CN109439303B - Inert filling material for shield sharp turning and preparation method thereof - Google Patents
Inert filling material for shield sharp turning and preparation method thereof Download PDFInfo
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
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Abstract
The invention relates to an inert filling material for shield sharp turning and a preparation method thereof, wherein the material is a double-liquid injection type filling material, and liquid A comprises the following components: 20-30% of bentonite, 10-15% of inorganic powder and a water-retaining agent: 0.2-0.5 percent of antifreeze, and the balance of water; the liquid B is a superplasticizer. The bentonite is sodium bentonite with high expansion rate; the inorganic powder is a mixture of talcum powder and calcium carbonate in a mass ratio of 1:1-1: 3. The inert filling material for sharp turning of the shield is a never-solidified paste filling material, and the material cannot quickly run off from a filling hole to the front shield and the shield tail due to high adhesiveness, so that the backward inflow of soil and slurry on the excavation surface can be blocked. The shield tunneling machine can quickly fill the shield tunneling clearance and provide support for shield turning. The shield shell has certain dilution resistance, and can be isolated from direct contact with underground water, so that the corrosion resistance of the shield shell is improved. The inert filling material for shield sharp turning is green, environment-friendly and pollution-free, can still work at negative temperature, and provides guarantee for shield continuous sharp turning.
Description
Technical Field
The invention relates to the field of shield construction materials, in particular to an inert filling material for shield sharp turning and a preparation method thereof.
Background
The shield method is widely applied to urban subway tunnel construction as a quick and safe construction method, and because underground buildings, structures, pipelines and the like are complicated, the shield sometimes needs to avoid the facilities in the tunneling process, and needs to carry out sharp curve construction, so that the construction difficulty and risk are extremely high. The shield constructs the machine because turning radius is less when the sharp curve construction, and the angle of turning is great at every turn, leads to the shield to construct to surpass to dig seriously, and the clearance between shield shell and the soil body is wideer, needs to add an inertia filler material in time to fill and surpasses to dig the clearance, stabilizes the direction of turning, and the adjustment of being convenient for constructs the gesture, guarantees that the shield constructs the machine and can turn in succession. If the gap between the shield shell and the soil body cannot be filled in the process of sharp turning of the shield, the following problems can occur: firstly, the stability of an excavation surface is affected due to overlarge clearance between a shield shell and a stratum caused by overexcitation, and unstable collapse is easy to occur on the excavation surface due to backward inflow of slurry of the excavation surface; secondly, the soil around the shield shell is inwardly converged to generate large deformation, and the shield machine is easy to block in sharp turning; the turning angle of the shield tunneling machine is difficult to control, and the phenomenon that the turning angle is too large at one time easily occurs, so that the subsequent duct piece is difficult to assemble; and fourthly, the friction resistance between the shield body and the stratum is large in the turning process of the shield tunneling machine, and large steering thrust is needed, so that the shield shell is seriously abraded. If the gap caused by excessive overexcavation is not filled in time, soil above the shield loosens to cause larger surface subsidence.
In the existing shield turning technology, turning construction is generally carried out in a mode of small angle, multiple turning and low-speed tunneling, the method is suitable for large-radius turning of the shield and cannot be completely used for shield sharp turning construction, and shield over-excavation gap filling is an engineering problem which needs to be solved for shield sharp turning construction.
Patent CN103244132A discloses a construction method for a shield tunneling machine to pass through a house in sandy soil, in the process of tunneling by the shield tunneling machine, a grouting system is continuously used to synchronously inject synchronous grout (the synchronous grout comprises lime powder, coal ash sand, bentonite, water and a water reducing agent) into a channel wall, and after the shield tunneling machine constructs and lays part of segments, second grout filling is performed on the channel wall on the outer side of the constructed segment. The special synchronous slurry is injected into the excavated channel wall during tunneling, so that the sedimentation during the propelling process and the later construction period can be effectively controlled after the slurry is solidified, in addition, the sedimentation problem after construction is further prevented through secondary slurry supplement during construction, and good protection is provided for the tunneled tunnel. The technical problem of how to effectively control the sedimentation phenomenon in sandy soil is solved. But the synchronous grouting is carried out on the shield tail part and fills the shield tail gap between the pipe piece and the stratum. The synchronous grouting slurry needs 5-12 hours to solidify, has high strength and belongs to filling mortar.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to provide an inert filling material for shield sharp turning and a preparation method and application thereof. The inert filling material for sharp turning of the shield is a double-liquid injection type material, and cannot be hardened and solidified along with time, so that the shield machine is prevented from being locked after the material is hardened. The inert filling material for sharp turning of the shield has certain viscosity, subsidence resistance and dilution resistance, so that the material cannot run off to the anterior shield and the shield tail from the injection hole rapidly, the gap of over digging of the shield can be filled, the shield turning is supported, the underground water can be prevented from being washed and diluted, the shield shell is isolated from being in direct contact with the underground water, and the corrosion resistance of the shield shell is improved. The inert filling material for shield sharp turning is green, environment-friendly and pollution-free, can still work at negative temperature, and provides guarantee for shield continuous sharp turning.
