阅读说明：本技术 一种脉冲式注浆机、一种双液注浆施工方法 (Pulse grouting machine and double-liquid grouting construction method ) 是由 郭小雄 赵鹏 马伟斌 王志伟 付兵先 邹文浩 常凯 马超锋 安哲立 徐湉源 李尧 于 2020-06-29 设计创作，主要内容包括：本发明提供了一种脉冲式注浆机、一种双液注浆施工方法,采用梅花桩型布置注浆孔中间区域一点注浆的方式进行注浆,注浆密实无死角,注浆效果好,注浆压力小效率高,混合浆液凝结速度较快的情况下也不容易堵仓。使用脉冲式注浆机高低压错峰注浆实现预混,混合管二次混合,振动器三次深混,注浆速度可控,在浆体水下抗分散性好、粘聚性高的情况下,提高了混合效率和均匀程度。设计的A、B组分单液,单液组份可工作时间长,当双液混合后,水下抗分散性好,凝结硬化速度快,满足铁路隧道地基脱空区域水下快速修补的需求,且双液注浆不会因为凝结速度过快堵管而影响到施工。可通过控制A组分和B组分的比例可调整混合浆液的可工作时间。(The invention provides a pulse grouting machine and a double-liquid grouting construction method, which are used for grouting in a mode that a little grouting is performed in the middle area of a quincuncial pile-shaped grouting hole, so that grouting is compact and has no dead angle, the grouting effect is good, the grouting pressure is small, the efficiency is high, and bin blockage is not easy to occur under the condition that the coagulation speed of mixed grout is high. The pulse grouting machine is used for high-low pressure peak staggering grouting to realize premixing, the mixing pipes are mixed for the second time, the vibrators are deeply mixed for the third time, the grouting speed is controllable, and the mixing efficiency and the uniformity are improved under the conditions that the underwater slurry is good in dispersibility resistance and high in cohesiveness. The designed A, B component single liquid has long working time, and after the double liquids are mixed, the underwater anti-dispersion property is good, the setting and hardening speed is high, the underwater rapid repair requirement of the railway tunnel foundation void area is met, and the construction cannot be influenced by the excessively rapid pipe blockage of the setting speed in the double liquid grouting process. The workable time of the mixed slurry can be adjusted by controlling the ratio of the a component and the B component.)

1. The utility model provides an impulse type slip casting machine, a serial communication port, impulse type slip casting machine, including a plurality of holding vessel (2), set up pressure device (1) on every holding vessel (2) respectively, every holding vessel (2) respectively with mixing tube (7) one end intercommunication, suit vibrator (8) on mixing tube (7), vibrator (8) are connected with motor frequency modulator (9), set up flow control valve (3) between every holding vessel (2) and mixing tube (7) respectively, mixing tube (7) other end and mixed thick liquid slip casting pipe (10) intercommunication.

2. Pulse grouting machine according to claim 1, characterized in that each storage tank (2) communicates with one end of a mixing pipe (7) through a pipe (4).

3. A pulse grouting machine according to claim 1 or 2, characterized in that said pressure device (1) and said flow control valve (3) are connected to a control unit (5), respectively.

4. A pulse grouting machine according to claim 1 or 2, characterized in that the mixed slurry grouting pipe (10) is connected with a grouting gun head (6).

5. A pulse grouting machine according to claim 2, characterised in that a flow control valve (3) is arranged in each pipe (4), the flow control valve (3) being arranged in a position close to one side of the storage tank (2).

6. The pulse grouting machine according to claim 1 or 2, characterized in that a plurality of flow guide damping fins (11) are arranged on the inner wall of the mixing pipe (7), and the flow guide damping fins (11) are arranged in a structure extending towards different directions.

7. Pulse grouting machine according to claim 6, characterized in that the length of the flow-guiding damping fins (11) is 1/10-1/5 of the inner diameter of the mixing pipe (7).

8. The double-liquid grouting construction method is characterized in that grouting is carried out by the pulse grouting machine of any one of claims 1 to 7, and specifically comprises the following steps:

s1, positioning and drilling after determining a grouting filling area of the foundation void;

and S2, respectively placing the two-component grouting liquid into different storage tanks 2 of the pulse grouting machine, controlling the pulse grouting machine to perform high-low pressure peak shifting grouting at the same frequency, and starting grouting after the grouting gun head 6 discharges the slurry until the completion.

9. The double-fluid grouting construction method of claim 8, wherein the drilling of the hole in step S1 is a quincuncial pile positioning drilling.

