CN111470817A - Light slurry for shield synchronous grouting - Google Patents
Light slurry for shield synchronous grouting Download PDFInfo
- Publication number
- CN111470817A CN111470817A CN202010173814.0A CN202010173814A CN111470817A CN 111470817 A CN111470817 A CN 111470817A CN 202010173814 A CN202010173814 A CN 202010173814A CN 111470817 A CN111470817 A CN 111470817A
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- China
- Prior art keywords
- slurry
- shield
- parts
- light
- water
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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
- C04B28/04—Portland cements
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- 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
- C04B2111/40—Porous or lightweight materials
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- 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
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- 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
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- 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
Abstract
The invention discloses light slurry for shield synchronous grouting, which comprises, by weight, 200-300 parts of cement, 50-160 parts of light aggregate, 600-800 parts of fly ash, 1.0-1.6 parts of water reducing agent, 10-16 parts of flocculating agent, 15-25 parts of coagulation regulator and 600-750 parts of water. Compared with the prior art, the volume weight of the light slurry for shield synchronous grouting is 1.0-1.4 kg/m3The mortar is far less than the existing synchronous mortar, and can not sink to the bottom pad support pipe piece or be taken away by the circulating slurry of the lower slurry discharging port, so that the loss after the synchronous slurry is injected is greatly reduced, the synchronous grouting effect of the shield is obviously improved, and the pipe piece floating in the shield construction of the water-rich section can be effectively prevented. In addition, the light slurry for shield synchronous grouting does not disperse in water, the 3d compressive strength in water can reach more than 0.5MPa, the final setting time is less than 15h, and the method is particularly suitable for synchronous shields in tunnelsThe construction gap between the pipe piece and the surrounding rock is filled in the tunneling construction, and the engineering quality can be better ensured.
Description
Technical Field
The invention belongs to the field of materials, and particularly relates to light slurry for shield synchronous grouting.
Background
At present, in tunnel shield tunnelling construction, the building space must be filled with the slip casting thick liquid between section of jurisdiction and the country rock, and the purpose of slip casting is: (1) filling the shield tail building gap in time, supporting the rock mass around the pipe piece, and controlling the ground surface settlement; (2) the condensed slurry is used as a first waterproof barrier of the shield construction tunnel, so that the waterproof capability of the tunnel is enhanced; (3) the shield tunnel structure provides early stability for the duct piece, integrates the duct piece with surrounding rock masses, is favorable for controlling the shield tunneling direction, and ensures the final stability of the shield tunnel.
However, the problem of 'pipe piece floating' can often appear in the rich water district slip casting of hard rock, cause the incident easily, and the tunnel quality also is difficult to guarantee. The main reasons for the 'tube piece floating up' are as follows: the pipe piece self has upward buoyancy in the rich water section, and the synchronous 'mortar' slurry commonly used at present is very large in volume weight due to the fact that the main component is 'sand' (the proportion is about 2/5-3/5), and the synchronous mortar can quickly sink to the lower side of the pipe piece after being injected, is very easy to be taken away by circulating slurry to cause the loss of the injected mortar, so that the synchronous grouting effect is poor, and the 'pipe piece floating' phenomenon is often caused.
In view of the above, there is a need to provide a light slurry for shield synchronous grouting, which can effectively prevent the duct piece from floating upward.
Disclosure of Invention
The invention aims to: overcomes the defects of the prior art, and provides the light slurry for shield synchronous grouting, which can effectively prevent the duct piece from floating upwards.
In order to achieve the purpose, the invention provides light slurry for shield synchronous grouting, which comprises, by weight, 200-300 parts of cement, 50-160 parts of light aggregate, 600-800 parts of fly ash, 1.0-1.6 parts of a water reducing agent, 10-16 parts of a flocculating agent, 15-25 parts of a coagulation regulator and 600-750 parts of water.
As an improvement of the light-weight slurry for shield grouting, the cement is Portland cement.
As an improvement of the light slurry for shield grouting, the cement is one or more of 42.5-grade ordinary portland cement, 42.5R-grade portland cement, 52.5R-grade portland cement and 32.5-grade portland cement, and the alkalinity of the cement can promote the hydration and the coagulation of the fly ash and ensure the strength of the slurry after hardening.
As an improvement of the light slurry for shield grouting, the light aggregate is expanded perlite particles.
As an improvement of the light slurry for shield grouting, the true density of the expanded perlite particles is less than 0.60.
As an improvement of the light slurry for shield grouting, the particle size of the expanded perlite particles is 20-120 meshes.
As an improvement of the light slurry for shield grouting, the fly ash is first-grade fly ash or second-grade fly ash.