In order to achieve the purpose, the invention adopts the following technical scheme:
the inert filling material for the sharp turn of the shield is a double-liquid injection type material, wherein liquid A comprises the following raw materials in percentage by weight: 20-30% of bentonite, 10-15% of inorganic powder and a water-retaining agent: 0.2-0.5 percent of antifreeze, and the balance of water; the liquid B is a superplasticizer;
the volume ratio of the liquid A to the liquid B is 1: 0.5-0.8.
In the existing shield machine, a shield body gap between a shield shell and a stratum is small in the tunneling process, and the shield body gap is not generally processed. However, the shield is subjected to larger overbreak when turning, the material needs to be filled to prevent soil blocks and stones from collapsing, and the gap can be filled with the material, so that the shield has a filling effect and an anti-sinking effect. For this reason, the present application reacts bentonite with a superplasticizer to produce a plasticized material with a certain viscosity, which does not solidify over time like a synchronous grouting slurry, but is a soft material that can fill the gap between the shield and the formation and does not solidify. Meanwhile, other additives are used for assistance, so that the filling property and the subsidence resistance of the inert filling material are more suitable for sharp turning of the shield machine, and the precision requirement of the sharp turning of the shield machine can be met.
In some embodiments, liquid a consists of: 25-30% of bentonite, 12-15% of inorganic powder, and a water-retaining agent: 0.2-0.5 percent of antifreeze, and the balance of water; the liquid B is a superplasticizer.
The volume ratio of the liquid A to the liquid B is 1: 0.5-0.6.
The inert filling material is filled in a gap between a shield shell of a shield machine in front of a shield tail and a stratum, the gap is smaller than a gap of the shield tail, the filling is not generally carried out, but the filling is carried out at present in order to ensure the precision when the shield tail is sharply turned. But is different from the common shield tail filling high-strength quick-setting mortar; the inert filling material adopted by the application can not be solidified, is a soft material, has very low strength, and has filling effect and anti-sinking capability. The inert material is filled in front of the shield tail, and the slurry is filled behind the shield tail. The difference of the two action positions is shown in figure 1.
In some embodiments, liquid a consists of: 20-25% of bentonite, 10-12% of inorganic powder and water-retaining agent: 0.2-0.5 percent of antifreeze, and the balance of water; the liquid B is a superplasticizer;
the volume ratio of the liquid A to the liquid B is 1: 0.6-0.8.
In some embodiments, the inorganic powder consists of talcum powder and calcium carbonate, wherein the mass ratio of the talcum powder to the calcium carbonate is 1: 1-3.
In some embodiments, the bentonite is a sodium bentonite having a high multiple expansion.
In some embodiments, the water retaining agent is one or a mixture of polyacrylamide, sodium polyacrylate, ammonium polyacrylate or hydroxypropyl methylcellulose.
In some embodiments, the antifreezing agent is nitrite type green composite antifreezing agent commonly used in engineering, the composite antifreezing agent does not contain chlorine salt, is pollution-free, does not corrode a shield shell of a shield machine, does not pollute the underground environment, and has good antifreezing effect.
In some embodiments, the superplasticizer is a water glass solution and has a Baume degree of 27-50.
The invention also provides a preparation method of the inert filling material for shield sharp turning, which comprises the following steps:
uniformly mixing bentonite and water, and then adding mixed powder of talcum powder and calcium carbonate; after mixing evenly, adding the water-retaining agent and the antifreezing agent in sequence, and mixing evenly to prepare solution A;
when the inert filling material is used, the solution A and the solution B are mixed and quickly react to obtain the inert filling material for shield sharp turning.
The invention also provides application of any inert filling material for sharp turning of the shield in filling of the shield over-excavation gap.
