CN115110369B - Extrusion type forced ventilation cooling roadbed structure and construction method thereof - Google Patents
Extrusion type forced ventilation cooling roadbed structure and construction method thereof Download PDFInfo
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- CN115110369B CN115110369B CN202210923751.5A CN202210923751A CN115110369B CN 115110369 B CN115110369 B CN 115110369B CN 202210923751 A CN202210923751 A CN 202210923751A CN 115110369 B CN115110369 B CN 115110369B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to an extrusion type forced ventilation cooling roadbed structure, which comprises a ventilation system, a broken stone leveling layer, a heat insulation board, a cushion layer and a pavement structure layer which are sequentially arranged above the ground surface from bottom to top; the ventilation system comprises a U-shaped ventilation pipe, the horizontal section of the U-shaped ventilation pipe is embedded tightly against the ground surface, and vertical pipes on two sides are respectively arranged on two sides of the roadbed; a plurality of air inlets are arranged on a vertical pipe at one side of the U-shaped ventilation pipe, and the top end of the U-shaped ventilation pipe is closed; an air flow accelerating device is arranged at the L-shaped corner of the vertical pipe at the other side of the U-shaped ventilation pipe, and an extrusion type forced ventilation pump is arranged at the top end of the vertical pipe; and a water collecting device is arranged on the vertical pipe between the airflow accelerating device and the extrusion type forced ventilation pump. Meanwhile, the invention also discloses a construction method of the roadbed structure. The invention has the advantages of simple manufacture, strong practicability and high heat exchange efficiency, and can remarkably improve the thermal stability of the roadbed in the permafrost region.
Description
Technical Field
The invention relates to the field of ventilation cooling roadbed in permafrost areas, in particular to an extrusion type forced ventilation cooling roadbed structure and a construction method thereof.
Background
In recent years, with the accelerated development of the construction of the infrastructure in China, especially the construction in the traffic field, especially in the northwest, southwest Qinghai-Tibet plateau and northeast high-latitude permafrost regions of China, the original surface conditions of the field are inevitably changed for building engineering buildings such as roads, railways and the like, so that the ground temperature is increased, the permafrost is melted, the upper limit of the permafrost moves downwards, the bearing capacity of the foundation is reduced, and the stability of the upper engineering structures is threatened. Such engineering defects present in permafrost regions present a significant challenge to the stability, driving safety and comfort of road or railroad bed.
Aiming at the stability problem of the roadbed in the permafrost region, the key technical problem to be solved is how to achieve the effect of cooling the roadbed by regulating conduction, convection or radiation. At present, the technical measures for solving the stability of roadbed in permafrost areas mainly comprise: (1) The heat insulation material is paved above the roadbed or the sunshade plate is arranged on the roadbed to prevent the heat absorbed by the road surface from being conducted to the deep part of the roadbed, so that the heat insulation effect is better in a short period of time, but the effect is often poor when the time span is larger; (2) The ventilation pipe is paved in the roadbed or the block stone is adopted as the roadbed structure, natural wind is utilized to take away heat in the roadbed, so that the effect of cooling the roadbed is achieved, however, practice discovers that the measures can exert the maximum effect when the natural wind direction is perpendicular to the trend of the road, and meanwhile, in areas with strong wind and sand, the ventilation pipe or the block stone roadbed holes are extremely easy to be blocked by wind and sand, so that the convective heat exchange effect of the roadbed structure is weakened or even completely lost. Therefore, the technical scheme cannot play a long-lasting role in protecting or improving the stability of the roadbed in the permafrost region, and an extrusion forced ventilation cooling roadbed structure is necessary to be provided, so that the limit of the structure on the service environment, wind direction and the like can be overcome while the stability of the roadbed in the permafrost region is ensured.
Disclosure of Invention
The invention aims to solve the technical problem of providing an extrusion forced ventilation cooling roadbed structure with high heat exchange efficiency and improved roadbed thermal stability.
The invention aims to provide a construction method of the extrusion forced ventilation cooling roadbed structure.