10. The two-fluid grouting construction method of claim 8 or 9, wherein in step S1, the diameter of the grouting hole drilled is 25-35mm, and the hole density is 8-12/m²The hole spacing is 0.30-0.35m, and the drilling depth is such that the grouting holes are communicated with the void region.

11. The double-liquid grouting construction method according to claim 8 or 9, characterized in that in step S2, the double-component grouting liquid is respectively placed in two storage tanks (2) of a pulse grouting machine, the pulse grouting machine is started to remove air so that the pipeline (4) is fully discharged, then the machine is stopped, the two pipelines (4) are connected with a mixing pipe (7), a control component (5) is used to control a pressure device (1) and a flow control valve (3) so that the two single liquids are grouted at the same frequency in a high-pressure and low-pressure staggered peak mode, the two single liquids enter the mixing pipe (7) through the pipeline, a motor frequency modulator (9) is used to adjust the vibration frequency of a vibrator (8), the vibrator (8) is used to drive the mixing pipe (7) to synchronously vibrate so as to realize the double mixing of the static mixing and high-frequency dispersion of the double-component grouting liquid, the two single liquids are fully and uniformly mixed, and the mixed grouting liquid reaches a gun head (6) through a mixed grouting pipe (, and (3) starting grouting for the grouting holes, selecting one grouting hole from the central grouting filling area to start grouting, and after saturated thick slurry is discharged from the slurry outlet holes at the two sides, sequentially blocking the grouting holes by using wood plugs or hole covers until the grouting filling of the whole area is completed.

12. The double-fluid grouting construction method according to claim 11, characterized in that the grouting frequency is controlled to be 20-40 times/min; the grouting speed is controlled to be 2-10L/min.

13. The double-fluid grouting construction method as claimed in claim 11, wherein the inner diameter of the mixing pipe (7) is phi 25-35 mm; the frequency of the vibrator 8 is 1000-2000 Hz.

14. The two-fluid grouting construction method according to claim 11, wherein the two-component grouting fluid of step S2 is a single fluid of a component a and a single fluid of a component B, respectively; the component A single liquid is obtained by adding water to the component A; the component B single liquid is obtained by adding water to the component B; the component A comprises the following raw materials in percentage by mass:

80-90% of cementing material, 3-10% of active admixture, 3-7% of expanding agent, 2-3% of high-performance underwater anti-dispersant and 0.1-0.3% of polycarboxylic acid high-performance water reducing agent;

the total of the raw materials of the component A is 100 percent;

the component B comprises the following raw materials in percentage by mass: 80-90% of rapid hardening cementing material, 4-10% of active admixture, 3-7% of expanding agent, 2-3% of high-performance underwater anti-dispersant, 0.1-0.3% of polycarboxylic acid high-performance water reducing agent, 0.1-0.2% of retarder, 0.1-0.2% of early strength admixture, 0.1-0.15% of thixotropic agent and 0.05-0.1% of interface wetting agent;

the total of the raw materials of the component B is 100 percent.

15. The double-liquid grouting construction method as claimed in claim 14, wherein the mass ratio of the A-component single liquid to the B-component single liquid is 0.3-1: 1.

16. The two-fluid grouting construction method of claim 14, wherein the expanding agent in the component a and the component B is a mixture of a plastic expanding agent and a hardening-period expanding agent, and the ratio of the plastic expanding agent: the mass ratio of the swelling agent in the hardening period is 1-2: 100.

17. the two-fluid grouting construction method of claim 14, wherein the high-performance underwater anti-dispersant in the component A and the component B is a mixture of hydroxypropyl methyl cellulose ether, polyacrylamide, polyvinyl alcohol and zeolite powder, and the mass ratio of the hydroxypropyl methyl cellulose ether: polyacrylamide: polyvinyl alcohol: and (2) zeolite powder is 15-20: 5-10: 5-10: 100.

18. the two-fluid grouting construction method of claim 14, wherein the thixotropic agent in the component B is one or more of magnesium aluminum silicate, polyamide wax, metakaolin or sodium bentonite.

19. The two-fluid grouting construction method of claim 14, wherein the interface sizing agent in the component B is one or more of vinyltriethoxysilane or isobutyltriethoxysilane.

