A ventilation heating pipe for tunnel construction in high-altitude and cold areas

Abstract

The present invention belongs to the technical field of tunnel construction, specifically a ventilation and heating pipe for tunnel construction in high-altitude and cold areas, comprising an air duct; a ventilator is fixedly connected to the outer surface of the air duct; a ventilation and heating pipe is provided on the outer surface of the air duct and on a side away from the ventilator; an electric heating pipe is fixedly connected to the interior of the ventilation and heating pipe; a plurality of electric heating pipes are provided, and are arranged in a linear array inside the ventilation and heating pipe; the left and right ends of the ventilation and heating pipe are respectively fixedly connected with an air inlet and an air outlet; when in use, it is beneficial to increase the temperature in the tunnel; ensure the construction environment temperature in the tunnel construction area, increase the strength of the initial support sprayed concrete, lining concrete, inverted arch and inverted arch filling concrete, avoid freezing of groundwater due to low temperature, causing frost heave of the initial support, causing deformation and cracking of the initial support, and forming a safety hazard; and can heat up the entire area in the tunnel.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, in particular to a ventilation and heating pipe for tunnel construction in high-altitude and cold areas. Background Art

[0002] When building railway and highway tunnels in high-altitude and cold areas, the unique plateau environment, low air pressure, low oxygen content and low temperature have a great impact on construction. The work efficiency of construction personnel and mechanical equipment inside and outside the tunnel is seriously reduced. The ambient temperature inside the tunnel directly affects the quality of concrete masonry, resulting in slow construction progress and a poor working environment for construction personnel inside the tunnel.

[0003] There are three main methods commonly used to heat up the tunnel environment during tunnel construction: first, boiler heating air heating technology, which uses boiler heating to provide a heat source to heat the ambient air in the tunnel area; second, heater heating technology, which uses saturated steam or electric heat as the heat medium to heat the ambient air in the tunnel area; third, ventilation air preheating technology, which uses the steam boiler in the boiler room at the entrance to generate steam and adjust the steam to be sent to the heater.

[0004] Among them, the first two types of heating methods can only heat up local areas in the tunnel and cannot meet the heating needs in low-temperature environments; the third heating method uses a boiler room outside the tunnel to provide a heat source, which is highly polluting and requires a large number of personnel. Due to the long distance of heat energy transmission, the heating effect in the tunnel construction area is poor.

[0005] To this end, the present invention provides a ventilation heating pipe for tunnel construction in high-altitude and cold areas. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is: the ventilation and heating pipe for tunnel construction in high-altitude and cold areas described in the present invention comprises an air duct; the outer surface of the air duct is fixedly connected to a ventilator; a ventilation and heating pipe is provided on the outer surface of the air duct and on the side away from the ventilator; the interior of the ventilation and heating pipe is fixedly connected to an electric heating pipe; a plurality of electric heating pipes are provided and are arranged in a linear array inside the ventilation and heating pipe; the left and right ends of the ventilation and heating pipe are respectively fixedly connected to an air inlet and an air outlet; the shape of the air inlet is a tapered air outlet that gradually increases from the inside to the outside; the shape of the air outlet is a tapered air outlet that gradually decreases from the inside to the outside; when working, this air duct is first pre-installed at a suitable position in the tunnel, and then an external controller controls the electric heating pipe in the ventilation and heating pipe to start heating, and controls The ventilator draws the cold air in the tunnel from the air inlet into the interior of the ventilation heating pipe. Through the continuous heating of the electric heating pipe, the cold air can gradually be turned into hot air, and then transmitted to the tunnel through the air duct. Since the shape of the air inlet is a tapered air outlet that gradually increases from the inside to the outside; the shape of the air outlet is a tapered air outlet that gradually decreases from the inside to the outside; the air volume drawn in and released can be large, which is beneficial to the increase of the temperature in the tunnel; ensure the construction environment temperature in the tunnel construction area, increase the strength of the initial support sprayed concrete, lining concrete, inverted arch and inverted arch filling concrete, create a good construction temperature environment, avoid the freezing of groundwater due to low temperature, which causes the initial support to frost heave, deformation and cracking of the initial support, and form a safety hazard; and can heat up the entire area in the tunnel, which is more convenient to use.

