CN217325497U - Ventilating duct direct-buried construction structure - Google Patents

Abstract

The utility model provides a ventilation pipe direct-burried construction structure, belongs to the house field of ventilating, including the cell body, pour the concrete foundation layer in the cell body, connect the metal spiral duct on the concrete foundation layer, the perpendicular welding is at the branch tuber pipe on the metal spiral duct, set up at the intraductal integrated air valve subassembly of branch tuber pipe and set up the grid at integrative air valve subassembly suitable for reading. The integrated air valve assembly comprises an air valve, a water collecting device and a filtering device, wherein the water collecting device and the filtering device are arranged above the air valve. The utility model provides a current underground ventilation mode is high cost, and the serious problem of leaking out solves simultaneously that there is the corrosion in the underground air duct, and underground air duct content easily gathers a large amount of dust and battings, has conflagration hidden danger, the serious problem of wind gap noise.

Description

Ventilating duct direct-buried construction structure

Technical Field

The utility model belongs to house ventilation field, concretely relates to air pipe direct-burried construction structures.

Background

In the assembly workshop of the automobile factory building, because off-line vehicles need to discharge a large amount of automobile exhaust in the process of passing between the detection lines, the collection and the discharge of the automobile exhaust in the indoor closed area become a difficult problem.

The common practice is to arrange an exhaust system above the factory building, but because the density of the tail gas is relatively heavy and the tail gas is finally exhausted after being mixed with the indoor air, the ventilation efficiency of the method is too low, and indoor pollution is also caused. This problem can be solved if an exhaust device can be provided under the road on which the vehicle travels. The existing solution is to arrange a ventilation trench underground as an air duct for construction, which results in high engineering cost and serious air leakage.

Meanwhile, the prior art also has the following problems:

problem (1) there is the corrosion condition in the underground air duct: the research is mainly that the tail gas of the wind-powered automobile contains a large amount of substances such as nitric oxide, sulfur dioxide and the like, and a small amount of water is generated when the gasoline is completely combusted and is discharged through an exhaust pipe of the automobile; part of tail gas is dissolved in water to be acidic; the air outlet on the ground is mainly used for collecting automobile exhaust, a part of exhaust pipeline discharged liquid of a vehicle enters the air outlet in the off-line running process and the vehicle inspection process, and acid liquid enters the air channel below the air outlet through the air valve due to the fact that the air outlet does not have any water blocking measure, and the inner wall of the air channel below the air outlet is corroded under different conditions; except that the ground of this automobile factory building often adopts epoxy terrace, and it needs to wash and even wash (short time) to maintain the ground clean on ordinary days, consequently always has a small amount of liquid also to get into in the underground air duct, causes the erosion to its inner wall.

The problem (2) that a large amount of dust and lint are easily accumulated in the underground air duct is a serious fire hazard: the air port is arranged on the ground, so that dust and catkins are easy to suck, especially in spring and summer crossing seasons, a large amount of poplar catkins can be sucked to cause a large amount of deposition in underground pipelines, if open fire is met, fire disasters can be caused, and in addition, the air port becomes a sanitary dead angle of a factory.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an air pipe direct-burried construction structure, it is high to solve current underground ventilation mode cost, and the serious problem of leaking out solves the underground air duct simultaneously and has the corrosion, and underground air duct content easily gathers a large amount of dusts and battings, has conflagration hidden danger, the serious problem of wind gap noise.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a direct-buried construction structure of a ventilation pipeline comprises a groove body, a concrete foundation layer poured in the groove body, a metal spiral air pipe connected to the concrete foundation layer, a branch air pipe vertically welded to the metal spiral air pipe, an integrated air valve assembly arranged in the branch air pipe and a grid arranged at the upper opening of the integrated air valve assembly.

The integrated air valve assembly comprises an air valve, a water collecting device and a filtering device, wherein the water collecting device and the filtering device are arranged above the air valve.

