CN114876467A - Refrigeratable assembled supporting structure for high-frozen-soil-content tunnel and construction method - Google Patents
Refrigeratable assembled supporting structure for high-frozen-soil-content tunnel and construction method Download PDFInfo
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- CN114876467A CN114876467A CN202210450788.0A CN202210450788A CN114876467A CN 114876467 A CN114876467 A CN 114876467A CN 202210450788 A CN202210450788 A CN 202210450788A CN 114876467 A CN114876467 A CN 114876467A
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- steel plate
- frozen soil
- corrugated steel
- tunnel
- supporting structure
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- 238000010276 construction Methods 0.000 title claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 112
- 239000010959 steel Substances 0.000 claims abstract description 112
- 238000001816 cooling Methods 0.000 claims abstract description 49
- 239000002689 soil Substances 0.000 claims abstract description 49
- 238000009413 insulation Methods 0.000 claims abstract description 12
- 238000009412 basement excavation Methods 0.000 claims abstract description 9
- 239000000155 melt Substances 0.000 claims abstract description 6
- 238000005057 refrigeration Methods 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 29
- 238000007710 freezing Methods 0.000 claims description 25
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 22
- 239000011150 reinforced concrete Substances 0.000 claims description 12
- 229910021529 ammonia Inorganic materials 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 239000002344 surface layer Substances 0.000 claims description 5
- 239000003507 refrigerant Substances 0.000 claims description 3
- 238000007363 ring formation reaction Methods 0.000 claims description 2
- 238000005246 galvanizing Methods 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 10
- 239000011435 rock Substances 0.000 abstract description 10
- 230000036571 hydration Effects 0.000 abstract description 9
- 238000006703 hydration reaction Methods 0.000 abstract description 9
- 238000002844 melting Methods 0.000 abstract description 6
- 230000008018 melting Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 239000007921 spray Substances 0.000 abstract description 3
- 230000004888 barrier function Effects 0.000 abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- 238000010257 thawing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
-
- 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
-
- 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
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/155—Laggings made of strips, slats, slabs or sheet piles
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F3/00—Cooling or drying of air
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to a refrigeratable assembled supporting structure of a tunnel with high frozen soil content and a construction method. The problems that concrete hydration heat of the existing supporting structure aggravates frost soil melting and the supporting structure is easy to invade limit are solved, and the reliability and durability of the lining structure are improved. The invention is made up of capillary cooling tube, corrugated steel plate, insulating layer, water barrier, secondary lining, refrigerator, the corrugated steel plate leans on the frozen soil surrounding rock side to mount the capillary cooling tube, lean on the side of lining to spray the insulating layer of heat insulation, the corrugated steel plate is connected through the high-strength bolt, start the refrigerator after the corrugated steel plate is mounted, thaw the frozen soil by the refreezing, lay the water barrier, pour the secondary lining; wave line steel sheet can in time form bearing structure behind this structure excavation, and can not produce the heat, makes through artificial refrigeration and melts frozen soil and unfreeze back, improves frozen soil country rock intensity and stability, sets up the insulating layer and can guarantee the cooling effect and prevent the influence of concrete hydration heat to frozen soil, prevents that frozen soil from melting once more.
Description
Technical Field
The invention relates to the field of tunnel engineering, in particular to a refrigeratable assembled supporting structure of a tunnel with high frozen soil content and a construction method.
Background
With the further improvement of the road network and the railway network, the roads and the railways extend to extremely cold regions such as Qinghai-Tibet plateau, northeast Xingan mountain and the like and need to pass through permafrost strata.
The permafrost is a soil body medium which is extremely sensitive to temperature, the tunnel is built in the permafrost more difficultly, particularly, the permafrost with high ice content is built, in the construction process of the frozen tunnel, the original permafrost is disturbed by manual pneumatic pick excavation and mechanical excavation, construction machinery and vehicles can dissipate heat, hydration heat can be generated in concrete construction, the temperature in the tunnel is normal temperature, the surface layer of the permafrost on an exposed excavation contour surface is melted and gradually develops to the deep part to form a melting ring, the permafrost with high ice content is melted more quickly, the depth is deeper, the harmfulness is larger, and even the permafrost is collapsed.
