CN109578028B - Method for preventing and controlling freezing injury of tunnel in cold region - Google Patents
Method for preventing and controlling freezing injury of tunnel in cold region Download PDFInfo
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- CN109578028B CN109578028B CN201910111352.7A CN201910111352A CN109578028B CN 109578028 B CN109578028 B CN 109578028B CN 201910111352 A CN201910111352 A CN 201910111352A CN 109578028 B CN109578028 B CN 109578028B
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- 230000006378 damage Effects 0.000 title claims abstract description 40
- 238000007710 freezing Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000008014 freezing Effects 0.000 title claims abstract description 34
- 208000027418 Wounds and injury Diseases 0.000 title claims abstract description 26
- 208000014674 injury Diseases 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 121
- 239000010959 steel Substances 0.000 claims abstract description 121
- 230000002265 prevention Effects 0.000 claims abstract description 15
- 238000009413 insulation Methods 0.000 claims abstract description 8
- 238000011049 filling Methods 0.000 claims description 31
- 239000010426 asphalt Substances 0.000 claims description 28
- 239000012774 insulation material Substances 0.000 claims description 19
- 230000009746 freeze damage Effects 0.000 claims description 16
- 229920002635 polyurethane Polymers 0.000 claims description 16
- 239000004814 polyurethane Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 8
- 239000011435 rock Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000002595 cold damage Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 17
- 239000004567 concrete Substances 0.000 description 9
- 238000004321 preservation Methods 0.000 description 9
- 239000011810 insulating material Substances 0.000 description 8
- 239000012528 membrane Substances 0.000 description 8
- 238000004078 waterproofing Methods 0.000 description 8
- 239000004035 construction material Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000004901 spalling Methods 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides a method for preventing and treating freezing injury of a tunnel in a cold region, which relates to the technical field of tunnels and comprises the steps of applying a freezing injury prevention layer on a lining of a target section which needs freezing injury prevention and treatment in the tunnel in the cold region, wherein the steps comprise applying a waterproof layer, a heat insulation layer and a steel plate layer; the method for preventing and controlling the cold damage of the tunnel in the cold region can effectively relieve the cold damage phenomenon in the tunnel in the cold region, prolong the service life of the heat-insulating layer and improve the structural integrity of the tunnel during operation so as to ensure the driving safety.
Description
Technical Field
The invention belongs to the technical field of tunnels, and particularly relates to a method for preventing and controlling freezing injury of a tunnel in a cold region.
Background
With the continuous development of traffic construction in China, more and more engineering cases are used for constructing tunnels in severe cold areas. The cold region tunnel is affected by cold weather, and is easy to freeze damage, such as frost cracking, spalling and the like of the tunnel lining. Once the freeze injury occurs, the structural damage of the tunnel can occur, and the lining can hang ice and invade a building limit, so that the driving safety is seriously damaged.
At present, the freeze injury of domestic cold region tunnels is relieved mainly by means of laying heat preservation layers, but the heat preservation layers are extremely easily affected by water seepage of the environment and lining in the tunnels, so that the heat preservation layers only have the service life of 5-6 years, and the requirements of tunnel operation for one hundred years cannot be met far away.
Disclosure of Invention
The invention aims to provide a method for preventing and controlling the freezing injury of a tunnel in a cold region, which aims to relieve the freezing injury phenomenon in the tunnel in the cold region, prolong the service life of an insulating layer and improve the structural integrity of the tunnel during operation so as to ensure the driving safety.
In order to achieve the purpose, the invention adopts the technical scheme that: providing a cold region tunnel freezing injury prevention method, wherein the cold region tunnel freezing injury prevention method is to apply a freezing injury prevention layer on a target section lining, and comprises applying a waterproof layer on the surface of the lining;
applying a steel plate layer outside the waterproof layer, and reserving a filling gap between the steel plate layer and the waterproof layer;
and filling the filling gap with a heat insulation layer.
Further, when a waterproof layer is applied, firstly emulsified asphalt is smeared on the surface of the lining, and then the APP modified asphalt waterproof coiled material is paved on the emulsified asphalt.
Furthermore, the steel plate layer is formed by splicing a plurality of steel plates one by one, and the heat insulation layer is formed by heat insulation materials filled between the steel plate layer and the waterproof layer.
And further, the steel plate is fixedly connected with the lining, the filling gap is reserved between the steel plate and the waterproof layer during installation, and the heat insulation material is injected into the filling gap after the installation is finished.