The water collecting device comprises a lower water collecting tank arranged in the middle of the branch air pipe and an upper water collecting tank arranged on one side of the branch air pipe; the lower water collecting tank is welded in the middle of the top surface of the air valve, and the cross section of the lower water collecting tank comprises a U-shaped part and an L-shaped part which is bent outwards along two ends of the U-shaped part; the upper water collecting tank is welded on the inner wall of the branch air pipe, and the cross section of the upper water collecting tank comprises an L-shaped section and a vertical part vertically welded on the lower surface of the L-shaped section.

Further preferred technical solution: the filtering device comprises a coarse filter, a lower fixed filter plate clamping sheet and an upper fixed filter plate clamping sheet, wherein the lower fixed filter plate clamping sheet and the upper fixed filter plate clamping sheet are used for fixing the coarse filter; the rotatable lower fixed filter plate clamping piece is connected to the inner side of the lower water collecting tank through a fixing screw, and a lower bayonet is formed between the lower fixed filter plate clamping piece and the L-shaped part of the lower water collecting tank; the rotatable upper fixed filter plate clamping piece is connected to the inner side of the upper water collecting tank through a fixing screw, and an upper bayonet is formed between the upper fixed filter plate clamping piece and the vertical part of the upper water collecting tank; the coarse filter is clamped between the upper bayonet and the lower bayonet.

Further preferred technical solution: the air valve comprises a valve body, a horizontal steel support is arranged in the middle of the valve body, a vertical transmission shaft penetrates through the center of the steel support, a nut penetrates through the transmission shaft, and the nut is positioned on the upper surface of the steel support; the top end of the transmission shaft is provided with a circular hand wheel, the lower part of the transmission shaft is connected with a spring in a penetrating way, and the spring is positioned on the lower surface of the steel support; the bottom end of the transmission shaft is provided with a connecting device, two ends of the connecting device are connected with a first fixed hinged support, and two ends of the first fixed hinged support are connected with a connecting rod; a pair of sides of the inner wall of the valve body are connected with a valve leaf through a second fixed hinge, and the middle part of the valve leaf is connected with a third fixed hinge; the connecting rod is hinged with the third fixed hinge support.

Further preferred technical solution: the transmission shaft penetrates through the lower water collecting tank, and a waterproof gasket is arranged between a nut which is connected to the transmission shaft in a penetrating manner and the upper surface of the lower water collecting tank.

Further preferred technical solution: the upper opening of the valve body is bent outwards to form a clamping edge, and the clamping edge is clamped at the upper opening of the branch air pipe.

Further preferred technical solution: the rubber shock pad sets up between the lower surface of card limit top surface and the grid of valve body.

Further preferred technical solution: the reentrant corner department welding of angle steel has the strengthening rib, and the strengthening rib is connected with the concrete floor.

Further preferred technical solution: the reinforced concrete structure is built at the three-way joint of the metal spiral air pipe, and the corner of the reinforced concrete structure is sleeved with a flexible waterproof sleeve.

Further preferred technical solution: the man-accessible clean well is arranged at one corner of the reinforced concrete structure.

Further preferred technical solution: the accessible clean well comprises a hole arranged at one corner of the reinforced concrete structure, a steel cover plate is arranged at the upper opening of the hole, a hidden cover plate buckle is arranged on the steel cover plate, and an overhauling crawling ladder is arranged in the hole.

Compared with the prior art, the utility model has the following characteristics and beneficial effect:

compared with the prior art, the method has the following advantages:

1, the utility model arranges a water collecting device (comprising an upper water collecting groove and a lower water collecting groove) at the air port of the branch air pipe, which can collect the water dripping of the automobile or the water on the clean ground, and the accumulated water can be naturally volatilized because the output is small and the emission is not considered; according to experience, the water collecting tray has the depth of 5-10mm to meet the requirement; the air port and the main body parts of the air valve are made of stainless steel materials, and when the water collecting tank is cleaned, the air port grille can be opened and then the air valve can be directly pulled out from the branch air pipe for washing; meanwhile, the inner wall of the underground metal spiral air pipe is coated with anticorrosive and acid-proof coatings, such as polytetrafluoroethylene, polypropylene and the like, so that the corrosion of acid-substance-containing wet air to the inner wall of the metal can be protected, and meanwhile, the friction force is reduced, and the energy consumption of the fan in conveying is greatly reduced.