In order to solve the above problems, the extrusion forced ventilation cooling roadbed structure of the present invention is characterized in that: the roadbed structure comprises a ventilation system, a broken stone leveling layer, a heat insulation board, a cushion layer and a pavement structure layer which are sequentially arranged above the ground surface from bottom to top; the ventilation system comprises a U-shaped ventilation pipe, the horizontal section of the U-shaped ventilation pipe is embedded tightly against the ground surface, and vertical pipes on two sides are respectively arranged on two sides of the roadbed; a plurality of air inlets are arranged on a vertical pipe at one side of the U-shaped ventilation pipe, and the top end of the U-shaped ventilation pipe is closed; an air flow accelerating device is arranged at the L-shaped corner of the vertical pipe at the other side of the U-shaped ventilation pipe, and an extrusion type forced ventilation pump is arranged at the top end of the vertical pipe; and a water collecting device is arranged on the vertical pipe between the airflow accelerating device and the extrusion type forced ventilation pump.
The length of the horizontal section in the U-shaped ventilation pipe is equal to the width of the lowest layer of the section of the roadbed, and the length of the vertical pipes positioned on two sides of the roadbed is 3-4 m greater than the thickness of the roadbed.
The air inlet is formed in a range of 10-15 cm away from the closed top end of the U-shaped ventilation pipe, and the diameter of the air inlet is 0.5-1 cm.
The airflow accelerating device is composed of two L-shaped flow dividing plates welded on the inner wall of the U-shaped ventilation pipe in opposite directions.
The water collecting device comprises a water storage tank nested on the U-shaped ventilation pipe; the water storage tank is positioned above the airflow accelerating device, and a drain valve is arranged at the lowest side of the water storage tank; a plurality of water collecting holes are uniformly distributed on the U-shaped ventilation pipe of the nesting section; and a water collecting plate is arranged on the inner wall of the U-shaped ventilation pipe and is close to the lower edge of the water collecting hole of the same layer.
The water collecting plate and the inner wall of the U-shaped ventilation pipe are arranged obliquely upwards at an acute angle, and the length of the water collecting plate is equal to the radius of the nesting section of the water storage tank and the U-shaped ventilation pipe; the juncture of the inner wall of the U-shaped ventilation pipe and the acute angle formed by the water collecting plate is provided with a water collecting hole with the diameter of 1-2 cm.
The distance between the bottom surface of the water storage tank and the nearest water collecting hole is 15-20 cm.
The diameter of the U-shaped ventilation pipe passing through the top of the water storage tank is changed into 1/3 of the original diameter.
The extrusion type forced ventilation pump comprises an extrusion type forced ventilation pump shell connected with the U-shaped ventilation pipe through a shaft sleeve; the top of the extrusion type forced ventilation pump shell is provided with a wind direction plate, the cylindrical inner wall of the extrusion type forced ventilation pump shell is attached with a hose, one end of the hose stretches into the U-shaped ventilation pipe, and the other end of the hose is exposed in the air; the extrusion type forced ventilation pump shell is provided with a central hole, a fixed shaft penetrates through the central hole, and two ends of the fixed shaft are respectively positioned at the inner side and the outer side of the extrusion type forced ventilation pump shell; the shaft head of the fixed shaft positioned at the outer side of the extrusion type forced ventilation pump shell is provided with fan blades; and the roller support is sleeved on the fixed shaft positioned in the cavity of the extrusion forced ventilation pump shell, and the outer ends of the roller support are respectively connected with extrusion rollers through pins.