As an improvement of the light slurry for shield grouting, the water reducing agent is a polycarboxylate powder water reducing agent, so that the water consumption can be effectively reduced, the slurry fluidity is improved, and the strength of the slurry after hardening is improved.
As an improvement of the light slurry for shield grouting, the flocculant is a polysaccharide flocculant which has small influence on the setting time and can improve the dispersion resistance and the water flow impact resistance of the grouting material in water.
As an improvement of the light slurry for shield grouting, the flocculant contains 40-60% of polysaccharide.
As an improvement of the light slurry for shield grouting, the flocculant is a UWB-II type high anti-dispersion polysaccharide flocculant.
As an improvement of the light slurry for shield grouting, the coagulation regulator is selected from one or more of triethanolamine, calcium formate and calcium chloride, the cement can be quickly hydrated by adding the coagulation regulator, and the light slurry is used as a fly ash activity excitant to promote the hydration of fly ash, so that the coagulation time of the slurry is shortened, and the early strength is improved.
As an improvement of the light slurry for shield synchronous grouting, the light slurry for shield synchronous grouting comprises, by weight, 250 parts of 42.5-grade ordinary silica cement, 750 parts of fly ash, 50 parts of expanded perlite particles, 1.6 parts of a water reducing agent, 16 parts of a flocculating agent, 20 parts of a coagulation regulator and 700 parts of water.
Compared with the prior art, the light slurry for shield synchronous grouting has the following technical effects:
1) the bulk density is 1.0-1.4 kg/m3The mortar is far smaller than the prior synchronous mortar, can not quickly sink to the bottom support pipe piece or be taken away by the circulating slurry of a lower slurry discharge port, greatly reduces the loss after the synchronous slurry is injected, obviously improves the synchronous grouting effect of the shield, and can effectively prevent the pipe piece from floating upwards in the shield construction of a water-rich section;
2) the light slurry for shield synchronous grouting is not dispersed in water, the 3d compressive strength in water can reach more than 0.5MPa, the final setting time is less than 15h, and the light slurry is particularly suitable for filling building gaps between duct pieces and surrounding rocks in tunnel synchronous shield tunneling construction and can better ensure the engineering quality;
3) the raw materials are easy to obtain, and the cost is saved.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention more clear, the present invention is further described in detail with reference to the following embodiments. It should be understood that the embodiments described in this specification are only for the purpose of explaining the present invention and are not intended to limit the present invention.
Example 1
The light slurry for shield grouting comprises, by weight, 250kg of 42.5-grade ordinary silica cement, 750kg of first-grade fly ash, 50kg of 20-mesh expanded perlite particles (the true density is less than 0.60), 1.0kg of polycarboxylate powder water reducing agent, 20kg of coagulation regulator, 10kg of UWB-II type high-anti-dispersion polysaccharide flocculant and 650kg of water.
The volume weight of the light slurry for shield grouting is 1400kg/m3Initial setting time is 640min, and final setting time is 800 min; does not disperse and segregate in water; the fluidity can still be kept at 195mm or above after 3 hours; the 3d strength is 0.7MPa, the 28d strength is more than 2.5MPa, and the pipe piece floating phenomenon caused by large loss of slurry can be effectively prevented during construction of a hard rock water-rich zone.
Examples 2 to 12
Examples 2 to 12 are substantially the same as example 1, except that the composition of each substance is different, and the specific parameters and performance results are shown in tables 1 and 2.
TABLE 1 light weight slurry for shield grouting composition of each example
TABLE 2 light weight grout for shield grouting Performance parameters for each example
As can be seen from Table 2, the 3d compressive strength of the light slurry for shield grouting can reach more than 0.5MPa in water, and the volume weight is 1120kg/m3～1420kg/m3The fluidity of the slurry can be maintained for 3h by more than 195mm, the requirement of a synchronous grouting pump on the fluidity of the slurry can be met, and meanwhile, the slurry does not disperse, segregate or bleed in water, and the calculus rate is 100%.
Compared with the prior art, the light slurry for shield grouting has the following technical effects:
1) the bulk density is 1.0-1.4 kg/m3The mortar is far smaller than the prior synchronous mortar, can not quickly sink to the bottom support pipe piece or be taken away by the circulating slurry of a lower slurry discharge port, greatly reduces the loss after the synchronous slurry is injected, obviously improves the synchronous grouting effect of the shield, and can effectively prevent the pipe piece from floating upwards in the shield construction of a water-rich section;
2) the light slurry for shield synchronous grouting is not dispersed in water, the 3d compressive strength in water can reach more than 0.5MPa, the final setting time is less than 15h, and the light slurry is particularly suitable for filling building gaps between duct pieces and surrounding rocks in tunnel synchronous shield tunneling construction and can better ensure the engineering quality;
3) the raw materials are easy to obtain, and the cost is saved.
