A subgrade anti-settlement system in permafrost regions

Abstract

The present invention provides a subgrade settlement prevention system in permafrost regions, which relates to the technical field of geotechnical engineering and includes: a plurality of heat dissipation rods inserted on both sides of a highway subgrade; the heat dissipation rods include a first section, a second section, and a third section connected in sequence from top to bottom, and have a first cavity, a second cavity, and a third cavity respectively; the top end of the second section is slidably connected to the first cavity from the bottom opening of the first section, and the first cavity, the second cavity, and the third cavity communicate with each other to form a liquid storage space; the bottom end of the first section has a plurality of arc-shaped pressing pieces extending downward and arranged at intervals in the circumferential direction, the arc-shaped pressing pieces are pressed against the outer wall of the second section, and the outer wall of the arc-shaped pressing pieces has an external thread; the heat dissipation rod further includes a locking sleeve; from top to bottom, at least a part of the locking sleeve has a gradually decreasing diameter, and the inner wall of the locking sleeve has an internal thread corresponding to the external thread, and by rotating the locking sleeve, the locking sleeve can press the arc-shaped pressing pieces inward against the outer wall of the second section.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical engineering, and particularly to a subgrade anti-settlement system in permafrost regions. Background Art

[0002] In alpine and high-altitude regions, the temperature difference between day and night is large. Permafrost can be divided into two layers: the upper layer is the active layer that freezes in winter and thaws in summer, and the lower layer is the permafrost layer that does not thaw for many years. Therefore, in terms of soil state, the active layer is the most active, and its performance state is divided into two types. These two active states generally change with the temperature. For example, when the temperature is high, the active layer thaws to a certain thickness, and when the temperature is low, the active layer freezes again. The repeated freezing and expansion and melting and contraction of water in the active layer will cause damage and disturbance between the soil mass and the rock mass, and even cause deformation and displacement. The direct result of repeated freezing and expansion is subgrade deformation, or the subgrade rises or sinks, ultimately affecting driving safety.

[0003] The prior art uses laying block stones, crushed stones, etc. There will be gaps between these stones, and then a shielding effect will be formed in summer, and air convection will occur in winter. Obviously, this uses the excellent heat conduction ratio of gas to solve the problem. However, this method has the problem of poor maintenance, and moreover, for active layers of different thicknesses, the adjustment ability cannot be adjusted. Summary of the Invention

[0004] The purpose of the present invention is to provide a subgrade anti-settlement system in permafrost regions to alleviate the technical problem that the existing subgrade in permafrost regions cannot flexibly adjust the temperature according to the thickness of the active area, resulting in subgrade deformation.

[0005] In a first aspect, a subgrade anti-settlement system in permafrost regions provided by an embodiment of the present invention includes: a plurality of heat dissipation rods inserted on both sides of a highway subgrade;

[0006] The heat dissipation rod includes a first section, a second section, and a third section connected in sequence from top to bottom;

[0007] The first section has a first cavity, the second section has a second cavity, and the third section has a third cavity;

[0008] The top end of the second section is slidably connected to the first cavity from the bottom opening of the first section, and the first cavity, the second cavity, and the third cavity are connected to each other to form a liquid storage space, and a phase change liquid is stored in the liquid storage space;

[0009] The bottom end of the first section has a plurality of arc-shaped pressing pieces extending downward and arranged at intervals in the circumferential direction. The arc-shaped pressing pieces are pressed against the outer wall of the second section, and the outer wall of the arc-shaped pressing piece has an external thread;

[0010] The heat dissipation rod further includes a locking sleeve; from top to bottom, at least a part of the locking sleeve has a gradually decreasing diameter, and the inner wall of the locking sleeve has an internal thread corresponding to the external thread. By rotating the locking sleeve, the locking sleeve can press the arc-shaped pressing piece inward against the outer wall of the second section.

[0011] Further, a guiding groove extending vertically is provided on the inner wall of the first cavity.

[0012] A sealing ring is provided at the top end of the second section. The circumferential outer wall of the sealing ring contacts the inner wall of the first cavity, and a first sealing guide block slidably connected to the guiding groove is provided on the circumferential outer side wall of the sealing ring.

[0013] Further, a sealing ring protruding radially outward and located inside the first cavity is provided on the outer wall of the second section. The circumferential outer wall of the sealing ring contacts the inner wall of the first cavity; a second sealing guide block slidably connected to the guiding chute is provided on the circumferential outer wall of the sealing ring.