The invention has the advantages of
(1) The inert filling material for sharp turning of the shield can quickly fill the shield over-excavation gap, and the material has certain adhesiveness, so that the soil body or slurry on the excavation surface can be effectively prevented from flowing backwards, and the stability of the excavation surface is maintained.
(2) The inert filling material for sharp turning of the shield has good filling performance and sinking resistance, prevents the soil body from being deformed greatly in the sharp turning process of the shield, ensures that turning is carried out continuously, can prevent the shield machine from being blocked by the soil body with large deformation, and can control the stratum settlement caused by soil body disturbance to a certain extent.
(3) This shield constructs inertia filler material for sharp turn can enough fill and turn curved line outside space, also can fill the curved line inboard of turning, in case once turn the angle too big, the accessible is annotated this material to the curve inboard and is carried out the angle adjustment back, more is favorable to the shield to construct sharp turn angle control, compensaties construction error, guarantees that follow-up section of jurisdiction is assembled and goes on smoothly.
(4) The inert filling material for sharp turning of the shield has a certain lubricating effect, reduces the frictional resistance between the shield machine and the stratum, and protects the service life of the shield shell.
(5) The inert filling material for sharp turning of the shield can be used at negative temperature, has outstanding anti-scattering capability, is not influenced by ambient temperature and underground water, and is more favorable for the shield to be constructed in complex environment.
(6) The preparation method is simple, high in filling efficiency, strong in practicability and easy to popularize.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic filling diagram of the present application.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced by the background art, the existing shield turning technology cannot be completely used for shield sharp turning construction, and shield over-excavation gap filling is an engineering problem which must be solved for shield sharp turning construction. Therefore, the invention provides an inert filling material for shield sharp turning and a preparation method and application thereof.
An inert filling material for shield sharp turning is disclosed, wherein liquid A comprises the following components: 20-30% of bentonite, 10-15% of inorganic powder and a water-retaining agent: 0.2-0.5 percent of antifreeze, and the balance of water; the liquid B is a superplasticizer.
The volume ratio of the liquid A to the liquid B is 1: 0.5-0.8.
The bentonite is sodium bentonite;
the expansion multiple of the sodium bentonite is 20-30 times, which is far higher than that of common calcium bentonite by several times, and the higher volume expansion property determines the filling performance of the material, thereby ensuring the rapid filling requirement during shield sharp turning construction.
The pH value of the sodium bentonite is 8.5-10.6, which is higher than that of the common calcium bentonite 6.4-8, the mixed solution is alkalescent, and the shield shell cannot be corroded in the using process.
The inorganic powder is a mixture of talcum powder and calcium carbonate, wherein the talcum powder and the calcium carbonate are most commonly used and have higher content, and mainly play roles in lubrication and filling, and the pumping performance of the liquid A in the conveying process can be improved by increasing the mixing amount of the talcum powder.
The water-retaining agent is one or a mixture of polyacrylamide, sodium polyacrylate, ammonium polyacrylate, hydroxypropyl methyl cellulose and the like, has high water absorption rate, high water absorption speed and excellent water retention performance, can improve the viscosity of mixed liquid, achieves the effects of water retention and thickening, and further plays a role in resisting water dispersion.
The antifreezing agent is added into the inert filling material, so that the material can work at negative temperature, underground water is prevented from freezing at low temperature, the low-temperature storage performance of the liquid A is improved, and the low-temperature pumping is not influenced.
The superplasticizer is a water glass solution, and is mixed with the solution A to quickly generate a chemical reaction to generate a paste with high viscosity and never solidification, namely the inert filling material for the shield sharp turn.
Preferably, the inert filling material for sharp turns of the shield is characterized in that the solution A consists of the following components: 25-30% of bentonite, 12-15% of inorganic powder, and a water-retaining agent: 0.3-0.5% of antifreezing agent, 0.5-0.8% of antifreezing agent and the balance of water; the liquid B is a superplasticizer.
Preferably, the mass ratio of the talcum powder to the calcium carbonate in the inorganic powder is 1:1, 1:1.5, 1:2, 1:2.5 or 1: 3.
The volume ratio of the liquid A to the liquid B is 1: 0.5-0.6.
Preferably, the shield high-performance synchronous grouting modifier comprises the following components in part by weight: 30% of bentonite, 13% of inorganic powder and a water-retaining agent: 0.5 percent of antifreezing agent, 0.6 percent of antifreezing agent and the balance of water; the liquid B is a superplasticizer.