The existing concrete supporting structure is usually supported by a spray anchor or built by a mold, hydration heat can be released by concrete, the melting of frozen soil is aggravated, the working environment in a hole can be worsened by adopting the spray concrete, the supporting cycle operation time is long, the supporting structure is easy to deform and invade the limit, and the construction safety risk is high.
Disclosure of Invention
The invention provides a refrigeratable assembled supporting structure of a tunnel with high frozen soil content and a construction method, aiming at solving the technical problems that in tunnel construction, the sealing and looping of a support are slow, concrete releases hydration heat, a melting loop is large, a supporting structure is easy to be limited and the construction safety risk is high in the prior art.
In order to solve the problems of the prior art, the invention adopts the technical scheme that: the utility model provides a but high contains frozen soil tunnel refrigeration pin-connected panel supporting construction which characterized in that: including the prefabricated corrugated steel plate of assembling the cyclization that sets up around tunnel cave wall, prefabricated corrugated steel plate lean on frozen soil side recess to be provided with capillary cooling tube, lean on the lining cutting side to spout and be equipped with the insulating layer, set gradually waterproof layer and reinforced concrete secondary lining on the insulating layer, supporting construction still includes the temporary support channel-section steel that the bench excavation was accomplished the back, set up in hunch foot department.
Furthermore, the adjacent prefabricated corrugated steel plate rings and the adjacent prefabricated corrugated steel plate rings are connected by high-strength bolts, the capillary cooling pipes on the adjacent prefabricated corrugated steel plates are connected by flexible connectors, and reserved connectors are further arranged on the capillary cooling pipes.
Furthermore, a refrigerating unit is connected to the cooling pipe.
Furthermore, the refrigerating unit consists of a refrigerating machine anti-freezing solution pipe, an ammonia circulating system, an anti-freezing solution circulating system and a circulating pump, wherein the refrigerating machine anti-freezing solution pipe is connected with the reserved joint.
Further, the temporary support channel steel comprises a channel steel base plate, a reinforcing rib plate and a vertical steel plate; the channel-section steel backing plate is connected with vertical steel sheet is perpendicular, and the reinforced floor sets up in the department of meeting of channel-section steel backing plate and vertical steel sheet.
Further, the capillary cooling tubes are arranged on the side, close to the frozen soil, of the prefabricated corrugated steel plate in a U shape.
Further, each of the prefabricated corrugated steel sheets is arc-shaped and is subjected to a galvanization treatment.
A construction method of a refrigerable assembled supporting structure of a tunnel containing high frozen soil is characterized in that: the method comprises the following steps:
excavating the tunnel by adopting a step method, strictly controlling the temperature in the tunnel in the construction process, and providing a dynamic cooling measure when the temperature in the tunnel exceeds +10 ℃;
after the upper step is excavated, leveling arch springing and paving temporary supporting channel steel, jacking the prefabricated corrugated steel plate of the arch part to the arch crown by using a modified excavator, inserting the prefabricated corrugated steel plate into the temporary supporting channel steel, and screwing the prefabricated corrugated steel plate with high-strength bolts in the ring and longitudinal direction to form an arch part supporting structure;
connecting the reserved joint of the arch capillary cooling pipe with a joint of an anti-freezing solution pipe of a refrigerating machine, starting the refrigerating machine by using ammonia as a refrigerant, cooling the anti-freezing solution to-20 to-30 ℃ by an ammonia circulating system, pumping the anti-freezing solution into the arch capillary cooling pipe by using a circulating pump, enabling the low-temperature solution to absorb the heat outside the pipe and then rise in temperature, returning to the refrigerating machine to re-cool under the action of the circulating pump, and circularly flowing until the arch melts and thaws the frozen soil;
excavating a lower step, dismantling the arch foot temporary support channel steel, installing a side wall prefabricated corrugated steel plate and an inverted arch prefabricated corrugated steel plate, screwing bolts to form a prefabricated corrugated steel plate annular supporting structure, connecting the reserved cooling pipe joints of the side wall and the inverted arch with the joint of a refrigerating machine anti-freezing solution pipe, and starting the refrigerating machine to circularly flow until the surface layer melts frozen soil and is frozen again;
and (3) tightly attaching the heat-insulating layer of the corrugated steel plate, erecting annular supporting steel bars, hanging the waterproof layer on the steel bars, laying the waterproof layer, and pouring an inverted arch and an arch wall reinforced concrete secondary lining to form the tunnel lining structure with high frozen soil content.
