CN104074530A - Shield synchronous grouting construction method and construction material - Google Patents
Shield synchronous grouting construction method and construction material Download PDFInfo
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- CN104074530A CN104074530A CN201410269820.0A CN201410269820A CN104074530A CN 104074530 A CN104074530 A CN 104074530A CN 201410269820 A CN201410269820 A CN 201410269820A CN 104074530 A CN104074530 A CN 104074530A
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Abstract
The invention discloses a shield synchronous grouting construction method and a construction material. The construction material comprises liquid A and liquid B, wherein the liquid A comprises 25.5 weight percent of cement, 2.6 weight percent of bentonite, 0.4 weight percent of stabilizing agents and 71.5 weight percent of water; the liquid B is water glass; and the volume ratio of the liquid A to the liquid B is 8:1-15:1. During synchronous grouting construction, the liquid A is prepared in a mixing station, and the liquid A and the liquid B are respectively conveyed into a liquid A slurry storage tank and a liquid B slurry storage tank which are arranged on a shield machine; the liquid A and the liquid B are respectively conveyed into a mixer positioned at the shield tail part of the shield machine through a liquid A slurry injection pipe and a liquid B slurry injection pipe; and the liquid A and/or the liquid B in the mixer are/is synchronously injected into a shield tail building gap through a shield tail slurry injection pipe. The shield synchronous grouting construction method solves various problems in subsequent grouting, synchronous single slurry injection, in-time grouting and secondary grouting in the prior art through utilizing good performance of the liquid A and the liquid B before and after the mixing of the liquid A and the liquid B and combining a primary synchronous grouting process.
Description
Technical field
The present invention, for constructing tunnel field, particularly relates to a kind of shield synchronization slip casting construction method and construction material.
Background technology
In shield tunnel construction process, when shield tail is deviate from assembled shield duct piece, must cause the structure void between pipe-plate lining and the soil body, now need to carry out timely grouting at the tail of the shield machine, to prevent the loosening of shield duct piece surrounding soil, strengthen the package action of the soil body to shield duct piece liner structure simultaneously, avoid tunnel segment structure to occur stress raisers phenomenon because lacking necessary effect of elastic resistance.Grouting at the tail of the shield machine refers in the process of shield driving construction, after tunnel lining segment is assembled, when shield tail is deviate from tunnel, under certain grouting pressure, the appropriate injecting paste material that has certain early strength and final strength is inserted in the space after shield tail, after its consolidation and sclerosis, play structure void after filling wall, certain supporting capacity is provided, stablize the grouting method of pipe-plate lining.
The type of grouting at the tail of the shield machine is divided into slip casting afterwards, synchronous grouting, slip casting in time and secondary grouting, wherein the control of surface settlement and tunnel upward floating is required to the general synchronous grouting that adopts in stricter situation, and secondary grouting is measure as a supplement.In China's shield tunnel construction, maximum synchronous grouting of use is the single liquid slurry of synchronous note at present, synchronously notes single liquid slurry and in construction, has many defects:
1) synchronously note single liquid slurry early strength low, the later stage lacks chemical stability, is easy to segregation, can not effectively control tunnel and departs from the floating after shield tail and keep the longitudinal stability in tunnel later stage.2) slip casting number of dropouts is large, and slip casting total amount is not easy to control, and when especially shield structure is through Fu Shui stratum, because the factors such as the number of dropouts of single liquid slurry is large cause being difficult to fill completely section of jurisdiction and the gap of excavating between wall, easily causes the sedimentation on ground excessive.3) it is long that single liquid is starched the initial setting time, and early strength cannot be provided fast.4) single liquid slurry is easily emanated, and gives transportation, stores and cause difficulty.
Summary of the invention
For addressing the above problem, the invention provides a kind of initial setting time short, early stage, later strength is high, is difficult for segregation, can effectively fill structure void, prevents tunnel duct piece floating and distortion; Agglutination after mixing, good fluidity, anti-dispersiveness is strong, easily guarantees grouting amount, the easily construction material of transportation and long period storage, and the shield synchronization slip casting construction method that relies on this construction material to complete.
