Method of constructing concrete vent duct

Abstract

The application relates to the technical field of building construction, in particular to a construction method of a concrete ventilation pipeline. The use of a galvanized steel plate air pipe is cancelled, the outer thermal insulation layer of the air pipe is moved to the outside of the concrete pipeline, the strength and rigidity of the concrete are used as the ventilation pipeline, high-density polyethylene plates are used for thermal insulation treatment, the outermost side is used for waterproofing by using a waterproof film, the inside is sealed to ensure the tightness of the ventilation pipeline, the construction method is simple, the specialty is single, the construction cost is low, and the construction period is short.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically a construction method for concrete ventilation ducts. Background Technology

[0002] In the design and construction of large venues, to save building area and increase usable space, equipment rooms such as air conditioning rooms (refrigeration rooms) are often located separately outside the venue and connected to the venue's air conditioning and ventilation system via ventilation ducts. However, fire lanes are required around the venue, so the pipes connecting the venue and the air conditioning rooms need to avoid these fire lanes. There are two design options: one is to allow the pipes to pass overhead, at an elevation ≥4.5m above the fire lane; the other is to bury them underground, passing beneath the fire lane. However, since these pipes provide air conditioning and ventilation for the main space of the venue, they have a large cross-sectional area and are numerous. Passing them above the fire lane would affect the overall aesthetics and layout of the building. Therefore, burying them underground is generally preferred. Underground installations typically involve constructing a pipe gallery, through which the pipes pass, connecting the equipment rooms and the main venue.

[0003] Currently, traditional buried ventilation ducts mostly use galvanized steel ducts protected by a reinforced concrete corridor. This method has two construction approaches: one is to first construct the galvanized steel ducts, then insulate them, and finally protect them with a reinforced concrete corridor. This method is complex, requires multidisciplinary cooperation, is difficult to construct, has high costs, and a long construction period. The other approach is to first construct the concrete corridor, and then install the galvanized steel ducts inside the corridor, with an external insulation layer. This method requires a larger reinforced concrete corridor cross-section to allow construction workers to enter and work inside, resulting in high costs and greater difficulty. Summary of the Invention

[0004] The present invention aims to solve the above problems, thereby providing a construction method for concrete ventilation ducts that is simple to construct.

[0005] The technical solution adopted by the present invention to solve the aforementioned problem is as follows:

[0006] A construction method for concrete ventilation ducts includes the following steps:

[0007] S1: Level and compact the construction site to bring it up to the design elevation.

[0008] S2: Pour plain concrete on the construction site as a pipe bedding layer, and then polish it after pouring.

[0009] S3: Lay a waterproof membrane on the pipe underlayment. The width of the waterproof membrane is greater than the width of the pipe underlayment. Extend the waterproof membrane beyond the pipe underlayment and fold it back on both sides. Lay a bottom high-density polyethylene board on the waterproof membrane. The width of the waterproof membrane is the perimeter of the ventilation duct + the thickness of the high-density polyethylene board × 4 + the overlap length of the waterproof membrane. The width of the bottom high-density polyethylene board is the width of the ventilation duct bottom plate + the thickness of the high-density polyethylene board × 2.

[0010] S4: Cast ventilation ducts on the bottom high-density polyethylene board.

[0011] S5: After the ventilation duct construction is completed, install side high-density polyethylene panels on the bottom high-density polyethylene panel and on both sides of the ventilation duct. Install top high-density polyethylene panel on the top surface of the ventilation duct, with the two sides of the top high-density polyethylene panel overlapping the side high-density polyethylene panels.

[0012] S6: Unfold both sides of the waterproof membrane and wrap the ventilation duct with high-density polyethylene sheets.

[0013] S7: Perform earthwork backfilling, using fine sand to backfill around the waterproof membrane.

[0014] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art:

[0015] The use of galvanized steel sheet ducts has been eliminated. Instead, the external insulation layer of the ducts is moved to the outside of the concrete pipes, utilizing the strength and rigidity of the concrete itself as the ventilation duct. High-density polyethylene boards are then used for thermal insulation, and a waterproof membrane is applied to the outermost side for waterproofing. The inside is sealed to ensure the airtightness of the ventilation duct. The construction method is simple, requires only one professional expertise, has low construction costs, and a short construction period.

[0016] As a preferred embodiment, a further technical solution of the present invention is:

[0017] The width of the duct underlayment is greater than the width of the ventilation duct base plate plus the thickness of the high-density polyethylene board × 2 plus the thickness of the waterproof membrane × 2.

[0018] The waterproof membrane consists of multiple PVC membranes arranged along the length of the pipe liner. Each PVC membrane is wrapped with a high-density polyethylene board and then overlapped and closed on the top surface. Adjacent PVC membranes overlap each other, and the overlapped parts are bonded with waterproof adhesive.

[0019] The overlap width is ≥5mm;

[0020] The distance between the axes of adjacent PVC membranes along the length of the pipe underlayment is ≥150mm.

[0021] The thickness of the fine sand backfill should be ≥100mm. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present invention;

[0023] The following are labeled in the diagram: 1. Pipe underlayment; 2. Waterproof membrane; 3. Bottom high-density polyethylene board; 4. Side high-density polyethylene board; 5. Top high-density polyethylene board; 6. Ventilation duct. Detailed Implementation

[0024] The present invention will be further described below with reference to embodiments, which are intended only to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0025] A construction method for concrete ventilation ducts includes the following steps:

[0026] S1: Level and compact the construction site to bring it up to the design elevation.