Compared with the prior art, the invention has the following beneficial effects:
1. the prefabricated corrugated steel plate is formed by factory bending, the capillary cooling pipe is arranged on the inner side, the heat insulation layer is sprayed on the outer side, and the corrugated plate blocks are connected in the longitudinal direction by high-strength bolts, so that the prefabricated corrugated steel plate has the advantages of high strength, easiness in quality control and the like.
2. The invention can be quickly assembled by the aid of the excavator and manpower during construction, hydration heat is not generated in the early-stage corrugated steel plate support, the expansion of a melting ring is avoided, and the construction circulation speed is high.
3. The invention utilizes the preset capillary cooling pipe to carry out cooling, leads the frozen soil on the surface layer to be thawed and refrozen, improves the self-bearing capacity of the frozen soil surrounding rock and improves the construction safety.
4. The heat insulation layer is arranged, so that the cooling effect can be ensured, the influence of hydration heat in subsequent concrete construction on the frozen soil surrounding rock is blocked, and the effect of frost heaving force on the support is reduced.
5. The invention adopts the refrigerating unit with high efficiency and high cooling speed.
6. The combined structure can implement active refrigeration to thaw the frozen soil again, is beneficial to recovering the strength of the frozen soil, can form a bearing support structure in time, does not generate hydration heat during primary support, can ensure the cooling effect by arranging the heat insulation layer, also reduces the influence of the hydration heat of subsequent concrete construction on the frozen soil, eliminates a thawing ring and improves the construction safety.
Drawings
FIG. 1 is a schematic diagram of a refrigeratable assembled lining structure suitable for high frozen soil content;
FIG. 2 is a schematic diagram of the prefabricated corrugated steel plate and the capillary cooling tube according to the present invention;
FIG. 3 is a schematic view of the installation of the prefabricated corrugated steel plate after the construction of the upper step is completed;
FIG. 4 is a schematic view of the connection between the corrugated steel plate and the temporary channel steel joint at the step according to the present invention;
FIG. 5 is a schematic view of the installation of the prefabricated corrugated steel plate after the construction of the lower step of the present invention is completed;
FIG. 6 is a schematic view of the waterproof layer and lining structure according to the present invention;
FIG. 7 is a schematic view of the working principle of the external cooling unit according to the present invention;
labeled as:
1-prefabricated corrugated steel plate, 2-capillary cooling pipe, 3-cooling unit, 4-thermal insulation layer, 5-waterproof layer, 6-reinforced concrete secondary lining, 7-temporary support channel steel and 8-annular support steel bar.