20. The two-fluid grouting construction method according to claim 14, wherein the preparation method of the two-component grouting liquid comprises the following steps:

1) preparation of a component A: stirring the gelling material, the active admixture, the expanding agent and the high-performance underwater anti-dispersant in the component A for 5-10min by using a mixer, and then adding the polycarboxylic acid high-performance water reducing agent in the formula amount and stirring for 5min to obtain the component A;

2) b, preparation of a component: stirring the quick-hardening cementing material, the active admixture, the expanding agent and the high-performance underwater anti-dispersant in the formula amount in the component B for 5-10min by using a mixer, then adding the rest material in the formula amount in the component B, and continuously stirring for 5min to obtain the component B;

3) when the prepared component A and the component B are added with water and stirred, the mass ratio of water to material is (0.25-0.28): 1, obtaining the product.

Technical Field

The invention belongs to the field of underwater grouting repair and rapid repair engineering of a railway tunnel ballast bed void area, and particularly relates to a pulse grouting machine and a double-liquid grouting construction method, in particular to a construction method of a rapid-setting adjustable cement-based underwater anti-dispersion rapid-hardening grouting material.

Background

The working conditions faced by the rapid repair engineering are very complex, and many underwater grouting repairs are involved, such as railway tunnel ballast bed void repair, underwater pier column reinforcement, underground waterproof curtain grouting and the like. Taking underwater repair engineering of a railway tunnel ballast bed void area as an example, the existing grouting repair technology is mainly divided into two main types according to materials: organic high polymer grouting technology and cement-based grouting technology. The organic polymer grouting technology has the advantages of fast hardening, large expansion coefficient and the like, but has the problems of high repairing cost, fine and complex grouting process control, unstable interface combination, low consolidation strength, poor durability and the like. The cement-based grouting technology has the advantages of no pollution, low cost, high strength and the like, but has the problems of low underwater hardening speed, poor dispersibility resistance and low early strength, and cannot meet the requirement of quickly repairing the traffic in a skylight period.

In addition, the existing double-liquid grouting construction method cannot enable double components to be uniformly mixed, the using effect of slurry is influenced, pipe blockage is easily caused, and the construction process is influenced.

According to the problems in the prior art, a grouting construction method which is low in cost, high in construction efficiency, good in grouting effect, not dispersed underwater, high in strength of a consolidation body, high in setting and hardening speed and adjustable in working time is needed to be researched and developed aiming at underwater grouting repair and rapid repair engineering of a railway tunnel ballast bed void area.

Disclosure of Invention

The invention aims to provide a pulse grouting machine, wherein multi-component grouting liquid can realize three-time deep mixing, the grouting speed is controllable, and the mixing efficiency and the uniformity are improved under the conditions of good underwater dispersion resistance and high cohesiveness of the grouting liquid.

The invention aims to provide a double-liquid grouting construction method, which has the advantages of compact grouting, no dead angle, good grouting effect, improved mixing efficiency and uniformity, and no influence on construction due to pipe blockage caused by too high condensation speed; in addition, by adopting the designed A, B component, the working time of the mixed slurry can be adjusted, the problems of low coagulation speed, low strength, poor underwater dispersibility resistance and the like are solved, and the construction cannot be influenced by pipe blockage caused by too high coagulation speed.

The specific technical scheme of the invention is as follows:

the utility model provides an impulse type slip casting machine, including a plurality of holding tanks, set up pressure device on every holding tank respectively, every holding tank respectively with hybrid tube one end intercommunication, the suit vibrator on the hybrid tube, the vibrator is connected with motor frequency modulator, sets up flow control valve between every holding tank and the hybrid tube respectively, the hybrid tube other end and mixed thick liquid slip casting pipe intercommunication.

Each storage tank is communicated with one end of the mixing pipe through a pipeline, and the single liquid enters the mixing pipe from the storage tanks through the pipelines; the mixing pipe is detachable.

Each pipeline is provided with a flow control valve which is arranged on a structure close to one side of the storage tank.

The pressure device and the flow control valve are respectively connected with the control component.

The mixed slurry grouting pipe is connected with the grouting gun head and communicated with the grouting gun head, and slurry reaches the grouting gun head through the mixed slurry grouting pipe to realize grouting.

The control component is arranged into a structure capable of controlling the pressure device to adjust and control the internal pressure of the storage tank so as to control the grouting pressure, so that the slurry in the storage tank enters the pipeline and reaches the mixing pipe, and then reaches the grouting gun head through the mixed slurry grouting pipe, so that grouting is realized.

The control component is set to be a structure capable of controlling the opening of the flow control valve and adjusting the change of the opening frequency.