2, the coarse filter (such as a nylon-nylon woven net) is arranged in the air port of the branch air pipe, and the coarse filter is easy to disassemble, clean and replace; the difference between the main air duct and the ordinary well is that the well is under negative pressure and has better sealing performance.

Drawings

Fig. 1 is a plan view of the tuyere of the present invention.

Fig. 2 is a sectional view of fig. 1-1 of the present invention.

Fig. 3 is a sectional view 2-2 of fig. 1 showing a maximum opening state of the air valve according to the present invention.

Fig. 4 is a cross-sectional view 2-2 of fig. 1 showing the damper closed state according to the present invention.

Figure 5 is a cross-sectional view of figure 2 taken at 3-3,

fig. 6 is an explanatory view of the movement of the air flow in the valve body according to the present invention.

Fig. 7 is a plan view of the man-accessible well cleaner of the present invention.

Fig. 8 is a longitudinal section of the man-accessible well cleaner of the present invention.

Fig. 9 is an enlarged view of a portion a in fig. 8.

Fig. 10 is a schematic view of the concrete foundation layer poured in the trough of the present invention.

Fig. 11 is a schematic view of the metal spiral duct of the present invention connected to a concrete foundation layer.

Fig. 12 is a schematic view of the present invention, which is used to pour the concrete shell of the air duct outside the metal spiral duct.

Fig. 13 is a schematic view of the present invention with the air valve, water collection device, filtering device and grille placed in the branch duct.

Fig. 14 is a layout diagram of the man-accessible clean well of the present invention.

Fig. 15 is a schematic view of the communication between the underground exhaust system and the heat recovery device of the roof.

Reference numerals: 1-trough body, 2-concrete foundation layer, 3-metal spiral air pipe, 4-pipe hoop, 5-expansion bolt, 6-branch air pipe, 7-flange, 8-template, 9-air pipe concrete shell, 10-original soil, 11-air valve, 12-water collecting device, 13-filtering device, 14-grid, 15-rubber shock pad, 16-angle steel, 17-man-accessible cleaning well, 18-heat recovery device, 19-waterproof gasket, 20-reinforcing rib, 21-reinforced concrete structure, 22-flexible waterproof sleeve, 23-air supply outlet, 24-roof machine room,

11.1-valve body, 11.2-steel support, 11.3-transmission shaft, 11.4-nut, 11.5-circular hand wheel, 11.6-spring, 11.7-connecting device, 11.8-first fixed hinge, 11.9-connecting rod, 11.10-second fixed hinge, 11.11-valve leaf, 11.12-third fixed hinge,

12.1-a lower water collecting tank, 12.2-an upper water collecting tank,

13.1-coarse filter, 13.2-lower fixed filter plate card, 13.3-upper fixed filter plate card,

17.1-hole, 17.2-steel cover plate, 17.3-cover plate fastener, 17.4-maintenance ladder stand,

18.1-factory building air outlet, 18.2-heat exchange unit, 18.3-factory building fresh air inlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 15, the utility model relates to an air pipe direct burial construction structure, including cell body (1), concrete foundation layer (2) of pouring in cell body (1), metal spiral duct (3) of connection on concrete foundation layer (2), perpendicular welding branch tuber pipe (6) on metal spiral duct (3), set up integrative air valve subassembly and grid (14) of setting at integrative air valve subassembly suitable for reading in branch tuber pipe (6).

The integrated air valve assembly comprises an air valve (11), a water collecting device (12) and a filtering device (13), wherein the water collecting device (12) and the filtering device are arranged above the air valve (11); the integrated air valve assembly is integral in structure and can be taken out and cleaned at the same time.

