CN101857409A - Flowing backfill and preparation and construction method thereof - Google Patents
Flowing backfill and preparation and construction method thereof Download PDFInfo
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- CN101857409A CN101857409A CN 201010194019 CN201010194019A CN101857409A CN 101857409 A CN101857409 A CN 101857409A CN 201010194019 CN201010194019 CN 201010194019 CN 201010194019 A CN201010194019 A CN 201010194019A CN 101857409 A CN101857409 A CN 101857409A
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Abstract
The invention relates to a flowing backfill, belonging to the field of civil engineering. The flowing backfill comprises the following components by weigh part: 100 parts of cement, 500-1000 parts of soil and 250-450 parts of water, wherein the ratio of the cement and the soil is controlled between 0.1 and 0.2, and the ratio of the water and a solid material is controlled between 0.41 and 0.43. A construction method of the flowing backfill comprises the following steps: firstly, clearing a foundation pit; secondly, preparing the flowing backfill according to the requirements; finally, carrying out on-site pouring and maintaining, wherein the pouring of the flowing backfill can be pumped or filled in the specified position by the diversion of sliding grooves without compacting or vibrating, and after completing the pouring, the flowing backfill needs to be covered with alpine meadow soil to be maintained for over 24h before allowing vehicles and pedestrians to pass through. The flowing backfill provided by the invention has the characteristics of self-compacting, environmental protection, economy, adjustable strength and the like, and is suitable for bridge abutment backfill, road widening subgrade backfill, underground engineering and pipeline construction backfill and the backfill of construction foundation pits with narrow operating space and the like.
Description
Technical field
The invention belongs to field of civil engineering, be specifically related to a kind of novel civil engineering material.This material is specially adapted to the bridges and culverts back filling behind abutment, and road is widened the roadbed backfill, underground works and pipe engineering backfill and narrow and small building foundation pit backfill.
Technical background
During the road operation, because back filling behind abutment soil different sedimentations occurs with bridge floor, cause road surface and bridge floor junction cracking, form the road surface that height differs, vehicle by the time produce and jump and impact, thereby bridges and culverts and road surface are caused additional shock load, make driver and passenger feel the discomfort of jolting, even cause vehicle significantly to slow down, and serious caused traffic accident, this phenomenon is called bumping at bridge-head.This disease is particularly outstanding in the soft clay ground highway section.The road maintenance expense of Zeng Jiaing in occupation of the major part of road maintenance upkeep charges, is a unsolved always road construction difficult problem thus.The reason that produces this problem is, local narrow near the abutment, compacting equipment can not be too near the platform back of the body during construction, backfilling material can't reach enough compactnesss, therefore after road is open to traffic use, filler inevitably produces the settlement after construction different with bridge floor under its deadweight and vehicular load effect.
Exist the road that also has of same problem to widen engineering with the bridges and culverts back filling behind abutment.Growing along with the volume of traffic, some can not satisfy service requirements to have built highway, need widen.Generally, because the roadbed of newly widening in the construction partly is difficult to compacting, therefore the roadbed and the former subgrade settlement of newly widening differs greatly, making the horizontal sedimentation of roadbed be anti-basin form distributes, often cause road surface and road structure thing to be destroyed by drawing crack, thereby influence the normal use and the traffic safety of road along new old pavement junction.
Except that above-mentioned engineering; the construction site that also exists backfilling material to be not easy to be compacted in other engineering; as burying the lower floor that water pipe, pneumatic tube, electric wire and communication cable are embedded in soil usually under the urban road underground; because the protection of pipeline and building line is narrow; can not use large-scale compact machine; therefore common backfill soil can not contact and be full of the downside of pipeline well with pipeline, thereby causes pavement of road to ftracture because of non-uniform settling, even destruction such as subside.Some constructions need be carried out below buildings for another example, the place is narrow and small, short, and common construction machinery can't enter the working-yard at all, so backfilling material can't obtain abundant compacting, this will cause the building foundation that non-uniform settling may take place, thereby bring bigger potential safety hazard.
At present, domesticly some countermeasures have been proposed in the face of these engineering problems, as light weight banket, flyash mixed cement backfill technology etc.Light weight is banketed and is had experimental engineering, obtain and must promote, but cost is higher, intensity is lower, and this has limited its range of application to a certain extent.Flyash mixed cement backfill technology also has certain development, but in present civil engineering work, flyash has obtained fine utilization, no longer being used as a kind of waste material treats, and its early strength is poor, and cost is higher, can't utilize shortcomings such as engineering spoir also to limit it in application in engineering.