The construction method of the extrusion forced ventilation cooling roadbed structure comprises the following steps:
the method comprises the steps of selecting lines according to the design of a highway or a railway, leveling and compacting the ground surface at a roadbed to be built by using a large machine;
according to the roadbed design drawing, prefabricated U-shaped ventilation pipe air inlet section in mill:
the diameter of a vertical pipe at one side of the U-shaped ventilation pipe is 10-20 cm, the top end of the vertical pipe is closed, and an air inlet hole with the diameter of 0.5-1 cm is formed in the range of 10-15 cm away from the top end and is used as an air inlet; the diameter of the horizontal section of the U-shaped ventilation pipe is 10-20 cm, the length of the horizontal section is equal to the width of the lowest layer of the section of the roadbed, and the lengths of the vertical pipes positioned on two sides of the roadbed are 3-4 m greater than the thickness of the roadbed; an air flow accelerating device is arranged on a vertical pipe at the L-shaped corner of the other side of the U-shaped ventilation pipe;
the prefabricated water collecting device:
the water storage tank is arranged at the position 5-10 cm above the airflow accelerating device, and the diameter of the U-shaped ventilation pipe is changed into 1/3 of the original diameter after passing through the top of the water storage tank; the water storage tank is in a cube shape with the side length of 0.5-1 m, one surface is provided with a hole with the diameter equal to the diameter of the air inlet section of the U-shaped ventilation pipe, and the other surface opposite to the water storage tank is provided with a hole with the diameter equal to 1/3 of the diameter of the air inlet section of the U-shaped ventilation pipe; the U-shaped ventilation pipe and the inner wall of the nesting section of the water storage tank are provided with water collecting holes with the diameter of 1-2 cm, the upper edges of the water collecting plates are aligned with the lower edges of the water collecting holes and then welded, and a drain valve is arranged at the lowest side edge of the water storage tank; the drain valve is a pressure-sensitive one-way valve, and is automatically opened to drain water outwards when the water level in the water storage tank reaches 10-15 cm;
fourth step, assembling a ventilation system:
welding one end of the U-shaped ventilation pipe with an airflow accelerating device with a reserved hole at the bottom of the water storage tank; the extrusion type forced ventilation pump is connected to the top end of the U-shaped ventilation pipe above the water collecting device through a shaft sleeve;
paving a broken stone leveling layer:
placing the assembled ventilation system on the ground surface of the roadbed to be built perpendicular to the road trend, and ensuring that the plane of the U-shaped ventilation pipe is perpendicular to the ground surface and the road trend; paving broken stone above the horizontal section in the U-shaped ventilation pipe and leveling to form a broken stone leveling layer;
and (3) paving a heat-insulating board on the broken stone leveling layer, sequentially paving a cushion layer and a pavement structure layer above the heat-insulating board, leveling and compacting by rolling to finish the construction of the ventilated cooling roadbed.
Compared with the prior art, the invention has the following advantages:
1. the extrusion type forced ventilation pump is arranged in the invention, and the natural wind is utilized to drive the extrusion type forced ventilation pump, so that a negative pressure environment is formed in the U-shaped ventilation pipe, external cold air is promoted to enter the ventilation pipe, heat in the roadbed is taken away, and frozen soil at the lower part of the roadbed is prevented from melting, thereby improving the stability of the roadbed.
2. According to the invention, the wind direction plate is arranged at the top of the extrusion type forced ventilation pump shell, so that the fan blades of the extrusion type forced ventilation pump are always opposite to the windward side, thereby achieving the purpose of self-adapting to wind direction and improving the ventilation and heat exchange efficiency of the ventilation system.
3. According to the invention, the air flow accelerating device is arranged in the U-shaped ventilation pipe, and in the process of exhausting the warm air in the roadbed, the temperature of the horizontal section of the L-shaped flow dividing plate arranged at the lower part is slightly higher than that of the upper region of the L-shaped flow dividing plate, and a negative pressure region is formed in the region above the horizontal section, so that a chimney effect is formed, the air flow in an air passage is promoted, and the ventilation capacity of the ventilation pipe is improved.
4. According to the invention, the water collecting device is arranged on the vertical pipe at one side of the U-shaped ventilation pipe, and the water in the warm air flowing out of the roadbed is effectively collected into the water storage tank by utilizing the condensation effect, so that the condensate water is prevented from flowing back to the horizontal section of the U-shaped ventilation pipe to block the air passage.