[0008] Preferably, the width of the ventilation and heating pipe is smaller than the width of the air duct; the upper and lower sides of the ventilation and heating pipe are fixedly connected to the limiting blocks; the shape of the limiting blocks is concave; a pull rod is provided inside the air duct; the side of the pull rod close to the limiting block is fixedly connected to the holder; the outer surface of the pull rod is fixedly connected to the tension spring; during operation, when the ventilation and heating pipe and the limiting block on its surface move to one side of the pull rod, the staff manually pulls the pull rod, and then the pull rod drives the holder to move and compresses the tension spring. When the limiting block and the holder are on the same vertical plane, the pull rod is released, and the holder will be stuck in the concave limiting block under the recovery of the tension spring, so that the ventilation and heating pipe can be stably installed. It is more convenient to use and can facilitate the installation of the ventilation and heating pipe.

[0009] Preferably, the outer surface of the air duct is provided with a sliding groove adapted to the pull rod; the number of the pull rods is set to be multiple; and they are arranged at equal distances on the outer surface of the air duct; a plurality of pull rods are arranged in a transverse direction, and the installation position of the ventilation and heating pipe on the air duct can be adjusted accordingly according to specific needs.

[0010] Preferably, a slot is provided on the outer surface of the limit block; a support rod is rotatably connected to the outer surface of the holder; the shape of the slot matches the shape of the support rod; during operation, when the holder is stuck in the limit block, the support rod on the outer surface of the holder will gradually be stuck in the slot on the surface of the limit block, which can improve the stability of the ventilation heating pipe, facilitate its heating in the tunnel, and make it more convenient to use.

[0011] Preferably, reinforcing ribs are fixedly connected between the ventilation and heating tubes; the number of the reinforcing ribs is set to be multiple, and the different reinforcing ribs are arranged in a cross shape; when working, reinforcing ribs are set on the outer surface of the ventilation and heating tube, which can improve the self-strength of the ventilation and heating tube and reduce the deformation phenomenon during use.

[0012] Preferably, the inner wall of the ventilation and heating pipe is fixedly connected to a first insulation plate; a sliding plate is provided inside the ventilation and heating pipe; an arc-shaped seat is fixedly connected to the upper and lower sides of the sliding plate; a second insulation plate is provided inside the ventilation and heating pipe; the outer surface of the second insulation plate is arc-shaped close to the arc-shaped seat; during operation, the staff manually pushes the sliding plate to make the sliding plate drive the arc-shaped seats on the upper and lower sides to move, and then the arc-shaped seat will contact the side surface of the second insulation plate and squeeze the arc-shaped surface of the second insulation plate to move the second insulation plate to the side close to the first insulation plate, and then the first insulation plate and the second insulation plate fit together, which can further improve the insulation performance of this ventilation and heating pipe, effectively reduce the heat energy loss of the ventilation and heating pipe, and bring convenience to the temperature increase in the tunnel.

[0013] Preferably, a clamping block is provided on the outer surface of the second insulation board; an arc-shaped groove is provided on the outer surface of the first insulation board; the shape of the clamping block is adapted to the shape of the arc-shaped groove; during operation, when the second insulation board moves, the second insulation board will simultaneously drive the clamping block to move, and the clamping block will then be pressed into the arc-shaped groove on the surface of the first insulation board, thereby stably combining the first insulation board and the second insulation board.

[0014] Preferably, the first insulation board and the second insulation board are both composed of high-temperature resistant asbestos cloth, silicone cloth, aluminum foil fiberglass cloth and high-aluminum aluminum silicate wool, which are paved from the inside to the outside or from the outside to the inside. The high-temperature resistant asbestos cloth plays a heat-insulating role, the silicone cloth plays an insulating role, the aluminum foil fiberglass cloth plays a flame-retardant role, and the high-aluminum aluminum silicate wool plays a heat-insulating role, which greatly improves the performance of this ventilation and heating pipe.

[0015] Preferably, the outer surface of the sliding plate is fixedly connected to a support column. During the movement of the sliding plate, the sliding plate will simultaneously drive the support column to move, so that the support column is pressed against the outer surface of the reinforcing rib, so that the support column and the reinforcing rib are arranged in a cross shape, thereby improving the strength between the ventilation and heating pipe and the reinforcing rib, and making it more convenient to use.