The vibrator is connected with the motor frequency modulator to adjust the vibration frequency of the vibrator, and further control over the vibration frequency of the slurry in the mixing pipe is achieved.

The slurry is mixed by adopting a combined mode that a mixing pipe is sleeved with a vibrator, and the vibrator and the mixing pipe synchronously vibrate to realize dual mixing of static mixing and high-frequency dispersion of the slurry.

Each pipeline is connected with the same mixing pipe.

The inner wall of the mixing pipe is provided with a plurality of flow guide damping fins, and the flow guide damping fins in different directions are arranged into structures extending to different directions.

Controlling the grouting frequency to be 20-40 times/min through a flow control valve;

controlling the grouting speed to be 2-10L/min;

the inner diameter of the mixing pipe is phi 25-35 mm;

the frequency of the vibrator is 1000-2000 Hz.

Preferably, as shown in fig. 1, when the pulse grouting machine is used for two-fluid grouting, the pulse grouting machine includes two storage tanks, each storage tank is respectively communicated with one end of the same mixing pipe through a pipeline, each storage tank is respectively provided with a pressure device, each pipeline is respectively provided with a flow control valve, and the flow control valve is arranged in a structure close to one side of the storage tank. The opening and closing frequency of the flow control valve is controlled through the control component to adjust the grouting frequency, the pressure device is adjusted through the control component to control the single-liquid grouting pressure, and the grouting speed is controlled through the single opening time and angle of the flow control valve under certain pressure. The grouting frequency of the two single liquids is kept consistent, the high pressure and the low pressure of the pressure devices of the two storage tanks are adjusted through the control part, the grouting speed is controlled by adjusting the grouting pressure, the high pressure and the low pressure are enabled to carry out peak staggering grouting when synchronous grouting is started, the two single liquids alternately enter the mixing pipe, and the method is equivalent to that the two single liquids are premixed for the first time in advance before mixing; moreover, the same-frequency high-pressure and low-pressure peak-shifting grouting can ensure that two single liquids are uniformly mixed, and the dosage ratio of the two single liquids can be accurately controlled. The mixed slurry is mixed for the second time through a mixing pipe; the vibrator is connected with the motor frequency modulator, and the vibration frequency of the vibrator arranged on the mixing pipe is controlled by the motor frequency modulator to carry out deep mixing for the third time, so that the mixing uniformity of the slurry is fully ensured, and the purposes of quick hardening, early strengthening and controllable setting time of the mixed slurry are achieved.

A double-liquid grouting construction method utilizes the pulse grouting machine for grouting, and specifically comprises the following steps:

s1, positioning and drilling after determining a grouting filling area of the foundation void;

and S2, respectively placing the two-component grouting liquid into different storage tanks of the pulse grouting machine, controlling the pulse grouting machine to perform high-low pressure peak staggering grouting at the same frequency, and starting grouting after the grouting gun head discharges the slurry until the completion.

Step S1, drilling holes, namely positioning and drilling holes in a quincuncial pile shape;

preferably, in step S1, after determining the void region and depth of the foundation by the elastic wave radar, the quincuncial pile positioning drilling is performed according to the area of the region, so that each grouting hole is communicated with the void region.

Further, in step S1, the hole diameter of the grouting hole obtained by drilling is 25-35mm, and the hole density is 8-12 holes/m²The hole spacing is 0.30-0.35m, and the drilling depth is such that the grouting holes are communicated with the void region;

in step S1, after the drill hole is positioned, cleaning is carried out; preferably, a high-pressure water gun is used for cleaning, so that each grouting hole is communicated with the void area.

In the step S1, the quincuncial pile type grouting holes communicated with the void area are arranged, compared with single-row hole grouting, slurry can be uniformly distributed in the cavity layer, the slurry can fill the crack dead angle position at the side of the void area more easily, the distance between the grouting holes is closer, the grouting pressure for grouting one point by selecting one grouting hole in the central area is smaller, the grouting efficiency is higher, and bin blockage caused by high coagulation speed of mixed slurry is not easy to occur.

