Hollow composite floor slab and construction method thereof

A technology of superimposing floor slabs and hollow cores, applied in the direction of slabs, building components, buildings, etc., can solve the problems of large amount of formwork, low construction efficiency, poor integrity, etc., to improve crack resistance, construction efficiency, and integrity. Effect

Inactive Publication Date: 2015-05-13
JINAN RAILWAY TRANSPORT GRP CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

Among them, the cast-in-place concrete floor slab has defects such as large amount of formwork, low construction efficiency, and easy cracking. The prefabricated floor slab has defects such as structural integrity and poor seismic performance. The assembled integral floor slab has troublesome construction, poor integrity, and difficult reliability. and other defects
At the same time, b...
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Abstract

The invention discloses a hollow composite floor slab and a construction method of the hollow composite floor slab. The hollow composite floor slab comprises a prefabricated hollow bottom plate and an upper cast-in-place slab, continuous fully-closed preformed holes and semi-closed preformed holes are distributed in the prefabricated hollow bottom plate at intervals, or the continuous fully-closed preformed holes and plate ribs are distributed on the prefabricated hollow bottom plate at intervals, bottom plate rebars are distributed on the prefabricated hollow bottom plate at intervals in the longitudinal direction and the transverse direction, prestress rebars or prestress rebars and non-prestress rebars distributed at intervals are adopted as the bottom plate rebars, and the rebars penetrate through the semi-closed preformed holes or plate rib preformed holes. Concrete is poured on the prefabricated hollow bottom plate to form the upper cast-in-place slab, multiple sets of top rebars are distributed on the cast-in-place slab in the longitudinal and the transverse directions parallel to the bottom plate at intervals, and reinforced concrete is integrally poured on the bottom plate to form the hollow composite floor slab. Only the prefabricated bottom plate needs to be produced and transported, transportation and installation are convenient and fast, formworks are not needed, the crack resistance and the integrity are good, and the construction efficiency is high.

Application Domain

Technology Topic

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  • Hollow composite floor slab and construction method thereof
  • Hollow composite floor slab and construction method thereof
  • Hollow composite floor slab and construction method thereof

Examples

  • Experimental program(3)

Example Embodiment

[0045] Example 1
[0046] Such as figure 1 , figure 2 As shown, a hollow laminated floor slab includes a prefabricated hollow bottom plate 1 and an upper cast-in-place slab 2. The hollow bottom plate 1 is provided with full-length fully enclosed reserved holes 4 and semi-closed reserved holes 3 at intervals. The prefabricated hollow floor 1 The bottom plate steel bars 5 are arranged at intervals along the vertical and horizontal directions. The semi-closed reserved holes 3 are provided with steel bars 6 in the holes. The hollow bottom plate 1 is filled with reinforced concrete to form an upper cast-in-place slab 2. Multiple sets of top steel bars 7 are arranged at intervals in the horizontal direction, and concrete is poured on the hollow bottom plate 1 as a whole to form a hollow laminated floor.
[0047] The floor reinforcement 5 adopts prestressed reinforcement or is arranged at intervals between prestressed reinforcement and non-prestressed reinforcement. The fully enclosed reserved hole 4 adopts a circular cross section, and the fully enclosed reserved hole 4 and the semi-closed reserved hole 3 have the same diameter. A long groove is provided between the open end of the semi-closed reserved hole 3 and the upper surface of the prefabricated hollow bottom plate 1.
[0048] A construction method of the hollow laminated floor slab includes the following steps:
[0049] (1) On the precast hollow bottom plate 1, prestressed steel bars are arranged longitudinally and transversely, or prestressed steel bars and non-prestressed steel bars are arranged at intervals;
[0050] (2) Install the template, stretch the prestressed steel bars in the hollow bottom plate 1, and pour concrete to form the prefabricated hollow bottom plate 1;
[0051] (3) After removing the formwork and curing the reinforced concrete to 85% of the design strength, cut off the excess prestressed steel bars at the ends, and lift the prefabricated hollow bottom plate 1 to the storage place;
[0052] (4) Transport the prefabricated hollow slab 1 to the construction site. After the installation is completed, drill the inner steel bars 6 in the semi-closed reserved holes 3 of the hollow slab 1, and tie the top steel bars 7 of the laminated floor;
[0053] ⑸ Pouring concrete to form a hollow superimposed floor.
[0054] Such as image 3 As shown, the thickness of the laminated board in this embodiment is 120mm, the thickness of the prefabricated hollow bottom plate 1 is 80mm, the radius of the reserved hole 4 is 25mm, the hole spacing is 200mm, and the opening width of the semi-closed hole is 30mm, which is the full length The width of the groove is 30 mm.