Furthermore, when the steel plates are installed, firstly, a plurality of steel plates are circumferentially spliced into a ring on the section of the cold region tunnel, and a plurality of rings of steel plates are spliced and installed in the length direction of the cold region tunnel to form the steel plate layer.
Furthermore, the ring formed by splicing the steel plates is arched, and the steel plates are installed from the arch bottoms at two sides to the arch top in the middle during splicing.
Furthermore, the projection shape of the steel plates is rectangular, and each ring of the steel plates are connected in a staggered joint mode.
Further, the steel plate is fixedly connected with the lining through a chemical anchor bolt.
Further, the heat insulation material is a polyurethane heat insulation material and is injected into the filling gap through a filling hole formed in the steel plate.
Further, the steel plate is a curved steel plate.
The method for preventing and controlling the cold damage of the tunnel in the cold region has the beneficial effects that: the freeze injury prevention and control layer manufactured by the method sequentially comprises a waterproof layer, a heat insulation layer and a steel plate layer from inside to outside, wherein
(1) The waterproof layer can prevent the moisture in the surrounding rock and the lining of the tunnel from seeping out, ensure that the heat-insulating layer is not damaged by water seepage and prolong the service life of the heat-insulating layer;
(2) the heat preservation layer can preserve and insulate heat, and effectively prevent and control the phenomenon of freezing injury;
(3) the steel plate layer has the second function, namely, the steel plate layer supports and protects the heat-insulating layer, so that the heat-insulating layer is prevented from being corroded by the environment in the hole, and the service life of the heat-insulating layer is prolonged; and secondly, the phenomenon of frost damage such as frost heaving cracking and spalling of the tunnel lining is prevented from damaging the driving safety, and the structural integrity of the tunnel is ensured.
Drawings
Fig. 1 is a schematic cross-sectional structure view of a freeze damage prevention layer implemented by using the method for preventing and controlling freeze damage in a tunnel in a cold region according to an embodiment of the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is a schematic front view of a steel deck;
fig. 4 is a schematic structural composition diagram of a curved steel plate.
In the figure: 1. lining, 2, a freeze injury prevention layer, 2a, a waterproof layer, 2b, a heat preservation layer, 2c, a steel plate layer, 3, a chemical anchor bolt, 4, a filling hole, 5, a steel plate, 5a, a flange plate, 6 and an anchor bolt hole.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 and fig. 2, the method for preventing and controlling freezing injury of a tunnel in a cold region according to the present invention will now be described. The method for preventing and controlling the freezing injury of the tunnel in the cold region is to apply a freezing injury prevention layer 2 on a target section lining 1, and comprises the following steps
Applying a waterproof layer 2a on the surface of the lining 1;
a steel plate layer 2c is arranged outside the waterproof layer 2a, and a filling gap is reserved between the steel plate layer 2c and the waterproof layer 2 a;
and filling the filling gap with an insulating layer 2 b.
The method can be used as a preventive measure to be applied to a newly-built tunnel and can also be used as a treatment means to be applied to the engineering for treating the freezing injury of the existing tunnel. When the method is applied to a newly-built tunnel, the target section is generally an anti-freezing fortification section of the tunnel, and when the method is applied to the freezing damage treatment engineering of the existing tunnel, the target section is a section with freezing damage.
In particular, the surface of lining 1 generally needs to be cleaned before carrying out said first step. When the method is applied to the existing tunnel freezing damage treatment project, facilities such as the existing lighting line, the G network, the power cable and the like in the tunnel need to be disassembled, moved and replaced.
The method for preventing and controlling the cold region tunnel freeze injury provided by the embodiment has the beneficial effects that: the freeze injury prevention and control layer 2 manufactured by the method sequentially comprises a waterproof layer 2a, a heat preservation layer 2b and a steel plate layer 2c from inside to outside, wherein
(1) The waterproof layer 2a can prevent the moisture in the surrounding rock and the lining of the tunnel from seeping out, ensure that the heat-insulating layer 2b is not damaged by water seepage, and prolong the service life of the heat-insulating layer;
(2) the heat preservation layer 2b can preserve and insulate heat, and effectively prevent and control the occurrence of freezing injury;
(3) the steel plate layer 2c has the second function, namely, the steel plate layer supports and protects the heat-insulating layer 2b, so that the heat-insulating layer 2b is prevented from being corroded by the environment in the hole, and the service life of the heat-insulating layer 2b is prolonged; and secondly, the phenomenon of frost damage such as frost heaving cracking and spalling of the tunnel lining 1 is prevented from damaging the driving safety, and the structural integrity of the tunnel is ensured.
