CN109989770A - A kind of freeway tunnel winter construction method - Google Patents
A kind of freeway tunnel winter construction method Download PDFInfo
- Publication number
- CN109989770A CN109989770A CN201910186172.5A CN201910186172A CN109989770A CN 109989770 A CN109989770 A CN 109989770A CN 201910186172 A CN201910186172 A CN 201910186172A CN 109989770 A CN109989770 A CN 109989770A
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- concrete
- temperature
- winter construction
- construction method
- hole
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
Abstract
The invention discloses a kind of freeway tunnel winter construction methods, engineering construction field is related generally to, is applied to winter highway construction, solves the problems, such as the occurrence risk of concreting in cold weather in the prior art, it is characterized in that, includes the next steps: 1) collecting meteorological data；2) simulated experiment；3) material stock and water system is built；4) freeze prevention measure is built；5) concreting；6) concrete curing；7) demoulding；The present invention simulates winter construction condition by laboratory in advance, mixes optimum concrete formulation, reduces the risk that accident occurs in winter construction because concrete is unqualified；The present invention keeps the temperature condition during concrete curing, ensure that concrete curing process is gone on smoothly also in such a way that surface covers accompanying-heat cable during concrete curing.
Description
Technical field
The present invention relates to engineering construction field, specifically a kind of freeway tunnel winter construction method.
Background technique
When environment round the clock temperature on average (when the average value of maximum and minimum temperature or local time 6,14 when and when 21 outside room
The average value of temperature) for three days on end lower than 5 DEG C or when the lowest temperature is lower than -3 DEG C, concrete construction should meet winter construction item
Part.
Winter construction is air-dried since temperature is low, it is impaired because freezing to be easy to cause engineering, while wind, snowy day gas are more, apply
Work condition and bad environments are the multiple seasons of accident resulting from poor quality of projects, especially in the majority with concrete works, and quality accident occurs hidden
Covering property, hysteresis quality, i.e. engineering are that winter is dry, most of just to start to be exposed in spring, thus are brought very to accident treatment
Big difficulty, less serious case repair, and serious person needs to construct again, not only bring loss to engineering, but also influence project progress.
Summary of the invention
The purpose of the present invention is to provide a kind of freeway tunnel winter construction methods, to solve in above-mentioned background technique
The problem of proposition.
To achieve the above object, the invention provides the following technical scheme:
A kind of freeway tunnel winter construction method, includes the next steps:
1) collect meteorological data: the meteorological data of job location meteorological observatory is collected in advance by engineering department, grasps weather forecast feelings
The meteorological variation tendency and dynamic-form of condition pass information to each construction team, schedule ahead items working procedure；
2) simulated experiment: laboratory carries out winter construction and is tested with concrete mix, selects the ratio of mud and the slump small
Concrete formulation；
3) material stock and build water system: blending station prepares raw material, construction material, cold-proof goods and materials and construction in advance
Machinery puts up water system in advance at the construction field (site)；
4) build freeze prevention measure: blending station heat preservation: blending station is totally-enclosed using color steel plate, feed bin embedded underground GEOTHERMAL WATER
Pipe, heating system use high-pressure boiler and caliduct；
Hole external thermal insulation: underground is embedded to after being wrapped up with waterpipe using thermal insulation material；Reinforcing steel processing shed uses totally enclosed type side
Method heat preservation, canopy is interior to be equipped with heating system；Outside hole air hose and into hole air hose using package thermal insulation material heat preservation；
Tunnel insulation: keeping the temperature in such a way that hole sets and sets heater in thermal insulating door thermally insulated door and hole, and temperature sensor is equipped in hole
Temperature in real-time detection hole；
5) concreting: being cleared up ice and snow in template, then sealed around template using tarpaulin before concreting, is poured
When inverted arch and filling, using chute, concrete is poured using continuous method is layered, and lift height is less than 40cm, and contracts
The section length of short every layer of casting, reduces the radiating surface of concrete, and when two liner in pouring concrete uses the symmetrical laminated pouring of ground pump,
Strict control poring rate, is vibrated using plug-in type and attached vibrator, it is ensured that concrete compaction；
6) concrete curing: after concreting, it is close to concrete surface and covers layer of plastic film, close coagulation
Extra mixing water in soil；
7) demoulding: delivering laboratory for test block in time, carry out intensity of test block inspection, and concrete cooling is more than to face to 5 DEG C
Boundary's intensity and mold when meeting room temperature concrete demoulding requirement, on the outside of concrete of dismantling.