5. The invention has simple manufacture and strong practicability, does not consume mechanical power, and can obviously improve the thermal stability of the roadbed in permafrost areas.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
FIG. 1 is a schematic cross-sectional view of the present invention.
Fig. 2 is a schematic structural view of the ventilation system in the present invention.
Fig. 3 is a schematic view of the internal structure of the extrusion forced ventilation pump in the present invention.
Fig. 4 is a side view of an extrusion forced draft pump of the present invention.
FIG. 5 is a schematic diagram of an airflow accelerating apparatus according to the present invention.
FIG. 6 is a schematic view of a water collecting device according to the present invention.
In the figure: 1-ground surface, 2-ventilation system, 3-rubble leveling layer, 4-heat preservation heat insulating board, 5-bed course, 6-road surface structural layer, 7-air current accelerating device, 8-L-shaped splitter plate, 9-water collecting device, 10-water collecting plate, 11-water collecting hole, 12-water storage tank, 13-drain valve, 14-extrusion forced ventilation pump, 15-U-shaped ventilation pipe, 16-hose, 17-extrusion roller, 18-fixed axle, 19-roller support, 20-pin, 21-extrusion forced ventilation pump shell, 22-flabellum, 23-wind direction plate, 24-axle sleeve.
Detailed Description
As shown in fig. 1 to 6, an extrusion type forced ventilation cooling roadbed structure comprises a ventilation system 2, a broken stone leveling layer 3, a heat insulation board 4, a cushion layer 5 and a pavement structure layer 6 which are sequentially arranged above a ground surface 1 from bottom to top. The ventilation system 2 comprises a U-shaped ventilation pipe 15, the horizontal section of the U-shaped ventilation pipe 15 is embedded against the ground surface 1, and vertical pipes on two sides are respectively arranged on two sides of the roadbed; a plurality of air inlets are arranged on a vertical pipe at one side of the U-shaped ventilation pipe 15, and the top end of the U-shaped ventilation pipe is closed; the other side of the U-shaped ventilation pipe 15 is provided with an air flow accelerating device 7 at the L-shaped corner of the vertical pipe, and the top end of the vertical pipe is provided with an extrusion type forced ventilation pump 14; a water collecting device 9 is arranged on the vertical pipe between the airflow accelerating device 7 and the extrusion forced ventilation pump 14.
Wherein: the length of the horizontal section in the U-shaped ventilation pipe 15 is equal to the width of the lowest layer of the section of the roadbed, and the length of the vertical pipes positioned on the two sides of the roadbed is 3-4 m greater than the thickness of the roadbed.
The air inlet is arranged in a range of 10-15 cm away from the closed top end of the U-shaped ventilation pipe 15, and the diameter of the air inlet is 0.5-1 cm.
The air flow accelerating device 7 is composed of two L-shaped flow dividing plates 8 which are welded on the inner wall of the U-shaped ventilation pipe 15 in opposite directions.
The water collecting device 9 comprises a water storage tank 12 nested on a U-shaped ventilation pipe 15; the water storage tank 12 is positioned above the airflow accelerating device 7, and a drain valve 13 is arranged at the lowest side of the water storage tank 12; a plurality of water collecting holes 11 are uniformly distributed on the U-shaped ventilation pipe 15 of the nesting section; a water collecting plate 10 is arranged on the inner wall of the U-shaped ventilation pipe 15 and is close to the lower edge of the water collecting hole 11 of the same layer.
The water collecting plate 10 and the inner wall of the U-shaped ventilation pipe 15 are arranged obliquely upwards at an acute angle, and the length of the water collecting plate 10 is equal to the radius of the nesting section of the water storage tank 12 and the U-shaped ventilation pipe 15; the juncture of the inner wall of the U-shaped ventilation pipe 15 and the acute angle formed by the water collecting plate 10 is provided with a water collecting hole 11 with the diameter of 1-2 cm.
The distance between the bottom surface of the water storage tank 12 and the nearest water collecting hole 11 is 15-20 cm.