1-1-high strength bolt;
2-1-a flexible connector and 2-2-a capillary cooling pipe reserved connector;
3-1-a refrigerating machine antifreezing solution pipe, 3-2-an ammonia circulating system and 3-3-an antifreezing solution circulating system;
7-1-channel steel base plate, 7-2-reinforcing rib plate and 7-3-vertical steel plate;
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
the invention provides a refrigeratable assembled supporting structure of a tunnel with high frozen soil content, which comprises a prefabricated corrugated steel plate 1, a capillary cooling pipe 2, an external cooling unit 3, a heat insulation layer 4, a waterproof layer 5 and a reinforced concrete secondary lining 6, wherein the prefabricated corrugated steel plate is arranged on the prefabricated corrugated steel plate;
a groove at the side of the prefabricated corrugated steel plate 1 close to the frozen soil is internally provided with a capillary cooling pipe 2, a thermal insulation layer 4 is sprayed at the side close to the lining, the capillary cooling pipe 2 is arranged at the outer side (close to the frozen soil) of the corrugated steel plate 1 in a U shape, and the thermal insulation layer 4 is sprayed at the inner side (close to the lining) of the corrugated steel plate 1; the corrugated steel plate 1 is connected with the longitudinal direction by high-strength bolts 1-1. The capillary cooling pipes 2 on the corrugated steel plates 1 of different plates are connected through flexible connectors 2-1, and as shown in figure 2, a waterproof layer 5 and a reinforced concrete secondary lining 6 are sequentially arranged on a heat insulation layer 4.
After the excavation of the upper step is finished, the arch corrugated steel plates 1 are assembled and formed through the high-strength bolts 1-1, the lower ends of the lowest corrugated steel plates on the two sides of the upper step are supported on the temporary supporting channel steel 7 at the step, and the assembly of the arch corrugated steel plates of the upper step is finished. Connecting the reserved joint 2-2 on the capillary cooling pipe 2 with the anti-freezing solution pipe 3-1 of the refrigerator, starting the cooling unit 3, and thawing the frozen soil surrounding rock by refreezing, as shown in fig. 3.
The temporary supporting channel steel 7 comprises a channel steel base plate 7-1, a reinforcing rib plate 7-2 and a vertical steel plate 7-3, the channel steel base plate 7-1 is vertically connected with the vertical steel plate 7-3, and the reinforcing rib plate 7-2 is arranged at the joint of the channel steel base plate 7-1 and the vertical steel plate 7-3; the prefabricated corrugated steel plate 1 is placed between the vertical steel plate 7-3 and the side wall of the tunnel wall as shown in figure 4.
And excavating a lower step, dismantling the temporary support channel steel 7, installing the side wall and the inverted arch corrugated steel plate 1, connecting the reserved joints 2-2 of the side wall and the inverted arch capillary cooling pipe with the anti-freezing solution pipe 3-1 of the refrigerator, starting the refrigerator 3, and thawing the frozen soil surrounding rocks by refreezing, as shown in fig. 5.
Erecting annular supporting steel bars 8, hanging the waterproof layer 5 on the supporting steel bars 8 to finish the laying of the waterproof layer, pouring a reinforced concrete secondary lining inverted arch, constructing the inverted arch and backfilling concrete, pouring a reinforced concrete arch wall secondary lining, and finishing the construction of a reinforced concrete secondary lining 6, as shown in fig. 6.
The refrigerating machine 3 consists of a refrigerating machine antifreezing solution pipe 3-1, an ammonia circulating system 3-2 and an antifreezing solution circulating system 3-3, wherein the ammonia circulating system 3-1 cools the antifreezing solution to a preset temperature, and then pumps the antifreezing solution to the capillary cooling pipe 2 to freeze the melted surrounding rock, as shown in fig. 7.
The invention also provides a construction method of the refrigeratable assembled supporting structure of the tunnel with high frozen soil content, which comprises the following steps:
the tunnel excavation adopts a step method for excavation, the temperature in the tunnel is strictly controlled in the construction process, and when the temperature in the tunnel exceeds +10 ℃, an active cooling measure is implemented;
the prefabricated corrugated steel plate 1 is bent and formed in a processing plant outside a hole, a capillary cooling pipe 2 is arranged on the outer side (close to frozen soil), and a thermal insulation layer 4 is sprayed on the inner side (close to lining).