Further, as a specific embodiment of the method for preventing and controlling freezing damage of the tunnel in the cold region provided by the present invention, when the waterproof layer 2a is applied, firstly, emulsified asphalt is coated on the surface of the lining 1, and then the APP modified asphalt waterproof roll is laid on the emulsified asphalt.
When having paintd the emulsified asphalt and laying APP modified asphalt waterproofing membrane, need not carry out interim support to APP modified asphalt waterproofing membrane because APP modified asphalt waterproofing membrane has very strong cohesiveness between with the emulsified asphalt, bonding that can be firm is in the same place.
Emulsified asphalt and APP modified asphalt waterproofing membrane have good adsorptivity and durability, can be as an organic whole with the firm bonding of the concrete of lining 1, and emulsified asphalt and APP modified asphalt waterproofing membrane have extremely strong waterproof, prevention of seepage performance simultaneously, can prevent effectively that moisture from oozing in tunnel country rock, the lining cutting, guarantee that heat preservation 2b does not receive the infiltration infringement, prolong its life.
Specifically, the penetration degree of the emulsified asphalt is 50-300, and the ductility is more than 40, so that the emulsified asphalt has proper consistency and ductility.
Further, as shown in fig. 3, as a specific embodiment of the method for preventing and treating cold damage in a tunnel in a cold region provided by the present invention, the steel plate layer 2c is formed by splicing a plurality of steel plates 5 one by one, and the heat insulation layer 2b is formed by a heat insulation material filled between the steel plate layer 2c and the waterproof layer 2 a.
Specifically, as shown in fig. 4, a flange plate 5a is arranged at the edge of the steel plate 5, and a bolt hole is arranged on the flange plate 5 a; the adjacent steel plates 5 are fastened and connected through high-strength bolts penetrating through the bolt holes, so that the steel plate layers 2c can be spliced one by one.
Further, as a specific implementation mode of the cold region tunnel freezing damage prevention method provided by the invention, the steel plate 5 is fixedly connected with the lining 1, the filling gap is reserved between the steel plate and the waterproof layer 2a during installation, and the heat insulation material is injected into the filling gap after the installation is finished.
Further, as a specific embodiment of the method for preventing and treating the cold region tunnel freeze injury provided by the present invention, when installing the steel plates 5, firstly, a plurality of steel plates 5 are spliced into a ring in the circumferential direction of the section of the cold region tunnel, and a multi-ring steel plate 5 is spliced and installed in the length direction of the cold region tunnel to form the steel plate layer 2 c.
The steel plates enter the field and are stacked in a circular mode in the construction mode, construction is conveniently organized, and the construction site is guaranteed to be well-ordered.
Specifically, the operation of injecting the thermal insulation material into the filling gap occurs after the completion of splicing of each ring of steel plates 5. Namely, after each ring of steel plates 5 are spliced and closed, the heat insulation material is filled, and the filling gaps between each steel plate 5 and the waterproof layer 2a on the ring are filled one by one.
Further, as a specific implementation mode of the cold region tunnel freezing injury prevention method provided by the invention, the ring formed by splicing the steel plates 5 is arched, and the steel plates 5 are arranged from the arch bottoms at two sides to the arch top in the middle during splicing.
In this embodiment, the section of the cold region tunnel is arched, and the section of the steel plate layer is identical to the section of the lining 1, and both are arched. The installation of arch bottoms from both sides to middle vault simultaneously can guarantee the concatenation efficiency of steel sheet during the concatenation, shortens the engineering time.
Further, as shown in fig. 3, as a specific embodiment of the method for preventing and treating freezing injury of a tunnel in a cold region provided by the present invention, the projection shape of the steel plates 5 is rectangular, and each ring of steel plates 5 are connected by a staggered joint.
Specifically, when the cold region tunnel section is arch-shaped, the steel plate 5 is arc-shaped when being observed from the side and is matched with the radian of the lining 1. The staggered joint connection means that in two adjacent rings, the joints of the steel plates 5 along the length direction of the tunnel are not all positioned on the same straight line, and some joints are staggered. The staggered joint connection enables the side surfaces of some steel plates 5 to be simultaneously connected with the side surfaces of two adjacent steel plates 5, so that the connection strength of the whole steel plate layer 2c is enhanced, and the structural stability is enhanced.