The diameter of the U-shaped ventilation pipe 15 after passing through the top of the water storage tank 12 becomes 1/3 of the original diameter.
The squeeze forced draft pump 14 includes a squeeze forced draft pump housing 21 connected to a U-shaped draft tube 15 by a sleeve 24; the top of the extrusion forced ventilation pump shell 21 is provided with a wind direction plate 23, the cylindrical inner wall of the extrusion forced ventilation pump shell is attached with a hose 16, one end of the hose 16 stretches into the U-shaped ventilation pipe 15, and the other end is exposed in the air; the extrusion type forced ventilation pump shell 21 is provided with a central hole, the central hole penetrates through the fixed shaft 18, and two ends of the fixed shaft 18 are respectively positioned at the inner side and the outer side of the extrusion type forced ventilation pump shell 21; the shaft head of the fixed shaft 18 positioned at the outer side of the extrusion type forced ventilation pump shell 21 is provided with a fan blade 22; a roller bracket 19 is sleeved on a fixed shaft 18 positioned in a cavity of the extrusion forced ventilation pump housing 21, and the outer ends of the roller bracket 19 are respectively connected with extrusion rollers 17 through pins 20.
The squeeze forced draft pump 14 may be a medical pump for hemodialysis.
The shaft sleeve 24 is a sleeve with a sealing rubber ring and capable of freely rotating.
The wind direction plate 23 is provided on the top end of the extrusion type forced ventilation pump housing 21 in parallel to the axial line of the fixed shaft 18.
The distance between the squeeze roller 17 and the inner wall of the squeeze forced draft pump housing 21 is equal to twice the wall thickness of the hose 16.
The hose 16 is a plastic hose having excellent rolling resistance, and has a wall thickness of 1 to 2mm.
The construction method of the extrusion forced ventilation cooling roadbed structure comprises the following steps:
the method comprises the steps of selecting lines according to the design of a highway or a railway, leveling and compacting the ground surface 1 at a roadbed to be built by using a large machine;
according to roadbed design drawing, prefabricated U type ventilation pipe 15 air inlet section in mill:
the diameter of a vertical pipe at one side of the U-shaped ventilation pipe 15 is 10-20 cm, the top end of the vertical pipe is closed, and an air inlet with the diameter of 0.5-1 cm is formed in the range of 10-15 cm away from the top end and is used as an air inlet; the diameter of the horizontal section of the U-shaped ventilation pipe 15 is 10-20 cm, the length of the horizontal section is equal to the width of the lowest layer of the section of the roadbed, and the lengths of the vertical pipes positioned on two sides of the roadbed are 3-4 m greater than the thickness of the roadbed; the vertical pipe at the L-shaped corner of the other side of the U-shaped ventilation pipe 15 is provided with an airflow accelerating device 7;
the following steps are performed:
the water storage tank 12 is arranged at a position 5-10 cm above the airflow accelerating device 7, and after the U-shaped ventilation pipe 15 passes through the top of the water storage tank 12, the diameter of the U-shaped ventilation pipe is changed into 1/3 of the original diameter; the water storage tank 12 is in a cube shape with the side length of 0.5-1 m, one surface is provided with a hole with the diameter equal to the diameter of the air inlet section of the U-shaped ventilation pipe 15, and the other surface opposite to the hole with the diameter equal to 1/3 of the diameter of the air inlet section of the U-shaped ventilation pipe 15; the U-shaped ventilation pipe 15 and the inner wall of the nesting section of the water storage tank 12 are provided with water collecting holes 11 with diameters of 1-2 cm, the upper edge of the water collecting plate 10 is welded after being aligned with the lower edge of the water collecting holes 11, and a drain valve 13 is arranged at the lowest side edge of the water storage tank 12; the drain valve 13 is a pressure-sensitive one-way valve, and when the water level in the water storage tank 12 reaches 10-15 cm, the drain valve 13 is automatically opened to drain outwards;
fourth step, assembling a ventilation system 2:
welding one end of the U-shaped ventilation pipe 15 with the airflow accelerating device 7 with a reserved hole at the bottom of the water storage tank 12; the extrusion type forced ventilation pump 14 is connected to the top end of the U-shaped ventilation pipe 15 above the water collecting device 9 through a shaft sleeve 24;
paving a broken stone leveling layer 3:
placing the assembled ventilation system 2 on the ground surface 1 of the roadbed to be built perpendicular to the road trend, and ensuring that the plane of the U-shaped ventilation pipe 15 is perpendicular to the ground surface 1 and the road trend at the same time; paving broken stone above the horizontal section in the U-shaped ventilation pipe 15 and leveling to form a broken stone leveling layer 3;
the heat-insulating board 4 is paved on the broken stone leveling layer 3, then the cushion layer 5 and the pavement structure layer 6 are paved above the heat-insulating board 4 in sequence, leveling and compaction are carried out, and then the ventilation cooling roadbed construction is completed.
