A prestressed composite hollow floor slab made of steel tube truss

Abstract

The utility model relates to a steel tube truss prestressed composite hollow floor. Concrete is poured inside the floor, and the floor includes a prefabricated bottom plate, a steel truss web, a grouting steel tube upper chord, a hollow inner mold, a rib beam and a steel mold. The steel truss web is arranged on the prefabricated bottom plate, and a grouting steel tube upper chord is arranged on the top; the bottom steel bar of the plate is perpendicular to the steel truss web; the prestressed tendons are arranged in the prefabricated bottom plate along the length direction, and the distribution tendons are arranged in the prefabricated bottom plate along the width direction; the hollow inner mold and the rib beam are arranged in an array on the prefabricated bottom plate. Compared with the prior art, the bottom plate of the utility model is fully prefabricated, which not only conforms to the architectural aesthetics but also reduces the painting or ceiling process, greatly improving the economic efficiency. The use of prestressed tendons and grouting steel pipes with excellent compressive performance not only increases the span of the floor, but also increases the bearing capacity and crack resistance of the floor, greatly reduces the number of scaffoldings, and further improves the construction speed and efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated assembled structures, in particular to a steel tube truss prestressed composite hollow floor slab. Background Art

[0002] With the admiration of architectural structural expression in recent years, the exposure of large-span hollow slabs without decorative layers has become more and more common. It not only brings more powerful expression to the building, but also saves the cost of decorative layers and suspended top layers, which is in line with the low-carbon green architectural concept. With the vigorous development of prefabricated buildings in recent years, the design and construction technology of prefabricated structures have been continuously developed and updated. The traditional cast-in-place concrete hollow floor can be replaced with reinforced concrete composite hollow floor. Because its architectural effect and flatness are better than traditional hollow floor projects, it can also greatly reduce on-site pouring, effectively improve the level of building industrialization and increase construction speed. At the same time, the use of hollow floor can eliminate the setting of secondary beams and increase the indoor net height. The currently commonly used reinforced concrete composite hollow floor construction method mostly uses ordinary composite slabs for the bottom slab, and ordinary stress-bearing steel bars with two-way reinforcement are prefabricated at the bottom of the slab. Cast-in-place sections are required to connect the slabs. The amount of wet work on site is large, and the advantages of the prefabricated structure cannot be fully reflected. At the same time, due to the existence of cast-in-place sections, multiple connecting seams will appear on the bottom of the slab after completion, which has a low aesthetic appearance and cannot achieve the effect of completely exposed non-decorative structural layers.

[0003] In addition, due to the low rigidity of ordinary composite floor slabs, a large number of scaffoldings are still required during the construction process. The construction measures have no obvious advantages over the original cast-in-place structure, cannot effectively reduce the construction measures costs, and fail to well reflect the advantages of the prefabricated structure in terms of speed, efficiency and economy.

[0004] Therefore, there is an urgent need to study a composite floor that can reduce the setting of scaffolding and improve construction speed and efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a steel tube truss prestressed composite hollow floor in order to overcome the defects of the above-mentioned prior art. By using prestressed tendons instead of ordinary steel bars in the prefabricated bottom plate, and using grouting steel pipes with excellent compressive performance as the upper chord of the grouting steel pipe, the overall performance of the prefabricated bottom plate can be greatly improved, which not only increases the span of the floor plate, but also increases the bearing capacity and crack resistance of the floor plate. In the construction process, the number of scaffoldings can be greatly reduced, and the cost of measures can be greatly reduced.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] The utility model provides a steel tube truss prestressed composite hollow floor slab, concrete is poured in the floor slab, and the floor slab comprises a prefabricated bottom plate, a steel truss web member, a grouting steel tube upper chord, a hollow inner mold, a rib beam and a steel mold group;

[0008] The steel truss web is arranged on the prefabricated bottom plate, and the top of the steel truss web is provided with a grouting steel pipe upper chord;

[0009] The steel bar module includes prestressed bars, distribution bars, slab bottom steel bars and slab top steel bars;

[0010] The prefabricated bottom plate is arranged at both ends of the concrete frame beam, the bottom plate steel bars are arranged on the prefabricated bottom plate, and the bottom plate steel bars are perpendicular to the web bars of the steel bar truss; the prestressed bars are arranged in the prefabricated bottom plate along the length direction, and the distribution bars are arranged in the prefabricated bottom plate along the width direction;

[0011] The hollow inner formwork and the rib beams are arranged in an array on the prefabricated bottom plate, and the top plate reinforcement is arranged on the hollow inner formwork.

[0012] Furthermore, the interval between every two prestressed tendons is 100 mm, and both ends of the prestressed tendons extend out of the prefabricated bottom plate, so as to anchor the prefabricated bottom plate to the concrete frame beam.

