CN214063001U - Heat insulation and dissipation supporting structure suitable for high-ground-temperature tunnel - Google Patents
Heat insulation and dissipation supporting structure suitable for high-ground-temperature tunnel Download PDFInfo
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- CN214063001U CN214063001U CN202022322890.1U CN202022322890U CN214063001U CN 214063001 U CN214063001 U CN 214063001U CN 202022322890 U CN202022322890 U CN 202022322890U CN 214063001 U CN214063001 U CN 214063001U
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Abstract
The utility model discloses a heat insulation and radiation support structure suitable for a high ground temperature tunnel, which comprises a primary support concrete layer, a heat insulation leveling layer, a heat insulation waterproof layer and a secondary lining concrete layer which are arranged from outside to inside in sequence; a water circulation pipeline is arranged between the heat insulation leveling layer and the heat insulation waterproof layer; the water circulation device is characterized by further comprising a water tank, wherein a water pump is arranged in the water tank and is communicated with the water circulation pipeline. The utility model uses the sprayed concrete added with the air entraining agent as a primary supporting concrete layer, so that discontinuous closed bubbles are formed inside the sprayed concrete layer, and the heat conductivity coefficient of the concrete layer is reduced; the water circulation system can absorb a large amount of heat in the tunnel construction stage, so that the internal heat of the system is reduced, the burning and cracking of the re-sprayed rigid polyurethane foam heat-insulation waterproof layer foam are avoided, the durability of the rigid polyurethane foam heat-insulation waterproof layer can be effectively prevented from being reduced at a high ground temperature all the year round in the operation stage, and the long-term protection effect on the secondary lining structure is achieved.
Description
Technical Field
The utility model relates to a tunnel engineering technical field, concretely relates to thermal-insulated heat dissipation supporting construction suitable for high ground temperature tunnel.
Background
With the advance of western large development, the construction of railway traffic engineering is indispensable for further promoting the economic culture development in western regions. However, due to the limitation of terrain conditions, a large number of long and extra-long deeply buried tunnels emerge in railway engineering, and particularly, the situation that tunnel engineering needs to pass through high-ground-temperature abnormal zones newly appears.
When the tunnel passes through a high-temperature and high-heat section, a lot of difficulties are brought to construction. The high ground temperature can worsen the working environment in the tunnel, seriously threaten the health and safety of constructors, influence the selection of construction materials, cause the cracking of a lining to influence the durability of a structure and cause the problems of worsening of the working conditions of mechanical equipment, reducing efficiency, increasing faults and the like.
In order to ensure the normal construction and construction quality of the tunnel and the comfort and safety during operation, the influence of high-temperature surrounding rocks on the construction environment and the operation environment in the tunnel is reduced to the maximum extent, and the high-temperature surrounding rocks and the environment in the tunnel need to be relatively isolated. The traditional tunnel supporting structure system does not have a heat insulation function, so that the mold-entering temperature of secondary lining concrete is extremely high, and the later strength and durability of the concrete are reduced; the durability of the waterproof layer is deteriorated, and secondary lining cracking and other problems are caused by temperature stress, so that potential safety hazards during tunnel operation are caused.
At present, the heat dissipation measures aiming at the high ground temperature tunnel generally adopt measures of ventilation, water sprinkling or the combination of ventilation and water sprinkling, or adopt the transportation of ice blocks for cooling. The heat insulation measure for tunnel lining against high ground temperature is generally to apply heat insulation layer or to make high-strength high-temperature-resistant concrete. The method can directly play a role in heat insulation and heat dissipation in construction, but considering that the high ground temperature section where the tunnel is located can still be continuously high in temperature in the later operation period, so that secondary lining concrete is damaged due to temperature stress, cracks and the like, the method not only solves the heat insulation and heat dissipation problem in the construction stage, but also considers the protection of the secondary lining concrete in the operation and maintenance stage for the heat insulation and heat dissipation support structure of the ultra-high temperature tunnel.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a thermal-insulated heat dissipation supporting construction suitable for high ground temperature tunnel for it is not good to solve the thermal-insulated radiating effect of current tunnel lining structure, influences construction stage and operation stage tunnel lining structure bearing capacity and durability scheduling problem.