Summary of the invention
The objective of the invention is to solve in road engineering and the civil engineering work that compact machine can't enter or backfilling material is difficult for being compacted the backfill construction problem in location, and a kind of fluidization backfilling material that can reach self-compacting is provided.
The quality mixture ratio of each component of fluidization backfill soil provided by the present invention is as follows:
100 parts of cement
500～1000 parts in soil
250～450 parts in water
The umber of described soil is a dry weight.
Wherein, described cement is ordinary Portland cement, and strength grade is 42.5.
Described soil should meet cohesive soil or the silty soil in the criteria for classification (DBJ01-501-92), and organic content should be less than 2%.Grain composition satisfies: by size of mesh is that the quality percentage of 0.074mm is greater than 75%.
Described water is drinkable tap water.
Cement of the present invention is controlled to be 0.1～0.2 with the ratio of the quality of soil; Cement and soil are referred to as solid material, and water is controlled to be 0.41～0.43 with the ratio of solid material.The degree of mobilization value of fluidization backfill soil provided by the present invention is 180 ± 20mm.The concrete measuring method of degree of mobilization is as follows:
1) gets test portion by discharge port.
2) prepare internal diameter 80mm, the hollow cylinder that the metal of high 80mm or rigid plastics are made.
3) the cylinder level is statically placed on steel plate or the hard plastic board.
4) slowly test portion is filled with cylinder.
5) finger raps the cylinder outside, and the surface of test portion is flushed with the upper end of cylinder, wipes the test portion that overflows.
6) slowly cylinder is vertically mentioned, and left standstill 1 minute.
7) go out the diameter of maximum diffusion diameter in test portion bottom surface and perpendicular direction with dipstick metering, the mean value that calculates both is as yield point value.
Fluidization backfill soil provided by the present invention can make by following method:
1) measures native water content: with reference to the water content of the used soil of highway earthwork test rule alcohol combustion method (TO104-93) measurement, should carry out twice horizontal survey, allow parallel difference 0.4%.
2) determine starting material and proportioning: proportioning can be decided according to strength demand, and the general relationship of intensity and lime-soil ratio and water-solid ratio is: R=1.948 * a * x
1.51/ y
2.82
Wherein, R---the intensity of fluidization backfill soil;
A---the length of time experience factor, got to get in 0.5,28 day in 7 days and got 1.5 in 1,90 day, final strength gets 1.95;
X---lime-soil ratio;
Y---water-solid ratio.
3) calculate actual used water amount and with the soil amount: actually measure: S with soil
1=S * (1+t); Actual used water amount: W
1=W-(S
1-S).
Wherein, S
1---actual in the soil amount;
S---the mass fraction of soil in the proportioning;
The water content of t---Measured Soil;
W---the mass fraction of water in the proportioning;
W
1---the actual used water amount.
4) mark takes by weighing cement, Tu Heshui by weight;
5) with cement and native dry mixing 20s;
6) mixture with cement and soil mixes with water and mix 2～3min, promptly gets the fluidization backfill soil.
The constructional method of fluidization backfill soil provided by the present invention is as follows:
1) preparation fluidization backfill soil: by construction proportioning preparation fluidization backfill soil, preparation should be carried out nearby, is controlled in the 40min from being formulated into the time that finishes of constructing.
2) build and maintenance: the cleaning foundation ditch, pour or pour into the mobile backfill soil that mixes into specified location with pumping or with ground slip-stream groove, need not compacting and vibrate.Build finish after, add a cover more than the careless felt maintenance 24h, forbid vehicle and pedestrian to pass through between preserving period.Individual layer construction thickness should be less than 1m.During construction in layer, behind bottom construction 12h, can begin the construction on upper strata.
Compare with existing backfilling material, the present invention has following beneficial effect:
1) economic environmental protection: the excavation spoir generally all is silty soil and cohesive soil, and silty soil is the poorest road-making material.Because of containing more silt grain, easily crushed, airborne dust is big, very fast quilt is drenched during immersion, easily become fluid state, and produce freezing up and frost boiling, so it in road construction as waste disposal, the fluidization backfill soil then can directly be utilized silty soil, the backfill foundation ditch, both avoided environmental pollution, and can gather materials on the spot again, economic environmental protection.