Further, as shown in fig. 3, as a specific embodiment of the method for preventing and treating freezing injury of a tunnel in a cold region provided by the present invention, a steel plate 5 is fixedly connected to a lining 1 by chemical anchors 3.
Specifically, the steel plate 5 is provided with an anchor hole 6 through which the chemical anchor 3 passes. After the steel plate 5 is fixed, drilling and punching are carried out on the lining 1 through anchor bolt holes 6 in the steel plate 5, and finally, the steel plate 5 is fixedly connected to the lining 1 through chemical anchor bolts 3. When the lining 1 is perforated, the drill bit needs to penetrate the waterproof layer 2 a. The steel plates 5 are not required to be all chemically anchored, and one part may be chemically anchored and the other part may be fixed by the connection between the steel plates 5.
Further, as a specific embodiment of the method for preventing and controlling freezing damage of a tunnel in a cold region provided by the present invention, the thermal insulation material is a polyurethane thermal insulation material and is injected into the filling gap through a filling hole 4 provided on a steel plate 5.
The polyurethane thermal insulation material has the advantages of carbonization, fire prevention, flame retardance, high temperature resistance, small heat conductivity coefficient, difficulty in water absorption and the like. The polyurethane heat-insulating material has good heat-insulating effect, but is easily influenced by water seepage of surrounding rocks, and the service life of the polyurethane heat-insulating material can be greatly prolonged after the polyurethane heat-insulating material is protected by the waterproof layer 2a, so that the heat-insulating function of the polyurethane heat-insulating material can be better exerted; the heat insulation material is injected into the filling gap through a filling hole 4 formed in a steel plate 5, and specifically, the heat insulation material is injected into the filling gap by means of a high-pressure polyurethane casting machine. As shown in fig. 4, the filling hole 4 is generally larger than the anchor hole 6 to ensure the injection efficiency of the insulation material.
Further, as shown in fig. 4, as a specific embodiment of the method for preventing and treating freezing injury of a tunnel in a cold region provided by the present invention, the steel plate 5 is a curved steel plate. Specifically, the steel sheet 5 is a Q345 cold-rolled galvanized steel sheet.
The concrete application of the method for preventing and controlling the freezing damage of the tunnel in the cold region is described in the following by using a concrete example, and the concrete example takes the case of treating the freezing damage of the existing tunnel as an example.
The tunnel condition that needs to be treated by freezing injury is as follows: the tunnel length is 3690m, the span is 13.62m, the height is 10.31m, and the maximum buried depth is about 283 m. The average annual temperature is 4.0 ℃, the average temperature in 1 month is-16.4 ℃, and the average temperature in 7 months is 22.9 ℃; the extreme maximum temperature is 36.3-37.7 ℃, and the extreme minimum temperature is-29.2-42.5 ℃. The maximum freeze depth was 1.92 m. The underground water in the tunnel site area mainly comprises fourth loose rock pore water and bedrock fracture water, and the local part of the underground water is upper layer stagnant water. The water level is generally 0 to 5m, and the seasonal variation range is 0.5 to 2 m. The annual average precipitation is 528 to 670 mm.
The tunnel portal is an anti-freezing design section within the range of 500m, the lining of the anti-freezing design section is made of C40 reinforced concrete with the thickness of 60cm, the rest tunnel body sections are non-anti-freezing design sections, and the lining is made of C30 plain concrete with the thickness of 60 cm. The non-frost-resistant design section (within a range of 500-1000 m from the opening) of the tunnel has serious frost damage which influences the railway operation safety, such as cracking and water seepage of the lining, bulging, void, block falling and the like caused by accumulated water and frost heaving behind the lining. The process of treating the freezing injury by using the method provided by the invention comprises the following steps:
(1) preparation for construction
The method comprises the steps of changing facilities such as existing lighting lines, G-network lines and power cables, transporting construction materials to the site and cleaning the lining surface.
