CN107151122A - Dry powder and mortar mixing method for shield grouting - Google Patents
Dry powder and mortar mixing method for shield grouting Download PDFInfo
- Publication number
- CN107151122A CN107151122A CN201710378321.9A CN201710378321A CN107151122A CN 107151122 A CN107151122 A CN 107151122A CN 201710378321 A CN201710378321 A CN 201710378321A CN 107151122 A CN107151122 A CN 107151122A
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- Prior art keywords
- dry powder
- mortar
- mixing
- grouting
- shield
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- 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.)
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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
- C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust cements
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The present invention provides a kind of dry powder and mortar mixing method for shield grouting, and its step includes：Dry powder and mortar grout coordinate ratio is determined, the mass percent composition of the dry powder and mortar includes 60 to 65wt% sand, 15 to 18wt% flyash, 2 to 4wt% bentonite, 4 to 8wt% lime, 0.01 to 0.02wt% outer-penetrating agent and 13 to 15wt% water；Mixing dry powder and mortar；Dry powder and mortar is transported to job site mixing plant；Live mixing simultaneous grouting slurry according to the actual requirements；The good slurries of mixing are injected into slurry storage tank.The present invention solves the problem of effectively can not changing simultaneous grouting slurry according to the actual propulsion situation of shield in existing construction method by preceding solution, mixed uniform, without caking and mix water requirement be less than 20% (mass percent of dry mash) dry powder and mortar, and then the mixture for making dry powder and mortar be formed after adding water has good mobility, fillibility, water-retaining property and slump retaining, and the haulage time with saving slurries, according to the actual requirements adjustment slurries, reduction environmental pollution and other effects.
Description
Technical field
The present invention relates to Shield Construction Technique field, relate in particular to a kind of for synchronous grouting during shield-tunneling construction
The dry powder and mortar mixing method for shield grouting.
Background technology
With developing rapidly for urban municipal construction and track traffic, the underground space is constantly developed, shield
Method construction is also more and more extensive in the use of subway tunnel, in using shield method tunnel construction, how effectively to control ground
Sedimentation, is always the emphasis of tunnel industry concern.Synchronous grouting is effective control surface subsidence in progradation, is reduced to soil
The effective ways of body disturbance.
The slurries of synchronous grouting mainly use finished product slurries in existing construction method, can only pass through in use
Adjustment grouting amount adapts to actual conditions, it is impossible to meet the need during practice of construction to simultaneous grouting slurry from many aspects
Ask.In existing method, the concrete measure of this problem not can effectively solve the problem that.
The content of the invention
In view of the foregoing, the present invention provides a kind of dry powder and mortar mixing method for shield grouting, existing to solve
Effectively the problem of situation changes simultaneous grouting slurry can not be promoted in construction method according to shield is actual.
To achieve the above object, the present invention adopts the technical scheme that a kind of dry powder and mortar for shield grouting of offer is mixed
The step of method processed, methods described, includes：
Determine dry powder and mortar grout coordinate ratio, the mass percent composition of the dry powder and mortar include 60 to 65wt% sand,
15 to 18wt% flyash, 2 to 4wt% bentonite, 4 to 8wt% lime, 0.01 to 0.02wt% outer-penetrating agent and
13 to 15wt% water；
Mixing dry powder and mortar；
Dry powder and mortar is transported to job site mixing plant；
Live mixing simultaneous grouting slurry according to the actual requirements；
The good slurries of mixing are injected into slurry storage tank.
Wherein, the composition and ratio of the dry powder and mortar includes 900 to 1100kg/m3Sand, 300 to 400kg/m3Fine coal
Ash, 50kg/m3Bentonite, 80kg/m3Lime, 3kg/m3Outer-penetrating agent and 360kg/m3Water.
Wherein, the composition and ratio of the outer-penetrating agent include 1 to 1.4wt% methylcellulose by percentage to the quality,
29.1 to 39.1wt% naphthalene water reducer, 0.6 to 1wt% Escins, 28.9 to 44.9wt% sodium bentonite；22 to
32wt% calcium hydroxide.