The technical solution adopted for the present invention to solve the technical problems is: a kind of shield synchronization slip casting construction method, comprises the following steps:
1) in agitator, configure A liquid, respectively A liquid and B liquid are delivered in the A liquid slurry can and B liquid slurry can on shield machine; Described A liquid comprises the cement of 25.5wt%, the stabilizing agent of the swell soil of 2.6wt%, 0.4wt% and the water of 71.5wt%; Described B liquid is water glass;
2) described A liquid and B liquid are delivered to by A liquid grout pipe and B liquid grout pipe the blender that is arranged in shield machine shield tail place respectively;
3) in blender A liquid and/or B liquid by grouting at the tail of the shield machine pipe simultaneous implantation in shield tail structure void.
Be further used as the improvement of technical solution of the present invention, described stabilizing agent is one or more in naphthalene series high-efficiency water-reducing agent, polycarboxylic acid series high efficiency water reducing agent, melamine superplasticizer or amido sulfoacid series high-efficiency water reducer.
Be further used as the improvement of technical solution of the present invention, described step 2) in, the volume ratio of described A liquid and B liquid is 8 ︰ 1～15 ︰ 1.
Be further used as the improvement of technical solution of the present invention, step 2) in, when starting, slip casting first injects A liquid 1-2 minute, inject afterwards B liquid, and when slip casting finishes, first stop injecting B liquid and after ten minutes, stop again the injection of A liquid.
Be further used as the improvement of technical solution of the present invention, grouting at the tail of the shield machine pipe carries out multiple spot slip casting to the shield tail structure void in shield duct piece outside simultaneously.
Be further used as the improvement of technical solution of the present invention, in described step 1), load weighted swell soil is added to the water, and with mixer, stirs, and makes that swell soil is dispersed to be opened; In solution, add load weighted stabilizing agent, stir, then add load weighted cement in solution, after stirring, A liquid prepared complete.
Be further used as the improvement of technical solution of the present invention, described A liquid grout pipe, B liquid grout pipe and grouting at the tail of the shield machine Guan Jun are usingd frequency conversion type extrusion pump as slip casting power.
Be further used as the improvement of technical solution of the present invention, setting pressure sensor on A liquid grout pipe and B liquid grout pipe, in slip casting process, the moment is noted the injection pressure of A liquid and B liquid.
A shield synchronization slip casting construction material, comprises A liquid and B liquid, and wherein, described A liquid comprises the cement of 25.5wt%, the stabilizing agent of the swell soil of 2.6wt%, 0.4wt% and the water of 71.5wt%; Described B liquid is water glass, and the volume ratio of described A liquid and B liquid is 8 ︰ 1～15 ︰ 1.Described stabilizing agent is one or more in naphthalene series high-efficiency water-reducing agent, polycarboxylic acid series high efficiency water reducing agent, melamine superplasticizer or amido sulfoacid series high-efficiency water reducer.
Beneficial effect of the present invention: shield synchronization slip casting construction material provided by the invention comprises A liquid, B liquid.By composition and the content of each component in reasonable adjustment A liquid, and the mixed proportion of A liquid and B liquid, compressive strength, bleeding rate, time of setting and the mobility of control construction material, before mixing A liquid, B liquid, A liquid good stability, the easily storage of transportation and long period.Agglutination after the mixed liquor slurry that A liquid, B liquid are mixed to form mixes, good fluidity, anti-dispersiveness is strong, easily guarantees grouting amount; Simultaneously to enter the initial setting time short, early stage, later strength is high, is difficult for segregation, can effectively fill shield tail structure void, prevents tunnel duct piece floating and distortion, can effectively guarantee quality, safety and the progress of shield-tunneling construction for mixed liquor.The present invention is based on above-mentioned construction material, a kind of shield synchronization slip casting construction method be provided, after according to specific ratio, A liquid, B liquid being mixed, in shield machine construction, at shield tail simultaneous implantation in shield tail structure void.This shield synchronization slip casting construction method relies on A liquid, B liquid good performance before and after mixing, and in conjunction with a synchronous grouting technique, has solved slip casting afterwards in prior art, has synchronously noted the many difficult problems that exist in single liquid slurry, slip casting in time and secondary grouting.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is shield synchronization slip casting construction method schematic diagram of the present invention.
