CN111908853A - Self-compacting soil, preparation method thereof and construction method for backfilling municipal cavity - Google Patents
Self-compacting soil, preparation method thereof and construction method for backfilling municipal cavity Download PDFInfo
- Publication number
- CN111908853A CN111908853A CN201910375820.1A CN201910375820A CN111908853A CN 111908853 A CN111908853 A CN 111908853A CN 201910375820 A CN201910375820 A CN 201910375820A CN 111908853 A CN111908853 A CN 111908853A
- Authority
- CN
- China
- Prior art keywords
- soil
- self
- compacting
- cement
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/10—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for raising or levelling sunken paving; for filling voids under paving; for introducing material into substructure
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention belongs to the technical field of civil engineering, and particularly relates to self-compacting soil, which comprises the following components: the soil-cement composite material comprises undisturbed soil, cement, water and an additive, wherein the mass ratio of the cement to dry soil in the undisturbed soil is 1: (3-4), wherein the mass ratio of the total mass of the cement and the dry soil in the undisturbed soil to the water is 1: (1.5-2.5), wherein the addition amount of the additive is 0.3-1.0% of the mass of the cement. The self-compacting soil provided by the invention takes original soil excavated from municipal engineering earthwork of the cavity to be backfilled as a main raw material, and combines raw materials such as cement, water, additives and the like in a specific ratio, so that the original soil of the cavity to be backfilled is reasonably utilized, the use cost of the raw materials is reduced, and the backfilling cost and the engineering cost of the cavity are reduced; and the self-compacting soil has better self-compactness, reasonable fluidity, better compressive strength and good backfilling effect.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to self-compacting soil, a preparation method thereof and a construction method for backfilling a municipal cavity.
Background
Along with the rapid development of urban construction in China, the projects of urban municipal roads, bridges, tunnels, subways and the like are comprehensively developed, the number of trench earthwork excavation projects is increased, soil bodies on two sides are settled due to trench earthwork excavation, cavities are formed on two sides of trench earthwork excavation, especially cavities are formed on the bottom layer of a road surface, the stability and the compressive strength of the road surface are damaged, potential safety hazards are caused, and the road surface is damaged. In municipal earthwork excavation engineering, in order to ensure the engineering quality and the smooth proceeding of engineering construction, cavities formed in the municipal earthwork excavation engineering, in particular cavities of a bottom layer of a pavement formed by the earthwork excavation of a pipeline groove, must be backfilled.
At present, in municipal pipeline engineering in China, a cavity backfill material formed by municipal earthwork excavation engineering is a mixed backfill material formed by taking cement as a main material and additionally mined plain soil, lime soil, yellow sand, stone powder or stone chips as auxiliary materials. Due to the particularity of the existing backfill materials, a tamping or rolling method and the like are generally adopted for a backfill mode. At the present stage, the cavities of the bottom layer of the pavement, which appear in the construction process, are rarely filled, the pavement is directly excavated under many conditions, and then the pavement is paved again. On the one hand, the raw materials of the existing backfill materials need to be mined and transported from other places, which not only has great influence on the environment and leads the limited natural resources to be exhausted, but also has high transportation cost, high construction cost and large resource consumption. On the other hand, cavities formed by municipal earthwork excavation engineering often have multiple axillary angles, such as cavities on the bottom layer of a pavement and the like, the axillary angles are difficult to roll and compact or tamp due to the fact that tamping machinery does not have enough working surfaces, the existing backfill materials are poor in filling effect, and the void ratio is large. In order to facilitate filling, the small cavities with multiple axillary corners are usually excavated in one step, and then filling materials are paved again, so that the excavation cost is high, and the construction time is prolonged.
Disclosure of Invention
The embodiment of the invention aims to provide a preparation method of self-compacting soil, and aims to solve the technical problems that cavities formed in the existing municipal earthwork excavation engineering often have multiple axillary angles, such as cavities at the bottom layer of a road surface and the like, the manufacturing cost of backfill materials of the cavities is high, backfill materials are difficult to roll and compact or tamp the axillary angles of the cavities, the combination effect with undisturbed soil around the cavities is poor, the filling effect is poor, the void ratio is high, small cavities with multiple axillary angles are often excavated in one step for convenient filling, then the filling materials are paved again, the excavation cost is high, the construction time is prolonged and the like.
Another object of an embodiment of the present invention is to provide a self-compacting soil.
The embodiment of the invention further aims to provide a construction method for backfilling municipal cavities with self-compacting soil.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a preparation method of self-compacting soil comprises the following steps:
obtaining undisturbed soil, and determining the water content of the undisturbed soil after the undisturbed soil is subjected to mud-breaking and impurity-removing treatment;
obtaining cement, wherein the mass ratio of the cement to dry soil in the undisturbed soil is 1: (3-4);
obtaining water, wherein the ratio of the total mass of the cement and the dry soil in the undisturbed soil to the total mass of the water in the self-compacting soil is 1: (1.5-2.5);
obtaining an additive, wherein the addition amount of the additive is 0.3-1.0% of the mass of the cement;
and mixing and stirring the undisturbed soil, the cement, the water and the additive according to the proportion to obtain the self-compacting soil.
Preferably, the flow value of the self-compacting soil is 160 mm-200 mm; the maximum dry density of the self-compacting soil is greater than that of the undisturbed soil; the unconfined compressive strength of the dried self-compacting soil is 2-8 MPa.
Preferably, the undisturbed soil is the soil that the cavity of waiting to backfill was excavated out because of municipal works, includes: at least one of sandy soil and clay; and/or;
the additive is selected from: at least one of an early strength agent and a water reducing agent; and/or the presence of a gas in the gas,
the cement is selected from: ordinary portland cement of PO 32.5.
Preferably, the additive is selected from at least one of sodium sulfate, triethanolamine and calcium chloride; and/or the presence of a gas in the gas,
the maximum dry density of the self-compacting soil is 2g/cm3～2.2g/cm3。
Preferably, the step of performing sludge-removing and impurity-removing treatment on the undisturbed soil comprises the following steps: crushing the undisturbed soil, and then enabling the crushed undisturbed soil to pass through a sieve pore of 5-10 mm, wherein the content of organic matters in the undisturbed soil is smaller than 8%; and/or the presence of a gas in the gas,
the mixing and stirring treatment time is 2-5 minutes.