Wherein, it is the geological condition and tunnel according to shield driving in the step of determination dry powder and mortar grout coordinate ratio
Stratum where axis determines that simultaneous grouting slurry is matched.
Wherein, the performance requirement of the dry powder and mortar includes：Slump 120-160mm；Density >=1900kg m-3；Shearing
Yield strength ＞ 800 (20h)/Pa；Pressure-flow study amount ＜ 20mL；Bleeding rate ＜ 5%；Water retention >=88%；And/or pH value ＜
12。
Wherein, it is by concrete mixer truck in the step of described transport dry powder and mortar to job site mixing plant
The transport of dry powder and mortar is carried out, to ensure the mobility of dry powder and mortar.
Wherein, it is in underground according to shield in the step of the live mixing simultaneous grouting slurry according to the actual requirements
Propulsion situation and the situation of surface subsidence, analysis obtain the demand to simultaneous grouting slurry.
Wherein, it is by controlling dry powder sand in the step of the live mixing simultaneous grouting slurry according to the actual requirements
The amount of water of slurry obtains the simultaneous grouting slurry for meeting demand with mixing.
Wherein, in the step of described dry powder and mortar is transported to job site mixing plant, need to avoid concrete mixer truck
Interior incorporation impurity, in dry powder and mortar from during concrete mixer truck is transferred to Site station, need to avoid dry powder and mortar from mixing
Enter impurity.
Wherein, in the step of slurries that mixing is good inject slurry storage tank, connection mixing plant need to be cleaned in advance to storage
The Grouting Pipe of stock tank, to avoid slurries from mixing impurity when being shifted through pipeline.
The present invention makes it have following beneficial effect as a result of above technical scheme：
(1) present invention by aforementioned method steps, result in mix uniform, without caking and mix water requirement be less than 20%
The dry powder and mortar of (mass percent of dry mash), and then the mixture for making dry powder and mortar be formed after adding water has good flowing
Property, fillibility, water-retaining property and slump retaining.
(2) present invention can save the haulage time of slurries, ensure performance, the basis of slurries by aforementioned method steps
Actual demand adjusts slurries, meanwhile, it can also effectively reduce environmental pollution using dry powder and mortar.
Brief description of the drawings
Fig. 1 is step schematic flow sheet of the present invention for the dry powder and mortar mixing method of shield grouting.
Embodiment
For the benefit of to the understanding of the present invention, illustrated below in conjunction with drawings and Examples.
Referring to Fig. 1, showing that the present invention is used for the dry powder and mortar mixing method flow diagram of shield grouting.The present invention is used for
The dry powder and mortar mixing method of shield grouting is applied generally in all shield constructions.The method provided using the present invention, is made
With dry powder and mortar and at the scene after mixing, can solve the problem that in existing method effectively can not adjust synchronous according to actual propulsion situation
The problem of grouting serous fluid.
Below in conjunction with the accompanying drawings to the present invention is using Novel dry powder mortar and the method for mixing is illustrated at the construction field (site).This
The dry powder and mortar mixing method for shield grouting provided is invented, its step includes：
Step S1：Determine dry powder and mortar grout coordinate ratio, the mass percent composition of the dry powder and mortar include 60 to
65wt% sand, 15 to 18wt% flyash, 2 to 4wt% bentonite, 4 to 8wt% lime, 0.01 to 0.02wt%
Outer-penetrating agent and 13 to 15wt% water.Specifically, step S1 is to the investigation of address situation and to tunnel according to early stage
The analysis of soil layer where axis, with reference to the geological condition of shield driving, comprehensive many-sided consideration determines the synchronization of this requirement of engineering
The proportioning of grouting serous fluid, and then determine the proportioning of dry powder and mortar.