The specific embodiment
The invention provides a kind of shield synchronization slip casting construction material, comprise A liquid and B liquid, wherein, described A liquid comprises the cement of 25.5wt%, the stabilizing agent of the swell soil of 2.6wt%, 0.4wt% and the water of 71.5wt%; Described B liquid is water glass, and the volume ratio of described A liquid and B liquid is 8 ︰ 1～15 ︰ 1.Described stabilizing agent is one or more in naphthalene series high-efficiency water-reducing agent, polycarboxylic acid series high efficiency water reducing agent, melamine superplasticizer or amido sulfoacid series high-efficiency water reducer.
The biliquid slurry initial setting time that described A liquid and B liquid form is 10s～14s; 28d uniaxial compressive strength is not less than 2.5Mpa; There is good water resistant dispersiveness and the property noted, gelling time is generally 4～10h, within one day, be not less than 0.2MPa(and be equivalent to soft rock stratum unconfined compression strength), within 28 days, be not less than 2.5MPa(and be slightly larger than the natural compressive strength of strong-weathered rock), slurries calculus rate >95%, be fixed shrinkage factor <5%, liquid denseness 8～12cm, pulp stability (staticly settling the ratio of rear floating water volume and cumulative volume) is less than 5%.
In order to determine above-mentioned A fluid component proportioning, and the volume ratio of A liquid and B liquid to compare respectively test as follows:
Selecting the volume ratio of A liquid and B liquid is 8 ︰ 1, adjusts each constituent mass mark in A liquid, makes proportioning 1-5, as table 1.
Each component proportion in A liquid when the volume ratio of table 1 A liquid and B liquid is 8 ︰ 1
Press A fluid component proportioning in table 1, and the volume ratio of A liquid and B liquid, the key property of A liquid and B liquid mixed construction material is as table 2.
Table 2 is pressed the key property of 1-5 proportioning A liquid and B liquid mixed construction material in table 1
From table 1 and table 2,1., along with the reducing of A liquid water/binder ratio, the degree of mobilization of A liquid increases gradually, and after degree of mobilization is too large, A liquid is easily in slip casting tube wall deposition, and the of a specified duration grouting pipeline channel narrows that easily causes is from affecting mixing of A liquid and B liquid; After degree of mobilization is too little, in A liquid, easily occur the laminated segregation phenomenon of cement and water, so the degree of mobilization of A liquid must be in a suitable interval.2. along with the reducing of A liquid water/binder ratio, reduce the time of setting of the biliquid slurry that A liquid and B liquid form gradually.3. reducing along with A liquid water/binder ratio, biliquid slurry 1h, 1d, 7d, 28d compressive strength that A liquid and B liquid form all show the rule increasing gradually, wherein 1h compressive strength with A liquid water/binder ratio to reduce amplitude of variation less, measured proportioning 1 to the 28d compressive strength of proportioning 5 has all reached 2.5MPa, reduces as can be seen here water/binder ratio very obvious to the compressive strength of raising biliquid slurry.But water/binder ratio is not the smaller the better, because water/binder ratio is reduced to a certain degree and can impacts the property noted of slurries afterwards, thereby likely cause and biliquid slurry time of setting too fastly cause plugging, after water/binder ratio reduces in addition, cement consumption increases, thereby slip casting cost also increases economy variation, so choosing of biliquid pulp-water gray scale need to consider these factors.4. bleeding rate is the important indicator of reflection A liquid water retention, if bleeding rate is too high, to the intensity of test block, can have a significant impact, and is guaranteeing that under the condition that mobility is certain, bleeding rate is more low better.Consider technology and economic factor, A liquid optimum ratio 2.
Select the A liquid of proportioning 2, adjust the volume ratio of A liquid and B liquid, make proportioning 6-14, as table 3.
Table 3 selects the A liquid of proportioning 2 to adjust the volume ratio of A liquid and B liquid
Select the A liquid of proportioning 2, adjust the volume ratio of A liquid and B liquid, the key property of A liquid and B liquid mixed construction material is as table 4.
