CN109574554B - Slurry suitable for underground diaphragm wall construction - Google Patents
Slurry suitable for underground diaphragm wall construction Download PDFInfo
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- CN109574554B CN109574554B CN201811420207.9A CN201811420207A CN109574554B CN 109574554 B CN109574554 B CN 109574554B CN 201811420207 A CN201811420207 A CN 201811420207A CN 109574554 B CN109574554 B CN 109574554B
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/28—Polysaccharides or derivatives thereof
- C04B26/285—Cellulose or derivatives thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses slurry suitable for underground diaphragm wall construction, which comprises the following raw materials in parts by weight: 9 to 11 percent of sodium bentonite, 2 to 5 percent of sodium carbonate, 0.01 to 0.04 percent of sodium carboxymethyl cellulose, and the balance of water. The invention has the advantages of low cost and good mud wall protection effect.
Description
Technical Field
The invention relates to the technical field of engineering construction, in particular to slurry suitable for underground diaphragm wall construction.
Background
A narrow and deep foundation trench is dug underground by using a trenching machine and under the action of a slurry retaining wall, and concrete is poured in the foundation trench to form a continuous wall body with the functions of seepage prevention, soil retaining, bearing and floating resistance, which is called as an underground continuous wall.
The underground diaphragm wall has the characteristics of small vibration, low noise, high wall rigidity, high construction speed, high economic benefit and the like during construction, so that the underground diaphragm wall is widely applied to the engineering construction fields of subways, municipal works, water conservancy and hydropower, high-speed rails and the like.
The content of sodium carboxymethylcellulose (CMC) required in the common slurry proportion is large, and the preparation cost of the slurry is relatively high. When the underground continuous wall is constructed in a soft soil layer, the common slurry is difficult to play a wall protection role, and the wall of the groove is very easy to collapse in the groove forming process. The concrete amount is over consumed due to pouring after hole collapse, the engineering cost is greatly increased, and the integral stability of the underground continuous wall is seriously influenced. When the hole collapse is serious, the pavement around the wall body collapses, and structures and large equipment close to the wall body topple over along with the pavement, so that engineering safety quality accidents are finally caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the slurry which has low cost, good slurry wall protection effect and enhanced stability of the wall of the tank and is suitable for the construction of the underground continuous wall.
In order to solve the technical problems, the invention adopts the following technical scheme:
the mud suitable for the construction of the underground diaphragm wall is prepared from the following raw materials in parts by weight: 9 to 11 percent of sodium bentonite, 2 to 5 percent of sodium carbonate, 0.01 to 0.04 percent of sodium carboxymethyl cellulose, and the balance of water.
As a further improvement to the above technical solution:
the sodium bentonite comprises montmorillonite, wherein the content of montmorillonite in the sodium bentonite is M, and M is more than or equal to 50%.
80％≥M≥50％。
Na in the sodium carbonate2CO3The content is not less than 99%.
The acid-viscosity ratio of the sodium carboxymethylcellulose is more than or equal to 0.8, and the salt-viscosity ratio is more than or equal to 1.0.
Compared with the prior art, the invention has the advantages that:
the slurry suitable for the construction of the underground continuous wall, disclosed by the invention, has the advantages that the specific gravity, the consistency and the sand content of the slurry meet the design specifications, and meanwhile, the low-content sodium carboxymethylcellulose is adopted, so that the preparation cost of the slurry is reduced, the slurry has a good wall protection effect when the underground continuous wall is constructed, the probability of collapse of the wall of the underground continuous wall is reduced, the integral stability of the underground continuous wall is ensured, and the slurry is particularly suitable for the construction of the underground continuous wall in the weak soil layers such as the fourth-system alluvial sand clay, silty clay, miscellaneous filling soil, silt, fine sand and the like.
Detailed Description
The present invention will be described in further detail with reference to specific examples. Unless otherwise specified, the following materials and instruments are commercially available.
The invention relates to slurry suitable for underground diaphragm wall construction, which comprises the following preparation raw materials in parts by weight: 9 to 11 percent of sodium bentonite, 2 to 5 percent of sodium carbonate, 0.01 to 0.04 percent of sodium carboxymethyl cellulose, and the balance of water.