For solving the technical problem, the utility model discloses the technical scheme who adopts does:
a heat insulation and radiation support structure suitable for a high-ground-temperature tunnel comprises a primary support concrete layer, a heat insulation leveling layer, a heat insulation waterproof layer and a secondary lining concrete layer which are sequentially arranged from outside to inside; a water circulation pipeline is arranged between the heat insulation leveling layer and the heat insulation waterproof layer; the water circulation device is characterized by further comprising a water tank, wherein a water pump is arranged in the water tank and is communicated with the water circulation pipeline.
As a further technical scheme of the scheme, a temperature sensor is arranged on the inner surface of the primary supporting concrete layer; a temperature-sensitive switch is arranged between the water pump and the water circulation pipeline and is communicated with a temperature sensor, and the temperature-sensitive switch can perform switching according to the temperature detected by the temperature sensor.
As a further technical scheme of the scheme, the temperature sensors are uniformly arranged along the cross section of the tunnel, three temperature sensors are arranged on each cross section, and the interval between every two adjacent cross sections is 5 m.
As a further technical scheme of the scheme, the water tank is arranged in a vehicle-avoiding hole in the tunnel.
As a further technical scheme of the scheme, the heat-insulating leveling layer and the heat-insulating waterproof layer are of a rigid polyurethane foam injection layered structure.
As a further technical scheme of the scheme, the thickness of the heat-insulating waterproof layer is 80 mm.
As a further technical scheme of the scheme, the water circulation pipeline comprises a longitudinal water circulation pipeline and an annular water circulation pipeline which are communicated with each other.
As a further technical scheme of the scheme, the longitudinal water circulation pipeline and the annular water circulation pipeline are sequentially connected in an initial position.
As a further technical scheme of the scheme, the longitudinal water circulation pipelines and the annular water circulation pipelines are both made of steel pipes with the diameter of 30-50 mm, and the interval between every two adjacent annular water circulation pipelines is 100 mm.
Compared with the prior art, the utility model, following advantage and beneficial effect have: the sprayed concrete added with the air entraining agent is used as a primary support concrete layer, and discontinuous closed bubbles are formed inside the sprayed concrete layer, so that the heat conductivity coefficient of the concrete layer is reduced; the rigid polyurethane foam plastic is sprayed and foamed on site, has good bonding performance with a base layer, forms a continuous cavity-free structure, does not need an anchor bolt, has no abutted seam and has no influence of a cold and hot bridge; the rigid polyurethane foam plastic has high closed cell rate which is up to more than 95 percent, and excellent heat-insulating and waterproof performance; the rigid polyurethane foam plastic has the advantages of small volume of raw materials, convenient transportation, short construction period and long service life; the water circulation system can absorb a large amount of heat in the tunnel construction stage, so that the internal heat of the system is reduced, the burning and cracking of the re-sprayed rigid polyurethane foam heat-insulation waterproof layer foam are avoided, the durability of the rigid polyurethane foam heat-insulation waterproof layer can be effectively prevented from being reduced at a high ground temperature all the year round in the operation stage, and the long-term protection effect on the secondary lining structure is achieved.
Drawings
Fig. 1 is a schematic cross-sectional structure diagram of the present invention.
Fig. 2 is a schematic diagram of the cross section of the present invention with a partially enlarged structure, corresponding to the left portion in fig. 1.
Fig. 3 is a schematic view of the overall structure of the present invention.
Fig. 4 is an enlarged schematic structural view of the middle water supply system of the present invention.
