CN103306688A - Construction method of synchronous grouting process for ground in-out shield-driven tunnel - Google Patents
Construction method of synchronous grouting process for ground in-out shield-driven tunnel Download PDFInfo
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- CN103306688A CN103306688A CN2013102710284A CN201310271028A CN103306688A CN 103306688 A CN103306688 A CN 103306688A CN 2013102710284 A CN2013102710284 A CN 2013102710284A CN 201310271028 A CN201310271028 A CN 201310271028A CN 103306688 A CN103306688 A CN 103306688A
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Abstract
The invention provides a construction method of a synchronous grouting process for a ground in-out shield-driven tunnel. The construction method comprises the following steps: 1, producing grout; 2, confirming synchronous grouting construction parameters according to working conditions, wherein the synchronous grouting construction parameters are injecting rate, proportional distribution of the upper part and the lower part, and grouting pressure control; 3, carrying out construction according to the synchronous grouting construction parameters. The construction method has the benefits that 1, in the aspect of performance index, a grout material can perform better flowing and filling performances than a conventional grout material; 2, in the aspect of performance index, the grout material has higher early strength than the conventional grout material; 3, the construction parameters are obtained according to different working conditions of a ground in-out shield-driven tunnel, so that construction quality can be controlled effectively.
Description
Technical field
The present invention relates to tunnel synchronous grouting technology, particularly, relate to ground discrepancy formula shield tunnel synchronous grouting technology job practices.
Background technology
Shield-tunneling construction worker method becomes the first-selection of city tunnel construction so that it is little to surrounding environment influence, forming quality is high, safe and reliable, advantage such as construction speed is fast, cost is low.And shield-tunneling construction synchronous grouting technology is requisite key auxiliary worker's method in the shield method, is the key of control surface settlement and tunnel stability.The synchronous grouting technology of shield tunnel is in shield driving, and the slurries that will possess certain service behaviour and intensity by grouting pump inject among the section of jurisdiction ring external series gap of shield tail, reach the effect of filling section of jurisdiction ring outer void.
4 slip castings of the general employing of shield synchronization slip casting, shield machine is equipped with 4 injected holes at shield tail housing position, but in the ground discrepancy formula shield tunnel work progress, the shield structure is started the stage by ground, the top injected hole is exposed to top, the face of land, can't carry out the synchronous grouting construction, therefore can only adopt the bottom injected hole, this just needs slurries must possess good mobile filling capacity, in conjunction with rational construction control parameter, guarantee slurries mobile distance behind the wall of section of jurisdiction under certain (less) grouting pressure condition, thereby make slurries intactly wrap the section of jurisdiction, form the topping of one deck densification; Based on the special operation condition condition of ground discrepancy formula shield method constructing tunnel, synchronous grouting technology is different from conventional shield synchronization slip casting, is in particular in:
1) tunnel all is different from conventional shield tunnel construction in negative earthing, zero earthing, ultra-shallow earth-covered stage surrounding soil distortion, section of jurisdiction stress, and also there is larger difference in synchronous grouting for the grand rule that influences heavy and the stable control in section of jurisdiction in the face of land;
2) on every side under the less situation of stratum confined pressure, need strict control grouting pressure to satisfy the come-up requirement in tunnel, slurry material need possess good pressure thixotropy and plastic fluidity under the less grouting pressure condition.
Based on the construction characteristic of ground discrepancy formula shield tunnel, the synchronous grouting control that shield launching is arrived the stage has caused difficulty, and injecting paste material, corollary equipment and construction parameter all are different from traditional shield synchronization slip casting technology on theory.
Present conventional shield synchronization slip casting construction technology, it in turn includes the following steps:
A) carry out the concentrated stirring production of slurries by High Precision Automatic feeding system at agitator;
B) slurries are delivered in the shield structure slurry storage tank through olive car, on-the-spot slurries receiving system, interim slurry storage tank, down-hole fortune slurry car;
C) the shield grouting system carries out synchronous grouting to the structure void that the shield tail produces when advancing.