[0016] Preferably, a limiting column is provided on the outer surface of the second insulation board; a groove adapted to the limiting column is opened on the surface of the second insulation board; the limiting column is provided to limit the second insulation board, thereby facilitating the movement of the second insulation board on the axis, which is more convenient to use.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The ventilation heating pipe for tunnel construction in high-altitude and cold areas described in the present invention is conducive to increasing the temperature in the tunnel through the use of this ventilation heating pipe; ensuring the construction environment temperature in the tunnel construction area, increasing the strength of the initial support sprayed concrete, lining concrete, inverted arch and inverted arch filling concrete, creating a good construction temperature environment, and avoiding the freezing of groundwater due to low temperature, which causes the initial support to frost heave, deform and crack, and form a safety hazard; and it can heat the entire area in the tunnel, making it more convenient to use.

[0019] 2. The ventilation and heating pipe for tunnel construction in high-altitude and cold areas described in the present invention moves toward the side close to the first insulation plate through the second insulation plate, and then the first insulation plate and the second insulation plate are fitted together, which can further improve the thermal insulation performance of the ventilation and heating pipe, thereby effectively reducing the heat energy loss of the ventilation and heating pipe and bringing convenience to the increase of the temperature in the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 is a three-dimensional diagram of the air duct of the present invention;

[0022] Figure 2 is a cross-sectional view of the air duct of the present invention;

[0023] Figure 3 In the present invention Figure 2 A magnified view of the structure at point A;

[0024] Figure 4 In the present invention Figure 2 A magnified view of the structure at point B;

[0025] Figure 5 In the present invention Figure 3 A magnified view of the structure at point C;

[0026] Figure 6 It is a schematic diagram of the limiting column structure of the second embodiment of the present invention.

[0027] In the figure: 1. air duct; 2. ventilator; 3. ventilation heating pipe; 4. electric heating pipe; 5. air inlet; 6. air outlet; 7. limit block; 8. pull rod; 9. holder; 10. tension spring; 11. slot; 12. support rod; 13. reinforcing rib; 14. first insulation board; 15. sliding board; 16. arc seat; 17. second insulation board; 18. holder; 19. arc slot; 20. support column; 21. limit column. DETAILED DESCRIPTION

[0028] 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 implementation methods.

[0029] Example 1

[0030] like Figures 1 to 3 As shown, the embodiment of the present invention describes a ventilation and heating pipe for tunnel construction in high-altitude and cold areas, comprising an air duct 1; a ventilator 2 is fixedly connected to the outer surface of the air duct 1; a ventilation and heating pipe 3 is provided on the outer surface of the air duct 1 and on the side away from the ventilator 2; an electric heating pipe 4 is fixedly connected to the interior of the ventilation and heating pipe 3; a plurality of electric heating pipes 4 are provided, and are arranged in a linear array inside the ventilation and heating pipe 3; an air inlet 5 and an air outlet 6 are fixedly connected to the left and right ends of the ventilation and heating pipe 3 respectively; the shape of the air inlet 5 is a conical air outlet that gradually becomes larger from the inside to the outside; the shape of the air outlet 6 is a conical air outlet that gradually becomes smaller from the inside to the outside; when working, this air duct 1 is first pre-installed at a suitable position in the tunnel, and then an external controller controls the electric heating pipe 4 in the ventilation and heating pipe 3 to start heating, and controls the ventilation and heating pipe 3 The fan 2 draws the cold air in the tunnel from the air inlet 5 into the interior of the ventilation heating pipe 3. Through the continuous heating of the electric heating pipe 4, the cold air can be gradually converted into hot air, and then transmitted to the tunnel through the air duct 1. Since the shape of the air inlet 5 is a tapered air outlet that gradually becomes larger from the inside to the outside; the shape of the air outlet 6 is a tapered air outlet that gradually becomes smaller from the inside to the outside; the amount of air drawn in and released can be large, which is beneficial to the increase of the temperature in the tunnel; the construction environment temperature in the tunnel construction area is ensured, and the strength of the initial support sprayed concrete, lining concrete, inverted arch and inverted arch filling concrete is increased, creating a good construction temperature environment, avoiding the freezing of groundwater due to low temperature, causing the initial support to frost heave, causing the initial support to deform and crack, and forming a safety hazard; and the entire area in the tunnel can be heated, which is more convenient to use.