The number and the variety of operating facilities in the railway business line tunnel are various, existing facilities such as contact network lines, feeder lines, AF lines, return lines, contact network suspension posts, return line bases and the like are distributed in the center line of the symmetrical tunnel, the facilities need to be disassembled and moved for convenience of construction, and the foundation of the AF line suspension posts and the return line bases which do not meet the safety distance is replaced. And when the portal scaffold is disassembled and moved, the portal scaffold is erected as a construction platform, the construction is carried out section by section according to the construction progress, and the portal scaffold is restored section by section along with the installation of the curved steel plate.
The construction materials needing to be conveyed comprise curved steel plates, polyurethane, construction tools and the like, and the construction materials are conveyed by a rail flat battery car. Before construction, the construction material is conveyed to a working surface in a tunnel. The curved steel plate is Q345 cold-rolled galvanized steel plate with the plate thickness of 6mm and the surface hot-dip thickness of not less than 84 μm. The size of the single curved steel plate is as follows: 0.945 mx (1.95 to 3.14 m).
(2) Applied as waterproof layer
And lining the target section with the freeze injury in the tunnel to form a waterproof layer, and properly extending a certain distance to the section without the freeze injury to ensure that the damage caused by the freeze injury can be eliminated. Coating a layer of heat-treated emulsified asphalt on the surface of the tunnel lining, wherein the penetration degree of the emulsified asphalt is 50-300, and the ductility is more than 40; lay APP modified asphalt waterproofing membrane immediately, because have very strong cohesiveness between APP modified asphalt waterproofing membrane and the emulsified asphalt, bonding that can be firm is in the same place, consequently need not carry out interim support to APP modified asphalt waterproofing membrane.
(3) Applying heat insulating layer and steel plate layer
And (4) applying curved steel plates ring by ring, and connecting the rings in a staggered joint manner. When a single curved steel plate is installed, the curved steel plate is fixed in a concrete layer of a lining by using a chemical anchor bolt, and flange plates which are mutually attached to adjacent curved steel plates are fastened and connected through a high-strength bolt.
The heat-insulating layer is made of a field self-foaming rigid polyurethane heat-insulating material, and the thickness of the heat-insulating layer is calculated according to GB50176-2016 civil building thermal design specifications. The heat conductivity of surrounding rock in the target section is 1.36, the heat conductivity of a lining is 1.5, the heat conductivity of the hard polyurethane heat-insulating material is 0.025, and the thickness of the hard polyurethane heat-insulating material is 50mm in consideration of the long tunnel operation period, the possibility of extreme low-temperature weather and the construction convenience, so that a 50mm filling gap is reserved between the curved steel plate and the waterproof layer.
When each ring is constructed, the curved steel plates are spliced from the arch bottoms of the two sides to the arch top of the middle part at the same time until the whole ring is closed, and eight curved steel plates are arranged in each ring. When a single curved steel plate is installed, the curved steel plate is fixed and then anchored by using M20 chemical anchor bolts, and the curved steel plate is fixed on the tunnel lining. The curved surface steel sheet on the side wall can be fixed through the chemical crab-bolt, and the part curved surface steel sheet of middle part vault can not set up the chemical crab-bolt, with adjacent curved surface steel sheet fixed connection can. After the full-ring is closed, the flange plates tightly attached to the adjacent curved steel plates are fastened and connected through M24 high-strength bolts, and then a rigid polyurethane thermal insulation material is injected into the filling gap between the curved steel plates and the waterproof layer from the filling hole reserved in the curved steel plates through a high-pressure polyurethane casting machine and self-foamed on site to form the thermal insulation layer. The hard polyurethane heat-insulating material has the thickness of 50mm, the tensile strength of not less than 180KPa, the heat conductivity coefficient of not more than 0.024W (m.K), the water absorption of not more than 3 percent, the carbonization fire resistance, the flame retardance and the high temperature resistance, the combustion grade of B1, no harmful gas generated at high temperature and good heat-insulating effect.
(4) Construction of steel plate layer foundation
And constructing a steel plate layer foundation in the original power cable grooves of the arched bottoms at two sides of the tunnel, and fixedly connecting the curved steel plates of the arched bottoms at two sides with the steel plate layer foundation after the construction. The steel plate layer foundation construction process is as follows: chiseling the concrete at the bottom of the original power cable trough by using an artificial pneumatic pick, drilling holes at intervals of 30cm by using a handheld electric drill and ensuring that the drilled holes are straight and linear; installing deformed steel bars as the stubbled steel bars of the new and old concrete, and installing steel plate layer foundation steel bar meshes; m20 foundation bolts are pre-buried every 30cm and are welded and fixed with the stubbled steel bars; after the foundation bolts and the reinforcing steel bars are installed and checked, installing and reinforcing a steel plate layer foundation side mold; and C35 commercial concrete is used for pouring and manually vibrating to compact, and the finished surface is smooth, so that the construction is completed.
