Roof low-clearance large-span air shaft top plate support-free sealing system
By adopting a semi-prefabricated + semi-cast-in-place construction method in the low-headroom, large-span ventilation shaft on the roof, and using concrete partition columns and prefabricated floor deck connecting beams to form an unsupported closed system, the problems of difficult construction and insufficient ventilation were solved, making construction more convenient and reducing costs, while ensuring the ventilation effect of the ventilation shaft.
Patent Information
- Application Number
- CN202422701981.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-11-06
AI Technical Summary
In rooftop ventilation shafts with low headroom and large spans, traditional construction methods have the problems of high construction difficulty, material waste, and reduced ventilation volume. Especially in large-span structures, it is difficult to remove the formwork of cast-in-place concrete structures, which affects the ventilation effect.
A semi-prefabricated + semi-cast-in-place construction mode is adopted. By setting concrete separation columns and prefabricated floor deck connecting beams on the concrete top plate, an unsupported closed system is formed. The prefabricated floor deck connecting beams are used as supporting beams, and the prefabricated floor decks are gradually laid to form a stable load-bearing structure.
It has achieved convenient construction, shortened construction period, reduced costs, ensured the ventilation volume and use function of the air shaft, and solved the construction difficulties of large-span air shafts.
Smart Images
Figure CN223330170U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ventilation shaft construction, in particular to a rooftop low-headroom and large-span ventilation shaft top plate unsupported closed system. Background Art
[0002] In modern architectural design, in order to meet the needs of functionality and aesthetics, large-span structures often appear, especially when the roof structure contains low-headroom cavity air shafts. This type of structure places high demands on construction technology, which must not only ensure the stability of the structure but also take into account the safety and economy of the construction.
[0003] The top of the traditional cavity air shaft adopts cast-in-place concrete structure. The formwork system can only be removed after the concrete reaches a certain strength. If the clearance of the cavity air shaft is only 40cm-70cm, the construction workers cannot carry out construction in the narrow space. Failure to remove the formwork system will not only affect the function of the ventilation shaft, but also cause waste of materials.
[0004] In order to solve the problem of construction of air shafts in low-headroom cavities on the roof, the floor decking is cast in one go for small-span cavities. However, in order to solve the support problem of large-span floor decking, the traditional method is to set concrete structural beams in the cavity as the support of the large-span floor decking. However, this method will affect the ventilation volume of the air shaft due to the horizontal components. Summary of the Invention
[0005] In view of the above-mentioned prior art, the present invention proposes a support-free closed system for a roof with low headroom and large span of an air shaft top plate.
[0006] The utility model provides a low-headroom, large-span, unsupported closed system for a rooftop air shaft top plate, comprising a rooftop concrete top plate, wherein a plurality of concrete dividing columns are provided at the upper end of the rooftop concrete top plate, and a prefabricated floor deck connecting beam is provided on the top of the plurality of concrete dividing columns, wherein the top end of the prefabricated floor deck connecting beam and the top end of the concrete dividing column are located at the same elevation, and the upper end of the prefabricated floor deck connecting beam is provided with a cast-in-place concrete top plate.
[0007] Preferably, the specification of the concrete partition column is 200mm×200mm.
[0008] Preferably, the prefabricated floor deck connecting beam adopts a single hollow inverted type, including 1 upper chord steel bar and 2 lower chord steel bars, the upper chord steel bar and the lower chord steel bar are connected by several web bars, and the bottom of the lower chord steel bar is provided with a galvanized steel plate.
[0009] Preferably, a prefabricated floor deck is provided inside the cast-in-place concrete top slab.
[0010] Compared with the existing technology, the beneficial effects of the present invention are as follows: the present invention proposes a low-headroom, large-span, unsupported closed system for the rooftop air shaft, which adopts a semi-prefabricated + semi-cast-in-place mode, is convenient to construct, shortens the construction period, and has a safe and stable force system, which can reduce the construction difficulty and project cost, while meeting the ventilation volume of the air shaft and ensuring the use function of the cavity air shaft. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic elevation view of an unsupported closed system of a roof with low headroom and large span of an air shaft top plate in an embodiment of the present utility model.
[0012] Figure 2 It is a plan view of the unsupported closed system of the roof with low clearance and large span of the air shaft top plate in the embodiment of the present utility model.
[0013] In the figure, 1. Roof concrete top plate; 2. Cavity air shaft; 3. Concrete partition column; 4. Prefabricated floor deck connecting beam; 5. Prefabricated floor deck; 6. Concrete top plate. DETAILED DESCRIPTION
[0014] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.
[0015] Example: Figure 1-Figure 2 As shown, a roof low-headroom, large-span air shaft top plate unsupported closed system includes a roof concrete top plate 1, which serves as the bottom structural plate of the cavity air shaft 2.
[0016] Furthermore, nine evenly distributed 200mm×200mm concrete partition columns 3 are provided at the upper end of the roof concrete top plate 1 , which serve as vertical supports for the top structural plate of the cavity air shaft 2 .
[0017] Furthermore, a prefabricated floor deck connecting beam 4 is provided on the top of the concrete dividing column 3. The prefabricated floor deck connecting beam 4 adopts a single hollow inverted type, including 1 upper chord steel bar and 2 lower chord steel bars. The upper chord steel bar and the lower chord steel bar are connected by several web bars. The bottom of the lower chord steel bar is provided with a galvanized steel plate. The steel bars of the prefabricated floor deck connecting beam 4 are anchored into the concrete dividing column 3. The top of the prefabricated floor deck connecting beam 4 and the top of the concrete dividing column 3 are at the same elevation. The prefabricated floor deck connecting beam 4 serves as a support beam for the prefabricated floor deck 5 at the top of the cavity air shaft 2.
[0018] Furthermore, the prefabricated floor decking 5 is laid from one end to the other end according to the design drawing to ensure the continuity and stability of the prefabricated floor decking 5. After the prefabricated floor decking 5 is laid according to the drawing, a support-free system is formed, and a cast-in-place concrete top plate 6 is formed to form a closed cavity air shaft 2.
[0019] The system of this embodiment satisfies the ventilation volume of the air shaft while ensuring safety, thereby ensuring the functional use of the cavity air shaft.
[0020] The above is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent scheme made using the contents of the present invention specification, directly or indirectly used in other related technical fields, is also within the patent protection scope of the present invention.
Claims
1. A rooftop low headroom and large span air shaft top plate unsupported closed system, characterized in that: It includes a roof concrete top plate, a plurality of concrete dividing columns are provided at the upper end of the roof concrete top plate, a prefabricated floor deck connecting beam is provided on the top of the plurality of concrete dividing columns, the top of the prefabricated floor deck connecting beam and the top of the concrete dividing column are located at the same elevation, and the upper end of the prefabricated floor deck connecting beam is provided with a cast-in-place concrete top plate.
2. The low-headroom, large-span, unsupported closed roof system for ventilation shafts according to claim 1, characterized in that: The specification of the concrete dividing column is 200mm×200mm.
3. The low-headroom, large-span, unsupported closed roof system for ventilation shafts according to claim 1 or 2, characterized in that: The prefabricated floor deck connecting beam adopts a single hollow inverted type, including 1 upper chord steel bar and 2 lower chord steel bars. The upper chord steel bar and the lower chord steel bar are connected by several web bars, and a galvanized steel plate is provided at the bottom of the lower chord steel bar.
4. The low-headroom, large-span, unsupported closed roof system for ventilation shafts according to claim 1 or 2, characterized in that: A prefabricated floor deck is arranged inside the cast-in-place concrete top slab.