2) controllability of intensity: different soil properties, different mixture ratio have different intensity, and 28d intensity adjustments scope is 0.6MPa～2.0MPa.
3) good application property: the fluidization backfill soil has high workability, do not need when building to vibrate and rolling operation, can realize self-compacting, reach higher degree of compactness, can carry out that remote, crawl space and other are not easy to vibrate and the zone construction of compacting operation.
4) use range is wide: because materials used is simple, cheap, and can produce higher early strength under the low level of cost, construction technology is simple, can use in all kinds of civil engineering works.
Below in conjunction with embodiment the present invention is further specified.
Embodiment
Embodiment 1
Certain express highway roadbed construction, part bridges and culverts back filling behind abutment narrow space, compacting equipment can't enter.
Construction material: the cement that uses is ordinary Portland cement, and strength grade is 42.5; Water is drinkable tap water; Soil is local excavation spoir, through check, and by criteria for classification (DBJ01-501-92), this penus clay silt, organic content＜2% is that the quality percentage of 0.074mm is 20% by size of mesh, water content is 2.2%.
Construction process:
1) cleaning foundation ditch.
2) determine the construction proportioning.Selected proportioning is: 100 parts of cement, and 668 parts in soil, 322 parts in water determines that according to the water content of soil the construction proportioning is: 100 parts of cement, soil 683, water 307.
3) job mix.Adopt small-sized concrete mixer mix fluidization backfill soil, each amount of agitation of small-sized concrete mixer is about 0.2m
3, corresponding cement is 33 parts, and soil is 227 parts, and water is 102 parts.
4) ground that mixes is poured in the chute, flowed into the platform back of the body, finish in 30min from being stirred to build to finish all at every turn.
5) all build finish after, add a cover careless felt maintenance 24h.
Construction effect: during construction, the degree of mobilization value of fluidization backfill soil is 188mm, and filling is good, and no separation phenomenon takes place, and 28 days ultimate compression strength of in situ measurement is 1.39MPa.Construct and observe after 1 year, construction place road surface is intact, and phenomenons such as depression, cracking and non-uniform settling do not take place.
Embodiment 2
Certain motorway bridges and culverts back filling behind abutment construction, narrow space, compacting equipment can't enter.
Construction material: the cement that uses is ordinary Portland cement, and strength grade is 42.5; Water is drinkable tap water; Soil is the excavation spoir of this project, through check, and by criteria for classification (DBJ01-501-92), this penus clay silt, organic content＜2% is that the quality percentage of 0.074mm is 92.5% by size of mesh, water content is 2.5%.
Construction process:
1) cleaning foundation ditch.
2) determine the construction proportioning.Selected proportioning is: 100 parts of cement, and 500 parts in soil, 250 parts in water determines that according to the water content of soil the construction proportioning is: 100 parts of cement, 513 parts in soil, 237 parts in water.
3) job mix.Adopt small-sized concrete mixer mix fluidization backfill soil, each amount of agitation of small-sized concrete mixer is about 0.2m
3, corresponding cement is 43 parts, and soil is 219 parts, and water is 102 parts.
4) ground that mixes is poured in the chute, flowed into the platform back of the body, finish in 35min from being stirred to build to finish all at every turn.
5) all build finish after, add a cover careless felt maintenance 24h.
Construction effect: during construction, the degree of mobilization value of fluidization backfill soil is 183mm, and filling is good, and no separation phenomenon takes place, and 28 days ultimate compression strength of in situ measurement is 1.62MPa.Construct and observe after 1 year, phenomenons such as depression, cracking and non-uniform settling do not take place in construction place.
Embodiment 3
Certain motorway bridges and culverts back filling behind abutment construction, narrow space, compacting equipment can't enter.
Construction material: the cement that uses is ordinary Portland cement, and strength grade is 42.5; Water is drinkable tap water; Soil is the excavation spoir of this project, through check, and by criteria for classification (DBJ01-501-92), this penus clay silt, organic content＜2% is that the quality percentage of 0.074mm is 91% by size of mesh, water content is 2.4%.
Construction process:
1) cleaning foundation ditch.
2) determine the construction proportioning.Selected proportioning is: 100 parts of cement, and 1000 parts in soil, 450 parts in water determines that according to the water content of soil the construction proportioning is: 100 parts of cement, 1024 parts in soil, 426 parts in water.