The air valve (11) comprises a stainless steel valve body (11.1) with the thickness of 4mm, the valve body is arranged by being attached to the inner wall of the branch air pipe, the upper opening of the valve body (11) is bent outwards to form a clamping edge, and the clamping edge is clamped on the upper opening of the branch air pipe; the middle part of the valve body is provided with a horizontal steel support (11.2), two sides of the steel support are welded with the inner wall of the valve body, and the size of the steel support is 155 x 30 x10 mm; a vertical transmission shaft (11.3) with the diameter of 12mm penetrates through the center of the steel support, a nut (11.4) penetrates through the transmission shaft, and the nut is positioned on the upper surface of the steel support; the top end of the transmission shaft is provided with a circular hand wheel (11.5), the diameter of the hand wheel is 40mm, and the hand wheel is provided with an opening mark; the lower part of the transmission shaft is connected with a spring (11.6) in a penetrating way, the spring is positioned on the lower surface of the steel support, the diameter of the spring is 15mm, the deformation is 270mm, and the load is 13 Kgf; the bottom end of the transmission shaft is provided with a connecting device (11.7) (used for connecting two ends of a fixed hinged support, serving as a coupling guide support and limiting a spring), two ends of the connecting device are connected with a first fixed hinged support (11.8), and two ends of the first fixed hinged support are connected with a connecting rod (11.9) with the length of 2 mm; a pair of sides of the inner wall of the valve body are connected with a valve leaf (11.11) with the thickness of 4mm through a second fixed hinge support (11.10), and the middle part of the valve leaf is connected with a third fixed hinge support (11.12); the connecting rod is hinged with the third fixed hinge support.

The transmission shaft is connected with the lower water collecting tank in a penetrating way, and a waterproof gasket (19) is arranged between the nut connected on the transmission shaft in a penetrating way and the upper surface of the lower water collecting tank.

The water collecting device (12) comprises a lower water collecting tank (12.1) arranged in the middle part in the branch air duct and an upper water collecting tank (12.2) arranged on one side in the branch air duct; the lower water collecting tank is a stainless steel tank body with the thickness of 1mm, is welded in the middle of the top surface of the air valve, and the cross section of the lower water collecting tank comprises a U-shaped part and an L-shaped part which is bent outwards along two ends of the U-shaped part; the upper water collecting groove is a stainless steel groove body with the thickness of 1mm, the upper water collecting groove is welded on the inner wall of the branch air pipe, and the cross section of the upper water collecting groove comprises an L-shaped section and a vertical part vertically welded on the lower surface of the L-shaped section.

The filter device (13) comprises a coarse filter (13.1), a lower fixed filter plate card (13.2) for fixing the coarse filter and an upper fixed filter plate card (13.3); a rotatable lower fixed filter plate clamping piece (13.2) is connected to the inner side of the lower water collecting tank through a fixing screw, and a lower bayonet is formed between the lower fixed filter plate clamping piece (13.2) and an L-shaped part of the lower water collecting tank (12.1); the rotatable upper fixed filter plate clamping piece (13.3) is connected to the inner side of the upper water collecting tank through a fixing screw, and an upper bayonet is formed between the upper fixed filter plate clamping piece (13.3) and the vertical part of the upper water collecting tank (12.2); the coarse filter is clamped between the upper bayonet and the lower bayonet; the coarse filter is a nylon brocade woven mesh with the thickness of 10mm, and the height h =0.5 × Bmm.

The space between the valve body and the coarse filter forms a static pressure chamber.

The rubber shock pad (15) is arranged between the top surface of the air valve and the lower surface of the grating, and particularly, the rubber shock pad is arranged between the clamping edge of the valve body and the lower surface of the grating; the rubber shock pad (15) is 15mm thick and plays a role in shock absorption and sealing.

The grid (14) is a 50mm thick stainless steel grid, flush with the ground.

The angle steel (16) is 4mm thick and is flush with the ground; the reentrant corner department welding of angle steel has strengthening rib (20), and the strengthening rib is connected with the concrete floor, and the specification is 8@150, L =100 mm.