Step S2, two-component grouting liquid is respectively placed in two storage tanks of a pulse grouting machine, the pulse grouting machine is started to exhaust air to enable a pipeline to be full and discharged, then the machine is stopped, the pipeline is connected with a mixing pipe, a control part is used for controlling a pressure device and a flow control valve to enable two single liquids to be subjected to peak staggering grouting at high and low pressures with the same frequency, the two single liquids enter the mixing pipe through the pipeline, the vibration frequency of a vibrator is adjusted through a motor frequency modulator, the mixing pipe is driven to synchronously vibrate through the vibrator to realize double mixing of static mixing and high-frequency dispersion of the two-component grouting liquid, the two single liquids are fully and uniformly mixed, the mixed grouting liquid reaches a grouting gun head through the mixed grouting liquid grouting pipe, grouting can be started for a grouting hole, one grouting hole is selected from a grouting filling central area, after saturated grouting holes at two sides are discharged, the two-component grouting liquid is sequentially blocked by using a wooden plug or a hole, until the grouting filling of the whole area is completed.

Preferably, the grouting frequency is controlled to be 20-40 times/min by a flow control valve;

controlling the grouting speed to be 2-10L/min;

the inner diameter of the mixing pipe is phi 25-35 mm;

the frequency of the vibrator is 1000-2000 Hz.

And further, stopping the machine after grouting is finished, observing the slurry falling condition, and supplementing slurry if the slurry falls.

The two-component grouting liquid in the step S2 is an A-component single liquid and a B-component single liquid respectively;

the single liquid of the component A is cement-based underwater anti-dispersion grouting material, and the single liquid of the component B is cement-based quick setting exciting material.

In the step S2, the component A single solution is obtained by adding water to the component A; the component B single liquid is obtained by adding water to the component B;

the component A comprises the following raw materials in percentage by mass:

80-90% of cementing material, 3-10% of active admixture, 3-7% of expanding agent, 2-3% of high-performance underwater anti-dispersant and 0.1-0.3% of polycarboxylic acid high-performance water reducing agent;

the total of the raw materials of the component A is 100 percent;

the component B comprises the following raw materials in percentage by mass:

80-90% of rapid hardening cementing material, 4-10% of active admixture, 3-7% of expanding agent, 2-3% of high-performance underwater anti-dispersant, 0.1-0.3% of polycarboxylic acid high-performance water reducing agent, 0.1-0.2% of retarder, 0.1-0.2% of early strength admixture, 0.1-0.15% of thixotropic agent and 0.05-0.1% of interface wetting agent;

the total of the raw materials of the component B is 100 percent.

The mass ratio of the component A single liquid to the component B single liquid is (0.3-1): 1.

By dividing the grouting material into A, B two components, the single liquid prepared respectively can keep longer working time, can be prepared in advance, and saves time for grouting construction. A. And B, mixing the two component slurries according to the mass ratio of (0.3-1) to 1, and then setting and hardening the mixture quickly, wherein the initial setting time is 5-10min, and the final setting time is 10-15 min. The dual-component grouting mode effectively avoids the situations of pipe blockage and grouting equipment cleaning in the construction process, and the situation of reduced grouting efficiency in the skylight period is caused.

The cementing material of the component A is one or more of common portland cement with the strength grade of 42.5, 42.5R, 52.5 or 52.5R.

The quick-hardening cementing material of the component B is one or more of quick-hardening sulphoaluminate cements with the strength grades of 42.5 and 52.5. After the ordinary Portland cement in the component A and the quick-hardening sulphoaluminate cement in the component B are mixed according to a certain proportion, Ca (OH) is consumed by the quick-hardening sulphoaluminate cement₂The alkalinity of the cement is reduced, the hydration of calcium silicate in the ordinary Portland cement is accelerated, and simultaneously, the anhydrous calcium sulphoaluminate in the quick-hardening sulphoaluminate cement reacts with the gypsum to generate ettringite, so that the quick setting and even flash setting appear, and the early strength of the mixed slurry is obviously improved. By adjusting the mixing proportion of the A, B components, the promotion degree of hydration reaction can be controlled, and the setting time of the mixed slurry can be accurately regulated and controlled.

The active admixture in the component A and the component B is one or more of micro-bead powder, silica fume or anhydrite powder. The ball effect of the active admixture can improve the fluidity of the slurry, the high activity of the active admixture can improve the strength of a solidified body, and the anhydrous calcium sulfate in the anhydrite can also promote the cementing material to generate ettringite and accelerate the setting speed. Wherein the specific surface area of the micro-bead powder is not less than 900m²The activity index of/kg and 28d is not less than 90 percent, and SiO in the silica fume₂Content is not less than 85%, 28d activity index is not less than 85%, and anhydrite powder SO₃The content is not less than 48%.