A self-compacting soil comprising: the soil-cement composite material comprises undisturbed soil, cement, water and an additive, wherein the mass ratio of the cement to dry soil in the undisturbed soil is 1: (3-4), wherein the mass ratio of the total mass of the cement and the dry soil in the undisturbed soil to the water is 1: (1.5-2.5), wherein the addition amount of the additive is 0.3-1.0% of the mass of the cement.
A construction method for backfilling municipal cavities with self-compacting soil comprises the following steps:
preparing self-compacting soil: measuring the water content of undisturbed soil of the municipal cavity, and preparing self-compacting soil according to the water content of the undisturbed soil;
grouting: pouring the self-compacting soil into the municipal cavity;
and (5) maintenance: and curing the municipal cavity filled with the self-compacting soil.
Preferably, the grouting step further comprises, before the grouting step: a formwork is supported at the periphery of the municipal cavity; the step of supporting the formwork comprises: the distance between the surrounding baffle template of the supporting mold and the edge of the municipal cavity is 20-30 cm, and the surrounding baffle template of the supporting mold is 20-30 cm higher than the highest horizontal plane of the municipal cavity.
Preferably, the grouting step further comprises: coating a mold release agent on the template of the supporting mold; and/or the presence of a gas in the gas,
the grouting step comprises: and pouring the self-compacting soil into the municipal cavity layer by adopting an artificial grouting and/or mechanical grouting mode, wherein the number of layers of the layered pouring at least comprises one layer.
Preferably, the step of maintaining comprises: and curing the poured municipal cavity of the self-compacting soil until the strength of the self-compacting soil reaches more than 75% of the permanent strength of the self-compacting soil, wherein the self-compacting soil is not interfered by external loads in a curing period.
The preparation method of the self-compacting soil provided by the invention comprises the steps of obtaining the water content of undisturbed soil of a cavity formed by municipal earthwork excavation engineering to be backfilled, and determining the content of dry soil in the undisturbed soil; then determining the proportion of cement, water and additives in the raw materials for preparing the self-compacting soil according to the water content of the undisturbed soil as follows: the mass ratio of the cement to the dry soil in the undisturbed soil is 1: (3-4), wherein the mass ratio of the total mass of the dry soil in the cement and undisturbed soil to the water is 1: (1.5-2.5), and the addition amount of the additive is 0.3-1.0% of the mass of the cement. And finally, mixing and stirring the raw materials in the specific ratio to obtain the self-compacting soil. On one hand, the self-compacting soil prepared by the invention takes original soil excavated from the municipal engineering of the cavity to be backfilled as a main raw material, so that the original soil of the cavity to be backfilled is reasonably utilized, gravels do not need to be mined from other places as a backfilling raw material, the use cost of the raw material is reduced, the discharge of solid wastes is reduced, the transportation cost of abandoned soil is saved, the workload of mechanical equipment in construction is correspondingly reduced, the cavity backfilling cost is greatly reduced, the construction cost is saved, the construction progress is accelerated, the energy consumption is controlled, and the development requirements of energy conservation and environmental protection in the construction industry are met. On the other hand, the self-compacting soil prepared by the undisturbed soil, the cement, the water and the additive in a specific ratio has better self-compactness, and the self-compacting soil after being backfilled into the cavity can flow and compact under the action of self gravity to achieve the aim of completely filling the cavity due to the better self-compactness, so that the backfill effect on the cavity is good, and the void ratio is low. In addition, the self-compacting soil takes undisturbed soil to be filled in the cavity as a main raw material, so that the self-compacting soil has better compatibility with the soil in the cavity, and the combination effect of the self-compacting soil and the soil around the cavity is improved.
The self-compacting soil provided by the invention takes original soil excavated from a cavity to be backfilled due to municipal engineering earthwork as a main raw material, and combines raw materials such as cement, water, additives and the like with a specific proportion, so that the original soil of the cavity to be backfilled is reasonably utilized, the use cost of the raw materials is reduced, the discharge of solid wastes is reduced, the workload of mechanical equipment in construction is correspondingly reduced, the abandoned soil transportation cost is saved, the cavity backfilling cost and the engineering cost are reduced, the construction progress is accelerated, and the development requirements of energy conservation and environmental protection in the co-construction industry are met; and through the undisturbed soil, the cement, the water and the additive which are in specific proportion, the self-compaction soil has good self-compaction and reasonable fluidity (the fluidity is 160-200 mm), has a good backfill effect on the cavity, and also has good compressive strength, and the unconfined compressive strength of the self-compaction soil after being dried is more than 2MPa, so that the requirement of municipal construction is met.
According to the construction method for backfilling the municipal cavity by the self-compacting soil, the self-compacting soil is prepared according to the preparation method by measuring the water content of the original soil forming the cavity to be backfilled due to the earthwork excavation engineering of municipal roads, bridges, tunnels, subways and the like, and then the backfilling of the municipal cavity can be completed through grouting and curing.
Drawings
Fig. 1 is a schematic view of a pavement underlayer cavity provided by an embodiment of the invention.
Fig. 2 is a diagram illustrating the combination of self-compacting soil and undisturbed soil after the self-compacting soil is filled according to the embodiment of the invention.
Detailed Description
In order to make the purpose, technical solution and technical effect of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention is clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive step in connection with the embodiments of the present invention shall fall within the scope of protection of the present invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The weight of the related components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present invention as long as it is in accordance with the description of the embodiments of the present invention. Specifically, the weight described in the description of the embodiment of the present invention may be a unit of mass known in the chemical industry field, such as μ g, mg, g, and kg.
The embodiment of the invention provides a preparation method of self-compacting soil, which comprises the following steps:
s10, obtaining undisturbed soil, performing sludge-removing and impurity-removing treatment on the undisturbed soil, and determining the water content of the undisturbed soil;
s20, obtaining cement, wherein the mass ratio of the cement to dry soil in the undisturbed soil is 1: (3-4);
s30, obtaining water, wherein the ratio of the total mass of the cement and the dry soil in the undisturbed soil to the total mass of the water in the self-compacting soil is 1: (1.5-2.5);
s40, obtaining an additive, wherein the addition amount of the additive is 0.3-1.0% of the mass of the cement;
s50, mixing and stirring the undisturbed soil, the cement, the water and the additive according to the proportion to obtain the self-compacting soil.