Under the condition that the natural temperature outside the tunnel is between 18 ℃ below zero and 20 ℃ below zero, the surrounding rock temperature of the target section for tunnel freezing injury treatment is normal temperature, the temperature of the contact surface between the tunnel lining and the primary support is more than 3 ℃, the occurrence of frost heaving caused by accumulated water behind the tunnel lining is effectively avoided, and the smooth drainage of the treatment section in winter can be effectively ensured. The cold region tunnel is used for preventing and treating the freezing injury by adopting the method, the construction speed is high, the heat preservation effect is good, and the application prospect is good.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The method for preventing and controlling the freezing injury of the tunnel in the cold region is characterized by comprising the following steps: applying a frost damage prevention layer on the lining of the target section, which comprises
Applying a waterproof layer on the surface of the lining, wherein the waterproof layer is tightly attached to the lining and consists of emulsified asphalt and an APP modified asphalt waterproof coiled material, the waterproof layer is used for blocking water seepage in tunnel surrounding rocks or the lining, when the waterproof layer is applied, firstly, the emulsified asphalt is coated on the surface of the lining, and then the APP modified asphalt waterproof coiled material is laid on the emulsified asphalt;
applying a steel plate layer outside the waterproof layer, and reserving a filling gap between the steel plate layer and the waterproof layer;
the filling gap is filled with a heat insulation layer, the steel plate layer is formed by splicing a plurality of steel plates one by one, the heat insulation layer is formed by filling heat insulation materials between the steel plate layer and a waterproof layer, the heat insulation materials are polyurethane heat insulation materials and are injected into the filling gap through filling holes formed in the steel plates, the steel plates are fixedly connected with the lining, the filling gap is reserved between the steel plates and the waterproof layer during installation, the heat insulation materials are injected into the filling gap after installation, the steel plates are firstly spliced into a ring along the circumferential direction of the section of the cold area tunnel, a plurality of rings of the steel plates are spliced in the length direction of the cold area tunnel to form the steel plate layer, the rings formed by splicing the steel plates are arched, and the steel plates are installed from arched bottoms at two sides to an arch top in the middle during splicing.
2. The method for preventing and treating cold region tunnel freeze injury of claim 1, wherein: the projection shape of the steel plates is rectangular, and the steel plates are connected in a staggered joint mode.
3. The method for preventing and treating cold region tunnel freeze injury of claim 1, wherein: the steel plate is fixedly connected with the lining through a chemical anchor bolt.
4. The method for preventing and treating cold region tunnel freeze injury of claim 1, wherein: the steel plate is a curved surface steel plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910111352.7A CN109578028B (en) | 2019-02-12 | 2019-02-12 | Method for preventing and controlling freezing injury of tunnel in cold region |
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| CN201910111352.7A CN109578028B (en) | 2019-02-12 | 2019-02-12 | Method for preventing and controlling freezing injury of tunnel in cold region |
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| CN109578028A CN109578028A (en) | 2019-04-05 |
| CN109578028B true CN109578028B (en) | 2021-02-19 |
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| CN114184635B (en) * | 2021-12-21 | 2023-09-08 | 河北交通职业技术学院 | Seasonal frozen soil area tunnel frost heaving force simulation test device and application method thereof |
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| CN103835725B (en) * | 2014-03-05 | 2016-05-25 | 东南大学 | Anti-freezing and heat-insulating tunnel, a kind of cold district |
| CN104775833B (en) * | 2015-04-07 | 2016-08-24 | 山西省交通科学研究院 | A kind of tunnel in cold area anti-freezing and heat-insulating system and anti-freezing and heat-insulating construction method |
| CN205013017U (en) * | 2015-09-24 | 2016-02-03 | 中铁二十局集团有限公司 | Severe cold district tunnel heat preservation lining cutting structure |
| CN108166999B (en) * | 2017-09-18 | 2023-10-27 | 招商局重庆交通科研设计院有限公司 | Waterproof, antifreezing and fireproof structure of tunnel in cold region |
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