[ working principle ]
As the road surface is paved to change the heat balance condition of the original ground, the temperature inside the roadbed rises, and in the working process of the ventilation system 2, the hot air carried out from the horizontal section of the U-shaped ventilation pipe 15 below the roadbed makes the temperature of the L-shaped splitter plate 8 positioned at the lower part slightly higher, and a negative pressure area is formed above the L-shaped splitter plate 8, so that a chimney effect is formed, the air flow in the U-shaped ventilation pipe 15 is promoted, and the ventilation capacity of the ventilation system 2 is improved.
When the U-shaped ventilation pipe 15 is exposed in the air, water carried in the air in the U-shaped ventilation pipe is condensed, liquid water is attached to the water collecting plate 10 and enters the water storage tank 12 through the water collecting hole 11, and when the water level in the water storage tank 12 reaches 10-15 cm, the pressure-sensitive one-way drain valve 13 is automatically opened to drain water outwards, so that condensate water is prevented from flowing back to the horizontal section of the U-shaped ventilation pipe to block an air passage.
After the construction is finished, natural wind forces the extrusion type forced ventilation pump 14 to rotate around the shaft sleeve 24 until the fan blades 22 face the windward side through the wind direction plate 23 so as to improve the working efficiency; under the drive of wind force, the fan blades 22 drive the fixed shaft 18 and the roller support 19 to rotate, so that the extrusion rollers 17 are forced to extrude the hose 16, air in the hose 16 between two adjacent extrusion rollers 17 is discharged outwards, the air pressure in the U-shaped ventilation pipe 15, which is close to one side of the extrusion forced ventilation pump 14, is reduced, external cold air enters the U-shaped ventilation pipe 15 from an air inlet reserved at the top of a vertical pipe at the other side of the U-shaped ventilation pipe 15, and external cold air takes away heat in a roadbed through the U-shaped ventilation pipe 15, so that the purpose of cooling the roadbed is realized.