According to the preparation method of the self-compacting soil provided by the embodiment of the invention, the content of the dry soil after the moisture contained in the undisturbed soil is removed is determined by obtaining the moisture content of the undisturbed soil of the cavity formed by the municipal earthwork excavation project to be backfilled; then determining the proportion of cement, water and additives in the raw materials for preparing the self-compacting soil according to the water content of the undisturbed soil as follows: the mass ratio of the cement to the dry soil in the undisturbed soil is 1: (3-4), wherein the mass ratio of the total mass of the dry soil in the cement and undisturbed soil to the water is 1: (1.5-2.5), and the addition amount of the additive is 0.3-1.0% of the mass of the cement. And finally, mixing and stirring the raw materials in the specific ratio to obtain the self-compacting soil. On one hand, the self-compacting soil prepared by the embodiment of the invention takes the original soil excavated from the municipal engineering of the cavity to be backfilled as the main raw material, so that the original soil of the cavity to be backfilled is reasonably utilized, gravels do not need to be mined from other places as the backfilling raw material, the use cost of the raw material is reduced, the discharge of solid waste is reduced, the transportation cost of abandoned soil is saved, the workload of mechanical equipment in construction is correspondingly reduced, the cavity backfilling cost is greatly reduced, the construction cost is saved, the construction progress is accelerated, the energy consumption is controlled, and the development requirements of energy conservation and environmental protection in the construction industry are met. On the other hand, the self-compacting soil prepared by the undisturbed soil, the cement, the water and the additive in the specific ratio has better self-compactness, and after the self-compacting soil is backfilled into the cavity, the self-compacting soil can flow and compact under the action of self gravity to achieve the purpose of completely filling the cavity, so that the backfill effect on the cavity is good, and the void ratio is low. In addition, as the self-compacting soil in the embodiment of the invention takes the undisturbed soil of the cavity to be filled as the main raw material, the self-compacting soil has better compatibility with the soil in the cavity, and the combination effect of the self-compacting soil and the soil around the cavity is increased.
Specifically, the dry soil in the undisturbed soil refers to soil from which water contained in the undisturbed soil is removed; the flow value of the self-compacting soil is 160-200 mm; the maximum dry density of the self-compacting soil is greater than that of the undisturbed soil; the unconfined compressive strength of the dried self-compacting soil is 2-8 MPa. The self-compacting soil prepared by the embodiment of the invention has excellent characteristics, on one hand, the self-compacting soil prepared by the embodiment of the invention has proper fluidity, the fluidity value is 160-200 mm, the self-compacting property of the self-compacting soil is ensured, the self-compacting soil can better flow, diffuse and compact the whole cavity through the self gravity when backfilling the cavity, the filling effect is good, and the void ratio is low. When the flow value is larger than 200mm, the water content in the self-compaction soil is too high, so that the solidification time and the solidification effect of the self-compaction soil are influenced, and the self-compaction soil is easy to generate a bleeding condition in the backfilling and solidifying process, so that the strength of the self-compaction soil is damaged, and the filling effect is influenced. When the flow value is less than 160mm, the self-compacting soil has poor flowability and poor compacting effect, the cavity is not fully filled, and gaps and holes are easy to appear. On the other hand, the self-compacting soil prepared by the embodiment of the invention has the maximum dry density which is greater than that of the undisturbed soil, and in the process of backfilling the cavity, the self-compacting soil with the high density can extrude and spread the undisturbed soil with relatively low density, so that the bonding part of the self-compacting soil and the undisturbed soil around the cavity is very tight, the bonding effect is better, and the backfilling effect of the self-compacting soil on the cavity is ensured. As a preferred example, the maximum dry density of the self-compacting soil of the examples of the present invention is 2g/cm3～2.2g/cm3And the requirement of backfilling cavities in different municipal works can be met. On the other hand, the self-compacting soil prepared by the embodiment of the invention has better strength, the unconfined compressive strength after drying is 2-8 MPa, and the high compressive strength after drying not only ensures the integrity of projects such as a roadbed and the like after backfillingThe quality of the restored roadbed and other projects is guaranteed, the strength is far higher than the quality standard of the roadbed soil, the acceptance standard of the roadbed soil is met, and the requirements of various subsequent municipal construction operations on the strength of the backfilled cavity can be met.
Specifically, in step S10, undisturbed soil is obtained, and after the undisturbed soil is subjected to sludge-removing and impurity-removing processes, the water content of the undisturbed soil is measured. According to the embodiment of the invention, the soil excavated out of the municipal engineering earthwork of the cavity to be backfilled is taken as a main raw material, so that the undisturbed soil of the cavity to be backfilled is reasonably utilized, the use cost of the raw material is reduced, the abandoned soil transportation cost is saved, the construction cost is reduced, and the construction progress is accelerated. And the self-compacting soil has better compatibility with the soil in the cavity, and the combination effect of the self-compacting soil and the soil around the cavity is improved. According to the embodiment of the invention, large stones, plastics, leaves and other impurities in undisturbed soil are removed through mud-removing and slag-removing treatment. Impurities in undisturbed soil will affect the self-compacting soil into an organic whole, for example: degradable materials such as leaves and the like can be degraded in the self-compacting soil subsequently to form a cavity finally, so that the stability of the self-compacting soil is influenced; non-degradable materials such as plastics and the like are in the self-compacting soil, so that the self-compacting soil has a plurality of weak surfaces, and the strength is influenced; the large stones affect the fluidity of the soil and cannot completely fill the narrow voids in the cavity. Then, the water content in the undisturbed soil is determined, the water content in the undisturbed soil can be determined, the water content in the undisturbed soil is removed, the content of the dry soil in the undisturbed soil can be determined, and the determination of the adding proportion of other raw materials in the self-compacting soil is facilitated, so that the consumption of each raw material in the prepared self-compacting soil is reasonable, the self-compacting soil has the best self-compacting performance, and the requirement of cavity backfilling is met.
In some implementations, the undisturbed soil is sandy soil; in another embodiment, the undisturbed soil is clay, and in other embodiments, the undisturbed soil is a mixture of sand and clay.