[0031] like Figures 2 to 4As shown, the width of the ventilation and heating pipe 3 is smaller than the width of the air duct 1; the upper and lower sides of the ventilation and heating pipe 3 are fixedly connected to the limiting blocks 7; the shape of the limiting blocks 7 is concave; a pull rod 8 is provided inside the air duct 1; the side of the pull rod 8 close to the limiting block 7 is fixedly connected to the holder 9; the outer surface of the pull rod 8 is fixedly connected to the tension spring 10; during operation, when the ventilation and heating pipe 3 and the limiting block 7 on its surface move to one side of the pull rod 8, the staff manually pulls the pull rod 8, and then the pull rod 8 drives the holder 9 to move, and makes the tension spring 10 compressed. When the limiting block 7 and the holder 9 are on the same vertical plane, the pull rod 8 is released, and under the recovery of the tension spring 10, the holder 9 will be stuck in the concave limiting block 7, so that the ventilation and heating pipe 3 is stably installed. It is more convenient to use and can facilitate the installation of the ventilation and heating pipe 3.

[0032] The outer surface of the air duct 1 is provided with a sliding groove adapted to the pull rod 8; the number of the pull rods 8 is set to be multiple; and they are arranged at equal distances on the outer surface of the air duct 1; a plurality of pull rods 8 are arranged in a transverse direction, and the installation position of the ventilation and heating pipe 3 on the air duct 1 can be adjusted accordingly according to specific needs.

[0033] The outer surface of the limit block 7 is provided with a slot 11; the outer surface of the holder 9 is rotatably connected to a support rod 12; the shape of the slot 11 is adapted to the shape of the support rod 12; during operation, when the holder 9 is stuck in the limit block 7, the support rod 12 on the outer surface of the holder 9 will gradually be stuck in the slot 11 on the surface of the limit block 7, which can improve the stability of the ventilation and heating pipe 3, facilitate its heating in the tunnel, and make it more convenient to use.

[0034] The ventilation and heating pipes 3 are fixedly connected with reinforcing ribs 13; there are multiple reinforcing ribs 13, and different reinforcing ribs 13 are arranged in a cross shape; when working, the reinforcing ribs 13 are provided on the outer surface of the ventilation and heating pipes 3, which can improve the strength of the ventilation and heating pipes 3 and reduce the deformation during use.

[0035] like Figures 2 to 5As shown, the inner wall of the ventilation and heating pipe 3 is fixedly connected to the first insulation plate 14; a sliding plate 15 is provided inside the ventilation and heating pipe 3; the upper and lower sides of the sliding plate 15 are fixedly connected to an arc seat 16; a second insulation plate 17 is provided inside the ventilation and heating pipe 3; the outer surface of the second insulation plate 17 is arc-shaped near the arc seat 16; during operation, the staff manually pushes the sliding plate 15 so that the sliding plate 15 drives the arc seats 16 on the upper and lower sides to move, and then the arc seat 16 will contact the side surfaces of the second insulation plate 17 and squeeze the arc surface of the second insulation plate 17 to move the second insulation plate 17 to the side close to the first insulation plate 14, and then the first insulation plate 14 and the second insulation plate 17 fit together, which can further improve the insulation performance of this ventilation and heating pipe 3, effectively reduce the heat energy loss of the ventilation and heating pipe 3, and bring convenience to the temperature increase in the tunnel.

[0036] The outer surface of the second insulation board 17 is provided with a clamping block 18; the outer surface of the first insulation board 14 is provided with an arc groove 19; the shape of the clamping block 18 is adapted to the shape of the arc groove 19; during operation, when the second insulation board 17 moves, the second insulation board 17 will simultaneously drive the clamping block 18 to move, and the clamping block 18 will then be pressed into the arc groove 19 on the surface of the first insulation board 14, thereby stably combining the first insulation board 14 and the second insulation board 17.

[0037] The first insulation board 14 and the second insulation board 17 are both composed of high-temperature resistant asbestos cloth, silicone cloth, aluminum foil glass fiber cloth and high-aluminum aluminum silicate wool paved from the inside to the outside or from the outside to the inside. The high-temperature resistant asbestos cloth has a heat-insulating effect, the silicone cloth has an insulating effect, the aluminum foil glass fiber cloth has a flame-retardant effect, and the high-aluminum aluminum silicate wool has a heat-insulating effect, which greatly improves the performance of this ventilation and heating pipe 3.