More specifically, illustrating the selection method of dry powder and mortar of the present invention below：
(1) sand：Sand directly produces influence, wherein sand as the important component in slurries on the properties of slurries
Species, level is matched somebody with somebody, the change of modulus of fineness, clay content all to size performance plays a significant role, and is shown in experimentation, synchronous
Sand used in grouting serous fluid is river sand, and clay content is controlled within 3%, and the water-retaining property of slurries is also matched somebody with somebody, carefully with the level of sand
Modulus is read linear, the level of sand is with better, and modulus of fineness is bigger, then the bleeding rate of slurries is substantially reduced, using reading mould in detail
Number is that the size performance of thin river sand mixing in 2.2~2.6 is preferable.
(2) lime：Lime is strong to increase slurries early stage shearing resistance surrender as the catalyst that hydration reaction is carried out with flyash
Degree has important effect, and the hydrolysis degree of white lime is high, and Ca (OH) 2 can be with the active SiO2 (glass in flyash in lime
Body SiO2) and active al2o3 (vitreum Al2O3) hydration reaction occurs under certain condition, play raising the slurries body later stage knot
The effect of solid strength；The contents of white lime Ca (OH) 2 are high, after being mixed with flyash, hydration reaction speed, and slurries can be
The larger yield strength of early formation, therefore, it should be used as slurries from the white lime using the production of saturated vapor process
Raw material.
(3) flyash：Flyash directly determines slurries and easy as the major gelled material in slurries, its quality
Property.As the workability of slurries can be improved for binder materials, play a part of parcel sand and each component raw material, while and Ca
(OH) 2 or other alkaline earth metal hydroxides chemically react, generation with hydraulic gelling property compound, be a kind of increasing
The material of reinforcement degree and durability.In experimentation, by comparing low calcium ash and high calcium ash, the fine coal grey type of different calcium contents
Class, has drawn slurries of the low calcium ash compared with high calcium ash mixing, and workability is better, and bleeding rate and slump-loss are smaller, and
The later stage knot solid strength of slurries is high, and the high flyash slump-loss of calcium content is very fast, therefore, from the powder of low calcium content
Coal ash carries out the mixing of slurries.
(4) bentonite：Bentonite is as the binder materials of increase slurries pump-conveying property, water conservation, thickening power to slurries
Substantially, but bentonitic use volume should be controlled within certain limit, tied with the filling mobility and later stage that ensure slurries
Solid strength, the slurries effect from the good sodium bentonite mixing of expansion effect will get well compared with calcium base.
In the embodiment of the present invention, using big proportion slurries, grout coordinate ratio is following, and (weight compares kg/m3)；
Wherein, the composition and ratio of the outer-penetrating agent include 1 to 1.4wt% methylcellulose by percentage to the quality,
29.1 to 39.1wt% naphthalene water reducer, 0.6 to 1wt% Escins, 28.9 to 44.9wt% sodium bentonite；22 to
32wt% calcium hydroxide.In the embodiment of the present invention, all composition materials of the outer-penetrating agent are pulverulent material.Wherein, institute
Methyl cellulose ether is stated for 20000-60000 viscosity；Described sodium bentonite fineness≤20%.
Step S2：Mixing dry powder and mortar；Specifically, need to choose raw material before mixing dry powder and mortar, it is ensured that slurry
The performance of liquid is not affected by the quality problems of raw material.It is dry according to what is determined in step S1 after the completion of raw material are chosen
The proportioning of powder mortar, mixing dry powder and mortar.Before mixing dry powder and mortar, it is to be ensured that the cleaning in the place of mixing dry powder and mortar,
There can not be impurity to be mixed into during mixing.
After the completion of dry powder and mortar mixing, the performance for the dry powder and mortar that need to be completed to mixing is detected, qualified detecting
Afterwards, step S3 is performed.Detection requirement see the table below：
| Performance indications | It is required that |
| The slump/mm | 120-160 |
| Density/kg m-3 | ≥1900 |
| Shear yield strength (20h)/Pa | ＞ 800 |
| Pressure-flow study amount/ml | ＜ 20 |
| Bleeding rate/% | ＜ 5 |
| Water retention/% | ≥88 |
| PH value | ＜ 12 |
Step S3：Dry powder and mortar is transported to job site mixing plant；In the embodiment of the present invention, step S3 is by mixed
Mixer lorry carries out the transport of dry powder and mortar, to ensure the mobility of dry powder and mortar.Further, it is necessary to ensure dry powder and mortar in fortune
Other impurities can not be mixed in defeated process, to ensure can not there is miscellaneous in concrete mixer truck when being fitted into concrete mixer truck
Matter, in dry powder and mortar from dry powder and mortar during concrete mixer truck is transferred to Site station, need to be avoided to mix impurity.