As a preferred embodiment, the step of performing sludge-removing and impurity-removing treatment on the undisturbed soil comprises the following steps: and crushing the undisturbed soil, and then passing through a sieve pore of 5-10 mm, wherein the content of organic matters in the undisturbed soil is less than 8%. According to the embodiment of the invention, the undisturbed soil is crushed and then screened, so that the particle size of the undisturbed soil is refined while impurity substances in the undisturbed soil are removed. On one hand, the undisturbed soil with small particle size has better compatible mixing effect with raw material components such as cement, additives, water and the like, and the self-compaction performance of the prepared self-compaction soil is further ensured. On the other hand, the raw material with small particle size is also favorable for the self-compacting soil to better spread and permeate into small gaps in the backfilling process, so that the void ratio is reduced, and the backfilling effect is improved. In addition, through mud-breaking and impurity-removing treatment, the content of organic matters in the undisturbed soil is smaller than 8%, and the low-content organic matters in the undisturbed soil further ensure the stability and the durability of the self-compacting soil, so that the performance of influencing the strength of the roadbed and the like due to the formation of gaps caused by the degradation of the organic matters can not occur even along with the lapse of time. In some embodiments, the undisturbed soil is sandy soil, and the sandy soil is crushed and then passes through a 5mm sieve mesh; in other embodiments, the undisturbed soil is clay, the clay is crushed and then passes through a 10mm sieve mesh, and the organic matter content is less than 8%.
Specifically, in step S20, cement is obtained, and the mass ratio of the cement to the dry soil in the undisturbed soil is 1: (3-4). The embodiment of the invention determines the content of the dry soil in the undisturbed soil by measuring the water content in the undisturbed soil, and then determines the proportion of the cement required to be added for preparing the self-compacting soil according to the content of the dry soil as follows: the mass ratio of the cement to the dry soil in the undisturbed soil is 1: (3-4), the prepared self-compacting soil has better strength, and the cavity strength after the self-compacting soil is filled by adopting the embodiment of the invention can meet various municipal construction requirements. If the proportion of cement in the self-compacting soil is too low, the strength of the self-compacting soil cannot meet the requirement, and the requirement of municipal construction on the strength cannot be met. If the content of the cement in the self-compaction soil is too high, on one hand, the fluidity of the self-compaction soil is influenced, the fluidity is reduced, the self-compaction effect in the cavity is reduced, and the filling effect is reduced; on the other hand, the strength of the self-compaction soil is gradually reduced along with the gradual increase of the cement dosage, the crack phenomenon is gradually obvious, the hydration heat value is high, the temperature difference crack is easily caused, and the shrinkage crack of the self-compaction soil is increased.
Specifically, in step S30, water is obtained such that the ratio of the total mass of the dry soil in the cement and the undisturbed soil to the total mass of the water in the self-compacting soil is 1: (1.5-2.5). According to the embodiment of the invention, the total mass of the water required by the self-compacting soil is determined according to the total mass of the dry soil and the cement in the raw materials, and then the water amount required to be additionally added can be obtained according to the measured water content of the undisturbed soil. On one hand, the added water provides the condition of cement hydration, and on the other hand, the prepared self-compaction soil has better fluidity and self-compaction property, and the filling effect is improved. If the water content added into the self-compacting soil is too low, the prepared self-compacting soil has poor flowability and poor self-compacting effect, cannot fill gaps in the backfill cavity, and is easy to generate gaps and holes, and the backfill effect is poor. If the water content added into the self-compacting soil is too high, the prepared self-compacting soil has too high water content, too high fluidity and long solidification time, and bleeding is easy to occur, so that the strength of the self-compacting soil is damaged, and the backfilling effect is influenced.
Specifically, in step S40, an additive is obtained, and the additive is added in an amount of 0.3% to 1.0% by mass of the cement. According to the embodiment of the invention, the addition amount of the additive is determined to be 0.3-1.0% of the mass of the cement according to the addition amount of the cement in the self-compacting soil, and the setting time of the self-compacting soil is controlled by reasonably adding the additive, so that the self-compacting and backfilling effects of the prepared self-compacting soil in the cavity are ensured. If the content of the additive in the self-compacting soil is too high, the solidification speed is too high, the slurry is solidified when the slurry is not completely spread and filled in the municipal cavity, holes are easy to form, and the filling effect is poor; if the content of the additive in the self-compacting soil is too low, the setting time of the self-compacting soil is too long, and the maintenance and construction operation time is prolonged. In some embodiments, the additive may be added in an amount of 0.3%, 0.5%, 0.7%, 0.9%, 1% by mass of the cement.
As a preferred embodiment, the additive is selected from: at least one of an early strength agent and a water reducing agent. The additive adopted in the embodiment of the invention can be added with at least one of an early strength agent and a water reducing agent according to specific construction requirements. The early strength agent can accelerate the hydration speed of cement in the self-compaction soil, promote the development of the early strength of the self-compaction soil, has no obvious influence on the later strength of the self-compaction soil, and has the early strength function and a certain water reducing and enhancing function. The water reducing agent has a dispersing effect on cement particles in the self-compacting soil, can improve the workability of cement, reduce unit water consumption and improve the flowability of the self-compacting soil. According to the embodiment of the invention, the solidification time of the self-compacting soil is effectively controlled by adding additives such as the early strength agent, the water reducing agent and the like in a reasonable ratio, and the self-compacting and backfilling effects of the prepared self-compacting soil in the cavity are ensured. In some embodiments, the setting time of the self-compacting soil is controlled to be 30-60 minutes by the additive, so that the construction operation of backfilling the cavity with the self-compacting soil is facilitated, and the filling effect is ensured at gaps such as axillary corners of the cavity and the like, which can be fully flowed by the self-compacting soil in the cavity.
As a preferred embodiment, the additive is at least one selected from sodium sulfate, triethanolamine and calcium chloride. On one hand, the calcium chloride additive generates hydrated chloroaluminate which cannot be dissolved in water through the action of chloride and calcium in cement, and the hydration of the calcium in the cement is accelerated. On the other hand, calcium chlorate which is not easy to dissolve in water is generated by calcium hydroxide formed by hydration of chloride and cement, the concentration of the calcium hydroxide in a liquid phase is reduced, the hydration speed of the calcium is accelerated, and the generated complex salt increases the volume of a solid phase in cement paste to form an internal skeleton system, thereby being beneficial to formation of a cement stone structure. Therefore, the calcium chloride additive can accelerate the setting and hardening of cement and improve the early strength of the self-compacting soil; the hydration heat release of the cement can be improved, the temperature of the cement is improved, and the setting time of the self-compacting soil can be well controlled by adjusting the amount of the additive. The sodium sulfate composite early strength agent is dissolved in water and reacts with calcium hydroxide generated by hydration of cement to generate calcium oxide and calcium sulfate. The newly formed calcium sulfate has extremely fine particles and higher activity than calcium sulfate, so that the calcium sulfate reacts with calcium to generate hydrated calcium sulphoaluminate at a much higher speed, thereby realizing the function of controlling the setting time of the self-compacting soil. The triethanolamine composite early strength agent can not change cement hydration products, but can promote the action of hydrated calcium aluminate and gypsum to generate calcium aluminum sulfate crystals, accelerate the hydration of tricalcium silicate, has the functions of early strength and later-stage reinforcement on self-compaction soil, and can adjust the setting time of the self-compaction soil.