[0038] The outer surface of the sliding plate 15 is fixedly connected to the support column 20. During the movement of the sliding plate 15, the sliding plate 15 will simultaneously drive the support column 20 to move, so that the support column 20 is pressed against the outer surface of the reinforcing rib 13, so that the support column 20 and the reinforcing rib 13 are arranged in a cross shape, thereby improving the strength between the ventilation and heating pipe 3 and the reinforcing rib 13 and making it more convenient to use.

[0039] Example 2

[0040] like Figure 6 As shown, compared with Example 1, another embodiment of the present invention is: a limiting column 21 is provided on the outer surface of the second insulation board 17; a groove adapted to the limiting column 21 is opened on the surface of the second insulation board 17; the limiting column 21 is provided to limit the second insulation board 17, thereby facilitating the movement of the second insulation board 17 on the axis, which is more convenient to use.

[0041] During operation, the air duct 1 is pre-installed at a suitable position in the tunnel, and then the external controller controls the electric heating tube 4 in the ventilation heating tube 3 to start heating, and controls the ventilator 2 to draw the cold air in the tunnel from the air inlet 5 into the interior of the ventilation heating tube 3. Through the continuous heating of the electric heating tube 4, the cold air can gradually become hot air, and then be transmitted to the tunnel through the air duct 1. Moreover, since the shape of the air inlet 5 is a tapered air outlet that gradually becomes larger from the inside to the outside; the shape of the air outlet 6 is a tapered air outlet that gradually becomes smaller from the inside to the outside; the air volume drawn in and released can be larger, which is beneficial to the increase of the temperature in the tunnel; ensuring the construction environment temperature in the tunnel construction area, for the initial support of shotcrete, lining concrete, inverted arch and inverted arch filling The increased strength of concrete creates a good construction temperature environment, avoiding the freezing of groundwater due to low temperature, which causes the initial support to frost heave and deformation and cracking of the initial support, posing a safety hazard; and it can heat up the entire area inside the tunnel, making it more convenient to use; when the ventilation and heating pipe 3 and the limit block 7 on its surface move to one side of the pull rod 8, the staff manually pulls the pull rod 8, and then the pull rod 8 drives the holder 9 to move, and makes the tension spring 10 compressed. When the limit block 7 and the holder 9 are on the same vertical plane, the pull rod 8 is released, and under the recovery of the tension spring 10, the holder 9 will be stuck in the concave limit block 7, and the ventilation and heating pipe 3 is stably installed. It is more convenient to use and can facilitate the installation of the ventilation and heating pipe 3.

[0042] A plurality of pull rods 8 arranged in a transverse direction are provided, and the installation position of the ventilation and heating pipe 3 on the air duct 1 can be adjusted accordingly according to specific needs; when the holder 9 is stuck in the limit block 7, the supporting rod 12 on the outer surface of the holder 9 will gradually be stuck in the groove 11 on the surface of the limit block 7, which can improve the stability of the ventilation and heating pipe 3, facilitate its heating in the tunnel, and make it more convenient to use; reinforcing ribs 13 are provided on the outer surface of the ventilation and heating pipe 3, which can improve the self-strength of the ventilation and heating pipe 3 and reduce its deformation during use; the staff manually pushes the sliding plate 15 so that the sliding plate 15 drives the arc seats 16 on the upper and lower sides to move, and then The rear arc-shaped seat 16 will contact the side surface of the second insulation plate 17 and squeeze the arc-shaped surface of the second insulation plate 17, so that the second insulation plate 17 moves toward the side close to the first insulation plate 14. After that, the first insulation plate 14 and the second insulation plate 17 fit together, which can further improve the insulation performance of the ventilation and heating pipe 3, effectively reducing the heat energy loss of the ventilation and heating pipe 3, and bringing convenience to the temperature increase in the tunnel; during the movement of the second insulation plate 17, the second insulation plate 17 will simultaneously drive the block 18 to move, and the block 18 will then be pressed against the arc groove 19 on the surface of the first insulation plate 14, so as to stably combine the first insulation plate 14 and the second insulation plate 17.