[0013] Furthermore, the interval between every two distribution ribs is 300 mm, and the interval between the distribution ribs at both ends of the prefabricated bottom plate is 50 mm.

[0014] Furthermore, a truss hanging point is provided on the upper chord of the grouting steel pipe, and the interval between every two truss hanging points is 3 meters, which are used to hang the prefabricated base plate.

[0015] Furthermore, the grouting steel pipe upper chord is a steel pipe with grouting grout, and the grouting grout is C60 concrete.

[0016] Furthermore, the rib beam includes rib beam top reinforcement, rib beam stirrups and rib beam bottom reinforcement;

[0017] The rib beam top reinforcement is parallel to the rib beam of the steel truss web member, and two rib beam top reinforcements are provided on each rib beam;

[0018] The top reinforcement and bottom reinforcement of the rib beam are perpendicular to the rib beam of the web member of the steel truss, and each rib beam is provided with two top reinforcements and two bottom reinforcements.

[0019] Furthermore, the rib beam stirrups are arranged around the rib beam top reinforcement and the rib beam bottom reinforcement, and the rib beam stirrups are used to improve the overall stiffness of the hollow floor slab.

[0020] Furthermore, a plurality of the prefabricated bottom plates are connected in a close-fitting manner.

[0021] Furthermore, the interval between every two of the hollow inner molds is 200 mm, the rib beam is arranged in the interval, and the hollow inner mold is an extruded polystyrene foam block.

[0022] Furthermore, the thickness of the steel tube truss prestressed composite hollow floor slab is 250 mm.

[0023] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0024] 1. The prefabricated bottom plate of the composite hollow floor in the utility model only extends prestressed tendons in the length direction, and no prestressed tendons extend in the width direction, so that only one joint with good aesthetics is left between the plates; at the same time, since there is no cast-in-place section, after the construction is completed, there is no sensory difference between cast-in-place and prefabrication on the bottom of the plate, and the aesthetics is good. In addition, the bottom of the plate is fully prefabricated, and the overall flatness and aesthetics can meet the requirements of no decorative layer, which not only meets the architectural aesthetics but also reduces the painting or ceiling process, greatly improving the economic efficiency.

[0025] 2. The prefabricated base plate in the utility model adopts prestressed tendons instead of ordinary steel bars, and the upper chord of the grouting steel pipe adopts the grouting steel pipe with excellent compressive performance, so that the overall performance of the prefabricated base plate can be greatly improved, which not only increases the span of the floor plate, but also increases the bearing capacity and crack resistance of the floor plate. In the construction process, the number of scaffoldings can be greatly reduced, the cost of measures can be greatly reduced, and the construction speed and efficiency can be further improved, which is in line with the concept of industrialization of building components. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the steel bar truss web member and the grouting steel pipe upper chord member in Example 1;

[0027] Figure 2 This is a schematic front view of the prestressed bottom plate of the steel tube truss in Example 1;

[0028] Figure 3 This is a schematic diagram of the connection between the prefabricated bottom plate and the concrete beam in Example 1;

[0029] Figure 4 This is a schematic plan view of a prestressed composite hollow floor slab made of steel tube trusses in Example 1;

[0030] Figure 5 Schematic diagram of the cross section in the width direction of the prestressed composite hollow floor slab of the steel tube truss in Example 1;

[0031] Figure 6 It is a schematic cross-sectional diagram of the steel tube truss prestressed composite hollow floor in the length direction in Example 1.

[0032] Figure 1 Description of the mark in:

[0033] 21-reinforced truss web member, 22-grouting steel pipe upper chord member;

[0034] Figure 2 Description of the mark in:

[0035] 1-prefabricated bottom plate, 21-reinforced truss web, 22-grouting steel pipe upper chord, 23-prestressed tendons, 24-distribution tendons;

[0036] Figure 3 Description of the mark in:

[0037] 1-precast bottom plate, 4-rib beam, 5-hollow inner formwork, 6-concrete frame beam, 21-reinforced truss web member, 22-grouting steel pipe upper chord, 23-prestressed tendons, 24-distribution tendons, 25-truss hanging point, 31-slab top reinforcement, 32-slab bottom reinforcement;

[0038] Figure 4 Description of the mark in:

[0039] 1-precast bottom plate, 4-rib beam, 5-hollow inner formwork, 6-concrete frame beam, 21-reinforced truss web member, 22-grouting steel pipe upper chord, 25-truss hanging point;

[0040] Figure 5 Description of the mark in:

[0041] 1-prefabricated bottom plate, 5-hollow inner formwork, 21-reinforced truss web, 22-grouting steel pipe upper chord, 31-slab top reinforcement, 41-rib beam top reinforcement;

[0042] Figure 6 Description of the mark in:

[0043] 1- precast bottom plate, 5- hollow inner formwork, 31- plate top reinforcement, 41- rib top reinforcement, 42- rib stirrups, 43- rib bottom reinforcement. DETAILED DESCRIPTION

[0044] The specific implementation methods of the utility model are described in detail below through examples. These examples are implemented on the premise of the scheme described in the utility model, and provide detailed implementation methods and specific operating processes, but the protection scope of the utility model is not limited to the following examples.