3) job mix.Adopt small-sized concrete mixer mix fluidization backfill soil, each amount of agitation of small-sized concrete mixer is about 0.2m
3, corresponding cement is 23 parts, and soil is 240 parts, and water is 100 parts.
4) ground that mixes is poured in the chute, flowed into the platform back of the body, finish in 30min from being stirred to build to finish all at every turn.
5) all build finish after, add a cover careless felt maintenance 24h.
Construction effect: during construction, the degree of mobilization value of fluidization backfill soil is 172mm, and filling is good, and no bleeding separation phenomenon takes place, and 28 days ultimate compression strength of in situ measurement is 0.7MPa.Construct and observe after 1 year, construction place road surface is intact, and phenomenons such as depression, cracking and non-uniform settling do not take place.
Claims (6)
1. a fluidization backfill soil is characterized in that, the quality mixture ratio of each component of described fluidization backfill soil is:
100 parts of cement
500～1000 parts in soil
250～450 parts in water
Wherein said soil property amount is a dry mass.
2. a kind of fluidization backfill soil according to claim 1 is characterized in that described cement is ordinary Portland cement, and strength grade is 42.5.
3. a kind of fluidization backfill soil according to claim 1 is characterized in that described soil is cohesive soil or silty soil, and organic content is less than 2%, and grain composition satisfies: size of mesh be 0.074mm pass through percentage greater than 75%.
4. a kind of fluidization backfill soil according to claim 1 is characterized in that, described cement is 0.1～0.2 with the quality ratio of soil; Cement and soil are referred to as solid material, and water and solid material ratio are 0.41～0.43.
5. the preparation method of a fluidization backfill soil is characterized in that, may further comprise the steps:
1) measures native water content: with reference to the water content of the used soil of highway earthwork test rule alcohol combustion method (TO104-93) measurement, should carry out twice horizontal survey, allow parallel difference 0.4%;
2) determine starting material and proportioning: proportioning can be decided according to strength demand, and the general relationship of intensity and lime-soil ratio and water-solid ratio is: R=1.948 * a * x
1.51/ y
2.82
Wherein, R---the intensity of fluidization backfill soil;
A---the length of time experience factor, got to get in 0.5,28 day in 7 days and got 1.5 in 1,90 day, final strength gets 1.95;
X---lime-soil ratio;
Y---water-solid ratio;
3) calculate actual used water amount and measure with soil; Actual in soil amount: S
1=S * (1+t); Actual used water amount: W
1=W-(S
1-S);
Wherein, S
1---actual in the soil amount;
S---the mass fraction of soil in the proportioning;
The water content of t---Measured Soil;
W---the mass fraction of water in the proportioning;
W
1---the actual used water amount;
4) mark takes by weighing cement, Tu Heshui by weight;
5) with cement and native dry mixing 20s;
6) mixture with cement and soil mixes with water and mix 2～3min, promptly gets the fluidization backfill soil.
6. the constructional method of a fluidization backfill soil is characterized in that, may further comprise the steps:
1) according to the described method preparation of claim 5 fluidization backfill soil, is controlled in the 40min from being formulated into the time that finishes of constructing;
2) behind the cleaning foundation ditch, pour or pour into above-mentioned fluidization backfill soil into specified location with pumping or with ground slip-stream groove, need not compacting and vibrate; Build finish after, add a cover more than the careless felt maintenance 24h, forbid vehicle and pedestrian to pass through between preserving period; Individual layer construction thickness should be less than 1m; During construction in layer, behind bottom construction 12h, can begin the construction on upper strata.