The slurry suitable for the construction of the underground continuous wall, disclosed by the invention, has the advantages that the specific gravity, the consistency and the sand content of the slurry meet the design specifications, and meanwhile, the low-content sodium carboxymethylcellulose is adopted, so that the preparation cost of the slurry is reduced, the slurry has a good wall protection effect when the underground continuous wall is constructed, the probability of collapse of the wall of the underground continuous wall is reduced, the integral stability of the underground continuous wall is ensured, and the slurry is particularly suitable for the construction of the underground continuous wall in the weak soil layers such as the fourth-system alluvial sand clay, silty clay, miscellaneous filling soil, silt, fine sand and the like.
The sodium bentonite comprises montmorillonite, and the content of montmorillonite in the sodium bentonite is M, wherein M is more than or equal to 50%.
80% or more than M is more than or equal to 50%. When the content of montmorillonite in the sodium bentonite is between 50 and 80 percent, the slurry is not easy to collapse holes, and the wall protection effect is better.
Na in soda ash2CO3The content is not less than 99%.
The acid-viscosity ratio of the sodium carboxymethylcellulose is more than or equal to 0.8, and the salt-viscosity ratio is more than or equal to 1.0. When the acid-to-viscosity ratio of the sodium carboxymethylcellulose is 0.8-0.85, the slurry is not easy to collapse, and the wall protection effect is better.
Example 1
The mud suitable for the underground continuous wall construction of the embodiment is prepared from the following raw materials in parts by weight: water: 90.60%, sodium bentonite: 9.13%, soda: 0.24%, sodium carboxymethylcellulose (CMC): 0.03 percent.
In this example, the content of montmorillonite in sodium bentonite was 50%, and the content of Na in soda ash was Na2CO3The content is 99 percent, the acid-viscosity ratio of the sodium carboxymethyl cellulose is 0.8, and the salt-viscosity ratio is 1.0.
Example 2
The mud suitable for the underground continuous wall construction of the embodiment is prepared from the following raw materials in parts by weight: water: 89.73%, sodium bentonite: 9.87%, soda: 0.38%, sodium carboxymethylcellulose (CMC): 0.02 percent.
In this example, the content of montmorillonite in sodium bentonite was 60%, and the content of Na in soda ash was Na2CO3The content is 99 percent, the acid-viscosity ratio of the sodium carboxymethyl cellulose is 0.9, and the salt-viscosity ratio is 1.0.
Example 3
The mud suitable for the underground continuous wall construction of the embodiment is prepared from the following raw materials in parts by weight: water: 89.98%, sodium bentonite: 9.63%, soda: 0.35%, sodium carboxymethylcellulose (CMC): 0.04 percent.
In this example, the content of montmorillonite in sodium bentonite was 80%, and the content of Na in soda ash was Na2CO399 percent of the content, the acid-viscosity ratio of the sodium carboxymethyl cellulose is 0.85, and the salt-viscosity ratio is 1.0.
Comparative example 1
A slurry of this comparative example was prepared from the following raw materials by weight: water: 87.9%, sodium bentonite: 11.4%, soda: 0.52%, sodium carboxymethylcellulose (CMC): 0.08 percent.
In this comparative example, the content of montmorillonite in sodium bentonite was 45%, and Na in soda ash was2CO3The content is 98 percent, the acid-viscosity ratio of the sodium carboxymethyl cellulose is 0.75, and the salt-viscosity ratio is 1.0.
Comparative example 2
A slurry of this comparative example was prepared from the following raw materials by weight: water: 91.56%, sodium bentonite: 8.23%, soda ash: 0.18%, sodium carboxymethylcellulose (CMC): 0.03 percent.
In this comparative example, the content of montmorillonite in sodium bentonite was 55%, and Na in soda ash was2CO3The content is 99 percent, the acid-viscosity ratio of the sodium carboxymethyl cellulose is 0.8, and the salt-viscosity ratio is 1.0.
Comparative example 3
A slurry of this comparative example was prepared from the following raw materials by weight: water: 88.71%, sodium bentonite: 10.62%, soda: 0.44%, sodium carboxymethylcellulose (CMC): 0.23 percent.