The type of cement is not particularly limited in the embodiment of the invention, as long as the self-compacting soil in the embodiment of the invention can meet the requirements of municipal construction on the performances such as strength, fluidity, maximum dry density and the like. In some embodiments, the cement is selected from: compared with the ordinary Portland cement of other specifications 32.5, the PO32.5 cement selected by the embodiment of the invention has higher 7-day strength, is more beneficial to the construction on site, shortens the construction period, and has high yield, wide source and low cost.
Specifically, in step S50, the undisturbed soil, the cement, the water, and the additive are mixed and stirred according to the mixture ratio, so as to obtain the self-compacting soil. According to the embodiment of the invention, the self-compacting soil can be obtained by mixing and stirring the raw materials of the undisturbed soil, the cement, the water and the additive in a specific proportion, the preparation method is simple, the operation is easy, and the feasibility of mass production and cavity backfilling applied to municipal engineering is high. The embodiment of the invention does not specifically limit the mixing sequence of the raw materials of the self-compacting soil, and the self-compacting soil can be obtained by mixing according to specific construction conditions. In some embodiments, the undisturbed soil, the cement, the water and the additive are mixed and stirred according to the mixture ratio to obtain the self-compacting soil. In other embodiments, the water and the soil in a specific proportion are mixed and stirred uniformly, and then the cement and the additive are added for further mixing and stirring treatment to obtain the self-compacting soil.
In a preferred embodiment, the mixing and stirring treatment time is 2 to 5 minutes. According to the embodiment of the invention, the raw materials of the self-compacting soil are stirred and mixed for 2-5 minutes according to a specific ratio, and the self-compacting soil can be used for cavity backfilling of various municipal works, and is simple and rapid to prepare and high in practicability. If the self-compaction soil is stirred for too long time and cement ash in the self-compaction soil is solidified, the self-compaction soil is excessively adhered to the wall of the equipment, the self-compaction soil is not favorably treated, the flowability and the self-compaction performance of the self-compaction soil are influenced, the self-compaction backfilling effect in the subsequent backfilling process is not favorably realized, and meanwhile, the construction time is prolonged through long-time stirring. The embodiment of the invention does not specifically limit the specific technological means and equipment for stirring and mixing, can determine the type of stirring equipment according to the demand of the on-site self-compacting soil and the type of the undisturbed soil, and only needs to realize uniform mixing of raw materials such as cement, undisturbed soil, water, additives and the like with specific proportion in the self-compacting soil, no aggregates, no bleeding and segregation phenomena and form stable self-compacting soil. In some embodiments, the time of the mixing and stirring process may be 2 minutes, 3 minutes, 4 minutes, 5 minutes.
The embodiment of the invention also provides self-compacting soil, which comprises: the soil-cement composite material comprises undisturbed soil, cement, water and an additive, wherein the mass ratio of the cement to dry soil in the undisturbed soil is 1: (3-4), wherein the mass ratio of the total mass of the cement and the dry soil in the undisturbed soil to the water is 1: (1.5-2.5), wherein the addition amount of the additive is 0.3-1.0% of the mass of the cement.
The self-compacting soil provided by the embodiment of the invention takes the original soil excavated from the municipal engineering earthwork of the cavity to be backfilled as a main raw material, and combines the raw materials such as cement, water, additives and the like with specific proportions, so that the original soil of the cavity to be backfilled is reasonably utilized, the use cost of the raw materials is reduced, the discharge of solid wastes is reduced, the workload of mechanical equipment in construction is correspondingly reduced, the transportation cost of waste soil is saved, the backfill cost of the cavity and the construction cost are reduced, the construction progress is accelerated, and the development requirements of energy conservation and environmental protection in the construction industry are met; and through the undisturbed soil, the cement, the water and the additive which are in specific proportion, the self-compaction soil has good self-compaction and reasonable fluidity (the fluidity is 160-200 mm), has a good backfill effect on the cavity, and also has good compressive strength, and the unconfined compressive strength of the self-compaction soil after being dried is more than 2MPa, so that the requirement of municipal construction is met.
The embodiment of the invention also provides a construction method for the self-compacting municipal road surface bottom layer cavity, which comprises the following steps:
s60, preparing self-compacting soil: measuring the water content of undisturbed soil of the municipal cavity, and preparing self-compacting soil according to the water content of the undisturbed soil;
s70, grouting: pouring the self-compacting soil into the municipal cavity;
s80, maintenance: and curing the municipal cavity filled with the self-compacting soil.
According to the construction method for backfilling the municipal cavity by the self-compacting soil, provided by the embodiment of the invention, the self-compacting soil is prepared according to the preparation method by measuring the water content of the original soil forming the to-be-backfilled cavity due to the earthwork excavation engineering of municipal roads, bridges, tunnels, subways and the like, and then the backfilling of the municipal cavity can be completed through grouting and curing.
As a preferred embodiment, the construction method of self-compacting soil back into municipal cavities provided by the embodiment of the present invention is preferably applied to backfill of cavities of a pavement bottom layer formed by excavation of a pipeline trench, as shown in fig. 1. After the construction method provided by the embodiment of the invention is used, the filling quality of the cavity in the subgrade settlement area is high, the integrity of the subgrade is ensured, the quality of the recovered passing pavement is ensured, and the damage of construction to the pavement is controlled.
Specifically, in step S60, the self-compacting soil is prepared: and (3) determining the water content of the undisturbed soil of the municipal cavity, and preparing the self-compacting soil according to the water content of the undisturbed soil. The method for preparing the self-compacting soil in the embodiment of the invention has the same effect as the method for preparing the self-compacting soil and the prepared self-compacting soil, and the method is not repeated again.
Specifically, in step S70, grouting: pouring the self-compacting soil into the municipal cavity. According to the embodiment of the invention, the prepared self-compacting soil is poured into the municipal cavity, so that the self-compacting soil flows and is compacted in the cavity under the action of self gravity, the purpose of completely filling the cavity is achieved, the municipal cavity is backfilled effectively, and the void ratio is low.