Further, in step 2), when carrying out concrete proportioning experiment, antifreezing agent, low-temperature early strength agent are added in concrete
And water-reducing agent.
Further, in step 3), the raw material include sand, building stones and cement；The cement selection silicate cement
Mud.
Further, in step 5), when concreting, operating environment temperature is not less than -5 DEG C；The concrete enters mould
Temperature is not less than 5 DEG C.
Further, in step 6), the plastic film outer side covering accompanying-heat cable, two layers of straw mattress and colour bar cloth, which are formed, to be protected
Warm system.
Further, in step 6), the difference of the surface temperature of concrete and environment temperature is no more than 20 DEG C；Heating curing
When concrete and ground contact surface temperature be more than or equal to 2 DEG C.
Further, in step 7), the temperature difference between the concrete surface layer and environment is less than 15 DEG C.
A kind of such as application of the above-mentioned freeway tunnel winter construction method in highway construction.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention simulates winter construction condition by laboratory in advance, mixes optimum concrete formulation, reduces
The risk of accident occurs because concrete is unqualified in winter construction.
2, the present invention keeps concrete curing in such a way that surface covers accompanying-heat cable during concrete curing
Temperature condition in journey ensure that concrete curing process is gone on smoothly.
Specific embodiment
Technical solution of the present invention is described in more detail With reference to embodiment.
Embodiment 1
A kind of freeway tunnel winter construction method, comprising the following steps:
1) collect meteorological data: the meteorological data of job location meteorological observatory is collected in advance by engineering department, grasps weather forecast feelings
The meteorological variation tendency and dynamic-form of condition pass information to each construction team, schedule ahead items working procedure；
2) simulated experiment: laboratory carries out winter construction and is tested with concrete mix, selects the ratio of mud and the slump small
Concrete formulation, carry out adding antifreezing agent, low-temperature early strength agent and water-reducing agent while proportioning test in concrete, and test out
Optimum proportioning；
3) material stock and build water system: blending station prepares the raw material such as sand, rubble and cement in advance, reinforcing bar,
The construction materials such as fashioned iron, splash guard, waterstop, cotton-wadded quilt, cotton dress, door curtain, straw screen or mat, insulation board, clinker (sidewalk is anti-skidding), blowtorch,
The cold-proof goods and materials such as anti-icing fluid ,-No. 35 diesel oil, thermometer, are stored in feed bin, and check construction machinery, and replacement winter is used
Lubricating system oil and fuel, repair problematic mechanical equipment in time, put up water system in advance at the construction field (site), use
Water system uses underground water source；
4) freeze prevention measure is built:
Blending station heat preservation: blending station is totally-enclosed using color steel plate, feed bin embedded underground underground heat water pipe, and heating system is using high
Press boiler and caliduct；Not according to the raw material such as temperature and concrete mixing temperature requirement refinement water, cement, sand, stone
Synthermal section；(1) heating of mixing water and Insulation: lead to steam directly into water tank using steam low-pressure boiler and add
Heat, 55 DEG C of the heating temperature of water, water tank surrounding and top opening are kept the temperature with cotton-wadded quilt；(2) heat preservation of main equipment room: the every machine of main equipment room puts three
Electric heater keeps the temperature host, and it is tight that another door and window hangs cotton wadded curtain closing, it is ensured that main equipment room temperature guarantees zero degree or more, to guarantee
Mixing system runs well；(3) three face of host material receiving port is sealed with colored steel, and suspension blanket closing in disengaging lane guarantees mixed
Do not freeze when solidifying soil is from host blowing to waggon, it is ensured that concrete quality；(4) water supply pipeline and additive pipeline purchase rock are mixed and stirred
Cotton pipe is kept the temperature, and is discharged warmer one and is kept the temperature in additive house, and door and window adds cotton wadded curtain to be sealed, and temperature guarantees zero
Degree or more；(5) heat supplying pipeline from boiler to mixing machine takes Insulation to prevent thermal loss excessive；(6) it is periodically mixed