Preferably, the mass ratio of the talcum powder to the calcium carbonate in the inorganic powder is 1:2.
The volume ratio of the liquid A to the liquid B is 1: 0.6.
Preferably, the antifreezing agent is a paste antifreezing agent compounded by water reducing and various antifreezing components, and has the advantages of good antifreezing, air entraining and water retaining properties. The antifreeze in the invention adopts the antifreeze suitable for the temperature of-15 ℃ to 0 ℃, has no quick setting phenomenon, and can store and use the inert filling material A liquid at the negative temperature.
The preparation method of the inert filling material for the sharp turning of the shield comprises the following steps:
1) mixing bentonite and water, and stirring while mixing until the bentonite and the water are uniformly stirred;
2) mixing talcum powder and calcium carbonate uniformly, adding the mixture in the step 1), and stirring until the powder is completely dissolved;
3) adding the water-retaining agent and the antifreezing agent into the mixed solution in the step 2) in sequence, and stirring uniformly to prepare a solution A;
4) when in use, the solution A and the solution B are mixed to obtain the inert filling material for shield sharp turning.
When the shield shell injection hole is used on site, the liquid A and the liquid B are respectively stored in two storage tanks and are pumped to the shield shell injection hole by different pumping pipelines, the A, B liquid is mixed and injected into the shield shell injection hole to form the shield sharp-turning over-digging gap, and the pipeline is timely cleaned after pumping is finished, so that pumping is convenient for the next time.
The invention is further described with reference to the accompanying drawings and the detailed description.
In the following examples, the antifreeze used was sodium nitrite antifreeze available from chemical Limited, Denwann, Jinan.
The adopted superplasticizer is a water glass solution, and the Baume degree is 33-35.
Example 1
The inert filling material for shield sharp turning is characterized in that the liquid A comprises the following components: 25% of bentonite, 12% of inorganic powder and a water-retaining agent: 0.2 percent of antifreezing agent, 0.5 percent of water, 62.3 percent of water; the liquid B is a superplasticizer.
The volume ratio of the liquid A to the liquid B is 1: 0.5;
the bentonite is sodium bentonite;
the mass ratio of the talcum powder to the calcium carbonate in the inorganic powder is 1: 1;
the water-retaining agent is polyacrylamide;
mixing bentonite and water, and stirring while mixing until the mixture is uniformly stirred. And then, uniformly mixing the talcum powder and the calcium carbonate, adding the mixture into the mixed solution, and stirring until the powder is completely dissolved. Adding water-retaining agent and antifreezing agent in turn, and stirring to obtain solution A. When in use, the liquid A and the liquid B are mixed according to the proportion of 1: mixing the two by 0.5 volume, and reacting the two quickly to obtain the inert filling material for the shield sharp turn.
Example 2
The inert filling material for shield sharp turning is characterized in that the liquid A comprises the following components: 30% of bentonite, 12% of inorganic powder and a water-retaining agent: 0.2 percent of antifreezing agent, 0.5 percent of water and 57.3 percent of water; the liquid B is a superplasticizer.
The volume ratio of the liquid A to the liquid B is 1: 0.5;
the bentonite is sodium bentonite;
the mass ratio of the talcum powder to the calcium carbonate in the inorganic powder is 1: 1;
the water-retaining agent is polyacrylamide;
mixing bentonite and water, and stirring while mixing until the mixture is uniformly stirred. And then, uniformly mixing the talcum powder and the calcium carbonate, adding the mixture into the mixed solution, and stirring until the powder is completely dissolved. Adding water-retaining agent and antifreezing agent in turn, and stirring to obtain solution A. When in use, the liquid A and the liquid B are mixed according to the proportion of 1: mixing the two by 0.5 volume, and reacting the two quickly to obtain the inert filling material for the shield sharp turn.
Example 3
The inert filling material for shield sharp turning is characterized in that the liquid A comprises the following components: 30% of bentonite, 15% of inorganic powder and a water-retaining agent: 0.2 percent of antifreezing agent, 0.5 percent of water and 54.3 percent of water; the liquid B is a superplasticizer.