In some embodiments, prior to the grouting step, further comprising: a formwork is supported at the periphery of the municipal cavity; the step of supporting the formwork comprises: the distance between the surrounding baffle template of the supporting mold and the edge of the municipal cavity is 20-30 cm, and the surrounding baffle template of the supporting mold is 20-30 cm higher than the highest horizontal plane of the municipal cavity. According to the embodiment of the invention, the enclosure template which is 20-30 cm higher than the highest horizontal plane of the municipal cavity is arranged at a position 20-30 cm away from the peripheral edge of the municipal cavity, so that the self-compacting soil is conveniently grouted, the slurry is prevented from flowing out, and the slurry can be better filled in the cavity. Before formwork supporting, the strength, rigidity and stability of the formwork are calculated, and the use safety of the formwork is ensured. And (5) after the formwork is erected, checking whether a gap exists in the joint part or not, and avoiding the slurry from flowing out. The template, the accessory components and the supporting structure are required to meet the installation requirements of the technical safety standard of building construction templates (JGJ 162-2008).
As a preferred embodiment, before the grouting step, the method further comprises: and coating a mold release agent on the template of the supporting mold, so that the mold release is convenient.
In some embodiments, the formwork supporting template is a steel or wood template, the panel deformation value of the steel template is less than 1.5mm, and the thickness of the wood template is not less than 40 mm. And the deformation value of the template is ensured to be small, so that the filling compactness is ensured. If the deformation value is large, gaps are easy to appear in the cavity along with the deformation of the template in the subsequent solidification process, and the filling effect is influenced.
In some embodiments, the self-compacting soil used in the embodiments of the present invention has good compactness and reasonable curing time, and can be demolded 2 days after pouring.
In some embodiments, if the working surface is not properly framed to create a dam, a closed cavity may be formed by drilling holes with steel sheet piles around the trench, and slurry may be introduced through the holes into the cavity below the roadway.
As a preferred embodiment, the grouting step includes: and pouring the self-compacting soil into the municipal cavity layer by adopting an artificial grouting and/or mechanical grouting mode, wherein the number of layers of the layered pouring at least comprises one layer. The embodiment of the invention adopts a manual grouting and/or mechanical grouting mode to fill the self-compacting soil into the municipal cavity layer by layer, and the number of the layered grouting layers can be one, namely, the grouting is finished at one time; or multi-layer grouting can be carried out, and upper layer grouting is completed before lower layer grout is initially set. When filling thickness exceeded 0.5m or when bigger, in order to ensure the closely knit filling effect of self-compaction soil, adopt the mode of layering grout, realization filling effect that can be better. In some embodiments, the mechanical grouting may be performed by using a grouting pump, and the grouting pressure and speed are controlled to achieve a rapid grouting effect. When the municipal cavity volume is small, manual grouting can be adopted.
Specifically, in step S80, the curing: and (4) filling the municipal cavity filled with the self-compacting soil. According to the embodiment of the invention, the municipal cavity filled with the self-compacting soil is maintained, so that the filled self-compacting soil is not interfered by external loads in the maintenance period, and the integrity of a hardened soil body is ensured.
As a preferred embodiment, the step of maintaining comprises: and (3) curing the poured municipal cavity of the self-compacting soil until the strength of the self-compacting soil reaches over 75% of the permanent strength of the self-compacting soil, wherein the self-compacting soil is not interfered by external loads in a curing period, and the integrity of a hardened soil body is ensured.
In some embodiments, the poured self-compacting soil is cured for 7 days, the strength of the self-compacting soil reaches 75% of the permanent strength, and later construction can be carried out.
In some embodiments, when the temperature is lower than 5 ℃, the construction of backfilling the municipal cavity with the self-compacting soil is not suitable. When the construction is carried out in rainy season, the influence of rainfall on the raw materials is avoided, and the construction is not suitable when the rainfall occurs.
In order to make the above implementation details and operations of the present invention clearly understood by those skilled in the art and to make the advanced performance of the self-compacting soil, the preparation method and the construction method thereof according to the embodiments of the present invention obviously manifest, the above technical solutions are exemplified by a plurality of embodiments.
Example 1
A self-compacting soil backfills a pavement bottom layer cavity formed by dredging engineering excavation of a sediment trap river in the Mazhou river basin in the Bao' an district in Shenzhen city.
Summary of engineering: in the implementation process of the pipe network engineering of the Shenzhen thatch river (Baoan film area) water environment comprehensive improvement engineering project, the geological conditions of a pipe network laying area are complex and mainly comprise mucky soil, miscellaneous filling soil and sandy soil. The project item is located in the Ronggang street administrative area in the Shenzhen province, the Shenzhen city, the Bao district in the Ronggang street, the red star in the Ronggang street, the Red Oriental district in the Ronggang street, the Ronggang, the construction of a rain and sewage pipe network in the Western district, the construction of a sewage pipe network in the Ronggang street, and the total length of the pipe network is 173 km.
The stability of the soil body is poor in the excavation process, and after the grooving foundation pit is formed, the soil body at the bottom of the pit is easy to bulge, so that the roadbed on the two sides of the groove is greatly damaged, and the road pavements on the two sides of the foundation pit are cracked or even collapsed due to uneven settlement. After the foundation pit supporting steel sheet pile is pulled out, the sludge soft soil at the periphery of the foundation trench is easy to deform, the foundation structure can be damaged, the repair cost of the road in the later period is increased, and great hidden danger is caused to the construction safety.
The backfill condition: the construction method of backfilling the pavement cavity with self-compacting soil is adopted, firstly, original-state soil after field excavation is crushed and then passes through a 5-micrometer sieve pore, and most organic and inorganic impurities are removed; then, measuring the water content of undisturbed soil, and determining the content of dry soil in the undisturbed soil; then, calculating according to the water content of the undisturbed soil, wherein the adding proportion of the soil, the water, the cement and the early strength agent is as follows: the mass ratio of the cement to the dry soil in the undisturbed soil is 1: (3-4), wherein the mass ratio of the total mass of the dry soil in the cement and undisturbed soil to the water is 1: (1.5-2.5), wherein the addition amount of the early strength agent is 0.3-1.0% of the mass of the cement. Then, the soil, water, cement and early strength agent are put into a stirring device, and the slurry is the self-compacting soil after stirring. And then the self-compaction soil is poured into the cavity of the pavement bottom plate, and the soil body after curing and hardening is used as a part of the roadbed, so that the roadbed is complete.