A square reinforced concrete structure (21) is built at a three-way node of a metal spiral duct in an underground ventilation system of an industrial automobile factory building, the net size of the inside of the structure is 1.9 x 1.8m (H), and a flexible waterproof sleeve (22) is sleeved at the corner of the reinforced concrete structure.

The man-accessible clean well (17) comprises a hole (17.1) which is arranged at one corner of a reinforced concrete structure and has a cross section of 800-800 mm, a steel cover plate (17.2) with the thickness of 10mm is arranged at the upper opening of the hole, a hidden cover plate buckle (17.3) is arranged on the steel cover plate, an overhauling ladder (17.4) is arranged in the hole, a gasket with the thickness of 15mm is padded between the steel cover plate (17.2) and the concrete ground, and the gasket is a rubber gasket and plays roles of shock absorption and sealing; the utility model discloses a setting can be lower one's clean well, and secret metal spiral duct can be lower one's clear up and overhaul as main wind channel, and all subaerial vents all can independently carry out air regulation.

The heat recovery device (18) comprises a roof machine room (24) arranged on a truss structure of the plant, a heat exchange unit (18.2) is arranged in the roof machine room, a fresh air inlet (18.3) of the plant is arranged on one side of the roof machine room, and an exhaust outlet (18.1) of the plant is arranged at the top of the roof machine room; the heat exchange unit is communicated with a metal spiral air pipe of an underground ventilation system of an industrial automobile factory building.

The heat recovery device (18) adopts a direct discharge mode for waste gas in the underground ventilation system of the original industrial automobile factory building, so that a large amount of fresh air needs to be supplemented indoors in summer and winter, and the fresh air consumes a large amount of cold and heat; waste gas collected by an underground ventilation system is connected into a heat recovery device of a roof through a pipeline, and is discharged after indirectly exchanging heat with fresh air, so that the fresh air is precooled by the waste gas in summer, and the fresh air is preheated by tail gas in winter, thereby greatly saving the energy consumption of an air conditioner; compared with direct emission, the energy-saving rate is about more than 50%.

The utility model relates to a construction method of air pipe direct-burried construction structure:

step one, a groove body (1) is formed in the ground, and the groove body is formed in the civil engineering ground.

And step two, pouring a concrete foundation layer (2) with the thickness of about 100mm at the bottom of the groove body.

And step three, placing a circular metal spiral air pipe (3) with the diameter of more than or equal to 1m and the thickness of 1mm (the inner wall of the pipeline is coated with anticorrosive and acid-proof coating for protection) on the concrete foundation layer, fixing the metal spiral air pipe by using a pipe hoop (4), and fixing the pipe hoop on the concrete foundation layer by using an expansion bolt (5).

In the above, the setting purpose of the expansion bolt (5): the concrete foundation layer (2) is arranged for setting the expansion bolts (5), the expansion bolts (5) are arranged for fixing the air channel, the most important function is that the air channel is easy to float due to light specific gravity in the concrete pouring process, once the air channel floats, the construction needs to be reworked, the expansion bolts (5) are arranged and fixed on the concrete foundation layer (2), a group of intervals are set, calculation is carried out according to pipe diameters, the pipe diameter is larger theoretically, the buoyancy is larger, and the density of fixed point positions is relatively large.

Step four, designing a ground elevation (the general ground of the process is not finished yet), vertically welding a branch air pipe (6) with the thickness of 2mm at the top of the metal spiral air pipe (the branch air pipe and the metal spiral air pipe are welded in an enhanced mode), setting a group of flanges (7) of 35X10 every 150mm of the branch air pipe to increase strength, designing the ground elevation by the pipe orifice of the branch air pipe, and setting a protective cover plate for temporary protection at the pipe orifice of the branch air pipe in the construction stage.

The branch tuber pipe interval sets up the flange in order to guarantee sufficient intensity, the reason is as follows: the stress released by the concrete in the condensation process can easily deform the air duct of the rectangular branch air duct, and the flange is added to resist the external force, otherwise, the deformation is easily caused.