[0045] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Any features such as component models, material names, connection structures, preparation methods, materials, structures or composition ratios not clearly described in this technical solution are deemed to be common technical features disclosed in the prior art.

[0046] Example 1

[0047] This embodiment provides a steel tube truss prestressed composite hollow floor slab, in which C40 concrete is poured. Figure 1 and Figure 2 As shown, it includes a prefabricated bottom plate 1, a steel truss web member 21, a grouting steel pipe upper chord 22, a hollow inner mold 5, a rib beam 4 and steel bars. The steel bars include prestressed bars 23, distribution bars 24, bottom stress steel bars and top stress steel bars.

[0048] The thickness of the precast base plate 1 is 50mm, and the concrete strength grade is C40; prestressed tendons 23 are arranged along the length direction of the precast base plate 1, and the interval between each two prestressed tendons 23 is 100mm, and both ends of the precast base plate 1 extend out of the precast base plate 1, and are used to anchor the precast base plate 1 to the concrete frame beam 6. The prestressed tendons 23 are stress-relieving spiral rib steel wires, and the standard value of their tensile strength is 1570N / mm 2 , with a diameter of 7.0mm. The prestressed tendons 23 can effectively improve the rigidity of the floor during the construction stage, greatly reduce the setting of temporary supports during the construction stage, have obvious economic benefits, and can also effectively control cracks in the floor. The prefabricated bottom plate 1 is provided with distribution ribs 24 along the width direction, and the interval between each two distribution ribs 24 is 300mm. The interval between the distribution ribs 24 at both ends of the prefabricated bottom plate 1 is 50mm. The distribution ribs 24 are hot-rolled round steel bars HRB300 with a diameter of 6mm. Figure 3 As shown, the prefabricated bottom plates are arranged at both ends of the concrete frame beam 6, and the length of the prefabricated bottom plates placed on the concrete frame beam 6 is 40 mm. Multiple prefabricated bottom plates are arranged in a close-fitting manner, and the bottom stress-bearing steel bars are laid in a direction perpendicular to the steel truss web 21. The bottom stress-bearing steel bars are of model HRB400, with a diameter of 12 mm and a laying interval of 150 mm.

[0049] The steel truss web 21 is arranged on the prefabricated bottom plate 1, and a grouting steel pipe upper chord 22 is arranged at the top of the steel truss web 21. The steel truss web 21 is a hot-rolled smooth round steel bar HRB300, with a diameter of 6mm and a web height of 187mm; the grouting steel pipe upper chord 22 is specifically a steel pipe with a diameter of 28mm, a wall thickness of 1mm, and a strength of Q235. The upper chord of the steel truss is formed after C60 slurry is poured inside. Its compressive strength far exceeds the upper chord of the steel truss of the ordinary composite plate. The grouting steel pipe upper chord 22 is provided with a truss hanging point 25, and the interval between every two truss hanging points 25 is 3 meters, which is used to hang the prefabricated bottom plate 1.

[0050] like Figure 4As shown, the hollow inner mold 5 and the rib beam 4 are arranged in an array on the prefabricated base plate 1. The hollow inner mold 5 is an extruded polystyrene foam block with dimensions of 450×450×130mm and 175×450×130mm. It is arranged on the prefabricated base plate 1 at a net distance of 200mm, so that an area with a width of 200mm and a height of 250mm is formed between the hollow inner molds 5. A hollow space can be formed after the floor slab is poured to reduce the deadweight of the floor slab, and is used to arrange the rib beam 4. The width of the rib beam 4 is 200mm. The rib beam 4 includes a rib beam top reinforcement 41, a rib beam stirrup 42 and a rib beam bottom reinforcement 43, which can improve the overall stiffness of the hollow floor slab. The rib beam stirrup 42 is arranged around the rib beam top reinforcement 41 and the rib beam bottom reinforcement 43, as shown in FIG. Figure 5 and Figure 6 As shown. The rib beam 4 parallel to the steel truss web 21 is provided with a rib beam top reinforcement 41, and each rib beam 4 is provided with two rib beam top reinforcements 41, which are HRB400 steel bars with a diameter of 14 mm. The rib beam 4 perpendicular to the steel truss web 21 is provided with a rib beam top reinforcement 41 and a rib beam bottom reinforcement 43, and each rib beam 4 is provided with two top reinforcements 41 and two bottom reinforcements 43. The rib beam top reinforcement 41 is HRB400 steel bars with a diameter of 14 mm, and the rib beam bottom reinforcement 43 is HRB400 steel bars with a diameter of 16 mm. Rib beam stirrups 42 are provided in each rib beam 4, which are HRB400 steel bars with a diameter of 6 mm, and are provided along the rib beam 4 at intervals of 200 mm. After the rib beam reinforcement is provided, the plate top reinforcement 31 is provided above the hollow inner mold 5, which is a bidirectional HRB400 steel mesh with a diameter of 12 mm and a spacing of 150 mm.