The explanation of each reference number in the figure is: the wall rock 1, preliminary bracing concrete layer 2, thermal-insulated screed-coat 3, thermal-insulated waterproof layer 4, secondary lining concrete layer 5, temperature sensor 6, longitudinal water circulation pipeline 7, hoop water circulation pipeline 8, water supply pipe 9, keep away car hole 10, water tank 11, water pump 12, temperature sensitive switch 13.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so as to further understand the concept, the technical problems to be solved, the technical features constituting the technical solutions, and the technical effects brought by the technical solutions of the present invention.
It should be understood that the description of these embodiments is illustrative and not restrictive in any way, and that the embodiments described are only some but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, provided in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of preferred embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1-4, a thermal-insulated heat dissipation supporting construction suitable for high ground temperature tunnel include preliminary bracing concrete layer 2, thermal-insulated waterproof system, hydrologic cycle system and secondary lining concrete layer 5.
The surrounding rock 1 is completely covered by the primary support concrete layer 2, and the primary support concrete layer is formed by foam sprayed concrete added with 0.05% of air entraining agent, and the spraying thickness is 150 mm. The air entraining agent is added into the concrete, so that discontinuous closed bubbles are formed in the sprayed concrete, the heat conductivity coefficient is reduced, and the foam concrete is formed. The foam concrete can maintain 80% of the strength at room temperature and 25 ℃ even at a high temperature of 600 ℃, and the common concrete can only maintain 37-40%. The foam concrete can ensure that the mechanical properties of the supporting and lining structure under the high ground temperature condition are not excessively reduced, so as to exert good heat resistance and adaptability under the high ground temperature environment condition; and the foam concrete also has certain waterproof performance, so that the long-term durability of the supporting and lining structure under the severe high-temperature condition is ensured. The foam concrete added with the air entraining agent can reduce the ambient temperature in the tunnel by 2-3 ℃.
The heat-insulating waterproof system is formed by spraying rigid polyurethane foam plastic, is arranged between a primary supporting concrete layer 2 and a secondary lining concrete layer 5, and comprises a heat-insulating leveling layer 3 and a heat-insulating waterproof layer 4. The rigid polyurethane foam plastic is prepared from polyurethane black materials: the polyurethane white material is prepared from the following raw materials in percentage by weight of 1: 1-1.2 volume ratio, and is formed by mixing and spraying the materials by a high-pressure airless sprayer under the condition of pressure higher than 10Mpa, wherein when the temperature of the materials is 20 ℃, the stirring time of the materials is 6 seconds, the milky white time is about 13 seconds, the gel time is about 25 seconds, the non-stick time is about 35 seconds, and the free foaming density is about 26.4kg/m3. The thickness of the heat insulation leveling layer 3 is about 20mm, the heat insulation leveling layer is sprayed on the wall surface of the primary supporting concrete layer 2, the damaged part of the wall surface is finished by cement mortar, the bulge on the wall surface is removed when the thickness is larger than or equal to 10mm, the excessively thick part can be flattened by a handsaw when the flatness seriously exceeds the standard, the wall surface is cleaned, oil stains are cleaned, floating ash is cleaned and the like. The spraying thickness of the heat-insulating waterproof layer 4 is 80 mm.
The water circulation system comprises a water circulation pipeline and a water supply system. The water circulation pipelines are made of steel pipes with the diameter of 30-50 mm and are arranged between the heat insulation leveling layer 3 and the heat insulation waterproof layer 4. The water circulation pipeline comprises a longitudinal water circulation pipeline 7 and two annular water circulation pipelines 8 which are communicated with each other, and the interval between every two adjacent annular water circulation pipelines 8 is 100 mm. The longitudinal water circulation pipeline 7 and the annular water circulation pipeline 8 are sequentially connected in an initial position to ensure the circulation of water in the pipe. The longitudinal water circulation pipeline 7 and the circumferential water circulation pipeline 8 are installed before the heat-insulating waterproof layer 4 is sprayed, and are communicated with a water supply system.