[0043] During the movement of the sliding plate 15, the sliding plate 15 will simultaneously drive the support column 20 to move, so that the support column 20 is pressed against the outer surface of the reinforcing rib 13, so that the support column 20 and the reinforcing rib 13 are arranged in a cross shape, thereby improving the strength between the ventilation and heating pipe 3 and the reinforcing rib 13; a limiting column 21 is provided to limit the second insulation plate 17, thereby facilitating the movement of the second insulation plate 17 on the axis, which is more convenient to use.

[0044] The above-mentioned front, back, left, right, up and down are all based on the Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0046] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A ventilation and heating pipe for tunnel construction in high-altitude and cold areas, characterized by: The invention comprises an air duct (1); the outer surface of the air duct (1) is fixedly connected to a ventilator (2); a ventilation heating pipe (3) is provided on the outer surface of the air duct (1) and on a side away from the ventilator (2); an electric heating pipe (4) is fixedly connected to the interior of the ventilation heating pipe (3); a plurality of electric heating pipes (4) are provided and arranged in a linear array inside the ventilation heating pipe (3); an air inlet (5) and an air outlet (6) are fixedly connected to the left and right ends of the ventilation heating pipe (3), respectively; the shape of the air inlet (5) is a tapered air outlet that gradually increases in size from the inside to the outside; the shape of the air outlet (6) is a tapered air outlet that gradually decreases in size from the inside to the outside; The width of the ventilation and heating pipe (3) is smaller than the width of the air duct (1); the upper and lower sides of the ventilation and heating pipe (3) are fixedly connected to limit blocks (7); the limit blocks (7) are concave in shape; a pull rod (8) is provided inside the air duct (1); a clamping seat (9) is fixedly connected to the side of the pull rod (8) close to the limit block (7); a tension spring (10) is fixedly connected to the outer surface of the pull rod (8); The outer surface of the air duct (1) is provided with a sliding groove adapted to the pull rod (8); the pull rods (8) are provided in a plurality and are arranged at equal distances on the outer surface of the air duct (1); The outer surface of the limit block (7) is provided with a slot (11); the outer surface of the holder (9) is rotatably connected to a support rod (12); the shape of the slot (11) is adapted to the shape of the support rod (12).

2. The ventilation and heating pipe for tunnel construction in high-altitude and cold regions according to claim 1, characterized in that: Reinforcement ribs (13) are fixedly connected between the ventilation and heating pipes (3); the number of the reinforcement ribs (13) is set to be multiple.

3. The ventilation and heating pipe for tunnel construction in high-altitude and cold regions according to claim 1, characterized in that: The inner wall of the ventilation and heating pipe (3) is fixedly connected to a first insulation plate (14); a sliding plate (15) is provided inside the ventilation and heating pipe (3); an arc-shaped seat (16) is fixedly connected to the upper and lower sides of the sliding plate (15); a second insulation plate (17) is provided inside the ventilation and heating pipe (3); the outer surface of the second insulation plate (17) is in an arc shape on the side close to the arc-shaped seat (16).

4. The ventilation and heating pipe for tunnel construction in high-altitude and cold regions according to claim 3, characterized in that: The outer surface of the second heat-insulating plate (17) is provided with a clamping block (18); the outer surface of the first heat-insulating plate (14) is provided with an arc-shaped groove (19); the shape of the clamping block (18) is adapted to the shape of the arc-shaped groove (19).

5. The ventilation and heating pipe for tunnel construction in high-altitude and cold regions according to claim 3, characterized in that: The first insulation board (14) and the second insulation board (17) are both composed of high-temperature resistant asbestos cloth, silicone cloth, aluminum foil fiberglass cloth and high-aluminum aluminum silicate wool paved from the inside to the outside or from the outside to the inside.

6. The ventilation and heating pipe for tunnel construction in high-altitude and cold regions according to claim 3, characterized in that: A support column (20) is fixedly connected to the outer surface of the sliding plate (15).

7. The ventilation and heating pipe for tunnel construction in high-altitude and cold regions according to claim 4, characterized in that: The outer surface of the second heat-insulating plate (17) is provided with a limiting column (21); and the surface of the second heat-insulating plate (17) is provided with a groove adapted to the limiting column (21).

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