The volume ratio of the liquid A to the liquid B is 1: 0.5;
the bentonite is sodium bentonite;
the mass ratio of the talcum powder to the calcium carbonate in the inorganic powder is 1: 1;
the water-retaining agent is polyacrylamide;
mixing bentonite and water, and stirring while mixing until the mixture is uniformly stirred. And then, uniformly mixing the talcum powder and the calcium carbonate, adding the mixture into the mixed solution, and stirring until the powder is completely dissolved. Adding water-retaining agent and antifreezing agent in turn, and stirring to obtain solution A. When in use, the liquid A and the liquid B are mixed according to the proportion of 1: mixing the two by 0.5 volume, and reacting the two quickly to obtain the inert filling material for the shield sharp turn.
Example 4
The inert filling material for shield sharp turning is characterized in that the liquid A comprises the following components: 30% of bentonite, 15% of inorganic powder and a water-retaining agent: 0.3 percent of antifreezing agent, 0.5 percent of water and 54.2 percent of water; the liquid B is a superplasticizer.
The volume ratio of the liquid A to the liquid B is 1: 0.6;
the bentonite is sodium bentonite;
the mass ratio of the talcum powder to the calcium carbonate in the inorganic powder is 1: 1;
the water-retaining agent is polyacrylamide;
mixing bentonite and water, and stirring while mixing until the mixture is uniformly stirred. And then, uniformly mixing the talcum powder and the calcium carbonate, adding the mixture into the mixed solution, and stirring until the powder is completely dissolved. Adding water-retaining agent and antifreezing agent in turn, and stirring to obtain solution A. When in use, the liquid A and the liquid B are mixed according to the proportion of 1: and mixing the two components in the volume of 0.6, and reacting the two components quickly to obtain the inert filling material for the shield sharp turn.
Example 5
The inert filling material for shield sharp turning is characterized in that the liquid A comprises the following components: 30% of bentonite, 15% of inorganic powder and a water-retaining agent: 0.4 percent of antifreeze and 54.1 percent of water; the liquid B is a superplasticizer.
The volume ratio of the liquid A to the liquid B is 1: 0.6;
the bentonite is sodium bentonite;
the mass ratio of the talcum powder to the calcium carbonate in the inorganic powder is 1: 1;
the water-retaining agent is polyacrylamide;
mixing bentonite and water, and stirring while mixing until the mixture is uniformly stirred. And then, uniformly mixing the talcum powder and the calcium carbonate, adding the mixture into the mixed solution, and stirring until the powder is completely dissolved. Adding water-retaining agent and antifreezing agent in turn, and stirring to obtain solution A. When in use, the liquid A and the liquid B are mixed according to the proportion of 1: and mixing the two components in the volume of 0.6, and reacting the two components quickly to obtain the inert filling material for the shield sharp turn.
Example 6
The inert filling material for shield sharp turning is characterized in that the liquid A comprises the following components: 30% of bentonite, 15% of inorganic powder and a water-retaining agent: 0.4 percent of antifreeze and 54.1 percent of water; the liquid B is a superplasticizer.
The volume ratio of the liquid A to the liquid B is 1: 0.6;
the bentonite is sodium bentonite;
the mass ratio of the talcum powder to the calcium carbonate in the inorganic powder is 1: 2;
the water-retaining agent is polyacrylamide
Mixing bentonite and water, and stirring while mixing until the mixture is uniformly stirred. And then, uniformly mixing the talcum powder and the calcium carbonate, adding the mixture into the mixed solution, and stirring until the powder is completely dissolved. Adding water-retaining agent and antifreezing agent in turn, and stirring to obtain solution A. When in use, the liquid A and the liquid B are mixed according to the proportion of 1: and mixing the two components in the volume of 0.6, and reacting the two components quickly to obtain the inert filling material for the shield sharp turn.
Example 7
The inert filling material for shield sharp turning is characterized in that the liquid A comprises the following components: 30% of bentonite, 15% of inorganic powder and a water-retaining agent: 0.5 percent of antifreezing agent, 0.5 percent of water and 54.0 percent of water; the liquid B is a superplasticizer.
The volume ratio of the liquid A to the liquid B is 1: 0.8;
the bentonite is sodium bentonite;
the mass ratio of the talcum powder to the calcium carbonate in the inorganic powder is 1: 2;
the water-retaining agent is polyacrylamide;
mixing bentonite and water, and stirring while mixing until the mixture is uniformly stirred. And then, uniformly mixing the talcum powder and the calcium carbonate, adding the mixture into the mixed solution, and stirring until the powder is completely dissolved. Adding water-retaining agent and antifreezing agent in turn, and stirring to obtain solution A. When in use, the liquid A and the liquid B are mixed according to the proportion of 1: mixing the two solutions by the volume of 0.8, and reacting the two solutions quickly to obtain the inert filling material for the shield sharp turn.