The expanding agent in the component A and the component B is a mixture of a plastic expanding agent and a hardening period expanding agent, wherein the plastic expanding agent: the mass ratio of the swelling agent in the hardening period is 1-2: 100. the plastic expanding agent is azodicarbonamide, and the expanding agent in the hardening period is a magnesium oxide expanding agent with the activity reaction time of less than 300 s. The plastic expanding agent can enable the slurry to generate a large number of uniform micropores when not hardened, and expansion pressure is formed in rock stratum gaps and dead corners of a grouting area, so that the grouting compactness is improved. After the grouting slurry is hardened, the magnesium oxide expanding agent can enable the concretion body to continuously generate micro expansion in a long age period, and the later shrinkage of the cement-based grouting material is compensated.

The high-performance underwater anti-dispersing agent in the component A and the component B is a mixture compounded by hydroxypropyl methyl cellulose ether, polyacrylamide, polyvinyl alcohol and zeolite powder, and the mass ratio of the hydroxypropyl methyl cellulose ether to the zeolite powder is as follows: polyacrylamide: polyvinyl alcohol: and (2) zeolite powder is 15-20: 5-10: 5-10: 100. the anti-dispersing agent mainly plays a role in improving the underwater anti-dispersion performance of the grouting material, the freshly mixed grouting slurry can be regarded as a dispersion system with solid-phase particles of a double electric layer on the surface, the anti-dispersing agent with charges after hydrolysis can perform a neutralization reaction with cement particles and change the potential on the surfaces of the cement particles, the repulsion on the surfaces of the cement particles is reduced, the distance between the cement particles is reduced, the attraction potential energy between the anti-dispersing agent and the cement particles is also increased due to the charge neutralization effect, and the anti-dispersing agent and the cement particles form a stable flocculating constituent under the action of Van der Waals force. Polyacrylamide and hydroxypropyl methylcellulose ether are both organic high molecular compounds having a long chain structure, and the long chain has a large number of functional groups, which can adsorb a large number of cement particles, which can form aggregates and exist stably. The adhesive polyvinyl alcohol with high polymerization degree and hydrophilic cellulose ether have good adhesive force, and the flocculation effect can be optimized; the zeolite powder has a porous structure and strong adsorbability, can increase the cohesive force of cement slurry and prevent the slurry from being washed and dispersed by water in underwater operation, and contains a certain amount of active silicon dioxide and silicon trioxide, and can react with hydration products of cement calcium hydroxide to generate gelled substances. The viscosity specification of the hydroxypropyl methyl cellulose ether used in the anti-dispersing agent is 4-20 ten thousand, the molecular weight of polyacrylamide is 800-2000 ten thousand, and the polyvinyl alcohol is high-polymerization-degree polyvinyl alcohol with the molecular weight of 17-22 ten thousand. The compounded high-performance underwater anti-dispersing agent has excellent anti-dispersion performance and small conflict with the deflocculation effect of the water reducing agent.

The water reducing rate of the polycarboxylic acid high-performance water reducing agent in the component A and the component B is not less than 20%.

The retarder in the component B is one or more of sodium gluconate, tartaric acid, boric acid or citric acid. The set retarder can adjust the set time of the A, B components so that the slurry made of the two components has sufficient workable time before mixing.

The early strength agent in the component B is one or more of lithium carbonate or lithium chloride. The early strength agent can accelerate the hydration speed of cement, promote the development of early strength of a consolidation body after A, B components are mixed, has no obvious influence on later strength, has an early strength function and also has a certain water reducing function.

The thixotropic agent in the component B is one or more of magnesium aluminum silicate, polyamide wax, metakaolin or sodium bentonite. The thixotropic agent can improve the thixotropy of the paste and improve the self-leveling and self-compacting characteristics of the paste. During stirring and grouting, the thixotropic agent can improve the flowing property of the slurry, when grouting is stopped, the thixotropic agent is excited by alkali or sulfate, the thixotropic agent can promote the silicon-aluminum compound to be converted into a polymerized state from depolymerization under the condition that the slurry is not disturbed, an aluminosilicate network structure similar to some natural minerals in the earth crust can be formed, and the early strength is improved.

The interface sizing agent in the component B is one or more of vinyl triethoxysilane or isobutyl triethoxysilane. The interface impregnating compound can support a 'molecular bridge' between the interfaces of inorganic substances and organic substances, and connects two materials with different properties together, thereby improving the composite bonding strength of the high-performance underwater anti-dispersant and cement-based materials.