[0051] The above description of the embodiments is to facilitate the understanding and use of the utility model by those skilled in the art. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the scope of protection of the utility model.

Claims

1. A steel tube truss prestressed composite hollow floor slab, wherein concrete is poured inside the floor slab, characterized in that: The floor slab comprises a prefabricated bottom slab (1), a steel truss web member (21), a grouting steel pipe upper chord member (22), a hollow inner mold (5), a rib beam (4) and a steel mold group; The steel truss web member (21) is arranged on the prefabricated bottom plate (1), and a grouting steel pipe upper chord (22) is arranged at the top of the steel truss web member (21); The steel bar module comprises prestressed bars (23), distribution bars (24), slab bottom steel bars (32) and slab top steel bars (31); The prefabricated bottom plate (1) is arranged at both ends of the concrete frame beam (6); the bottom plate steel bars (32) are arranged on the prefabricated bottom plate (1); the bottom plate steel bars (32) are perpendicular to the steel truss web (21); the prestressed tendons (23) are arranged in the prefabricated bottom plate (1) along the length direction; and the distribution bars (24) are arranged in the prefabricated bottom plate (1) along the width direction; The hollow inner formwork (5) and the rib beams (4) are arranged in an array on the prefabricated bottom plate (1), and the plate top reinforcement (31) is arranged on the hollow inner formwork (5).

2. The steel tube truss prestressed composite hollow floor slab according to claim 1, characterized in that: The interval between each two prestressed tendons (23) is 100 mm, and both ends of the prestressed tendons (23) extend out of the prefabricated bottom plate (1) to anchor the prefabricated bottom plate (1) to the concrete frame beam (6).

3. The steel tube truss prestressed composite hollow floor slab according to claim 1, characterized in that: The interval between each two distribution ribs (24) is 300 mm, and the interval between the distribution ribs (24) at both ends of the prefabricated bottom plate (1) is 50 mm.

4. The steel tube truss prestressed composite hollow floor slab according to claim 1, characterized in that: The grouting steel pipe upper chord (22) is provided with a truss hanging point (25), and the interval between every two truss hanging points (25) is 3 meters, which are used to hang the prefabricated bottom plate (1).

5. The steel tube truss prestressed composite hollow floor slab according to claim 4, characterized in that: The grouting steel pipe upper chord (22) is a steel pipe with grouting grout, and the grouting grout is C60 concrete.

6. The steel tube truss prestressed composite hollow floor slab according to claim 1, characterized in that: The rib beam (4) comprises a rib beam top rib reinforcement (41), a rib beam stirrup (42) and a rib beam bottom rib reinforcement (43); The rib beam top reinforcement (41) is parallel to the rib beam (4) of the steel truss web member (21), and two rib beam top reinforcements (41) are provided on each rib beam (4); The rib beam top reinforcement (41) and the rib beam bottom reinforcement (43) are both perpendicular to the rib beam (4) of the steel truss web member (21), and each rib beam (4) is provided with two top reinforcements (41) and two bottom reinforcements (43).

7. The steel tube truss prestressed composite hollow floor slab according to claim 6, characterized in that: The rib beam stirrups (42) are arranged around the rib beam top reinforcement (41) and the rib beam bottom reinforcement (43), and the rib beam stirrups (42) are used to improve the overall rigidity of the hollow floor slab.

8. The steel tube truss prestressed composite hollow floor slab according to claim 1, characterized in that: A plurality of the prefabricated bottom plates (1) are connected in a close-fitting manner.

9. The steel tube truss prestressed composite hollow floor slab according to claim 1, characterized in that: The interval between each two hollow inner molds (5) is 200 mm, the rib beam (4) is arranged in the interval, and the hollow inner mold (5) is an extruded polystyrene foam block.

10. The steel tube truss prestressed composite hollow floor slab according to claim 1, characterized in that: The thickness of the steel tube truss prestressed composite hollow floor slab is 250mm.

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