The viscosity of the material in each example was measured using a rotational viscometer and the water retention properties were observed, and the freezing of liquid A was observed at low temperature and the reaction time for each example was recorded, the specific properties being shown in Table 1.
TABLE 1
From this, it is understood that the reaction of the solution A and the solution B of the present application can be completed within 15 seconds.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (5)
1. The inert filling material for sharp turning of the shield is characterized in that: the filling material is a double-liquid injection type material, and the double liquid comprises a liquid A and a liquid B, wherein the liquid A is composed of the following raw materials in percentage by weight: 20-30% of sodium bentonite, 10-15% of inorganic powder and water-retaining agent: 0.2-0.5 percent of antifreeze, and the balance of water; the liquid B is a superplasticizer;
the volume ratio of the liquid A to the liquid B is 1: 0.5-0.8;
the inorganic powder consists of talcum powder and calcium carbonate, wherein the mass ratio of the talcum powder to the calcium carbonate is 1: 1-3;
the water-retaining agent is one or more of polyacrylamide, sodium polyacrylate, ammonium polyacrylate or hydroxypropyl methyl cellulose;
the antifreezing agent is a nitrite type green composite antifreezing agent;
the superplasticizer is a water glass solution.
2. The inert filler material for shield sharp turns according to claim 1, wherein the solution A consists of the following components: 25-30% of sodium bentonite, 12-15% of inorganic powder, and water-retaining agent: 0.2-0.5 percent of antifreeze, and the balance of water; the liquid B is a superplasticizer;
the volume ratio of the liquid A to the liquid B is 1: 0.5-0.6.
3. The inert filler material for shield sharp turns of claim 1, wherein: the solution A consists of the following components: 20-25% of sodium bentonite, 10-12% of inorganic powder, and water-retaining agent: 0.2-0.5 percent of antifreeze, and the balance of water; the liquid B is a superplasticizer;
the volume ratio of the liquid A to the liquid B is 1: 0.6-0.8.
4. The method for preparing the inert filling material for the sharp turn of the shield according to any one of claims 1 to 3, which is characterized in that: the method comprises the following steps:
mixing sodium bentonite and water uniformly, and adding mixed powder of talcum powder and calcium carbonate; after mixing evenly, adding the water-retaining agent and the antifreezing agent in sequence, and mixing evenly to prepare solution A;
when the inert filling material is used, the solution A and the solution B are mixed in proportion and quickly react to obtain the inert filling material for shield sharp turning.
5. Use of the inert filler material for shield sharp turns according to any one of claims 1 to 3 for filling the shield overbreak gap.
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| CN112065416B (en) * | 2020-10-24 | 2023-08-22 | 中铁一局集团有限公司 | Construction method for vertical deviation correction of shield tunneling |
| CN114477824B (en) * | 2022-02-15 | 2022-10-28 | 福建中天交通工程技术服务有限公司 | Preparation method of modified clay effect |
| CN114477946B (en) * | 2022-04-19 | 2022-09-09 | 天津大学 | Filling and sinking control material for shield construction |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5645375A (en) * | 1995-06-07 | 1997-07-08 | Stephens; Patrick J. | Method and apparatus for grouting of tunnel liners |
| CN106593451A (en) * | 2016-12-22 | 2017-04-26 | 上海三瑞高分子材料股份有限公司 | Clay shock material for controlling settlement of shield-tunneled soil body |
| CN107459324A (en) * | 2017-08-11 | 2017-12-12 | 山东大学 | A kind of shield anti-stratum settlement housing packing material and preparation method thereof |
-
2018
- 2018-11-23 CN CN201811407667.8A patent/CN109439303B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5645375A (en) * | 1995-06-07 | 1997-07-08 | Stephens; Patrick J. | Method and apparatus for grouting of tunnel liners |
| CN106593451A (en) * | 2016-12-22 | 2017-04-26 | 上海三瑞高分子材料股份有限公司 | Clay shock material for controlling settlement of shield-tunneled soil body |
| CN107459324A (en) * | 2017-08-11 | 2017-12-12 | 山东大学 | A kind of shield anti-stratum settlement housing packing material and preparation method thereof |
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| CN109439303A (en) | 2019-03-08 |
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