The preparation method of the two-component grouting liquid comprises the following steps:

1) preparation of a component A: after the gelling material, the active admixture, the expanding agent and the high-performance underwater anti-dispersant in the component A are stirred and mixed, the polycarboxylic acid high-performance water reducing agent in the formula amount is added, stirred and mixed uniformly, and the component A is obtained;

2) b, preparation of a component: and (3) stirring and mixing the quick-hardening cementing material, the active admixture, the expanding agent and the high-performance underwater anti-dispersant in the formula amount in the component B, and then adding the rest material in the formula amount in the component B, and stirring and mixing uniformly to obtain the component B.

3) When the prepared component A and the component B are added with water and stirred, the mass ratio of water to material is (0.25-0.28): 1, respectively obtaining the component A single liquid and the component B single liquid.

The preferred preparation method is as follows:

1) preparation of a component A: stirring the gelling material, the active admixture, the expanding agent and the high-performance underwater anti-dispersant in the component A for 5-10min by using a mixer, and then adding the polycarboxylic acid high-performance water reducing agent in the formula amount and stirring for 5min to obtain the component A;

2) b, preparation of a component: and (3) stirring the quick-hardening cementing material, the active admixture, the expanding agent and the high-performance underwater anti-dispersant in the formula amount in the component B for 5-10min by using a mixer, then adding the rest material in the formula amount in the component B, and continuously stirring for 5min to obtain the component B.

3) When the prepared component A and the component B are added with water and stirred, the mass ratio of water to material is (0.25-0.28): 1, respectively obtaining the component A single liquid and the component B single liquid.

The cementing materials of the two components are respectively ordinary Portland cement and quick-hardening sulphoaluminate cement, are cement-based materials, and are different from the conventional organic high polymer grouting material and cement-water glass double-liquid grouting material. The slurry prepared by the two components is doped with the high-performance underwater anti-dispersing agent, so that the slurry is not dispersed during underwater grouting, and the construction in a water seepage area of a tunnel is not influenced. The prepared slurry is doped with a retarder, the workable time is 1-1.5 h, and the workable time of the slurry can be adjusted by adjusting the doping amount of the retarder according to the specific construction schedule. Therefore, the grouting material can be prepared before grouting construction, and time is saved for rapid repair construction operation. After mixing, because the cement systems of the two slurries are different, hydration reaction hardening and coagulation can be rapidly generated after mixing, and the requirement of rapid first-aid repair is met. Meanwhile, the hardening and setting speed of the mixed slurry can be adjusted in real time by adjusting the grouting proportion of the two slurries.

The two-component grouting liquid is a cement-based material, is easy to construct, has low material cost, is stably combined with an inorganic concrete interface, has good aging resistance, and is safe, nontoxic and pollution-free compared with an organic high polymer grouting material.

The two-component grouting liquid A, B has the advantages of fast setting and hardening after mixing, more flexible two-component grouting mode, high grouting construction efficiency, difficult pipe blockage and capability of adjusting the grouting proportion of A, B components according to the site construction requirements so as to accurately adjust the setting time. Before mixing, the initial setting time of the two kinds of slurry prepared by the A, B components is longer, the initial setting time of the slurry after mixing is 5-10min, the working time of the slurry after mixing is 5-10min, the final setting time is less than or equal to 15min, the content of suspended matters is less than or equal to 100mg/L, and the working time and the setting time of the slurry after mixing can be regulated and controlled in a wider range by further regulating the proportion of the A, B components.

The two-component grouting liquid is high in strength of a solidified body. The strength of the organic high polymer grouting material is generally within 1MPa in the period of rush repair of the railway tunnel road bed skylight, the strength of the cement-water glass double-liquid grouting material can only reach within 3MPa, the grouting material has extremely high strength through the designed raw materials and proportion, the 30-min compressive strength is more than or equal to 15MPa, the 3-d compressive strength is more than or equal to 30MPa, and the driving conditions after rush repair of the railway tunnel skylight are completely met.

The grouting material has good underwater anti-dispersion property, the prepared slurry is not easy to be dispersed in the underwater grouting process, and the effect of draining and filling densely can be achieved in a cavity area. The compressive strength ratio of the land and the water in 30min is more than or equal to 80 percent, and the compressive strength ratio of the land and the water in 3d is more than or equal to 85 percent.