Wherein, steps A) the initial slump of slurries is 9～14cm in, and sand factor is 50～60%, proportion 〉=1.9kg/L, anti-shearing yield strength 8h 〉=800pa, solid body shrinkage factor of later stage≤1%; Step C) setting of grouting pressure draws as calculated in: P=P1+P2, and wherein P1 is this slip casting point outside water and soil force value, and P2 is the Grouting Pipe pressure loss, and according to equipment situation in the shield structure, the pumping test by slurries before starting draws; Step C) can adopt 4 slip castings simultaneously of shield tail, grouting amount top and the bottom ratio 6:4.The construction technology schematic diagram is illustrated in fig. 1 shown below:
The shortcoming of prior art can be the cost height, at the bottom of the efficient, and similar problem such as time-consuming.In the traditional shield method construction of routine, adopt above-mentioned shield synchronization slip casting construction technology can reach the construction control requirement of designing requirement.But at the construction of ground discrepancy formula shield tunnel worker method, if adopt conventional traditional shield synchronization slip casting technology construction meeting to produce following problem:
1) the mobile filling capacity of slurries in the conventional synchronous grouting construction is relatively poor, and under ground discrepancy formula shield tunnel construction working condition (the surrounding soil confined pressure is less), slurry material does not possess the flowability that structure void is fully filled;
2) construction parameter (grouting amount, grouting pressure) in the conventional synchronous grouting technology all is to calculate under the situation of confined pressure around the consideration, the setting range of parameter value is bigger, and the construction of ground discrepancy formula shield tunnel worker method, grouting amount or grouting pressure are excessive, and then ground easily emits slurry or slurries with ground puncture, surface uplift; Grouting amount or grouting pressure are too small, and then structure void can't fully be filled, and cause the not good and peripheral ground generation sedimentation of tunnel stability.
Therefore be necessary to make and optimize targetedly and improvement, for example:
1) selects the slurry material of which kind of adaptation condition characteristic for use;
2) how grouting parameter is controlled in the work progress.
Summary of the invention
At defective of the prior art, the purpose of this invention is to provide a kind of ground discrepancy formula shield tunnel synchronous grouting technology job practices.
According to ground discrepancy formula shield tunnel synchronous grouting technology job practices provided by the invention, comprise the steps:
Step 1: produce slurries,
Step 2: determine the synchronous grouting construction parameter according to working condition, wherein, the synchronous grouting construction parameter comprises injection rate, top and the bottom pro rate and grouting pressure control;
Step 3: construct according to the synchronous grouting construction parameter;
Wherein, the match ratio of slurry material is:
Sand 1030,
Flyash 350,
Lime 40,
Swell soil 80,
Cement 40,
Additive 3.5,
Water 330.
Preferably, described step 1 comprises the steps:
Step 1.1: the match ratio of slurry material is split as mother liquor A and cement paste B;
Step 2.1: producing mother liquor A by the ground agitator, producing cement paste B at shield structure vehicle frame; Mother liquor A in production is delivered to shield structure vehicle frame slurry storing tank after, mix cement paste B again, utilize in the slurry storing tank mixer that mother liquor A and cement paste B are fully stirred the back and mix;
Wherein, the match ratio of mother liquor A is
Sand 1030,
Flyash 350,
Lime 40,
Swell soil 80,
Additive 3,
Water 280;
The match ratio of cement paste B is:
Cement 40,
Additive 0.5,
Water 50.
Preferably, in described step 2, if operating mode is 0.3D, then injection rate is 125%, and the top and the bottom pro rate is 4:5, grouting pressure control top 0～0.15MPa, bottom 0.05～0.35MPa.
Preferably, in described step 2, if operating mode is 0.1D, then injection rate is 110%, and the top and the bottom pro rate is 2:5, grouting pressure control top 0～0.10MPa, bottom 0.05～0.30MPa.
Preferably, in described step 2, if operating mode be≤-0.3D, then injection rate is 110%, only bottom slip casting, grouting pressure is controlled bottom 0～0.15MPa.