[0014] Further, a liquid injection assembly is provided on the outer surface of the second section. The liquid injection assembly includes a liquid injection pipe. One end of the liquid injection pipe communicates with the inside of the second cavity and extends downward; a control valve is provided at the other end of the liquid injection pipe.

[0015] Further, a limiting portion protruding radially outward is provided at the bottom of the arc-shaped pressing piece to prevent the locking sleeve from detaching from the arc-shaped pressing piece.

[0016] Further, a plurality of heat dissipation rods are provided on the first section, and each heat dissipation rod has a plurality of heat dissipation fins.

[0017] Further, a plurality of support rods extending outward are provided on the outer wall of the third section.

[0018] Further, a light sensor is provided on the outer wall of the third section for detecting the brightness level.

[0019] A signal sending device is further provided on the first section. The signal sending device is connected to the light sensor and is used to send an alarm signal when the brightness value detected by the light sensor reaches a preset value.

[0020] A solar charging device is further provided on the first section. The solar charging device is respectively connected to the signal sending device and the light sensor through wires.

[0021] Further, a voice alarm is included. The voice alarm is respectively connected to the light sensor and the solar charging device through wires, and the voice alarm is provided on the first section.

[0022] The voice alarm is used to emit an alarm prompt voice when the brightness value detected by the light sensor reaches a preset value.

[0023] Further, the wire passes through the liquid storage space.

[0024] The subgrade anti-settlement system in permafrost regions provided by the embodiments of the present invention includes: a plurality of heat dissipation rods inserted on both sides of the highway subgrade; the heat dissipation rods include a first section, a second section, and a third section connected in sequence from top to bottom; and a first cavity is provided in the first section, a second cavity is provided in the second section, and a third cavity is provided in the third section; the top end of the second section is slidably connected to the second cavity from the bottom opening of the first section, and the first cavity, the second cavity, and the third cavity are communicated with each other to form a liquid storage space, and a phase change liquid is stored in the liquid storage space; the bottom end of the first section has a plurality of arc-shaped pressing pieces extending downward and arranged at intervals in the circumferential direction, the arc-shaped pressing pieces are pressed against the outer wall of the second section, and external threads are provided on the outer walls of the arc-shaped pressing pieces; the heat dissipation rod further includes a locking sleeve; from top to bottom, at least a part of the locking sleeve has a gradually decreasing diameter, and internal threads corresponding to the external threads are provided on the inner wall of the locking sleeve, and by rotating the locking sleeve, the locking sleeve can press the arc-shaped pressing pieces inward against the outer wall of the second section. In this embodiment, the heat dissipation rods are arranged on both sides of the subgrade. Among them, the first section of the heat dissipation rod is above the ground, most of the second section is in the active layer, and a small part of the second section and all of the third section are in the permafrost layer. The heat dissipation rod in this embodiment can change the length of the second section exposed outside by telescoping the second section, and can also change the total length of the heat dissipation rod. According to different geological conditions and different soil layer thicknesses, the length of the second section can be controlled by the locking sleeve. Before adjustment, first rotate the locking sleeve to separate the part with a smaller diameter on the locking sleeve from the arc-shaped pressing piece, then telescope the second section to a suitable length, and then tighten the locking sleeve so that the position with a smaller diameter on the locking sleeve presses the arc-shaped pressing piece until the arc-shaped pressing piece is clamped tightly on the outer wall of the second section, and the length of the heat dissipation rod is fixed, and then bury the heat dissipation rod; a phase change liquid is provided in the liquid storage space. In the case of a large temperature difference between day and night in plateau areas, when the temperature is low at night, gaseous ammonia condenses from gas into liquid and releases heat to the active layer, and when the temperature is high during the day, the phase change liquid evaporates into gas and absorbs heat from the active layer. The above process ensures that the temperature of the active layer is constant, does not cause the active layer to freeze and expand and melt and shrink repeatedly, ensures that the subgrade does not settle, and ensures driving safety. Brief Description of the Drawings

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 Schematic diagram of the overall structure of the subgrade anti-settlement system in the frozen soil area provided in Embodiment 1 of the present invention;

[0027] Figure 2 Schematic diagram of the heat dissipation rod of the subgrade anti-settlement system in the frozen soil area provided in Embodiment 1 of the present invention;

[0028] Figure 3 For Figure 2 Partial explosion view of position A in

[0029] Figure 4 For Figure 3 Explosion view of the lower end of the third section in

[0030] Figure 5 For Figure 2 Partial explosion view of position B in

[0031] Figure 6 For Figure 2 Partial explosion view of position C in

[0032] Figure 7 Schematic diagram of the anti-theft mechanism on the heat dissipation rod of the subgrade anti-settlement system in the frozen soil area provided in Embodiment 2 of the present invention.