The invention uses the pulse grouting machine for grouting, and because the A, B component prepared cement-based underwater dispersion-resistant rapid hardening grouting slurry is added with the flocculating material for improving the underwater dispersion resistance of the slurry, the slurry has larger cohesiveness and larger grouting resistance than the common cement slurry, the creeping grouting machine is difficult to accurately control the proportion of A, B components, and the screw grouting machine is easy to generate heat when the grouting friction resistance is large, thereby causing the rapid hardening pump plugging of the slurry. The pulse grouting machine can realize that two single liquids of A, B components alternately enter mixing equipment by controlling high-low pressure peak staggering while controlling the grouting speed, and equivalently, the slurry is premixed in advance.

Because A, B components are cement-based materials, and the setting hardening speed is very fast after mixing, other mixed mode efficiency is lower and be difficult to the clearance, influences the efficiency of construction. The single liquid enters the mixing pipe under the pressure of the pressure device, the flow guide damping fins in different directions in the mixing pipe are impacted in the flowing process, the grouting liquid forms three-dimensional unsteady and irregular turbulence with rotation in the mixing pipe, severe vortex can be generated in the section direction, and strong shearing force acts on the grouting liquid to enable the single liquid to be uniformly mixed in the flowing process. Adopt the detachable hybrid tube to carry out the thick liquid and mix, can the efficient carry out A, B component and mix, make things convenient for the clearance after slip casting in-process stifled pipe dredges and the slip casting is ended simultaneously. And the vibrator sleeved outside the mixing pipe can further disperse the mixed slurry through high-frequency vibration, and the slurry is not easy to adhere to the wall of the mixing pipe under the high-frequency vibration, so that the grouting resistance is reduced, and the grouting efficiency is improved.

By adopting the A, B component single liquid, the workable time of the A component single liquid of the cement-based underwater anti-dispersion grouting material is more than or equal to 1h, and the workable time of the B component single liquid of the cement-based rapid hardening excitation material is more than or equal to 1 h. Therefore, the slurry can be prepared in advance, and the two components are mixed before grouting, so that the construction is more flexible and rapid. The A, B component has the advantages that the single liquid can be quickly hardened only when the two liquids are mixed, the hydration reaction of the slurry in the preparation period is reduced, and the condition that the construction progress is influenced by pipe blockage caused by too fast coagulation of the mixed slurry can be effectively avoided.

In the A, B component, the underwater anti-dispersion agent increases the underwater anti-dispersion property of the slurry, the water reducing agent improves the fluidity of the slurry, the rapid hardening and excitation cementing material can be rapidly solidified and hardened after being mixed with the cementing material of the A component so as to meet the requirement of rapid repair, and the retarder ensures the working time of the slurry prepared by the B component.

And further, stopping the machine after grouting is finished, observing the slurry falling condition, and supplementing slurry if the slurry falls.

Compared with the prior art, the gain effect of the invention is as follows:

the single-liquid component can work for a long time, after double liquids are mixed, the underwater anti-dispersion property is good, the condensation hardening speed is high, the requirement of underwater rapid repair of a railway tunnel foundation void area is met, and the construction cannot be influenced by the fact that pipes are blocked due to the fact that the condensation speed is too high in double-liquid grouting.

Secondly, the invention adopts a mode of grouting a little in the middle area of the quincuncial pile-shaped arranged grouting holes, the grouting is compact without dead angle, the grouting effect is good, the grouting pressure is small, the efficiency is high, and the bin is not easy to block under the condition of higher coagulation speed of mixed grout.

Third, the invention uses the high-low pressure peak-shifting grouting of the pulse grouting machine to realize premixing, the mixing pipe is mixed for the second time, the vibrator is deeply mixed for the third time, the grouting speed is controllable, and the mixing efficiency and the uniformity are improved under the conditions of good underwater anti-dispersion property and high cohesiveness of the slurry.

The two-component grouting material is a cement-based material, has high strength, low cost, stable interface combination and good durability, and the working time of the mixed grout can be adjusted by controlling the proportion of the component A and the component B.

Drawings

FIG. 1 is a diagram of a pulsed grouting machine;

in the figure: 1-a pressure device, 2-a storage tank, 3-a flow control valve, 4-a pipeline, 5-a control component, 6-a grouting gun head, 7-a mixing pipe, 8-a vibrator, 9-a motor frequency modulator and 10-a mixed slurry grouting pipe;

FIG. 2 is a cross-sectional view of the interior of the mixing tube, 7-mixing tube, 11-guide damping fin.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings. The embodiment is implemented on the premise of the technical scheme of the invention, and a detailed implementation manner and a specific operation process are given, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiment of the invention belong to the protection scope of the invention.