Method provided by the invention adopts conventional synchronous grouting construction can't satisfy the quality control on construction of this novel worker's method as a kind of brand-new worker's method, and compared with prior art, the present invention has following beneficial effect:
Slurry material more conventional slurry material possess better mobile filling capacity in performance indications;
Slurry material more conventional slurry material possess higher early strength in performance indications;
3. at the construction parameter that draws under the different working conditions of ground discrepancy formula shield tunnel, can effectively control construction quality.
Description of drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is conventional shield synchronization slip casting schematic diagram;
Fig. 2 is according to ground discrepancy formula shield tunnel operating mode synchronous grouting schematic diagram of the present invention;
Fig. 3 is slurries transport courses schematic diagram.
Among the figure:
1 is the section of jurisdiction;
2 is grouting layer;
3 is shield tail Grouting Pipe;
4 is shield structure housing;
5 is shield cutter;
6 for filling slurries;
7 is injected hole.
The specific embodiment
The present invention is described in detail below in conjunction with specific embodiment.Following examples will help those skilled in the art further to understand the present invention, but not limit the present invention in any form.Should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
The present invention is implemented by following technical scheme:
1. the configuration of slurry material
The cooperation of slurry material performance indications control is when carried out according to following table 1, table 2:
Table 1 synchronous grouting material match ratio
Table 2 synchronous grouting material performance indications
2. the production of slurry material and construction
Slurry material is implemented in work progress in the following manner:
1) match ratio with slurry material is split as A liquid (mother liquor) and B liquid (cement paste)
Table 3A liquid (mother liquor) match ratio
Table 4B liquid (cement paste) match ratio
Wherein A liquid (mother liquor) is produced at the ground agitator, and B liquid (cement paste) is produced at shield structure vehicle frame; A liquid (mother liquor) in production is delivered to shield structure vehicle frame slurry storing tank after, mix B liquid (cement paste) again, utilize in the slurry storing tank mixer that A liquid (mother liquor) and B liquid (cement paste) are fully stirred the back and mix.
The purpose of this operation is for guaranteeing that slurries prevent slump-loss and slurries setting and harden after producing in course of conveying, therefore the A liquid (mother liquor) that the slurries match ratio is split as cement-free is grown distance conveying for a long time, need to construct to the shield structure slurry storing tank when using, mix B liquid (cement paste) again and mix.
3. the control of grouting parameter
In formula shield tunnel work progress was come in and gone out on ground, the concrete construction parameter under the different working conditions was implemented in the following manner:
Synchronous grouting construction parameter under the different operating modes of table 5 ground discrepancy formula shield tunnel
More than specific embodiments of the invention are described.It will be appreciated that the present invention is not limited to above-mentioned specific implementations, those skilled in the art can make various distortion or modification within the scope of the claims, and this does not influence flesh and blood of the present invention.
Claims (5)
1. a ground discrepancy formula shield tunnel synchronous grouting technology job practices is characterized in that, comprises the steps:
Step 1: produce slurries,
Step 2: determine the synchronous grouting construction parameter according to working condition, wherein, the synchronous grouting construction parameter comprises injection rate, top and the bottom pro rate and grouting pressure control;
Step 3: construct according to the synchronous grouting construction parameter;
Wherein, the match ratio of slurry material is:
Sand 1030,
Flyash 350,
Lime 40,
Swell soil 80,
Cement 40,
Additive 3.5,
Water 330.
2. ground discrepancy formula shield tunnel synchronous grouting technology job practices according to claim 1 is characterized in that described step 1 comprises the steps:
Step 1.1: the match ratio of slurry material is split as mother liquor A and cement paste B;
Step 2.1: producing mother liquor A by the ground agitator, producing cement paste B at shield structure vehicle frame; Mother liquor A in production is delivered to shield structure vehicle frame slurry storing tank after, mix cement paste B again, utilize in the slurry storing tank mixer that mother liquor A and cement paste B are fully stirred the back and mix;
Wherein, the match ratio of mother liquor A is
Sand 1030,
Flyash 350,
Lime 40,
Swell soil 80,
Additive 3,
Water 280;
The match ratio of cement paste B is:
Cement 40,
Additive 0.5,
Water 50.