Fifthly, supporting templates (8) at two sides of the metal spiral air duct by a construction unit, pouring concrete in the templates, filling the concrete to protect the metal spiral air duct to form an air duct concrete shell (9), wherein the minimum thickness is 250 mm; the utility model discloses pour concrete outside metal spiral air duct and form tuber pipe concrete shell (9), strengthen the technique through appropriate concrete, realize carrying out the technique that the direct-burried laid with ordinary pipeline, reached and need set up air supply or exhaust system's purpose on ground under certain special environment.

And step six, removing the mold and backfilling the original soil (10) in the groove body.

And seventhly, placing an air valve (11) in the branch air pipe, then installing a water collecting device (12) and a filtering device (13) above the air valve, installing a grid (14), and installing a rubber shock pad (15) below the grid.

And step eight, pouring the peripheral ground (the reserved ground opening needs to be accurate) after the angle steel (16) is utilized for formwork erecting.

And step nine, arranging a man-dropping cleaning well (17) in the system under the roadway.

Step ten, the waste gas collected by the underground ventilation system is connected into a heat recovery device (18) of a roof machine room (24), and the waste heat is recovered and then discharged from the roof.

Conventional metal spiral air duct is all iron, and the cost is low, nevertheless corrodes easily, if change into stainless steel, the cost is too high, consequently, increases the utility model discloses increase and establish at rust-resistant structure of corroding, specifically include and paint anticorrosive, acid-proof coating at metal spiral air duct inner wall, add water-collecting device.

The utility model discloses set up air pipe with the lowest cost solution subaerial to carry out a mode of ventilating through the wind gap that sets up subaerial, the wind gap possesses independent controllability simultaneously and can carry out the amount of wind balance adjustment in wind gap and wind gap.

The utility model discloses a metal spiral duct that possesses certain intensity gives concrete formwork, constitutes the air pipe that an inner wall is smooth and have good closed inner chamber again, and the pipeline both can be used for supplying air also can be used for exhaust system.

The utility model generally carries out technical arrangement after the construction organization is carried out on the specific required project by a construction unit; the utility model discloses there is not finished product component almost in the construction, and required product all can be processed at the scene by oneself and accomplish.

The utility model has the advantages that: the utility model saves materials (including concrete, steel bars and excavation earthwork amount), and the used materials are about 60 percent of the traditional process; the utility model saves labor, has fast construction speed, and the labor is about 30 percent of the traditional process; the utility model adopts the metal spiral air pipe as the lining, the inner wall of the underground ventilation system of the industrial automobile factory building is smooth and has good tightness, thus indirectly saving the energy consumption of the fan and being about 80 percent smaller than the resistance of the civil engineering air duct; the rubber shock pad (15) is arranged between the top surface of the clamping edge of the valve body (11.1) and the lower surface of the grating (14), the local part of the ventilation opening has the capability of resisting rolling of an automobile, and simultaneously, the ventilation opening has the function of manually adjusting the air volume; the utility model discloses the acidproof and personnel of being convenient for of industry automobile factory building underground ventilation system clean.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. The utility model provides a ventilation pipe direct burial construction structure which characterized in that: the device comprises a tank body (1), a concrete foundation layer (2) poured in the tank body (1), a metal spiral air pipe (3) connected to the concrete foundation layer (2), a branch air pipe (6) vertically welded on the metal spiral air pipe (3), an integrated air valve component arranged in the branch air pipe (6) and a grid (14) arranged at the upper opening of the integrated air valve component;

the integrated air valve assembly comprises an air valve (11), a water collecting device (12) and a filtering device (13), wherein the water collecting device (12) and the filtering device are arranged above the air valve (11);

the water collecting device (12) comprises a lower water collecting tank (12.1) arranged in the middle of the branch air pipe and an upper water collecting tank (12.2) arranged on one side of the branch air pipe; the lower water collecting tank is welded in the middle of the top surface of the air valve, and the cross section of the lower water collecting tank comprises a U-shaped part and an L-shaped part which is bent outwards along two ends of the U-shaped part; the upper water collecting tank is welded on the inner wall of the branch air pipe, and the cross section of the upper water collecting tank comprises an L-shaped section and a vertical part vertically welded on the lower surface of the L-shaped section.