Step S4：Live mixing simultaneous grouting slurry according to the actual requirements；Ensure that the place of live mixing synchronous grouting is clear
It is clean, prevent being mixed into for impurity.Specifically, step S4 is that situation and the situation of surface subsidence, analysis are promoted in underground according to shield
Obtain the demand to simultaneous grouting slurry.In the embodiment of the present invention, step S4 be by control the amount of water of dry powder and mortar with
Mixing obtains the simultaneous grouting slurry for meeting demand, the injection rate of water strictly need to be controlled, so that slurries better meet reality
The demand of situation.Specifically, in the embodiment of the present invention, 280L water correspondence slump 140mm is added, the 290L water slumps are added
160mm, adds 270L water slumps 120mm.
Step S5：The good slurries of mixing are injected into slurry storage tank；Ensure simultaneous grouting slurry conveyance conduit and slurry storage tank
Cleaning, reduces being mixed into for impurity.In the embodiment of the present invention, need to clean in advance connection mixing plant to slurry storage tank Grouting Pipe, with
Slurries are avoided to mix impurity when being shifted through pipeline.Preferably, during the entire process of slurries are into slurry storage tank to synchronous grouting, all
Need strictly to control cleaning, reduce being mixed into for impurity, it is ensured that the performance of slurries.
To sum up, the present invention is by preceding solution, to utilize prefabricated dry powder and mortar mixing more at shield-tunneling construction scene
It can adapt to the simultaneous grouting slurry in actual demand.In addition, by the process described above, solving in existing construction method
Effectively the problem of situation changes simultaneous grouting slurry can not be promoted according to actual.Also there is obvious effect to environmental protection simultaneously
Really.
The present invention is described in detail above in association with drawings and Examples, those skilled in the art can basis
Described above makes many variations example to the present invention.Thus, some of embodiment details should not constitute limitation of the invention,
The present invention regard the scope defined using appended claims as protection scope of the present invention.
Claims (10)
1. a kind of dry powder and mortar mixing method for shield grouting, it is characterised in that include the step of methods described：
Determine dry powder and mortar grout coordinate ratio, the mass percent composition of the dry powder and mortar include 60 to 65wt% sand, 15 to
18wt% flyash, 2 to 4wt% bentonite, 4 to 8wt% lime, 0.01 to 0.02wt% outer-penetrating agent and 13 to
15wt% water；
Mixing dry powder and mortar；
Dry powder and mortar is transported to job site mixing plant；
Live mixing simultaneous grouting slurry according to the actual requirements；
The good slurries of mixing are injected into slurry storage tank.
2. the dry powder and mortar mixing method according to claim 1 for shield grouting, it is characterised in that：
The composition and ratio of the dry powder and mortar includes 900 to 1100kg/m3Sand, 300 to 400kg/m3Flyash, 50kg/m3
Bentonite, 80kg/m3Lime, 3kg/m3Outer-penetrating agent and 360kg/m3Water.
3. the dry powder and mortar mixing method according to claim 1 or 2 for shield grouting, it is characterised in that：
The composition and ratio of the outer-penetrating agent include 1 to 1.4wt% methylcellulose by percentage to the quality, 29.1 to
39.1wt% naphthalene water reducer, 0.6 to 1wt% Escins, 28.9 to 44.9wt% sodium bentonite；22 to 32wt%'s
Calcium hydroxide.
4. the dry powder and mortar mixing method according to claim 1 for shield grouting, it is characterised in that：
It is the geological condition according to shield driving and tunnel axis location in the step of determination dry powder and mortar grout coordinate ratio
Layer determines simultaneous grouting slurry proportioning.