3. the ground according to claim 1 formula shield tunnel synchronous grouting technology job practices of coming in and going out, it is characterized in that, in described step 2, if operating mode is 0.3D, then injection rate is 125%, the top and the bottom pro rate is 4:5, grouting pressure control top 0～0.15MPa, bottom 0.05～0.35MPa.
4. the ground according to claim 1 formula shield tunnel synchronous grouting technology job practices of coming in and going out, it is characterized in that, in described step 2, if operating mode is 0.1D, then injection rate is 110%, the top and the bottom pro rate is 2:5, grouting pressure control top 0～0.10MPa, bottom 0.05～0.30MPa.
5. the ground according to claim 1 formula shield tunnel synchronous grouting technology job practices of coming in and going out is characterized in that, in described step 2, if operating mode be≤-0.3D, then injection rate is 110%, only bottom slip casting, grouting pressure is controlled bottom 0～0.15MPa.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103321656A (en) * | 2013-07-11 | 2013-09-25 | 西南交通大学 | Shield tunnel pipe piece designing method taking double-liquid synchronous grouting layer performance degradation into consideration |
| CN107459281A (en) * | 2017-08-16 | 2017-12-12 | 山东大学 | A kind of shield high performance synchronous slip casting modifying agent and preparation method and application |
| CN107831073A (en) * | 2017-11-02 | 2018-03-23 | 中山大学 | Shield-tunneling construction synchronous grouting experimental rig and test method |
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| 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 |
| JP2009249818A (en) * | 2008-04-01 | 2009-10-29 | Maeda Corp | Grout material for adhesion of waterproof sheet, and construction method |
| CN101575196A (en) * | 2009-06-01 | 2009-11-11 | 上海市第二市政工程有限公司 | Shield synchronous grouting slurry |
| CN102758641A (en) * | 2012-08-01 | 2012-10-31 | 上海城建（集团）公司 | Construction method for ultralarge-diameter shield synchronous grouting |
| CN103032075A (en) * | 2013-01-07 | 2013-04-10 | 上海隧道工程股份有限公司 | Construction method for building ground inlet and outlet type shield tunnel |
| CN103174439A (en) * | 2013-04-11 | 2013-06-26 | 上海隧道工程股份有限公司 | Construction method for shield tunnel slow condensing type synchronous grouting |
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2013
- 2013-07-01 CN CN201310271028.4A patent/CN103306688B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| JP2009249818A (en) * | 2008-04-01 | 2009-10-29 | Maeda Corp | Grout material for adhesion of waterproof sheet, and construction method |
| CN101575196A (en) * | 2009-06-01 | 2009-11-11 | 上海市第二市政工程有限公司 | Shield synchronous grouting slurry |
| CN102758641A (en) * | 2012-08-01 | 2012-10-31 | 上海城建（集团）公司 | Construction method for ultralarge-diameter shield synchronous grouting |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103321656A (en) * | 2013-07-11 | 2013-09-25 | 西南交通大学 | Shield tunnel pipe piece designing method taking double-liquid synchronous grouting layer performance degradation into consideration |
| CN107459281A (en) * | 2017-08-16 | 2017-12-12 | 山东大学 | A kind of shield high performance synchronous slip casting modifying agent and preparation method and application |
| CN107459281B (en) * | 2017-08-16 | 2019-09-24 | 山东大学 | A kind of shield high performance synchronous slip casting modifying agent and the preparation method and application thereof |
| CN107831073A (en) * | 2017-11-02 | 2018-03-23 | 中山大学 | Shield-tunneling construction synchronous grouting experimental rig and test method |
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Effective date of registration: 20151210 Address after: 200232 Shanghai city Xuhui District Wanping Road No. 1099 5 floor Patentee after: Shanghai Tunnel Engineering Co., Ltd. Patentee after: Shanghai Tunnel Engineering Co., Ltd. Patentee after: Shanghai Urban Construction (Group) Co., Ltd. Address before: 200082 No. 118, Dalian Road, Shanghai, Yangpu District Patentee before: Shanghai Tunnel Engineering Co., Ltd. Patentee before: Shanghai Urban Construction (Group) Co., Ltd. |