The detection monitoring of solidifying soil out-of-machine temperature, mix water temperature and aggregate temperature, and record is performed to adjust in time；
Hole external thermal insulation: water pipe heat-preserving range is to be that emphasis keeps the temperature section, water delivery master outside hole at 30m in water pipe source to tunnel
Pipeline is covered using ground is embedded to after thermal insulation material package using sand；Reinforcing steel processing shed is kept the temperature using totally enclosed type method, in canopy
Equipped with electric heater；Air hose and empty into hole 100m package thermal insulation material heat preservation hole exogenous wind pipe support outside hole, leaves ground；
Tunnel insulation: taking and set twice thermal insulating door thermally insulated door at hole, and spacing 10m sets 4 coal stove heat preservations between twice thermal insulating door thermally insulated door,
Carbonmonoxide detector device is arranged in hole for all coal stove external air-exhausting ducts, into hole after two heater (left and right sides of every 20 meters of settings
Each 1)；The thermal insulating door thermally insulated door is equipped with gas vent and ventilation on top using suspention heat insulating door curtain (cotton wadded curtain), twice thermal insulating door thermally insulated door
Hole, tunnel every 20 meters of setting temperature sensors since Portal Section, guarantee in canopy and temperature reaches 5 DEG C or more in hole；
It is transported using concrete tank, concrete transport vehicle tank body is wrapped up into heat preservation with a thickness of the blanket of 5cm；In addition, coagulation
Native conveyance conduit prevents the temperature of concrete during transportation using waterproof electric blanket package using duck package, joint location
Degree loss guarantees that molding temperature is not less than 5 DEG C；
5) concreting: being cleared up ice and snow in template, then sealed around template using tarpaulin before concreting, is guaranteed
Operating environment temperature is more than or equal to -5 DEG C, and the ambient air temperature of gunite concrete operation area and the material temperature for entering spraying machine are greater than
Equal to 5 DEG C；
When being poured inverted arch and filling, using chute, concrete inclines drop height degree less than 3m, and concrete is using the continuous side of layering
Method is poured, and lift height is less than 40cm, and shortens the section length of every layer of casting, reduces the radiating surface of concrete, two linings
Ground pump symmetrical laminated pouring is used when being poured concrete, strict control poring rate is shaken using plug-in type and attached vibrator
It smashes, it is ensured that concrete compaction；
Pile foundation concrete in-site pouring: radix saposhnikoviae, rain-proof, snow is taken to arrange in pile foundation steel bar cage installation and filling concrete
It applies, concrete measure are as follows: wind-proof shed is set up using steel pipe, surrounding adds plastic film to wrap up using cotton-wadded quilt, and places in wind-proof shed
Steam boiler promotes temperature, to reduce weldment temperature difference welding quality effect, and guarantees around during filling concrete
Environment temperature is carried out the steel reinforcement cage installation and perfusion of pile foundation using daytime temperature as far as possible, carried out immediately after the completion of perfusion when higher
Covering of banketing prevents frostbite concrete；
Preferably, concrete sample is taken to make test block, sampling standard before concreting are as follows:
(1) every 100 disk same specification concrete sampling is primary；
(2) when same specification concrete is less than 100 disk, per tour sub-sampling is primary；
(3) a position is often poured, sampling is primary；
6) concrete curing: cushion cap concrete curing: 1~2 day after concreting, due to the work of the heat of hydration
With concrete is in the temperature rise period, in the pre-hardening stage, is close to concrete surface and covers layer of plastic film, film surface is equipped with
The insulating layer that accompanying-heat cable (spacing 300mm), two layers of straw mattress and colour bar cloth are formed, while cladding thickness should be according to concrete measuring temperature
As a result it adjusts at any time, the heat preservation of cushion cap side uses accompanying-heat cable (spacing 300mm), two layers of straw mattress and colour bar cloth before form removal
Formed insulating layer, after concrete strength reach design strength 50% after form removal, and in time backfill foundation pit protect finished product；
7) demoulding: delivering laboratory for test block in time, carry out intensity of test block inspection, and concrete cooling is more than to face to 5 DEG C
Boundary's intensity and mold when meeting room temperature concrete demoulding requirement, on the outside of concrete of dismantling.