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|---|---|---|---|
| CN 201010194019 CN101857409A (en) | 2010-05-28 | 2010-05-28 | Flowing backfill and preparation and construction method thereof |
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|---|---|---|---|
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Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195070A (en) * | 2013-04-03 | 2013-07-10 | 北京四方如钢混凝土制品有限公司 | Prefabricated block for backfill and backfill method |
| CN103319191A (en) * | 2013-05-21 | 2013-09-25 | 北京四方如钢混凝土制品有限公司 | Backfilling method and foamed mixed slurry |
| CN103864371A (en) * | 2014-03-17 | 2014-06-18 | 乌海市公路工程有限公司 | Backfill for checking peripheral settlement of wells and pipelines and preparation method of backfill |
| CN107299637A (en) * | 2017-07-11 | 2017-10-27 | 江苏坤泽科技股份有限公司 | A kind of solidified earth for possessing mobility pours backfill handling process |
| CN107902974A (en) * | 2017-12-13 | 2018-04-13 | 中航天建设工程有限公司 | A kind of high intensity compresses prefabricated section backfilling process |
| CN108589540A (en) * | 2018-04-23 | 2018-09-28 | 陇东学院 | A method of carrying out bridge back filling behind abutment using gangue |
| CN109898524A (en) * | 2019-03-13 | 2019-06-18 | 中国十七冶集团有限公司 | A kind of construction method using self compacting ability soil cement filling cave dwelling |
| CN110256010A (en) * | 2019-06-19 | 2019-09-20 | 江苏科技大学 | A kind of liquidation subgrade soils and construction method |
| CN110282923A (en) * | 2019-06-19 | 2019-09-27 | 江苏科技大学 | It is a kind of using Polluted Soil as the liquidation pit backfill and construction method of raw material |
| CN110776286A (en) * | 2019-09-24 | 2020-02-11 | 中电建生态环境集团有限公司 | Spoil regeneration backfill material and preparation method thereof |
| CN110903060A (en) * | 2019-12-09 | 2020-03-24 | 上海市城市建设设计研究总院（集团）有限公司 | Liquid soil and preparation method thereof |
| CN111088803A (en) * | 2019-12-12 | 2020-05-01 | 中电建生态环境集团有限公司 | Pipe ditch excavation and backfilling construction method |
| CN111335094A (en) * | 2020-02-26 | 2020-06-26 | 北京市市政工程研究院 | Method for preparing flowing material by using tail dust of asphalt mixing station and backfilling engineering part |
| CN111559887A (en) * | 2020-05-12 | 2020-08-21 | 中交上海航道勘察设计研究院有限公司 | Backfill material for local erosion pit under strong current condition |
| CN111892345A (en) * | 2019-05-06 | 2020-11-06 | 中电建生态环境集团有限公司 | Fluidized solidified soil based on granite muck and preparation method thereof |
| CN111908853A (en) * | 2019-05-07 | 2020-11-10 | 中电建生态环境集团有限公司 | Self-compacting soil, preparation method thereof and construction method for backfilling municipal cavity |
| CN112159160A (en) * | 2020-09-12 | 2021-01-01 | 北京综建科技有限公司 | Energy-saving environment-friendly backfill material and construction process thereof |
| CN112252336A (en) * | 2020-10-16 | 2021-01-22 | 中建八局发展建设有限公司 | Construction method for backfilling foundation trench of premixed fluidized solidified soil |
| CN113089747A (en) * | 2021-02-25 | 2021-07-09 | 中建三局第二建设工程有限责任公司 | Fertilizer groove backfilling construction method based on self-compacting backfilled soil |
| CN113106987A (en) * | 2021-04-09 | 2021-07-13 | 北京建材地质工程有限公司 | Construction method for spraying and filling foundation pit fertilizer groove by wet spraying method |
| CN113585290A (en) * | 2021-07-29 | 2021-11-02 | 中建八局南方建设有限公司 | Deep foundation pit narrow fertilizer groove backfill construction method based on premixed fluidized solidified soil |
| CN113968717A (en) * | 2021-12-23 | 2022-01-25 | 中铁建设集团有限公司 | Full-solid waste foundation pit backfill material containing large amount of metallurgical slag and preparation method thereof |
| CN114477902A (en) * | 2022-02-08 | 2022-05-13 | 北京中润宝成工程技术有限公司 | Soil curing agent, self-compacting high-flow-state backfill material and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195070A (en) * | 2013-04-03 | 2013-07-10 | 北京四方如钢混凝土制品有限公司 | Prefabricated block for backfill and backfill method |
| CN103319191A (en) * | 2013-05-21 | 2013-09-25 | 北京四方如钢混凝土制品有限公司 | Backfilling method and foamed mixed slurry |