[0033] Icon: 1 - heat dissipation rod; 101 - first section; 1011 - sealing ring; 1012 - first sealing guide block; 102 - second section; 1021 - liquid storage space; 1022 - guide groove; 103 - third section; 1031 - heat dissipation rod; 1032 - heat dissipation fin; 201 - limiting part; 202 - arc-shaped pressing piece; 301 - control valve; 302 - liquid injection pipe; 4 - locking sleeve; 5 - sealing ring; 51 - second sealing guide block; 7 - highway subgrade; 8 - active layer; 9 - permafrost layer;

[0034] 61 - light sensor; 62 - signal sending device; 63 - solar charging device; 64 - voice alarm. Detailed implementation manners

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Embodiment 1

[0037] As Figures 1-6 shown, the subgrade settlement prevention system in the frozen soil area provided by the embodiment of the present invention includes a plurality of heat dissipation rods 1 inserted on both sides of the highway subgrade 7. A plurality of heat dissipation rods 1 are arranged on each side of the highway subgrade 7. A part of the heat dissipation rod 1 is inserted below the bottom surface, and a part is exposed above the ground. The heat dissipation rod 1 realizes heat exchange with the ground and the external air.

[0038] The heat dissipation rod includes a first section 101, a second section 102, and a third section 103 connected in sequence from top to bottom. The first section 101, the second section 102, and the third section 103 are all rod-shaped. And the first section 101 has a first cavity, the second section 102 has a second cavity, the third section 103 has a third cavity, and the first cavity, the second cavity, and the third cavity are connected to each other to form a liquid storage space 1021. The liquid storage space 1021 is used to store a phase change liquid, such as ammonia, nitrogen, freon, carbon dioxide, propane, etc.

[0039] As Figure 3 shown, the bottom end surface of the first section 101 has through holes. The top end of the second section 102 is slidably connected to the first cavity from the bottom opening of the first section 101. When the active layer 8 is relatively thin, a part of the second section 102 can be retracted into the first section 101, and when the active layer is relatively thick, a part of the second section 102 can be extended from the first section 101 to match the actual thickness of the active layer 8. On the one hand, the second section 102 can completely cover the active layer 8, and the third end can be deeply inserted into the permafrost layer 9 to improve stability; on the other hand, for the position where the active layer 8 is relatively thin, after the overall length of the heat dissipation rod 1 is reduced, the difficulty of burying the heat dissipation rod 1 can be reduced, and the length of the part exposed above the ground can also be reduced to avoid damage to the heat dissipation rod 1 caused by the wind.

[0040] The bottom end of the first section 101 has a plurality of arc-shaped pressing pieces 202 extending downward and arranged at intervals in the circumferential direction. The arc-shaped pressing pieces 202 surround the outside of the second section 102, and there is a margin gap between adjacent two arc-shaped pressing pieces 202 to provide a deformation space when the arc-shaped pressing pieces 202 tightly hold the second section 102 inward.

[0041] The outer wall of the arc-shaped pressing piece 202 has an external thread. The heat dissipation rod 1 further includes a locking sleeve 4. A part of the locking sleeve 4 is cylindrical and a part is conical. From top to bottom, the diameter of the conical part of the locking sleeve 4 gradually decreases. The inner wall of the cylindrical part of the locking sleeve 4 has an internal thread corresponding to the external thread. By rotating the locking sleeve 4, the locking sleeve 4 can press the arc-shaped pressing piece 202 inward against the outer wall of the second section 102.

[0042] The beneficial effects and inferences of this embodiment are as follows: The heat dissipation rods 1 are arranged on both sides of the roadbed. Among them, the first section 101 of the heat dissipation rod 1 is above the ground, most of the second section 102 is located in the active layer 8, and a small part of the second section 102 and all of the third part are located in the permafrost layer 9. The heat dissipation rod 1 in this embodiment can change the length of the second section 102 exposed outside by telescoping the second section 102, and can also change the total length of the heat dissipation rod 1. According to different geological conditions and different soil layer thicknesses, the length of the second section 102 can be controlled by the locking sleeve 4. Before adjustment, first rotate the locking sleeve 4 to separate the smaller-diameter part of the locking sleeve 4 from the arc-shaped pressing piece 202, then telescope the second section 102 to an appropriate length, and then tighten the locking sleeve 4 so that the position with a smaller diameter on the locking sleeve 4 presses the arc-shaped pressing piece 202 until the arc-shaped pressing piece 202 is clamped tightly on the outer wall of the second section 102, and the length of the heat dissipation rod 1 is fixed. After the heat dissipation rod 1 is buried; there is a phase change liquid in the liquid storage space 1021. In the case of a large temperature difference between day and night in the plateau area, at night when the temperature is low, gaseous ammonia condenses from gas into liquid and releases heat to the active layer 8. During the day when the temperature is high, the phase change liquid evaporates into gas and absorbs heat from the active layer 8. The above process ensures that the temperature of the active layer 8 is constant, and will not cause the active layer 8 to freeze and expand and melt and shrink repeatedly, ensuring that the roadbed does not settle and ensuring driving safety.