A kind of application of freeway tunnel winter construction method as described above in highway construction.
Embodiment 2
A kind of freeway tunnel winter construction method, comprising the following steps:
1) collect meteorological data: the meteorological data of job location meteorological observatory is collected in advance by engineering department, grasps weather forecast feelings
The meteorological variation tendency and dynamic-form of condition pass information to each construction team, schedule ahead items working procedure；
2) simulated experiment: laboratory carries out winter construction and is tested with concrete mix, selects the ratio of mud and the slump small
Concrete formulation, carry out adding antifreezing agent, low-temperature early strength agent and water-reducing agent while proportioning test in concrete, and test out
Optimum proportioning；
3) material stock and build water system: blending station prepares the raw material such as sand, rubble and cement in advance, reinforcing bar,
The construction materials such as fashioned iron, splash guard, waterstop, cotton-wadded quilt, cotton dress, door curtain, straw screen or mat, insulation board, clinker (sidewalk is anti-skidding), blowtorch,
The cold-proof goods and materials such as anti-icing fluid ,-No. 35 diesel oil, thermometer, are stored in feed bin, and check construction machinery, and replacement winter is used
Lubricating system oil and fuel, repair problematic mechanical equipment in time, put up water system in advance at the construction field (site), use
Water system uses underground water source；
4) freeze prevention measure is built:
Blending station heat preservation: blending station is totally-enclosed using color steel plate, feed bin embedded underground underground heat water pipe, and heating system is using high
Press boiler and caliduct；Not according to the raw material such as temperature and concrete mixing temperature requirement refinement water, cement, sand, stone
Synthermal section；(1) heating of mixing water and Insulation: lead to steam directly into water tank using steam low-pressure boiler and add
Heat, the heating temperature of water are 60 DEG C, and water tank surrounding and top opening are kept the temperature with cotton-wadded quilt；(2) heat preservation of main equipment room: the every machine of main equipment room puts three
Platform electric heater keeps the temperature host, and it is tight that another door and window hangs cotton wadded curtain closing, it is ensured that main equipment room temperature guarantees zero degree or more, to protect
Mixing system is demonstrate,proved to run well；(3) three face of host material receiving port is sealed with colored steel, and suspension blanket closing in disengaging lane guarantees
Do not freeze when concrete is from host blowing to waggon, it is ensured that concrete quality；(4) water supply pipeline and the purchase of additive pipeline are mixed and stirred
Rock wool pipe is kept the temperature, and is discharged warmer one and is kept the temperature in additive house, and door and window adds cotton wadded curtain to be sealed, and temperature guarantees
It is more than zero degree；(5) heat supplying pipeline from boiler to mixing machine takes Insulation to prevent thermal loss excessive；(6) timing carries out
The detection of concrete out-of-machine temperature, mix water temperature and aggregate temperature monitors, and performs record to adjust in time；
Hole external thermal insulation: water pipe heat-preserving range is to be that emphasis keeps the temperature section, water delivery master outside hole at 30m in water pipe source to tunnel
Pipeline is covered using ground is embedded to after thermal insulation material package using sand；Reinforcing steel processing shed is kept the temperature using totally enclosed type method, in canopy
Equipped with electric heater；Air hose and empty into hole 100m package thermal insulation material heat preservation hole exogenous wind pipe support outside hole, leaves ground；
Tunnel insulation: taking and set twice thermal insulating door thermally insulated door at hole, and spacing 30m sets 6 coal stove heat preservations between twice thermal insulating door thermally insulated door,
Carbonmonoxide detector device is arranged in hole for all coal stove external air-exhausting ducts, into hole after two heater (left and right sides of every 20 meters of settings