The water supply system comprises a water tank 11 arranged in a vehicle avoiding hole 10 in the tunnel, and the water tank 11 is arranged in the vehicle avoiding hole 10 at one position of the tunnel according to requirements. A water pump 12 is arranged in the water tank 11, and the water pump 12 is communicated with a water circulation pipeline. The water tank 11 is externally connected with a water supply pipeline 9, and the water supply pipeline 9 is pre-embedded in the tunnel and connected to water of rivers and lakes outside the tunnel to realize water source supply of the water tank 11. The water tank 11 has a length of 3.6m, a width of 2.5m, and a height of 3m, and has a water storage volume of 27m3The water tank 11 is not communicated with the tunnel water-proof and drainage system, and hot spring water in a high-ground-temperature area is prevented from entering the water tank 11, so that the temperature of the water tank 11 is increased. With sufficient power for the pump 12, the water supply is up to 1480 linear meters.
The temperature sensors 6 are arranged on the inner surface of the heat insulation leveling layer 3, 3 temperature sensors 6 are arranged on one section, and one section is divided into 5m sections. Be equipped with temperature sensitive switch 13 between water pump 12 and the water circulating pipeline, temperature sensitive switch 13 and the switch-on of temperature sensor 6, temperature sensitive switch 13 can carry out the switch action according to the temperature that temperature sensor 6 detected, when thermal-insulated screed-coat 3 runs into the ultra-temperature, starts water supply system and combines the water circulating pipe to cool down, thereby improves greatly the utility model discloses an degree of automation.
The utility model uses the sprayed concrete added with the air entraining agent as the primary supporting concrete layer 2, so that discontinuous closed bubbles are formed inside the sprayed concrete layer, and the heat conductivity coefficient of the concrete layer is reduced; the rigid polyurethane foam plastic is sprayed and foamed on site, has good bonding performance with a base layer, forms a continuous cavity-free structure, does not need an anchor bolt, has no abutted seam and has no influence of a cold and hot bridge; the rigid polyurethane foam plastic has high closed cell rate which is up to more than 95 percent, and excellent heat-insulating and waterproof performance; the rigid polyurethane foam plastic has the advantages of small volume of raw materials, convenient transportation, short construction period and long service life; the water circulation system can absorb a large amount of heat in the tunnel construction stage, so that the internal heat of the system is reduced, the burning and cracking of the foam of the hard polyurethane foam heat-insulation waterproof layer 4 after re-spraying are avoided, the durability of the hard polyurethane foam heat-insulation waterproof layer 4 can be effectively prevented from being reduced at a high ground temperature all the year round in the operation stage, and the long-term protection effect on the secondary lining structure is achieved.
In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "horizontal", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are conventionally placed when used, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a thermal-insulated heat dissipation supporting construction suitable for high ground temperature tunnel which characterized in that: the concrete layer comprises a primary supporting concrete layer (2), a heat insulation leveling layer (3), a heat insulation waterproof layer (4) and a secondary lining concrete layer (5) which are sequentially arranged from outside to inside; a water circulation pipeline is arranged between the heat insulation leveling layer (3) and the heat insulation waterproof layer (4); the water circulation device is characterized by further comprising a water tank (11), wherein a water pump (12) is arranged in the water tank (11), and the water pump (12) is communicated with a water circulation pipeline.
2. A heat-insulating, heat-dissipating and supporting structure suitable for a high-ground-temperature tunnel according to claim 1, wherein: a temperature sensor (6) is arranged on the inner surface of the primary supporting concrete layer (2); a temperature-sensitive switch (13) is arranged between the water pump (12) and the water circulation pipeline, the temperature-sensitive switch (13) is communicated with the temperature sensor (6), and the temperature-sensitive switch (13) can be switched on and off according to the temperature detected by the temperature sensor (6).