[0027] S2: Pour plain concrete on the construction site as pipe bedding layer 1. The width of pipe bedding layer 1 is greater than the width of the base plate of ventilation duct 6 + the thickness of high-density polyethylene board × 2 + the thickness of waterproof membrane 2 × 2. After pouring, smooth the concrete. There should be no sharp objects or protrusions and depressions to avoid damaging the waterproof membrane 2.

[0028] S3: Lay a waterproof membrane 2 on the pipe pad 1. The width of the waterproof membrane 2 is greater than the width of the pipe pad 1. Extend the waterproof membrane 2 beyond both sides of the pipe pad 1 and then roll it up. Lay a bottom high-density polyethylene board 3 on the waterproof membrane 2. The axis of the bottom high-density polyethylene board 3 along the length direction coincides with the axis of the ventilation duct 6 along the length direction. The width of the waterproof membrane 2 is the perimeter of the ventilation duct 6 + the thickness of the high-density polyethylene board × 4 + the overlap length of the waterproof membrane 2. The width of the bottom high-density polyethylene board 3 is the width of the bottom plate of the ventilation duct 6 + the thickness of the high-density polyethylene board × 2. The waterproof membrane 2 includes multiple PVC membranes set along the length direction of the pipe pad 1. Each PVC membrane wraps the high-density polyethylene board and then overlaps and closes on the top surface. Adjacent PVC membranes overlap and are bonded with waterproof adhesive. The overlap width is ≥ 5 mm. The distance between the axes of adjacent PVC membranes along the length direction of the pipe pad 1 is ≥ 150 mm. Each PVC membrane forms an interface after overlapping and closing on the top surface. The adjacent interfaces are staggered to prevent leakage caused by interfaces being on the same line.

[0029] S4: Cast reinforced concrete ventilation ducts 6 on the bottom high-density polyethylene board 3.

[0030] S5: After the ventilation duct 6 is constructed, side high-density polyethylene panels 4 are installed on the bottom high-density polyethylene panel 1 and on both sides of the ventilation duct 6. Top high-density polyethylene panel 5 is installed on the top surface of the ventilation duct 6. The two sides of the top high-density polyethylene panel 5 overlap the side high-density polyethylene panels 4. The ventilation duct 6 is wrapped with high-density polyethylene panels for insulation.

[0031] S6: Unfold both sides of the waterproof membrane 2 and wrap the ventilation duct 6 with high-density polyethylene sheet.

[0032] S7: Perform earthwork backfilling. Use fine sand to backfill around the waterproof membrane 2. The thickness of the fine sand backfill should be ≥100mm.

[0033] The inventors conducted calculations and experiments using ventilation ducts of different materials. After verification, they found that the optimal solution, which was the lowest cost, fastest construction period, easiest construction, and met design requirements, was to cover the concrete ventilation ducts with external insulation material. However, this process required addressing the waterproofing and moisture-proofing issues of the concrete ventilation ducts. Therefore, a PVC membrane was used for the outermost layer, solving the problems of high construction difficulty, high project cost, and long construction period.

[0034] The use of galvanized steel sheet ducts has been eliminated. Instead, the external insulation layer of the ducts is moved to the outside of the concrete pipes, utilizing the strength and rigidity of the concrete itself as the ventilation duct. High-density polyethylene boards are then used for thermal insulation, and a waterproof membrane is applied to the outermost side for waterproofing. The inside is sealed to ensure the airtightness of the ventilation duct. The construction method is simple, requires only one professional expertise, has low construction costs, and a short construction period.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A construction method for concrete ventilation ducts, characterized in that: Includes the following steps: S1: Level and compact the construction site to bring it up to the design elevation; S2: Pour plain concrete on the construction site as a pipe bedding layer, and smooth it after pouring; S3: Lay a waterproof membrane on the pipe underlayment. The width of the waterproof membrane is greater than the width of the pipe underlayment. Extend the waterproof membrane beyond the pipe underlayment and then roll it up on both sides. Lay a bottom high-density polyethylene board on the waterproof membrane. The width of the bottom high-density polyethylene board is the width of the ventilation duct bottom plate + the thickness of the high-density polyethylene board × 2. The waterproof membrane includes multiple PVC membranes set along the length of the pipe underlayment. Each PVC membrane wraps around the high-density polyethylene board and then overlaps and closes on the top surface. Adjacent PVC membranes overlap with each other, and the overlap is bonded with waterproof adhesive. The overlap width is ≥ 5mm. The distance between the axes of adjacent PVC membranes along the length of the pipe underlayment is ≥ 150mm. S4: Cast ventilation ducts on the bottom high-density polyethylene board; S5: After the ventilation duct construction is completed, install side high-density polyethylene panels on the bottom high-density polyethylene panel and on both sides of the ventilation duct. Install top high-density polyethylene panel on the top surface of the ventilation duct, with the two sides of the top high-density polyethylene panel overlapping the side high-density polyethylene panels. S6: Unfold both sides of the waterproof membrane and wrap the ventilation duct with high-density polyethylene sheet. S7: Perform earthwork backfilling, using fine sand to backfill around the waterproof membrane.

2. The construction method for concrete ventilation ducts according to claim 1, characterized in that: The width of the duct underlayment is greater than the width of the ventilation duct base plate plus the thickness of the high-density polyethylene board × 2 plus the thickness of the waterproof membrane × 2.

3. The construction method for concrete ventilation ducts according to claim 1, characterized in that: The thickness of the fine sand backfill should be ≥100mm.

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