Each 1)；The thermal insulating door thermally insulated door is equipped with gas vent and ventilation on top using suspention heat insulating door curtain (cotton wadded curtain), twice thermal insulating door thermally insulated door
Hole, tunnel every 20 meters of setting temperature sensors since Portal Section, guarantee in canopy and temperature reaches 5 DEG C or more in hole；
It is transported using concrete tank, concrete transport vehicle tank body is wrapped up into heat preservation with a thickness of the blanket of 5cm；In addition, coagulation
Native conveyance conduit prevents the temperature of concrete during transportation using waterproof electric blanket package using duck package, joint location
Degree loss guarantees that molding temperature is not less than 5 DEG C；
5) concreting: being cleared up ice and snow in template, then sealed around template using tarpaulin before concreting, is guaranteed
Operating environment temperature is more than or equal to -5 DEG C, and the ambient air temperature of gunite concrete operation area and the material temperature for entering spraying machine are greater than
Equal to 5 DEG C；
When being poured inverted arch and filling, using chute, concrete inclines drop height degree less than 3m, and concrete is using the continuous side of layering
Method is poured, and lift height is less than 40cm, and shortens the section length of every layer of casting, reduces the radiating surface of concrete, two linings
Ground pump symmetrical laminated pouring is used when being poured concrete, strict control poring rate is shaken using plug-in type and attached vibrator
It smashes, it is ensured that concrete compaction；
Pile foundation concrete in-site pouring: radix saposhnikoviae, rain-proof, snow is taken to arrange in pile foundation steel bar cage installation and filling concrete
It applies, concrete measure are as follows: wind-proof shed is set up using steel pipe, surrounding adds plastic film to wrap up using cotton-wadded quilt, and places in wind-proof shed
Steam boiler promotes temperature, to reduce weldment temperature difference welding quality effect, and guarantees around during filling concrete
Environment temperature is carried out the steel reinforcement cage installation and perfusion of pile foundation using daytime temperature as far as possible, carried out immediately after the completion of perfusion when higher
Covering of banketing prevents frostbite concrete；
Preferably, concrete sample is taken to make test block, sampling standard before concreting are as follows:
(4) every 100 disk same specification concrete samples twice；
(5) when same specification concrete is less than 100 disk, per tour sub-sampling is twice；
(6) a position is often poured, sampling is twice；
6) concrete curing: cushion cap concrete curing: 1~2 day after concreting, due to the work of the heat of hydration
With concrete is in the temperature rise period, in the pre-hardening stage, is close to concrete surface and covers layer of plastic film, film surface is equipped with
The insulating layer that accompanying-heat cable (spacing 300mm), two layers of straw mattress and colour bar cloth are formed, while cladding thickness should be according to concrete measuring temperature
As a result it adjusts at any time, the heat preservation of cushion cap side uses accompanying-heat cable (spacing 300mm), two layers of straw mattress and colour bar cloth before form removal
Formed insulating layer, after concrete strength reach design strength 50% after form removal, and in time backfill foundation pit protect finished product；
7) demoulding: delivering laboratory for test block in time, carry out intensity of test block inspection, and concrete cooling is more than to face to 5 DEG C
Boundary's intensity and mold when meeting room temperature concrete demoulding requirement, on the outside of concrete of dismantling.
A kind of application of freeway tunnel winter construction method as described above in highway construction.
Better embodiment of the invention is explained in detail above, but the present invention is not limited to above-mentioned embodiment party
Formula within the knowledge of one of ordinary skill in the art can also be without departing from the purpose of the present invention
It makes a variety of changes.