[0043] As Figure 4 As shown, a guiding groove 1022 extending vertically is provided on the inner wall of the first cavity. The number of guiding grooves 1022 can be multiple, such as three. A sealing ring 1011 is provided at the top end of the second section 102. The sealing ring 1011 can be made of an elastic material, such as rubber, etc. The circumferential outer wall of the sealing ring 1011 contacts the inner wall of the first cavity and forms a seal. A first sealing guide block 1012 slidably connected to the guiding groove 1022 is provided on the circumferential outer side wall of the sealing ring 1011, and the outer wall of the first sealing guide block 1012 also contacts the inner wall of the guiding groove 1022 to form a seal, thereby avoiding air leakage between the first section 101 and the second section 102 when the second section 102 slides relative to the first section 101.

[0044] As Figure 3As shown in the figure, in order to further reduce leakage, a sealing ring 5 is provided on the outer wall of the second section 102, which protrudes radially outward and is located inside the first cavity. Axially, the number of sealing rings 5 can be at least two. The circumferential outer wall of the sealing ring 5 contacts the inner wall of the first cavity and seals the gap therebetween; a second sealing guide block 51 slidably connected to the guiding chute is provided on the circumferential outer wall of the sealing ring 5, and the gap therebetween is sealed. Layered protection reduces gas leakage.

[0045] As Figure 5 shown in the figure, after long-term use, there will be a problem of insufficient gas. A liquid injection component is provided on the outer surface of the second section 102. The liquid injection component includes a liquid injection pipe 302. One end of the liquid injection pipe 302 communicates with the inside of the second cavity, and this end extends downward. The liquid gradually fills from bottom to top. A control valve 301 is provided at the other end of the liquid injection pipe 302. It is opened during liquid injection and closed after the liquid injection tool is removed. It is convenient to regularly supplement the liquid of the phase change liquid and ensure the long-term effectiveness of the anti-settlement system.

[0046] As Figure 4 shown in the figure, the bottom of the arc-shaped pressing piece 202 has a limiting portion 201 that protrudes radially outward. The limiting portion 201 can be perpendicular to the arc-shaped pressing piece. The locking sleeve 4 is located above it. When the locking sleeve 4 moves up and down, the limiting portion 201 is used to prevent the locking sleeve 4 from detaching from the arc-shaped pressing piece 202.

[0047] As Figure 6 shown in the figure, in order to increase heat dissipation, a plurality of heat dissipation rods 1031 are provided on the first section 101. In this embodiment, the number of heat dissipation rods 1031 is two. Each heat dissipation rod 1031 has a plurality of heat dissipation fins 1032. The fins are circular rings and are arranged at intervals along the length direction of the heat dissipation rod 1031, achieving the purpose of increasing the heat exchange area.

[0048] In order to increase the stability of burial, in other embodiments, a plurality of support rods (not shown in the drawings) extending outward can be provided on the outer wall of the third section 103 to prevent the heat dissipation rod 1 from tilting and the heat dissipation rod 1 is not easily pulled out.

[0049] Embodiment 2

[0050] As Figure 7As shown, the difference from Embodiment 1 is that in this embodiment, the heat dissipation rod 1 has an anti-theft function. A light sensor 61 is provided on the outer wall of the third section 103 for detecting the brightness level. After the heat dissipation rod 1 is buried, the brightness detected by the light sensor 61 is at the lowest value. When the heat dissipation rod 1 is taken out of the soil, the brightness value detected by the light sensor 61 rises to a preset value. At this time, the signal sending device 62 on the first section 101 emits an alarm signal. For example, it sends an alarm message to the manager's mobile phone or computer to prompt the manager that someone is stealing the heat dissipation rod 1. A solar charging device 63 is also provided on the first section 101. The solar charging device 63 belongs to the prior art. The solar charging device 63 is respectively connected to the signal sending device 62 and the light sensor 61 through wires to provide power support for the anti-theft mechanism.