Claims (8)
1. An extrusion forced draft cooling roadbed structure which characterized in that: the roadbed structure comprises a ventilation system (2), a broken stone leveling layer (3), a heat insulation board (4), a cushion layer (5) and a pavement structure layer (6) which are sequentially arranged above the ground surface (1) from bottom to top; the ventilation system (2) comprises a U-shaped ventilation pipe (15), the horizontal section of the U-shaped ventilation pipe (15) is embedded tightly against the ground surface (1), and vertical pipes on two sides are respectively arranged on two sides of the roadbed; a plurality of air inlets are arranged on a vertical pipe at one side of the U-shaped ventilation pipe (15) and the top end of the vertical pipe is closed; an air flow accelerating device (7) is arranged at the L-shaped corner of the vertical pipe at the other side of the U-shaped ventilation pipe (15), and an extrusion type forced ventilation pump (14) is arranged at the top end of the vertical pipe; a water collecting device (9) is arranged on the vertical pipe between the air flow accelerating device (7) and the extrusion forced ventilation pump (14); the airflow accelerating device (7) is composed of two L-shaped flow dividing plates (8) welded on the inner wall of the U-shaped ventilation pipe (15) in opposite directions; the extrusion type forced ventilation pump (14) comprises an extrusion type forced ventilation pump housing (21) connected with the U-shaped ventilation pipe (15) through a shaft sleeve (24); the top of the extrusion type forced ventilation pump housing (21) is provided with a wind direction plate (23), the cylindrical inner wall of the extrusion type forced ventilation pump housing is attached with a hose (16), one end of the hose (16) stretches into the U-shaped ventilation pipe (15), and the other end of the hose is exposed to the air; the extrusion type forced ventilation pump housing (21) is provided with a central hole, a fixed shaft (18) penetrates through the central hole, and two ends of the fixed shaft (18) are respectively positioned at the inner side and the outer side of the extrusion type forced ventilation pump housing (21); the shaft head of the fixed shaft (18) positioned at the outer side of the extrusion type forced ventilation pump housing (21) is provided with fan blades (22); the fixed shaft (18) positioned in the cavity of the extrusion forced ventilation pump housing (21) is sleeved with a roller bracket (19), and the outer ends of the roller bracket (19) are respectively connected with extrusion rollers (17) through pins (20).
2. An extruded forced draft cooling subgrade structure according to claim 1, wherein: the length of the horizontal section in the U-shaped ventilation pipe (15) is equal to the width of the lowest layer of the section of the roadbed, and the length of the vertical pipes positioned on two sides of the roadbed is 3-4 m greater than the thickness of the roadbed.
3. An extruded forced draft cooling subgrade structure according to claim 1, wherein: the air inlet is arranged in a range of 10-15 cm away from the closed top end of the U-shaped ventilation pipe (15), and the diameter of the air inlet is 0.5-1 cm.
4. An extruded forced draft cooling subgrade structure according to claim 1, wherein: the water collecting device (9) comprises a water storage tank (12) which is nested on the U-shaped ventilation pipe (15); the water storage tank (12) is positioned above the airflow accelerating device (7), and a drain valve (13) is arranged at the lowest side of the water storage tank (12); a plurality of water collecting holes (11) are uniformly distributed on the U-shaped ventilation pipe (15) of the nesting section; a water collecting plate (10) is arranged on the inner wall of the U-shaped ventilation pipe (15) and is close to the lower edge of the water collecting hole (11) of the same layer.
5. An extruded forced draft cooling subgrade structure according to claim 4, wherein: the water collecting plate (10) and the inner wall of the U-shaped ventilation pipe (15) are arranged obliquely upwards at an acute angle, and the length of the water collecting plate (10) is equal to the radius of the nesting section of the water storage tank (12) and the U-shaped ventilation pipe (15); the water collecting hole (11) with the diameter of 1-2 cm is arranged at the juncture of the acute angle formed by the inner wall of the U-shaped ventilation pipe (15) and the water collecting plate (10).
6. An extruded forced draft cooling subgrade structure according to claim 4, wherein: the distance between the bottom surface of the water storage tank (12) and the nearest water collecting hole (11) is 15-20 cm.
7. An extruded forced draft cooling subgrade structure according to claim 4, wherein: the diameter of the U-shaped ventilation pipe (15) passing through the top of the water storage tank (12) is changed to be 1/3 of the original diameter.