Claims (8)
1. a kind of freeway tunnel winter construction method, which comprises the following steps:
1) collect meteorological data: the meteorological data of job location meteorological observatory is collected in advance by engineering department, grasps weather forecast situation
Meteorological variation tendency and dynamic-form pass information to each construction team, schedule ahead items working procedure；
2) simulated experiment: laboratory carries out winter construction and is tested with concrete mix, selects the ratio of mud and small mixed of the slump
Solidifying soil formula；
3) material stock and build water system: blending station prepares raw material, construction material, cold-proof goods and materials and construction machine in advance
Tool puts up water system in advance at the construction field (site)；
4) build freeze prevention measure: blending station heat preservation: blending station is totally-enclosed using color steel plate, feed bin embedded underground underground heat water pipe, supplies
Hot systems use high-pressure boiler and caliduct；
Hole external thermal insulation: underground is embedded to after being wrapped up with waterpipe using thermal insulation material；Reinforcing steel processing shed is protected using totally enclosed type method
Temperature, canopy is interior to be equipped with heating system；Outside hole air hose and into hole air hose using package thermal insulation material heat preservation；
Tunnel insulation: keeping the temperature in such a way that hole sets and sets heater in thermal insulating door thermally insulated door and hole, and it is real-time that temperature sensor is equipped in hole
Detect temperature in hole；
5) concreting: being cleared up ice and snow in template, then sealed around template using tarpaulin before concreting, is poured inverted arch
And when filling, using chute, concrete is poured using continuous method is layered, and lift height is less than 40cm, and is shortened every
The section length of layer casting, reduces the radiating surface of concrete, and when two liner in pouring concrete uses the symmetrical laminated pouring of ground pump, strictly
Poring rate is controlled, is vibrated using plug-in type and attached vibrator, it is ensured that concrete compaction；
6) concrete curing: after concreting, it is close to concrete surface and covers layer of plastic film, in closed concrete
Extra mixing water；
7) demoulding: delivering laboratory for test block in time, carry out intensity of test block inspection, and concrete cooling is more than critical strong to 5 DEG C
Mold when spending and meeting room temperature concrete demoulding requirement, on the outside of concrete of dismantling.
2. freeway tunnel winter construction method according to claim 1, which is characterized in that in step 2), mixed
When solidifying soil proportioning test, antifreezing agent, low-temperature early strength agent and water-reducing agent are added in concrete.
3. freeway tunnel winter construction method according to claim 2, which is characterized in that in step 3), the original
Material includes sand, building stones and cement；The cement selection portland cement.
4. freeway tunnel winter construction method according to claim 3, which is characterized in that in step 5), concrete
When pouring, operating environment temperature is not less than -5 DEG C；The concrete molding temperature is not less than 5 DEG C.
5. freeway tunnel winter construction method according to claim 4, which is characterized in that in step 6), the modeling
Expect that film outside covering accompanying-heat cable, two layers of straw mattress and colour bar cloth form insulation system.
6. freeway tunnel winter construction method according to claim 5, which is characterized in that described mixed in step 6)
The difference of solidifying soil surface temperature and environment temperature is no more than 20 DEG C；When heating curing the temperature of concrete and ground contact surface be greater than etc.
In 2 DEG C.
7. freeway tunnel winter construction method according to claim 6, which is characterized in that described mixed in step 7)
Temperature difference between solidifying soil surface layer and environment is less than 15 DEG C.
8. a kind of freeway tunnel winter construction method answering in highway construction as described in claim 1-7 is any
With.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910186172.5A CN109989770A (en) | 2019-03-12 | 2019-03-12 | A kind of freeway tunnel winter construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910186172.5A CN109989770A (en) | 2019-03-12 | 2019-03-12 | A kind of freeway tunnel winter construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113309106A (en) * | 2021-06-07 | 2021-08-27 | 中国水利水电第九工程局有限公司 | Dam concrete construction method in low-temperature season in high-altitude cold region |
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| KR100915501B1 (en) * | 2007-09-05 | 2009-09-03 | (주)하나토건 | Concrete form heating cable system for tunnel |
| CN103291322A (en) * | 2013-05-08 | 2013-09-11 | 中铁隧道集团有限公司 | Anti-freezing heating method for concrete construction of double-track railway tunnels in winter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113309106A (en) * | 2021-06-07 | 2021-08-27 | 中国水利水电第九工程局有限公司 | Dam concrete construction method in low-temperature season in high-altitude cold region |
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