2. The ventilation duct direct burial construction structure of claim 1, wherein: the filter device (13) comprises a coarse filter (13.1), a lower fixed filter plate card (13.2) for fixing the coarse filter and an upper fixed filter plate card (13.3); a rotatable lower fixed filter plate clamping piece (13.2) is connected to the inner side of the lower water collecting tank through a fixing screw, and a lower bayonet is formed between the lower fixed filter plate clamping piece (13.2) and the L-shaped part of the lower water collecting tank (12.1); the rotatable upper fixed filter plate clamping piece (13.3) is connected to the inner side of the upper water collecting tank through a fixing screw, and an upper bayonet is formed between the upper fixed filter plate clamping piece (13.3) and the vertical part of the upper water collecting tank (12.2); the coarse filter is clamped between the upper bayonet and the lower bayonet.

3. The ventilation duct direct burial construction structure of claim 1, wherein: the air valve (11) comprises a valve body (11.1), a horizontal steel support (11.2) is arranged in the middle of the valve body, a vertical transmission shaft (11.3) penetrates through the center of the steel support, a nut (11.4) penetrates through the transmission shaft, and the nut is positioned on the upper surface of the steel support; a round hand wheel (11.5) is arranged at the top end of the transmission shaft, a spring (11.6) is connected to the lower part of the transmission shaft in a penetrating manner, and the spring is positioned on the lower surface of the steel support; the bottom end of the transmission shaft is provided with a connecting device (11.7), two ends of the connecting device are connected with a first fixed hinged support (11.8), and two ends of the first fixed hinged support are connected with a connecting rod (11.9); a pair of sides of the inner wall of the valve body are connected with a valve leaf (11.11) through a second fixed hinge support (11.10), and the middle part of the valve leaf is connected with a third fixed hinge support (11.12); the connecting rod is hinged with the third fixed hinge support.

4. A ventilation duct direct burial construction structure according to claim 3, wherein: the transmission shaft (11.3) penetrates through the lower water collecting tank (12.1), and a waterproof gasket (19) is arranged between a nut (11.4) which is connected to the transmission shaft in a penetrating manner and the upper surface of the lower water collecting tank (12.1).

5. A ventilation duct direct burial construction structure according to claim 3, wherein: the upper opening of the valve body (11.1) is bent outwards to form a clamping edge, and the clamping edge is clamped at the upper opening of the branch air pipe.

6. The ventilation duct direct burial construction structure of claim 5, wherein: the rubber shock pad (15) is arranged between the top surface of the clamping edge of the valve body (11.1) and the lower surface of the grating (14).

7. The direct burial construction structure of ventilation duct according to any one of claims 1 to 6, characterized in that: the internal corner of the angle steel (16) is welded with a reinforcing rib (20), and the reinforcing rib is connected with the concrete floor.

8. The ventilation duct direct burial construction structure according to any one of claims 1 to 6, wherein: a reinforced concrete structure (21) is built at the three-way joint of the metal spiral air pipe, and a flexible waterproof sleeve (22) is sleeved at the corner of the reinforced concrete structure.

9. A ventilation duct direct burial construction structure according to claim 8, wherein: the man-down cleaning well (17) is arranged at one corner of the reinforced concrete structure (21).

10. A ventilation duct direct burial construction structure according to claim 9, wherein: the man-dropping clean well (17) comprises a hole (17.1) arranged at one corner of a reinforced concrete structure (21), a steel cover plate (17.2) is arranged at the upper opening of the hole, a hidden cover plate buckle (17.3) is arranged on the steel cover plate, and an overhauling crawling ladder (17.4) is arranged in the hole.

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