| CN103319191B (en) * | 2013-05-21 | 2015-11-25 | 北京四方如钢混凝土制品有限公司 | A kind of earth-filling method and a kind of foaming mixture slurry |
| CN103864371A (en) * | 2014-03-17 | 2014-06-18 | 乌海市公路工程有限公司 | Backfill for checking peripheral settlement of wells and pipelines and preparation method of backfill |
| CN107299637A (en) * | 2017-07-11 | 2017-10-27 | 江苏坤泽科技股份有限公司 | A kind of solidified earth for possessing mobility pours backfill handling process |
| CN107902974A (en) * | 2017-12-13 | 2018-04-13 | 中航天建设工程有限公司 | A kind of high intensity compresses prefabricated section backfilling process |
| CN108589540A (en) * | 2018-04-23 | 2018-09-28 | 陇东学院 | A method of carrying out bridge back filling behind abutment using gangue |
| CN109898524A (en) * | 2019-03-13 | 2019-06-18 | 中国十七冶集团有限公司 | A kind of construction method using self compacting ability soil cement filling cave dwelling |
| CN111892345A (en) * | 2019-05-06 | 2020-11-06 | 中电建生态环境集团有限公司 | Fluidized solidified soil based on granite muck and preparation method thereof |
| CN111908853A (en) * | 2019-05-07 | 2020-11-10 | 中电建生态环境集团有限公司 | Self-compacting soil, preparation method thereof and construction method for backfilling municipal cavity |
| CN110256010A (en) * | 2019-06-19 | 2019-09-20 | 江苏科技大学 | A kind of liquidation subgrade soils and construction method |
| CN110282923A (en) * | 2019-06-19 | 2019-09-27 | 江苏科技大学 | It is a kind of using Polluted Soil as the liquidation pit backfill and construction method of raw material |
| CN110776286A (en) * | 2019-09-24 | 2020-02-11 | 中电建生态环境集团有限公司 | Spoil regeneration backfill material and preparation method thereof |
| CN110903060A (en) * | 2019-12-09 | 2020-03-24 | 上海市城市建设设计研究总院（集团）有限公司 | Liquid soil and preparation method thereof |
| CN111088803A (en) * | 2019-12-12 | 2020-05-01 | 中电建生态环境集团有限公司 | Pipe ditch excavation and backfilling construction method |
| CN111335094A (en) * | 2020-02-26 | 2020-06-26 | 北京市市政工程研究院 | Method for preparing flowing material by using tail dust of asphalt mixing station and backfilling engineering part |
| CN111335094B (en) * | 2020-02-26 | 2022-10-28 | 北京市市政工程研究院 | Method for preparing flowing material by using tail dust of asphalt mixing station and backfilling engineering position |
| CN111559887A (en) * | 2020-05-12 | 2020-08-21 | 中交上海航道勘察设计研究院有限公司 | Backfill material for local erosion pit under strong current condition |
| CN112159160A (en) * | 2020-09-12 | 2021-01-01 | 北京综建科技有限公司 | Energy-saving environment-friendly backfill material and construction process thereof |
| CN112252336A (en) * | 2020-10-16 | 2021-01-22 | 中建八局发展建设有限公司 | Construction method for backfilling foundation trench of premixed fluidized solidified soil |
| CN113089747A (en) * | 2021-02-25 | 2021-07-09 | 中建三局第二建设工程有限责任公司 | Fertilizer groove backfilling construction method based on self-compacting backfilled soil |
| CN113106987A (en) * | 2021-04-09 | 2021-07-13 | 北京建材地质工程有限公司 | Construction method for spraying and filling foundation pit fertilizer groove by wet spraying method |
| CN113585290A (en) * | 2021-07-29 | 2021-11-02 | 中建八局南方建设有限公司 | Deep foundation pit narrow fertilizer groove backfill construction method based on premixed fluidized solidified soil |
| CN113585290B (en) * | 2021-07-29 | 2022-11-11 | 中建八局南方建设有限公司 | Deep foundation pit narrow fertilizer groove backfill construction method based on premixed fluidized solidified soil |
| CN113968717A (en) * | 2021-12-23 | 2022-01-25 | 中铁建设集团有限公司 | Full-solid waste foundation pit backfill material containing large amount of metallurgical slag and preparation method thereof |
| CN114477902A (en) * | 2022-02-08 | 2022-05-13 | 北京中润宝成工程技术有限公司 | Soil curing agent, self-compacting high-flow-state backfill material and construction method thereof |
| CN114477902B (en) * | 2022-02-08 | 2022-12-16 | 北京中润宝成工程技术有限公司 | Soil curing agent, self-compacting high-flow-state backfill material and construction method thereof |
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Application publication date: 20101013 |