3. A heat-insulating, heat-dissipating and supporting structure suitable for a high-ground-temperature tunnel according to claim 2, wherein: the temperature sensors (6) are uniformly arranged along the cross section of the tunnel, three temperature sensors (6) are arranged on each cross section, and the interval between every two adjacent cross sections is 5 m.
4. A heat-insulating, heat-dissipating and supporting structure suitable for a high-ground-temperature tunnel according to claim 1, wherein: the water tank (11) is arranged in a vehicle avoiding hole (10) in the tunnel.
5. A heat-insulating, heat-dissipating and supporting structure suitable for a high-ground-temperature tunnel according to claim 1, wherein: the heat insulation leveling layer (3) and the heat insulation waterproof layer (4) are of a rigid polyurethane foam plastic spraying layered structure.
6. The heat-insulating, heat-dissipating and supporting structure for a high-ground-temperature tunnel according to claim 5, wherein: the thickness of the heat-insulating waterproof layer (4) is 80 mm.
7. A heat-insulating, heat-dissipating and supporting structure suitable for a high-ground-temperature tunnel according to claim 1, wherein: the water circulation pipeline comprises a longitudinal water circulation pipeline (7) and an annular water circulation pipeline (8) which are communicated with each other.
8. A heat-insulating, heat-dissipating and supporting structure suitable for a high-ground-temperature tunnel according to claim 7, wherein: the longitudinal water circulation pipeline (7) and the circumferential water circulation pipeline (8) are sequentially connected at the beginning.
9. A heat-insulating, heat-dissipating and supporting structure suitable for a high-ground-temperature tunnel according to claim 7 or 8, wherein: the longitudinal water circulation pipelines (7) and the circumferential water circulation pipelines (8) are both made of steel pipes with the diameter of 30-50 mm, and the interval between every two adjacent circumferential water circulation pipelines (8) is 100 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022322890.1U CN214063001U (en) | 2020-10-19 | 2020-10-19 | Heat insulation and dissipation supporting structure suitable for high-ground-temperature tunnel |
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| CN202022322890.1U CN214063001U (en) | 2020-10-19 | 2020-10-19 | Heat insulation and dissipation supporting structure suitable for high-ground-temperature tunnel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113803228A (en) * | 2021-10-15 | 2021-12-17 | 四川省交通勘察设计研究院有限公司 | High-ground-temperature tunnel in-situ power generation system and construction method thereof |
| CN113958344A (en) * | 2021-12-10 | 2022-01-21 | 北京科技大学 | High-strength heat-insulation support structure for deep well high-temperature roadway and construction method |
| CN114753866A (en) * | 2022-05-13 | 2022-07-15 | 中铁十四局集团第一工程发展有限公司 | Ultrahigh ground temperature tunnel supporting structure |
-
2020
- 2020-10-19 CN CN202022322890.1U patent/CN214063001U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113803228A (en) * | 2021-10-15 | 2021-12-17 | 四川省交通勘察设计研究院有限公司 | High-ground-temperature tunnel in-situ power generation system and construction method thereof |
| CN113803228B (en) * | 2021-10-15 | 2023-01-24 | 四川省交通勘察设计研究院有限公司 | High-ground-temperature tunnel in-situ power generation system and construction method thereof |
| CN113958344A (en) * | 2021-12-10 | 2022-01-21 | 北京科技大学 | High-strength heat-insulation support structure for deep well high-temperature roadway and construction method |
| CN113958344B (en) * | 2021-12-10 | 2022-03-08 | 北京科技大学 | High-strength heat-insulation support structure for deep well high-temperature roadway and construction method |
| CN114753866A (en) * | 2022-05-13 | 2022-07-15 | 中铁十四局集团第一工程发展有限公司 | Ultrahigh ground temperature tunnel supporting structure |
| CN114753866B (en) * | 2022-05-13 | 2023-08-04 | 中铁十四局集团第一工程发展有限公司 | Ultra-high ground temperature tunnel supporting structure |
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