③ backfilling effect: as shown in fig. 2, the combination of the self-compacting soil and the surrounding undisturbed soil after filling is very tight, the void ratio is very small, only 0.2%, the deformation of the self-compacting soil after filling is very small, the measured deformation value is only 0.2 mm, and the stability is good. After the self-compacting soil is filled, the strength of the cavity reaches 2.6MPa, the stability of the roadbed structure is enhanced, the problem that the pavement bottom plate is empty due to the loss of sand and soil of the base layer or the deformation of the soil body is solved, the pavement does not break after the construction is finished, and the roadbed strength meets the requirements of subsequent municipal construction operation. The construction method saves the engineering investment, accelerates the construction progress, improves the engineering quality, provides a good solution for the excavation of the pipeline trench, and accords with the development idea of environmental protection and energy conservation.
Example 2
A self-compacting soil backfilled pavement bottom layer cavity formed by excavation of a comprehensive treatment project in the Mazhou river basin in the Bao' an district in Shenzhen city due to pond downward gush.
Summary of engineering: in the implementation process of the pipe network engineering of the Shenzhen Mazhou river water environment comprehensive remediation engineering project, the pipe network construction is wide in distribution and the geological condition of a construction region is complex. The project mainly comprises the construction of a Yanchun village area of a Song Bao street, an industrial upwelling area of a Song Bao street pond, an upwelling area of a Song Bao street pond, a rain and sewage diversion pipe network of a flood bridge head area of the Song Bao street, and the construction of a reclaimed water replenishing project of a Song Bao water quality purification plant. The total length of the pipe network is 125 km. After the pipe network grooves are excavated, soil around partial section grooves is seriously deformed, cavities are formed in the lower portion of a pavement bottom plate, construction operation is affected, mechanical equipment walks on the pavement with the cavities, the pavement can be broken, and hidden dangers are caused to construction safety.
The backfill condition: the construction method of backfilling the pavement cavity with self-compacting soil is adopted, firstly, original state soil of abandoned soil after field excavation is crushed and then passes through a 5-micrometer sieve pore, and most organic and inorganic impurities are removed; then, measuring the water content of undisturbed soil, and determining the content of dry soil in the undisturbed soil; then, calculating according to the water content of the undisturbed soil, wherein the adding proportion of the soil, the water, the cement and the early strength agent is as follows: the mass ratio of the cement to the dry soil in the undisturbed soil is 1: (3-4), wherein the mass ratio of the total mass of the dry soil in the cement and undisturbed soil to the water is 1: (1.5-2.5), wherein the addition amount of the early strength agent is 0.3-1.0% of the mass of the cement. Then, the soil, water, cement and early strength agent are put into a stirring device, and the slurry is the self-compacting soil after stirring. And then the self-compaction soil is poured into the cavity of the pavement bottom plate, and the soil body after curing and hardening is used as a part of the roadbed, so that the roadbed is complete.
Effect evaluation: the self-compacting soil takes the site waste soil as a raw material, and cement, water and additives are mixed, so that the utilization of the site solid waste is maximized, the engineering cost is reduced, and the emission of the solid waste is reduced. After the construction method is used, the self-compacting soil is tightly combined with original state soil around the cavity after being filled, the strength of the filled cavity reaches 3.2MPa, the void ratio is small and is only 0.3%, the filling of the pavement bottom plate can meet the construction requirement, the roadbed strength can meet the requirement of subsequent municipal construction operation, and the bearing capacity of the pavement is improved. The investigation of the recovered road surface did not show the phenomenon of road surface fracture. The construction method replaces the traditional pavement breaking method, reduces the damage of construction to the pavement, improves the construction efficiency, saves the labor cost and the material cost, saves the construction period, ensures the engineering progress, has simple operation and conforms to the concept of environmental protection and sustainable development.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The preparation method of the self-compacting soil is characterized by comprising the following steps:
obtaining undisturbed soil, and determining the water content of the undisturbed soil after the undisturbed soil is subjected to mud-breaking and impurity-removing treatment;
obtaining cement, wherein the mass ratio of the cement to dry soil in the undisturbed soil is 1: (3-4);
obtaining water, wherein the ratio of the total mass of the cement and the dry soil in the undisturbed soil to the total mass of the water in the self-compacting soil is 1: (1.5-2.5);
obtaining an additive, wherein the addition amount of the additive is 0.3-1.0% of the mass of the cement;
and mixing and stirring the undisturbed soil, the cement, the water and the additive according to the proportion to obtain the self-compacting soil.
2. The method of preparing self-compacting soil according to claim 1, wherein the self-compacting soil has a flow value of 160mm to 200 mm; the maximum dry density of the self-compacting soil is greater than that of the undisturbed soil; the unconfined compressive strength of the dried self-compacting soil is 2-8 MPa.
3. The method for preparing self-compacting soil according to claim 1 or 2, wherein the undisturbed soil is soil excavated from municipal works for cavities to be backfilled, and comprises the following steps: at least one of sandy soil and clay; and/or;
the additive is selected from: at least one of an early strength agent and a water reducing agent; and/or the presence of a gas in the gas,
the cement is selected from: ordinary portland cement of PO 32.5.
4. The method of preparing self-compacting soil according to claim 3, wherein said additive is selected from the group consisting of: at least one of sodium sulfate, triethanolamine and calcium chloride; and/or the presence of a gas in the gas,
the maximum dry density of the self-compacting soil is 2g/cm3～2.2g/cm3。
5. The method for preparing self-compacting soil according to any one of claims 1, 2 or 4, wherein the step of subjecting the undisturbed soil to mud-breaking and impurity-removing treatment comprises: crushing the undisturbed soil, and then enabling the crushed undisturbed soil to pass through a sieve pore of 5-10 mm, wherein the content of organic matters in the undisturbed soil is smaller than 8%; and/or the presence of a gas in the gas,
the mixing and stirring treatment time is 2-5 minutes.
6. A self-compacting soil, comprising: the soil-cement composite material comprises undisturbed soil, cement, water and an additive, wherein the mass ratio of the cement to dry soil in the undisturbed soil is 1: (3-4), wherein the ratio of the total mass of the cement and the dry soil in the undisturbed soil to the total mass of the water is 1: (1.5-2.5), wherein the addition amount of the additive is 0.3-1.0% of the mass of the cement.
7. A construction method for backfilling municipal cavities with self-compacting soil is characterized by comprising the following steps:
preparing self-compacting soil: measuring the water content of undisturbed soil of the municipal cavity, and preparing self-compacting soil according to the water content of the undisturbed soil;
grouting: pouring the self-compacting soil into the municipal cavity;
and (5) maintenance: and curing the municipal cavity filled with the self-compacting soil.