In this comparative example, the smectite was in the sodium bentoniteThe content of Na in soda is 80 percent2CO399 percent of the content, the acid-viscosity ratio of the sodium carboxymethyl cellulose is 0.85, and the salt-viscosity ratio is 1.0.
The raw materials of examples 1 to 3 and comparative examples 1 to 3 were prepared and mixed for 30min in a slurry mixing tank filled with slurry and pumped to a slurry storage tank by a 150NSL-19 slurry pump. And pumping high-pressure air into the slurry storage pool by using an WLF7.5YT model air compressor to keep the fluidity of the slurry, and obtaining the target slurry after 24 hours. The slurry storage tank adopts a semi-buried brick-built slurry tank.
The slurries prepared in examples 1 to 3 and comparative examples 1 to 3 were subjected to the performance tests, and the results of the slurry performance tests are shown in the following table:
from the above table, it can be known that the cost required by the slurry in the embodiments 1 to 3 is low, but the prepared slurry has good quality and better wall protection effect, and the loss of concrete is reduced while the stability of the wall of the tank is ensured in the actual construction, the engineering construction cost is reduced, and the construction quality of the underground diaphragm wall is improved.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (4)
1. The utility model provides a mud suitable for underground continuous wall construction which characterized in that: the preparation raw materials comprise the following components in parts by weight: 9 to 11 percent of sodium bentonite, 2 to 5 percent of sodium carbonate, 0.01 to 0.04 percent of sodium carboxymethyl cellulose and the balance of water; the sodium bentonite comprises montmorillonite, wherein the content of montmorillonite in the sodium bentonite is M, and M is more than or equal to 50%.
2. The slurry of claim 1, wherein: 80% or more than M is more than or equal to 50%.
3. A slurry according to claim 1 or 2, wherein: na in the sodium carbonate2CO3The content is not less than 99%.
4. A slurry according to claim 1 or 2, wherein: the acid-viscosity ratio of the sodium carboxymethylcellulose is more than or equal to 0.8, and the salt-viscosity ratio is more than or equal to 1.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811420207.9A CN109574554B (en) | 2018-11-26 | 2018-11-26 | Slurry suitable for underground diaphragm wall construction |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811420207.9A CN109574554B (en) | 2018-11-26 | 2018-11-26 | Slurry suitable for underground diaphragm wall construction |
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| CN109574554A CN109574554A (en) | 2019-04-05 |
| CN109574554B true CN109574554B (en) | 2021-07-09 |
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| CN201811420207.9A Active CN109574554B (en) | 2018-11-26 | 2018-11-26 | Slurry suitable for underground diaphragm wall construction |
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| CN111763040A (en) * | 2020-05-28 | 2020-10-13 | 浙江土工岩土科技有限公司 | Slurry for underground diaphragm wall near river and sea |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797252A (en) * | 2012-09-13 | 2012-11-28 | 中铁十二局集团第七工程有限公司 | Construction method of underground continuous walls |
| CN103233459A (en) * | 2013-04-02 | 2013-08-07 | 北京航空航天大学 | Steel plate and concrete combined underground continuous wall and construction method thereof |
| CN105178288A (en) * | 2015-07-31 | 2015-12-23 | 中铁隧道集团有限公司 | Construction method of underground continuous wall below viaduct |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6722434B2 (en) * | 2002-05-31 | 2004-04-20 | Halliburton Energy Services, Inc. | Methods of generating gas in well treating fluids |
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- 2018-11-26 CN CN201811420207.9A patent/CN109574554B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797252A (en) * | 2012-09-13 | 2012-11-28 | 中铁十二局集团第七工程有限公司 | Construction method of underground continuous walls |
| CN103233459A (en) * | 2013-04-02 | 2013-08-07 | 北京航空航天大学 | Steel plate and concrete combined underground continuous wall and construction method thereof |
| CN105178288A (en) * | 2015-07-31 | 2015-12-23 | 中铁隧道集团有限公司 | Construction method of underground continuous wall below viaduct |
Non-Patent Citations (1)
| Title |
|---|
| 软土地区百米超深地下连续墙成槽泥浆试验研究及应用;李耀良;《施工技术》;20171231;第46卷;第51-54页 * |
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