Table 4 is pressed the key property of 6-14 proportioning A liquid and B liquid mixed construction material in table 3
Experimental data result in his-and-hers watches 4 is analyzed and can be drawn the following conclusions:
1) along with the increasing of B liquid consumption in A liquid and B liquid biliquid slurry, show the rule increasing gradually the time of setting of biliquid slurry.When the volume ratio of A liquid and B liquid is greater than 8 ︰ 1, change little the time of setting of biliquid slurry, and basic expressions goes out the linear rule increasing; And when the consumption of B liquid is increased to certain value, there will be a flex point suddenly increasing the time of setting of biliquid slurry.
2) along with the increase of water glass consumption in A liquid and B liquid biliquid slurry, biliquid slurry 1h, the 1d of test specimen are, the compressive strength of 7d, 28d all shows the rule of first increases and then decreases, and wherein the compressive strength amplitude of variation of 1h changes comparatively obvious compared with compressive strength little and 1d, 7d and 28d.The data of surveying from test can find, in biliquid slurry, the consumption of water glass is not The more the better, when water glass consumption is within the specific limits time, can improve the early strength of biliquid slurry test specimen and along with the increase of consumption, intensity also increases; But after water glass consumption surpasses certain limit, run counter to desire, the intensity of biliquid slurry test specimen does not increase on the contrary and can sharply reduce.
In sum, take technology and economic factor into consideration, the volume ratio of A liquid and B liquid is preferably 8 ︰ 1～15 ︰ 1.
With reference to Fig. 1, the invention provides a kind of shield synchronization slip casting construction method, comprise the following steps:
1) in agitator, configure A liquid, respectively described A liquid and B liquid are delivered in the A liquid slurry can and B liquid slurry can on shield machine, described A liquid comprises the cement of 25.5wt%, the stabilizing agent of the swell soil of 2.6wt%, 0.4wt% and the water of 71.5wt%, described stabilizing agent is one or more in naphthalene series high-efficiency water-reducing agent, polycarboxylic acid series high efficiency water reducing agent, melamine superplasticizer or amido sulfoacid series high-efficiency water reducer, and described B liquid is water glass;
2) described A liquid and B liquid are delivered to by A liquid grout pipe and B liquid grout pipe the blender that is arranged in shield machine shield tail place respectively; When slip casting starts, first inject A liquid 1-2 minute, inject afterwards B liquid, and to make the volume ratio of described A liquid and B liquid be 8 ︰ 1～15 ︰ 1; When slip casting finishes, first stop injecting B liquid and after ten minutes, stop again the injection of A liquid.
3) in blender, A liquid and/or B liquid are by grouting at the tail of the shield machine pipe simultaneous implantation in shield tail structure void, and grouting at the tail of the shield machine pipe adopts the slip casting simultaneously of four some positions, is respectively 1 position, 5 positions, 7 positions and 11 positions; .
In described step 1), load weighted swell soil is added to the water, and with mixer, stirs, and makes that swell soil is dispersed to be opened; In solution, add load weighted stabilizing agent, stir, then add load weighted cement in solution, after stirring, A liquid prepared complete.
Described A liquid grout pipe, B liquid grout pipe and grouting at the tail of the shield machine Guan Jun are usingd frequency conversion type extrusion pump as slip casting power.
Setting pressure sensor on A liquid grout pipe and B liquid grout pipe, constantly notes the injection pressure of A liquid and B liquid in slip casting process, avoid because of injection pressure excessive, and the destruction that may cause part, section of jurisdiction or whole floating, faulting of slab ends, cracking, crushing or other form.
Certainly, the invention is not limited to above-mentioned embodiment, those of ordinary skill in the art also can make equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and the modification that these are equal to or replacement are all included in the application's claim limited range.