5. the dry powder and mortar mixing method according to claim 1 for shield grouting, it is characterised in that in the mixing
In the step of dry powder and mortar, complete after dry powder and mortar mixing, need to first carry out performance requirement detection, then dry powder and mortar is transported to applying
Work Site station；Wherein, the performance requirement of the dry powder and mortar includes：
Slump 120-160mm；
Density >=1900kg m-3；
Shear yield strength ＞ 800 (20h)/Pa；
Pressure-flow study amount ＜ 20mL；
Bleeding rate ＜ 5%；
Water retention >=88%；And/or
PH value ＜ 12.
6. the dry powder and mortar mixing method according to claim 1 for shield grouting, it is characterised in that：
It is that dry powder sand is carried out by concrete mixer truck in the step of described transport dry powder and mortar to job site mixing plant
The transport of slurry, to ensure the mobility of dry powder and mortar.
7. the dry powder and mortar mixing method according to claim 6 for shield grouting, it is characterised in that：
In the step of described transport dry powder and mortar to job site mixing plant, incorporation in concrete mixer truck need to be avoided miscellaneous
Matter, in dry powder and mortar from dry powder and mortar during concrete mixer truck is transferred to Site station, need to be avoided to mix impurity.
8. the dry powder and mortar mixing method according to claim 1 for shield grouting, it is characterised in that：
In the step of the live mixing simultaneous grouting slurry according to the actual requirements, be according to shield promoted in underground situation and
The situation of surface subsidence, analysis obtains the demand to simultaneous grouting slurry.
9. the dry powder and mortar mixing method for shield grouting according to claim 1 or 8, it is characterised in that：
It is the amount of water by controlling dry powder and mortar in the step of the live mixing simultaneous grouting slurry according to the actual requirements
The simultaneous grouting slurry for meeting demand is obtained with mixing.
10. the dry powder and mortar mixing method according to claim 1 for shield grouting, it is characterised in that：
In the step of slurries that mixing is good inject slurry storage tank, connection mixing plant need to be cleaned in advance to the slip casting of slurry storage tank
Pipe, to avoid slurries from mixing impurity when being shifted through pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710378321.9A CN107151122A (en) | 2017-05-25 | 2017-05-25 | Dry powder and mortar mixing method for shield grouting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710378321.9A CN107151122A (en) | 2017-05-25 | 2017-05-25 | Dry powder and mortar mixing method for shield grouting |
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| Publication Number | Publication Date |
|---|---|
| CN107151122A true CN107151122A (en) | 2017-09-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710378321.9A Pending CN107151122A (en) | 2017-05-25 | 2017-05-25 | Dry powder and mortar mixing method for shield grouting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868781A (en) * | 2018-05-28 | 2018-11-23 | 中铁五局集团有限公司 | A kind of shield construction method for shale sandy silt soil stratum |
| CN113173755A (en) * | 2021-04-21 | 2021-07-27 | 中建材创新科技研究院有限公司 | High-slurry-yield and high-consolidation-rate dry powder shield synchronous grouting material and production process thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103362522A (en) * | 2013-07-08 | 2013-10-23 | 上海城建物资有限公司 | Dry powder type synchronous grouting construction technology |
-
2017
- 2017-05-25 CN CN201710378321.9A patent/CN107151122A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103362522A (en) * | 2013-07-08 | 2013-10-23 | 上海城建物资有限公司 | Dry powder type synchronous grouting construction technology |
Non-Patent Citations (1)
| Title |
|---|
| 土建教材编写组: "《建筑材料》", 30 April 1984, 上海科学技术出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108868781A (en) * | 2018-05-28 | 2018-11-23 | 中铁五局集团有限公司 | A kind of shield construction method for shale sandy silt soil stratum |
| CN113173755A (en) * | 2021-04-21 | 2021-07-27 | 中建材创新科技研究院有限公司 | High-slurry-yield and high-consolidation-rate dry powder shield synchronous grouting material and production process thereof |
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