8. The method of claim 7, further comprising, prior to the grouting step: a formwork is supported at the periphery of the municipal cavity; the step of supporting the formwork comprises: the distance between the surrounding baffle template of the supporting mold and the edge of the municipal cavity is 20-30 cm, and the surrounding baffle template of the supporting mold is 20-30 cm higher than the highest horizontal plane of the municipal cavity.
9. The method of claim 8, further comprising, prior to the grouting step: coating a mold release agent on the template of the supporting mold; and/or the presence of a gas in the gas,
the grouting step comprises: and pouring the self-compacting soil into the municipal cavity layer by adopting an artificial grouting and/or mechanical grouting mode, wherein the number of layers of the layered pouring at least comprises one layer.
10. The construction method for backfilling municipal cavities with self-compacting soil according to any one of claims 7 to 9, wherein the maintenance step comprises: and curing the poured municipal cavity of the self-compacting soil until the strength of the self-compacting soil reaches more than 75% of the permanent strength of the self-compacting soil, wherein the self-compacting soil is not interfered by external loads in a curing period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910375820.1A CN111908853A (en) | 2019-05-07 | 2019-05-07 | Self-compacting soil, preparation method thereof and construction method for backfilling municipal cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910375820.1A CN111908853A (en) | 2019-05-07 | 2019-05-07 | Self-compacting soil, preparation method thereof and construction method for backfilling municipal cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111908853A true CN111908853A (en) | 2020-11-10 |
Family
ID=73241687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910375820.1A Pending CN111908853A (en) | 2019-05-07 | 2019-05-07 | Self-compacting soil, preparation method thereof and construction method for backfilling municipal cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111908853A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115504723A (en) * | 2022-11-03 | 2022-12-23 | 湖南宏禹工程集团有限公司 | Plastic slurry suitable for karst development stratum seepage-proofing grouting |
| CN115947557A (en) * | 2023-01-06 | 2023-04-11 | 中绎建设科技集团有限公司 | Additive for improving strength of self-compacting solidified soil |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101157539A (en) * | 2007-09-28 | 2008-04-09 | 北京工业大学 | Non-compacted backfill |
| WO2009118376A1 (en) * | 2008-03-28 | 2009-10-01 | Poligate Limited | Method for base or foundation reinforcement |
| CN101857409A (en) * | 2010-05-28 | 2010-10-13 | 北京工业大学 | Flowing backfill and preparation and construction method thereof |
| 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 |
| JP2018127529A (en) * | 2017-02-07 | 2018-08-16 | 三和石産株式会社 | Fluid backfilling material |
-
2019
- 2019-05-07 CN CN201910375820.1A patent/CN111908853A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101157539A (en) * | 2007-09-28 | 2008-04-09 | 北京工业大学 | Non-compacted backfill |
| WO2009118376A1 (en) * | 2008-03-28 | 2009-10-01 | Poligate Limited | Method for base or foundation reinforcement |
| CN101857409A (en) * | 2010-05-28 | 2010-10-13 | 北京工业大学 | Flowing backfill and preparation and construction method thereof |
| 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 |
| JP2018127529A (en) * | 2017-02-07 | 2018-08-16 | 三和石産株式会社 | Fluid backfilling material |
Non-Patent Citations (2)
| Title |
|---|
| CHEN RP: ""Uplift tests on full-scale pipe segment in lumpy soft clay backfill"", 《CANADIAN GEOTECHNICAL JOURNAL》 * |
| 谢鸿: ""高流态自密实灌注混凝土配合比设计与应用"", 《云南水力发电》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115504723A (en) * | 2022-11-03 | 2022-12-23 | 湖南宏禹工程集团有限公司 | Plastic slurry suitable for karst development stratum seepage-proofing grouting |
| CN115504723B (en) * | 2022-11-03 | 2023-11-17 | 湖南宏禹工程集团有限公司 | Plastic slurry suitable for anti-seepage grouting of karst development stratum |
| CN115947557A (en) * | 2023-01-06 | 2023-04-11 | 中绎建设科技集团有限公司 | Additive for improving strength of self-compacting solidified soil |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101709125B1 (en) | Rapid hardening and pseudo-plastic backfill material for sewer pipe and Constructing method using the same | |
| CN104402339A (en) | Pervious concrete and construction method thereof | |
| CN101391902A (en) | Foaming concrete made by waste and old concrete and production method thereof and use | |
| CN107572956A (en) | A kind of premixing fluidised form solidified earth | |
| CN113636809A (en) | Collapsible loess aggregate filling material | |
| CN111676987A (en) | Construction method for backfilling construction of construction fertilizer tank by vibrating, slurry-flushing and ramming method | |
| Zhu et al. | Utilization of excavated loess and gravel soil in controlled low strength material: Laboratory and field tests | |
| CN111908853A (en) | Self-compacting soil, preparation method thereof and construction method for backfilling municipal cavity | |
| CN106087880B (en) | A kind of dam that 300 meter level is high and its construction technology | |
| CN111268963A (en) | Road inspection well and manufacturing process and construction method thereof | |
| KR100805676B1 (en) | Making method of fluid soil | |
| CN105672203B (en) | A kind of plugging construction method of dykes and dams RCCP | |
| CN115233524B (en) | Method for rapidly restoring road excavation | |
| CN115613595A (en) | Application of waste concrete as backfill material and backfill construction method thereof | |
| CN114411921B (en) | Road reconstruction and extension roadbed drainage ditch masonry method and structure | |
| CN213115347U (en) | Dampproof ground | |
| CN114656200A (en) | Backfill material prepared from engineering waste slurry and preparation method thereof | |
| JP2004345885A (en) | Hydraulic composition, backfill material for ground using the same, non-high strength hardened part structural material and backfill process for excavated ground | |
| WO2021068235A1 (en) | High-strength curing agent application method for peat soil | |
| CN111593627A (en) | Permeable concrete brick pavement system based on solid waste material and paving method thereof | |
| CN111088803A (en) | Pipe ditch excavation and backfilling construction method | |
| CN110439014A (en) | A kind of underground stratiform discharge structure and its construction method | |
| Maher et al. | MAT-758: Constructability Benefits of the Use of Lightweight Foamed Concrete Fill (LFCF) in Pavement Applications | |
| CN210947064U (en) | Rainwater pipeline backfills structure suitable for silt matter weak soil | |
| CN115521117B (en) | Material for pipe backfill and method for producing the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201110 |
|
| RJ01 | Rejection of invention patent application after publication |