Example Embodiment

[0055] Example 2
[0056] Such as Figure 4 , Figure 5 As shown, the opening end of the semi-closed reserved hole 3 in this embodiment is flush with the upper surface of the hollow bottom plate 1, and the diameter of the fully closed reserved hole 4 is smaller than the diameter of the semi-closed reserved hole 3. The other structure is the same as the first embodiment.
[0057] Such as Image 6 As shown, the thickness of the laminated board in this embodiment is 120mm, the thickness of the prefabricated hollow bottom plate 1 is 80mm, the radius of the fully enclosed reserved hole 4 is 25mm, the radius of the semi-closed reserved hole 3 is 35mm, and the hole spacing is 300mm , The distance between the bottom of the reserved hole and the bottom plate is 20mm. The construction method and steps are the same as in Example 1.

Example Embodiment

[0058] Example 3
[0059] Such as Figure 7-11 As shown, a hollow laminated floor slab includes a prefabricated hollow slab 1. The hollow slab 1 is provided with full-length fully enclosed reserved holes at intervals. The prefabricated hollow slab 1 is provided with floor reinforcements 5 longitudinally and transversely. 1 includes multiple groups of plate ribs 9, each group of plate ribs 9 is divided by the cavity of the bottom plate, the bottom of the plate rib 9 is provided with a plate rib reserved hole 10, and the plate rib reserved hole 10 is penetrated with a steel bar 6 in the hole. Concrete is poured on the hollow bottom plate 1 to form the upper cast-in-place slab 2. The upper cast-in-situ slab 2 is provided with multiple sets of top steel bars 7 spaced longitudinally and laterally. The hollow bottom plate 1 is integrally poured with concrete to form a hollow laminated floor.
[0060] The bottom plate reinforcement 5 adopts prestressed steel reinforcement or adopts a spacing arrangement of prestressed steel reinforcement and non-prestressed steel reinforcement.
[0061] The plate rib reserved holes 10 include two groups, which are arranged in parallel at the bottom of each group of plate ribs 9.
[0062] The fully enclosed reserved holes include rectangular holes 8 and circular reserved holes 4, the circular reserved holes 4 are arranged at the end of the hollow bottom plate 1, and the rectangular holes 8 are arranged in parallel with each group of plate ribs 9 at intervals.
[0063] A construction method of the hollow laminated floor slab includes the following steps:
[0064] (1) On the precast hollow bottom plate 1, prestressed steel bars are arranged longitudinally and transversely, or prestressed steel bars and non-prestressed steel bars are arranged at intervals;
[0065] (2) Install the template, stretch the prestressed steel bars of the hollow bottom plate 1, and pour concrete to form the precast hollow bottom plate 1;
[0066] (3) After removing the formwork and curing the reinforced concrete to 85% of the design strength, cut off the excess prestressed steel bars at the ends, and lift the prefabricated hollow bottom plate 1 to the storage place;
[0067] (4) Transport the prefabricated hollow slab to the construction site. After the installation is completed, drill the inner steel bars 6 in the reserved holes 10 of the slab ribs 9 and tie the top steel bars 7 of the laminated floor;
[0068] ⑸ Pouring concrete to form a hollow superimposed floor.
[0069] Such as Picture 12 As shown, the thickness of the laminated board in this embodiment is 120mm, the thickness of the prefabricated ribbed hollow bottom plate 1 is 30mm, the rib width of the rib 9 is 150mm, the rib height is 50mm, the rib spacing is 200mm, and the radius of the rib hole 10 is 15mm. .
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