Claims (10)
1. a shield synchronization slip casting construction method, is characterized in that, comprises the following steps:
1) in agitator, configure A liquid, respectively A liquid and B liquid are delivered in the A liquid slurry can and B liquid slurry can on shield machine; Described A liquid comprises the cement of 25.5wt%, the stabilizing agent of the swell soil of 2.6wt%, 0.4wt% and the water of 71.5wt%; Described B liquid is water glass;
2) described A liquid and B liquid are delivered to by A liquid grout pipe and B liquid grout pipe the blender that is arranged in shield machine shield tail place respectively;
3) in blender A liquid and/or B liquid by grouting at the tail of the shield machine pipe simultaneous implantation in shield tail structure void.
2. shield synchronization slip casting construction method according to claim 1, is characterized in that: described stabilizing agent is one or more in naphthalene series high-efficiency water-reducing agent, polycarboxylic acid series high efficiency water reducing agent, melamine superplasticizer or amido sulfoacid series high-efficiency water reducer.
3. shield synchronization slip casting construction method according to claim 1, is characterized in that: described step 2), the volume ratio of described A liquid and B liquid is 8 ︰ 1～15 ︰ 1.
4. shield synchronization slip casting construction method according to claim 1, is characterized in that: described step 2), first inject A liquid 1-2 minute when slip casting starts, inject afterwards B liquid, first stop injecting B liquid and after ten minutes, stop the injection of A liquid again when slip casting finishes.
5. shield synchronization slip casting construction method according to claim 1, is characterized in that: grouting at the tail of the shield machine pipe carries out multiple spot slip casting to the shield tail structure void in shield duct piece outside simultaneously.
6. shield synchronization slip casting construction method according to claim 1, is characterized in that: in described step 1), load weighted swell soil is added to the water, and with mixer, stirs, and makes that swell soil is dispersed to be opened; In solution, add load weighted stabilizing agent, stir, then add load weighted cement in solution, after stirring, A liquid prepared complete.
7. shield synchronization slip casting construction method according to claim 1, is characterized in that: described A liquid grout pipe, B liquid grout pipe and grouting at the tail of the shield machine Guan Jun are usingd frequency conversion type extrusion pump as slip casting power.
8. shield synchronization slip casting construction method according to claim 1, is characterized in that: setting pressure sensor on A liquid grout pipe and B liquid grout pipe, in slip casting process, the moment is noted the injection pressure of A liquid and B liquid.
9. a shield synchronization slip casting construction material, is characterized in that: comprise A liquid and B liquid, wherein, described A liquid comprises the cement of 25.5wt%, the stabilizing agent of the swell soil of 2.6wt%, 0.4wt% and the water of 71.5wt%; Described B liquid is water glass, and the volume ratio of described A liquid and B liquid is 8 ︰ 1～15 ︰ 1.
10. shield synchronization slip casting construction material according to claim 9, is characterized in that: described stabilizing agent is one or more in naphthalene series high-efficiency water-reducing agent, polycarboxylic acid series high efficiency water reducing agent, melamine superplasticizer or amido sulfoacid series high-efficiency water reducer.
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| CN106007639A (en) * | 2016-05-19 | 2016-10-12 | 佛山市泰迪斯材料有限公司 | Preparation method of high-viscosity thixotropic slurry |
| CN106948828A (en) * | 2017-05-07 | 2017-07-14 | 中铁十八局集团有限公司 | A kind of device that secondary grouting is carried out using shield synchronization slip casting equipment |
| CN107120121A (en) * | 2017-05-31 | 2017-09-01 | 中建三局基础设施工程有限公司 | A kind of shield-tunneling construction supplements slip casting anti-settling control method in real time |
| CN107165655A (en) * | 2017-06-29 | 2017-09-15 | 山东科技大学 | A kind of backfilling grouting method in the driving for complete-section tunnel boring machine |
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| CN104481548B (en) * | 2014-11-01 | 2016-05-11 | 中铁一局集团有限公司 | A kind of shield tunnel construction face void handling method |
| CN105257303A (en) * | 2015-10-28 | 2016-01-20 | 广州广隧机电设备有限公司 | Construction method capable of achieving synchronous double-grout grouting during shield tunneling |
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| CN106948828A (en) * | 2017-05-07 | 2017-07-14 | 中铁十八局集团有限公司 | A kind of device that secondary grouting is carried out using shield synchronization slip casting equipment |
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