Excavating an upper step, leveling an arch springing, installing temporary supporting channel steel 7, jacking a vault corrugated steel plate 1 to be closely attached to a surrounding rock surface on a working surface by using a modified excavator jacking bracket, and screwing the prefabricated corrugated steel plate 1 annularly and longitudinally by using high-strength bolts 1-1 to form an arch supporting structure. And inserting the lower end of the lowest prefabricated corrugated steel plate 1 at the two sides of the upper step into a reserved gap between the temporary support channel steel 7 at the step and the tunnel wall.
A reserved joint 2-2 of an arch capillary cooling pipe 2 is connected with a joint of an anti-freezing solution pipe 3-1 of a refrigerating machine, the refrigerating machine set 3 takes ammonia as a refrigerant, the refrigerating machine is started, an ammonia circulating system 3-2 cools the anti-freezing solution to-20 to-30 ℃, the anti-freezing solution is pumped into the capillary cooling pipe 2 by a circulating pump, the negative temperature anti-freezing solution absorbs heat outside the pipe to enable melted frozen soil to be frozen again, the temperature of the anti-freezing solution rises after the heat is absorbed by the anti-freezing solution, the anti-freezing solution returns to the refrigerating machine set 3 to be cooled again under the action of the circulating pump, and the anti-freezing solution circularly flows until the arch melts the frozen soil and is frozen again.
And excavating a lower step, dismounting the temporary support channel steel 7, mounting the side wall prefabricated corrugated steel plate 1 and the inverted arch prefabricated corrugated steel plate 1 until the side wall prefabricated corrugated steel plate and the inverted arch prefabricated corrugated steel plate are closed to form a ring, and screwing bolts to form the ring-shaped supporting structure of the prefabricated corrugated steel plate 1. And (3) connecting a reserved cooling pipe joint 2-2 of the corrugated steel plate at the side wall foot with an anti-freezing solution pipe 3-1 of a cooling unit, starting refrigeration, and cooling the frozen soil surrounding rock to freeze the melted surrounding rock on the surface layer.
Clinging to the corrugated steel plate thermal insulation layer 4, erecting annular supporting steel bars 8, hanging the waterproof layer 5 on the steel bars 8, pouring a reinforced concrete secondary lining inverted arch 6, backfilling the construction inverted arch, pouring a reinforced concrete arch wall secondary lining, and finishing the construction of the tunnel lining structure 6 with high frozen soil content.
Claims (8)
1. The utility model provides a but high contain frozen soil tunnel refrigeration pin-connected panel supporting construction which characterized in that: including assembling prefabricated corrugated steel plate (1) of cyclization around tunnel cave wall setting, prefabricated corrugated steel plate (1) lean on frozen soil side recess to be provided with capillary cooling tube (2), lean on lining cutting side to spout and be equipped with insulating layer (4), waterproof layer (5) and reinforced concrete secondary lining (6) have set gradually on insulating layer (4), supporting construction still includes that the bench excavation is accomplished the back, supports channel-section steel (7) temporarily that department of hunch foot set up.
2. The high frozen soil-containing tunnel split mounting type supporting structure capable of refrigerating according to claim 1, is characterized in that: the adjacent prefabricated corrugated steel plates (1) are connected with each other in a ring-and-longitudinal mode through high-strength bolts (1-1), capillary cooling pipes (2) on the adjacent prefabricated corrugated steel plates (1) are connected through flexible connectors (2-1), and reserved connectors (2-2) are further arranged on the capillary cooling pipes (2).
3. The refrigeratable assembled supporting structure for the tunnel with high frozen soil content according to claim 1 or 2, wherein: the cooling pipe (2) is connected with a refrigerating unit (3).
4. The refrigeratable assembled supporting structure for the tunnel with high frozen soil content according to claim 3, wherein: the refrigerating unit (3) consists of a refrigerating machine anti-freezing solution pipe (3-1), an ammonia circulating system (3-2), an anti-freezing solution circulating system (3-3) and a circulating pump, wherein the refrigerating machine anti-freezing solution pipe (3-1) is connected with the reserved joint (2-2).