[0051] Furthermore, it further includes a voice alarm 64, such as a speaker. The voice alarm 64 is respectively connected to the light sensor 61 and the solar charging device 63 through wires. The voice alarm 64 is provided on the first section 101. The voice alarm 64 is used to emit an alarm prompt voice when the brightness value detected by the light sensor 61 reaches the preset value. The voice alarm and the alarm signal are emitted simultaneously. At this time, the voice alarm can play a role in deterring thieves and preventing theft.

[0052] The wire passes through the liquid storage space 1021 to reduce the exposure of the wire and prevent criminals from cutting the wire.

[0053] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A permafrost area roadbed anti-settlement system, characterized in that: include: A plurality of heat dissipation rods (1) inserted on both sides of the roadbed (7); The heat dissipation rod (1) comprises a first section (101), a second section (102) and a third section (103) which are sequentially connected from top to bottom; The first section (101) has a first cavity, the second section (102) has a second cavity, and the third section (103) has a third cavity; The top end of the second section (102) is slidably connected to the first cavity from the bottom end opening of the first section (101), and the first cavity, the second cavity and the third cavity are connected to each other to form a liquid storage space (1021), and the liquid storage space (1021) is used to store phase change liquid; The bottom end of the first section (101) has a plurality of arc-shaped compression pieces (202) extending downward and spaced apart in the circumferential direction, the arc-shaped compression pieces (202) are pressed onto the outer wall of the second section (102), and the outer wall of the arc-shaped compression piece (202) has an external thread; The heat sink (1) further comprises a locking sleeve (4); from top to bottom, the locking sleeve (4) has at least a portion whose diameter gradually decreases, and the inner wall of the locking sleeve (4) has an internal thread corresponding to the external thread, and by rotating the locking sleeve (4), the locking sleeve (4) can press the arc-shaped pressing piece (202) inward onto the outer wall of the second section (102); A guide groove (1022) extending vertically is provided on the inner wall of the first cavity; A sealing ring (1011) is provided at the top end of the second section (102), the circumferential outer wall of the sealing ring (1011) contacts the inner wall of the first cavity, and a first sealing guide block (1012) is provided on the circumferential outer wall of the sealing ring (1011) and is slidably connected to the guide groove (1022); A sealing ring (5) is provided on the outer wall of the second section (102) and protrudes radially outward and is located in the first cavity, and the circumferential outer wall of the sealing ring (5) contacts the inner wall of the first cavity; a second sealing guide block (51) is provided on the circumferential outer wall of the sealing ring (5) and is slidably connected to the guide groove; A light sensor (61) is provided on the outer wall of the third section (103) for detecting the degree of light and darkness; The first section (101) is also provided with a signal sending device (62), which is connected to the light sensor (61) and is used to send an alarm signal when the brightness value detected by the light sensor (61) reaches a preset value; The first section (101) is also provided with a solar charging device (63), and the solar charging device (63) is respectively connected to the signal sending device (62) and the light sensor (61) via wires; It also includes a voice alarm (64), which is connected to the light sensor (61) and the solar charging device (63) via wires, and is arranged on the first section (101); The voice alarm (64) is used to issue an alarm voice when the brightness value detected by the light sensor (61) reaches a preset value.

2. The permafrost area roadbed anti-settlement system according to claim 1, characterized in that: The outer surface of the second section (102) is provided with a liquid injection assembly, and the liquid injection assembly includes a liquid injection tube (302), one end of the liquid injection tube (302) is connected to the interior of the second cavity, and the end is in a downward extending state; the other end of the liquid injection tube (302) is provided with a control valve (301).

3. The permafrost area roadbed anti-settlement system according to claim 1, characterized in that: The bottom of the arc-shaped pressing piece (202) has a limiting portion (201) protruding radially outward, which is used to prevent the locking sleeve (4) from detaching from the arc-shaped pressing piece (202).

4. The permafrost region roadbed anti-settlement system according to claim 1, characterized in that: A plurality of heat dissipation rods (1031) are provided on the first section (101), and each heat dissipation rod (1031) has a plurality of heat dissipation fins (1032).

5. The permafrost region roadbed anti-settlement system according to claim 1, characterized in that: A plurality of support rods extending outward are provided on the outer wall of the third section (103).

6. The permafrost region roadbed anti-settlement system according to claim 1, characterized in that: The wire passes through the liquid storage space (1021).

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