The present invention can be modified and adapted appropriately from the above-described embodiments, according to the principles described above. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (12)
1. The light slurry for shield synchronous grouting is characterized by comprising, by weight, 200-300 parts of cement, 50-160 parts of light aggregate, 600-800 parts of fly ash, 1.0-1.6 parts of a water reducing agent, 10-16 parts of a flocculating agent, 15-25 parts of a coagulation regulator and 600-750 parts of water.
2. The lightweight slurry for shield grouting according to claim 1, wherein the cement is portland cement.
3. The lightweight slurry for shield grouting according to claim 1, wherein the cement is one or more of 42.5-grade ordinary portland cement, 42.5R-grade portland cement, 52.5R-grade portland cement, and 32.5-grade portland cement.
4. The lightweight slurry for shield grouting according to claim 1, wherein the lightweight aggregate is expanded perlite particles.
5. The lightweight slurry for shield grouting according to claim 1, wherein the lightweight aggregate true density is less than 0.60.
6. The lightweight slurry for shield grouting according to claim 1, wherein the lightweight aggregate has a particle size of 20 to 120 meshes.
7. The lightweight slurry for shield grouting according to claim 1, wherein the fly ash is primary fly ash or secondary fly ash.
8. The light slurry for shield grouting according to claim 1, characterized in that the water reducer is a polycarboxylate powder water reducer.
9. The light slurry for shield grouting according to claim 1, characterized in that the flocculant is a polysaccharide flocculant.
10. The light slurry for shield grouting according to claim 9, wherein the flocculant contains 40-60% of polysaccharide.
11. The light slurry for shield grouting according to claim 9, wherein the flocculant is a UWB-II type high anti-dispersion polysaccharide flocculant.
12. The light slurry for shield grouting according to claim 1, wherein the setting regulator is one or more selected from triethanolamine, calcium formate and calcium chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010173814.0A CN111470817A (en) | 2020-03-12 | 2020-03-12 | Light slurry for shield synchronous grouting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010173814.0A CN111470817A (en) | 2020-03-12 | 2020-03-12 | Light slurry for shield synchronous grouting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111470817A true CN111470817A (en) | 2020-07-31 |
Family
ID=71748267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010173814.0A Pending CN111470817A (en) | 2020-03-12 | 2020-03-12 | Light slurry for shield synchronous grouting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111470817A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112110687A (en) * | 2020-09-12 | 2020-12-22 | 六枝特区华兴管业制品有限公司 | Gas plugging agent made of inorganic material and preparation and use methods thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632288A (en) * | 2004-12-29 | 2005-06-29 | 上海隧道工程股份有限公司 | Method of vulcanized slurry synchronous slip casting for subway shield |
| CN103951335A (en) * | 2013-12-13 | 2014-07-30 | 中铁十四局集团有限公司 | Synchronous grouting method for recycling large-diameter waste slurry generated during slurry shield |
| CN106946522A (en) * | 2017-03-08 | 2017-07-14 | 北京艺高世纪科技股份有限公司 | A kind of shield synchronization slip casting construction material |
| CN109369122A (en) * | 2018-12-05 | 2019-02-22 | 中广核工程有限公司 | Shield grouting lightweight slurries |
-
2020
- 2020-03-12 CN CN202010173814.0A patent/CN111470817A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632288A (en) * | 2004-12-29 | 2005-06-29 | 上海隧道工程股份有限公司 | Method of vulcanized slurry synchronous slip casting for subway shield |
| CN103951335A (en) * | 2013-12-13 | 2014-07-30 | 中铁十四局集团有限公司 | Synchronous grouting method for recycling large-diameter waste slurry generated during slurry shield |
| CN106946522A (en) * | 2017-03-08 | 2017-07-14 | 北京艺高世纪科技股份有限公司 | A kind of shield synchronization slip casting construction material |
| CN109369122A (en) * | 2018-12-05 | 2019-02-22 | 中广核工程有限公司 | Shield grouting lightweight slurries |
Non-Patent Citations (2)
| Title |
|---|
| 于树春: "《煤层底板含水层大面积注浆改造技术》", 31 July 2014, 煤炭工业出版社 * |
| 张巨松等: "《混凝土原材料》", 31 January 2019, 哈尔滨工业大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112110687A (en) * | 2020-09-12 | 2020-12-22 | 六枝特区华兴管业制品有限公司 | Gas plugging agent made of inorganic material and preparation and use methods thereof |
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Application publication date: 20200731 |