5. The refrigeratable assembled supporting structure for the tunnel with high frozen soil content according to claim 4, wherein: the temporary support channel steel (7) comprises a channel steel base plate (7-1), a reinforcing rib plate (7-2) and a vertical steel plate (7-3); the channel steel base plate (7-1) is vertically connected with the vertical steel plate (7-3), and the reinforcing rib plate (7-2) is arranged at the joint of the channel steel base plate (7-1) and the vertical steel plate (7-3).
6. The refrigeratable assembled supporting structure for the tunnel with high frozen soil content according to claim 5, wherein: the capillary cooling pipe (2) is arranged on the side, close to the frozen soil, of the prefabricated corrugated steel plate (1) in a U shape.
7. The refrigeratable assembled supporting structure for the tunnel with high frozen soil content according to claim 6, wherein: each prefabricated corrugated steel plate (1) is arc-shaped and is subjected to galvanizing treatment.
8. The construction method of the refrigeratable assembled supporting structure of the tunnel with high frozen soil content according to claim 1, characterized in that: the method comprises the following steps:
excavating the tunnel by adopting a step method, strictly controlling the temperature in the tunnel in the construction process, and providing a dynamic cooling measure when the temperature in the tunnel exceeds +10 ℃;
after the upper step is excavated, leveling arch springs and paving temporary supporting channel steel (7), jacking the prefabricated corrugated steel plate (1) of the arch part to the arch crown by using a modified excavator, inserting the prefabricated corrugated steel plate (1) into the temporary supporting channel steel, and screwing the prefabricated corrugated steel plate (1) annularly and longitudinally by using high-strength bolts (1-1) to form an arch part supporting structure;
the reserved joint (2-2) of the arch capillary cooling pipe (2) is connected with a joint of an anti-freezing solution pipe (3-1) of a refrigerating machine, the refrigerating machine set (3) takes ammonia as a refrigerant, the refrigerating machine is started, the anti-freezing solution is cooled to minus 20 to minus 30 ℃ by an ammonia circulating system (3-2), the anti-freezing solution is pumped into the arch capillary cooling pipe (2) by a circulating pump, the temperature of the low-temperature solution rises after absorbing heat outside the pipe, the low-temperature solution returns to the refrigerating machine set (3) to be cooled again under the action of the circulating pump, and the circulating flow is carried out until the arch melts frozen soil and is frozen again;
excavating a lower step, dismantling the arch foot temporary support channel steel (7), installing the side wall prefabricated corrugated steel plate (1) and the inverted arch prefabricated corrugated steel plate (1), screwing bolts to form an annular supporting structure of the prefabricated corrugated steel plate (1), connecting reserved cooling pipe joints of the side wall and the inverted arch with a refrigerating machine anti-freezing solution pipe joint (3-1), and starting the refrigerating machine to circularly flow until the surface layer melts and freezes;
clinging to the corrugated steel plate heat insulation layer (4), erecting annular supporting steel bars (8), hanging the waterproof layer (5) on the steel bars (8), laying the waterproof layer (5), and pouring an inverted arch and an arch wall reinforced concrete secondary lining (6) to form the tunnel lining structure with high frozen soil content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210450788.0A CN114876467A (en) | 2022-04-27 | 2022-04-27 | Refrigeratable assembled supporting structure for high-frozen-soil-content tunnel and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210450788.0A CN114876467A (en) | 2022-04-27 | 2022-04-27 | Refrigeratable assembled supporting structure for high-frozen-soil-content tunnel and construction method |
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| CN114876467A true CN114876467A (en) | 2022-08-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117344855A (en) * | 2023-12-05 | 2024-01-05 | 河北中铸爱军建设集团股份有限公司 | Construction method of frame-core tube building structure |
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2022
- 2022-04-27 CN CN202210450788.0A patent/CN114876467A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117344855A (en) * | 2023-12-05 | 2024-01-05 | 河北中铸爱军建设集团股份有限公司 | Construction method of frame-core tube building structure |
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