8. The construction method of an extrusion type forced ventilation cooling roadbed structure according to claim 4, comprising the steps of:
the method comprises the steps of selecting lines according to the design of a highway or a railway, leveling and compacting ground surfaces (1) at a roadbed to be built by using large machinery;
prefabricated U type ventilation pipe (15) air inlet section at mill according to road bed design drawing:
the diameter of a vertical pipe at one side of the U-shaped ventilation pipe (15) is 10-20 cm, the top end of the vertical pipe is closed, and an air inlet with the diameter of 0.5-1 cm is formed in the range of 10-15 cm away from the top end and is used as an air inlet; the diameter of the horizontal section of the U-shaped ventilation pipe (15) is 10-20 cm, the length of the horizontal section is equal to the width of the lowest layer of the section of the roadbed, and the lengths of the vertical pipes positioned on two sides of the roadbed are 3-4 m greater than the thickness of the roadbed; an air flow accelerating device (7) is arranged on a vertical pipe at the L-shaped corner of the other side of the U-shaped ventilation pipe (15);
the water collecting device (9) is prefabricated:
the water storage tank (12) is arranged at a position 5-10 cm above the airflow accelerating device (7), and the diameter of the U-shaped ventilation pipe (15) is changed into 1/3 of the original diameter after passing through the top of the water storage tank (12); the water storage tank (12) is in a cube shape with the side length of 0.5-1 m, one surface is provided with a hole with the diameter equal to the diameter of the air inlet section of the U-shaped ventilation pipe (15), and the other surface opposite to the hole is provided with a hole with the diameter equal to 1/3 of the diameter of the air inlet section of the U-shaped ventilation pipe (15); a water collecting hole (11) with the diameter of 1-2 cm is formed in the inner wall of a nesting section of the U-shaped ventilation pipe (15) and the water storage tank (12), the upper edge of the water collecting plate (10) is aligned with the lower edge of the water collecting hole (11) and then welded, and a drain valve (13) is arranged at the lowest side edge of the water storage tank (12); the drain valve (13) is a pressure-sensitive one-way valve, and when the water level in the water storage tank (12) reaches 10-15 cm, the drain valve (13) is automatically opened to drain water outwards;
fourth step, an assembly ventilation system (2):
welding one end of the U-shaped ventilation pipe (15) with the airflow accelerating device (7) with a reserved hole at the bottom of the water storage tank (12) to the rear; the extrusion type forced ventilation pump (14) is connected to the top end of a U-shaped ventilation pipe (15) above the water collecting device (9) through a shaft sleeve (24);
paving a broken stone leveling layer (3):
placing the assembled ventilation system (2) on the ground surface (1) of the roadbed to be built perpendicular to the road trend, and ensuring that the plane of the U-shaped ventilation pipe (15) is perpendicular to the ground surface (1) and the road trend at the same time; paving broken stone above the horizontal section in the U-shaped ventilation pipe (15) and leveling to form a broken stone leveling layer (3);
the method comprises the steps of firstly, paving a heat insulation board (4) on a broken stone leveling layer (3), then paving a cushion layer (5) and a pavement structure layer (6) above the heat insulation board (4) in sequence, leveling, rolling and compacting, and thus, finishing ventilation cooling roadbed construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210923751.5A CN115110369B (en) | 2022-08-02 | 2022-08-02 | Extrusion type forced ventilation cooling roadbed structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210923751.5A CN115110369B (en) | 2022-08-02 | 2022-08-02 | Extrusion type forced ventilation cooling roadbed structure and construction method thereof |
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| RU70269U1 (en) * | 2006-10-10 | 2008-01-20 | Общество с ограниченной ответственностью "Инжиниринговый центр "Ямал" (ООО ИЦ "Ямал") | ROAD FILL ON PERMANENTLY FROZEN SOILS |
| CN101012632A (en) * | 2007-01-12 | 2007-08-08 | 中国科学院寒区旱区环境与工程研究所 | Reinforced ventilating heat-proof foundation |
| CN108118572B (en) * | 2018-01-26 | 2023-11-03 | 四川农业大学 | Piston type active aeration cooling device suitable for permafrost roadbed |
| CN108118571A (en) * | 2018-01-26 | 2018-06-05 | 四川农业大学 | Suitable for the direct drawing-in type active aeration-cooling device of subgrade in permafrost soil zone |
| CN213628026U (en) * | 2020-07-16 | 2021-07-06 | 福建元华泵业有限公司 | Drainage pump capable of being started quickly |
| CN114000520B (en) * | 2021-11-22 | 2023-02-10 | 中国科学院西北生态环境资源研究院 | Ecological restoration side slope anti-skidding planting protection system in alpine region and implementation method |
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