor system for the building, including: There are four steel pipe columns, arranged in a rectangular pattern. There are four main beams located in the same plane, each connected between two adjacent steel pipe columns; Its characteristic is that it further includes: The main beam includes an upper beam plate and a lower beam plate arranged in parallel. The upper beam plate and the lower beam plate are connected by two layers of web plates to form a box girder structure. Multiple ribs are arranged at intervals along the length of the upper beam plate and the lower beam plate. The surface of the rib plate is perpendicular to the length of the upper beam plate. The width of the lower beam plate is greater than the width of the upper beam plate. The steel truss includes multiple main trusses and secondary trusses arranged laterally and longitudinally. The main trusses and secondary trusses are vertically connected to form multiple rectangular grids. Both the main trusses and secondary trusses include parallel upper chords and lower chords. The ends of the upper chords and lower chords are connected by vertical web members, and the upper chords and lower chords are connected by diagonal web members. The lower ends of the main trusses and secondary trusses overlap the lower beam plate and are connected by bolts at the overlap. The vertical web members and ribs are connected by L-shaped plates and bolts. Shear studs are spaced apart on the upper beam plate and upper chord. The precast slab consists of multiple pieces, each with embedded reinforcing bars at both ends. The two ends of the precast slab are supported on the upper beam of a pair of main beams by the embedded reinforcing bars, and the embedded reinforcing bars and the shear studs on the upper beam are covered by post-cast concrete. The precast slab has reserved connection holes corresponding to the shear studs on the upper chord. The connection between the precast slab and the steel truss is achieved by post-casting concrete into the reserved connection holes. The upper chord of the steel truss is in contact with the lower surface of the precast slab.

2. The fully prefabricated steel truss-concrete composite floor slab for a building warehouse according to claim 1, characterized in that, The upper surface of the upper chord is flush with the upper surface of the upper beam plate.

3. The fully prefabricated steel truss-concrete composite floor slab for a building warehouse according to claim 1, characterized in that, The length of the upper chord of the main truss is the same as the distance between the two corresponding main beams, and the length of the lower chord of the main truss is greater than the distance between the two corresponding main beams. The lengths of the upper and lower chords of the secondary truss are the same as the distance between the two adjacent main trusses they are in contact with.

4. The fully prefabricated steel truss-concrete composite floor slab for a building warehouse according to claim 3, characterized in that, The upper and lower chords of the main truss are vertically connected to the corresponding connection points of the secondary truss. The upper and lower chords of the secondary truss are respectively connected to the corresponding connectors, and the upper and lower chords of the secondary truss are connected to the corresponding connectors by lap plates and bolts.

5. The fully prefabricated steel truss-concrete composite floor slab for a building warehouse according to claim 1, characterized in that, The web is a corrugated web.

6. The fully prefabricated steel truss-concrete composite floor slab for a building warehouse according to claim 1, characterized in that, The cross-sections of the top chord, bottom chord, vertical web members, and diagonal web members of the steel truss are all I-shaped.

7. The fully prefabricated steel truss-concrete composite floor slab for a building warehouse according to claim 1, characterized in that, The reserved connection holes include cross holes and straight holes, with the cross holes corresponding to the connection between the main truss and the secondary truss.

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